page%swap@Sun.COM (Bob Page) (11/19/89)
Submitted-by: rsbx@cbmvax.commodore.com (Raymond S. Brand)
Posting-number: Volume 89, Issue 217
Archive-name: unix/rcs.02
# This is a shell archive.
# Remove anything above and including the cut line.
# Then run the rest of the file through 'sh'.
# Unpacked files will be owned by you and have default permissions.
#----cut here-----cut here-----cut here-----cut here----#
#!/bin/sh
# shar: SHell ARchive
# Run the following text through 'sh' to create:
# diff/analyze.c
# diff/context.c
# diff/diff.c
# diff/diff3.c
# This is archive 2 of a 14-part kit.
# This archive created: Sun Nov 19 01:12:04 1989
if `test ! -d diff`
then
mkdir diff
echo "mkdir diff"
fi
echo "extracting diff/analyze.c"
sed 's/^X//' << \SHAR_EOF > diff/analyze.c
X/* Analyze file differences for GNU DIFF.
X Copyright (C) 1988, 1989 Free Software Foundation, Inc.
X
XThis file is part of GNU DIFF.
X
XGNU DIFF is free software; you can redistribute it and/or modify
Xit under the terms of the GNU General Public License as published by
Xthe Free Software Foundation; either version 1, or (at your option)
Xany later version.
X
XGNU DIFF is distributed in the hope that it will be useful,
Xbut WITHOUT ANY WARRANTY; without even the implied warranty of
XMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
XGNU General Public License for more details.
X
XYou should have received a copy of the GNU General Public License
Xalong with GNU DIFF; see the file COPYING. If not, write to
Xthe Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
X
X/* The basic algorithm is described in:
X "An O(ND) Difference Algorithm and its Variations", Eugene Myers,
X Algorithmica Vol. 1 No. 2, 1986, p 251. */
X
X#include "regex.h"
X#include "diff.h"
X
Xextern int no_discards;
X
Xstatic int *xvec, *yvec; /* Vectors being compared. */
Xstatic int *fdiag; /* Vector, indexed by diagonal, containing
X the X coordinate of the point furthest
X along the given diagonal in the forward
X search of the edit matrix. */
Xstatic int *bdiag; /* Vector, indexed by diagonal, containing
X the X coordinate of the point furthest
X along the given diagonal in the backward
X search of the edit matrix. */
X
X/* Find the midpoint of the shortest edit script for a specified
X portion of the two files.
X
X We scan from the beginnings of the files, and simultaneously from the ends,
X doing a breadth-first search through the space of edit-sequence.
X When the two searches meet, we have found the midpoint of the shortest
X edit sequence.
X
X The value returned is the number of the diagonal on which the midpoint lies.
X The diagonal number equals the number of inserted lines minus the number
X of deleted lines (counting only lines before the midpoint).
X The edit cost is stored into *COST; this is the total number of
X lines inserted or deleted (counting only lines before the midpoint).
X
X This function assumes that the first lines of the specified portions
X of the two files do not match, and likewise that the last lines do not
X match. The caller must trim matching lines from the beginning and end
X of the portions it is going to specify.
X
X Note that if we return the "wrong" diagonal value, or if
X the value of bdiag at that diagonal is "wrong",
X the worst this can do is cause suboptimal diff output.
X It cannot cause incorrect diff output. */
X
Xstatic int
Xdiag (xoff, xlim, yoff, ylim, cost)
X int xoff, xlim, yoff, ylim;
X int *cost;
X{
X int *const fd = fdiag; /* Give the compiler a chance. */
X int *const bd = bdiag; /* Additional help for the compiler. */
X int *const xv = xvec; /* Still more help for the comiler. */
X int *const yv = yvec; /* And more and more . . . */
X const int dmin = xoff - ylim; /* Minimum valid diagonal. */
X const int dmax = xlim - yoff; /* Maximum valid diagonal. */
X const int fmid = xoff - yoff; /* Center diagonal of top-down search. */
X const int bmid = xlim - ylim; /* Center diagonal of bottom-up search. */
X int fmin = fmid, fmax = fmid; /* Limits of top-down search. */
X int bmin = bmid, bmax = bmid; /* Limits of bottom-up search. */
X int c; /* Cost. */
X int odd = fmid - bmid & 1; /* True if southeast corner is on an odd
X diagonal with respect to the northwest. */
X
X fd[fmid] = xoff;
X bd[bmid] = xlim;
X
X for (c = 1;; ++c)
X {
X int d; /* Active diagonal. */
X int big_snake = 0;
X
X /* Extend the top-down search by an edit step in each diagonal. */
X fmin > dmin ? fd[--fmin - 1] = -1 : ++fmin;
X fmax < dmax ? fd[++fmax + 1] = -1 : --fmax;
X for (d = fmax; d >= fmin; d -= 2)
X {
X int x, y, oldx, tlo = fd[d - 1], thi = fd[d + 1];
X
X if (tlo >= thi)
X x = tlo + 1;
X else
X x = thi;
X oldx = x;
X y = x - d;
X while (x < xlim && y < ylim && xv[x] == yv[y])
X ++x, ++y;
X if (x - oldx > 20)
X big_snake = 1;
X fd[d] = x;
X if (odd && bmin <= d && d <= bmax && bd[d] <= fd[d])
X {
X *cost = 2 * c - 1;
X return d;
X }
X }
X
X /* Similar extend the bottom-up search. */
X bmin > dmin ? bd[--bmin - 1] = INT_MAX : ++bmin;
X bmax < dmax ? bd[++bmax + 1] = INT_MAX : --bmax;
X for (d = bmax; d >= bmin; d -= 2)
X {
X int x, y, oldx, tlo = bd[d - 1], thi = bd[d + 1];
X
X if (tlo < thi)
X x = tlo;
X else
X x = thi - 1;
X oldx = x;
X y = x - d;
X while (x > xoff && y > yoff && xv[x - 1] == yv[y - 1])
X --x, --y;
X if (oldx - x > 20)
X big_snake = 1;
X bd[d] = x;
X if (!odd && fmin <= d && d <= fmax && bd[d] <= fd[d])
X {
X *cost = 2 * c;
X return d;
X }
X }
X
X /* Heuristic: check occasionally for a diagonal that has made
X lots of progress compared with the edit distance.
X If we have any such, find the one that has made the most
X progress and return it as if it had succeeded.
X
X With this heuristic, for files with a constant small density
X of changes, the algorithm is linear in the file size. */
X
X if (c > 200 && big_snake && heuristic)
X {
X int best;
X int bestpos;
X
X best = 0;
X for (d = fmax; d >= fmin; d -= 2)
X {
X int dd = d - fmid;
X if ((fd[d] - xoff)*2 - dd > 12 * (c + (dd > 0 ? dd : -dd)))
X {
X if (fd[d] * 2 - dd > best
X && fd[d] - xoff > 20
X && fd[d] - d - yoff > 20)
X {
X int k;
X int x = fd[d];
X
X /* We have a good enough best diagonal;
X now insist that it end with a significant snake. */
X for (k = 1; k <= 20; k++)
X if (xvec[x - k] != yvec[x - d - k])
X break;
X
X if (k == 21)
X {
X best = fd[d] * 2 - dd;
X bestpos = d;
X }
X }
X }
X }
X if (best > 0)
X {
X *cost = 2 * c - 1;
X return bestpos;
X }
X
X best = 0;
X for (d = bmax; d >= bmin; d -= 2)
X {
X int dd = d - bmid;
X if ((xlim - bd[d])*2 + dd > 12 * (c + (dd > 0 ? dd : -dd)))
X {
X if ((xlim - bd[d]) * 2 + dd > best
X && xlim - bd[d] > 20
X && ylim - (bd[d] - d) > 20)
X {
X /* We have a good enough best diagonal;
X now insist that it end with a significant snake. */
X int k;
X int x = bd[d];
X
X for (k = 0; k < 20; k++)
X if (xvec[x + k] != yvec[x - d + k])
X break;
X if (k == 20)
X {
X best = (xlim - bd[d]) * 2 + dd;
X bestpos = d;
X }
X }
X }
X }
X if (best > 0)
X {
X *cost = 2 * c - 1;
X return bestpos;
X }
X }
X }
X}
X
X/* Compare in detail contiguous subsequences of the two files
X which are known, as a whole, to match each other.
X
X The results are recorded in the vectors files[N].changed_flag, by
X storing a 1 in the element for each line that is an insertion or deletion.
X
X The subsequence of file 0 is [XOFF, XLIM) and likewise for file 1.
X
X Note that XLIM, YLIM are exclusive bounds.
X All line numbers are origin-0 and discarded lines are not counted. */
X
Xstatic void
Xcompareseq (xoff, xlim, yoff, ylim)
X int xoff, xlim, yoff, ylim;
X{
X /* Slide down the bottom initial diagonal. */
X while (xoff < xlim && yoff < ylim && xvec[xoff] == yvec[yoff])
X ++xoff, ++yoff;
X /* Slide up the top initial diagonal. */
X while (xlim > xoff && ylim > yoff && xvec[xlim - 1] == yvec[ylim - 1])
X --xlim, --ylim;
X
X /* Handle simple cases. */
X if (xoff == xlim)
X while (yoff < ylim)
X files[1].changed_flag[files[1].realindexes[yoff++]] = 1;
X else if (yoff == ylim)
X while (xoff < xlim)
X files[0].changed_flag[files[0].realindexes[xoff++]] = 1;
X else
X {
X int c, d, f, b;
X
X /* Find a point of correspondence in the middle of the files. */
X
X d = diag (xoff, xlim, yoff, ylim, &c);
X f = fdiag[d];
X b = bdiag[d];
X
X if (c == 1)
X {
X /* This should be impossible, because it implies that
X one of the two subsequences is empty,
X and that case was handled above without calling `diag'.
X Let's verify that this is true. */
X abort ();
X#if 0
X /* The two subsequences differ by a single insert or delete;
X record it and we are done. */
X if (d < xoff - yoff)
X files[1].changed_flag[files[1].realindexes[b - d - 1]] = 1;
X else
X files[0].changed_flag[files[0].realindexes[b]] = 1;
X#endif
X }
X else
X {
X /* Use that point to split this problem into two subproblems. */
X compareseq (xoff, b, yoff, b - d);
X /* This used to use f instead of b,
X but that is incorrect!
X It is not necessarily the case that diagonal d
X has a snake from b to f. */
X compareseq (b, xlim, b - d, ylim);
X }
X }
X}
X
X/* Discard lines from one file that have no matches in the other file.
X
X A line which is discarded will not be considered by the actual
X comparison algorithm; it will be as if that line were not in the file.
X The file's `realindexes' table maps virtual line numbers
X (which don't count the discarded lines) into real line numbers;
X this is how the actual comparison algorithm produces results
X that are comprehensible when the discarded lines are counted.
X
X When we discard a line, we also mark it as a deletion or insertion
X so that it will be printed in the output. */
X
Xvoid
Xdiscard_confusing_lines (filevec)
X struct file_data filevec[];
X{
X int f, i, j;
X char *discarded[2];
X int *equiv_count[2];
X
X /* Allocate our results. */
X for (f = 0; f < 2; f++)
X {
X filevec[f].undiscarded
X = (int *) xmalloc (filevec[f].buffered_lines * sizeof (int));
X filevec[f].realindexes
X = (int *) xmalloc (filevec[f].buffered_lines * sizeof (int));
X }
X
X /* Set up equiv_count[F][I] as the number of lines in file F
X that fall in equivalence class I. */
X
X equiv_count[0] = (int *) xmalloc (filevec[0].equiv_max * sizeof (int));
X bzero (equiv_count[0], filevec[0].equiv_max * sizeof (int));
X equiv_count[1] = (int *) xmalloc (filevec[1].equiv_max * sizeof (int));
X bzero (equiv_count[1], filevec[1].equiv_max * sizeof (int));
X
X for (i = 0; i < filevec[0].buffered_lines; ++i)
X ++equiv_count[0][filevec[0].equivs[i]];
X for (i = 0; i < filevec[1].buffered_lines; ++i)
X ++equiv_count[1][filevec[1].equivs[i]];
X
X /* Set up tables of which lines are going to be discarded. */
X
X discarded[0] = (char *) xmalloc (filevec[0].buffered_lines);
X discarded[1] = (char *) xmalloc (filevec[1].buffered_lines);
X bzero (discarded[0], filevec[0].buffered_lines);
X bzero (discarded[1], filevec[1].buffered_lines);
X
X /* Mark to be discarded each line that matches no line of the other file.
X If a line matches many lines, mark it as provisionally discardable. */
X
X for (f = 0; f < 2; f++)
X {
X int end = filevec[f].buffered_lines;
X char *discards = discarded[f];
X int *counts = equiv_count[1 - f];
X int *equivs = filevec[f].equivs;
X for (i = 0; i < end; i++)
X {
X int nmatch = counts[equivs[i]];
X if (equivs[i] == 0)
X continue;
X if (nmatch == 0)
X discards[i] = 1;
X else if (nmatch > 5)
X discards[i] = 2;
X }
X }
X
X /* Don't really discard the provisional lines if there are less than ten
X discardable lines in a row. */
X
X for (f = 0; f < 2; f++)
X {
X int end = filevec[f].buffered_lines;
X char *discards = discarded[f];
X
X for (i = 0; i < end; i++)
X if (discards[i])
X {
X register int j;
X int length;
X int provisional = 0;
X
X /* Cancel provisional discards at the beginning. */
X while (i < end && discards[i] == 2)
X discards[i] = 0;
X
X /* Find end of this run of discardable lines.
X Count how many are provisionally discardable. */
X for (j = i; j < end; j++)
X {
X if (discards[j] == 0)
X break;
X if (discards[j] == 2)
X ++provisional;
X }
X
X /* Cancel provisional discards at the end, and shrink the run. */
X while (j > i && discards[j - 1] == 2)
X discards[j - 1] = 0, --provisional;
X
X /* Now we have the length of a run of discardable lines
X whose first and last are not provisional. */
X length = j - i;
X
X /* If half the lines in the run are provisional,
X cancel discarding of all provisional lines in the run. */
X if (provisional * 2 > length)
X {
X while (j > i)
X if (discards[--j] == 2)
X discards[j] = 0;
X }
X else
X {
X /* Cancel provisional discards that are near either end. */
X for (j = 0; j < 5 && j < length; j++)
X if (discards[i + j] == 2)
X discards[i + j] = 0;
X /* Meanwhile, I advances to the last line of the run. */
X i += length - 1;
X length -= 5;
X for (j = 0; j < 5 && j < length; j++)
X if (discards[i - j] == 2)
X discards[i - j] = 0;
X }
X }
X }
X
X /* Discard from file 0. */
X for (f = 0; f < 2; f++)
X {
X char *discards = discarded[f];
X int end = filevec[f].buffered_lines;
X j = 0;
X for (i = 0; i < end; ++i)
X if (no_discards || discards[i] == 0)
X {
X filevec[f].undiscarded[j] = filevec[f].equivs[i];
X filevec[f].realindexes[j++] = i;
X }
X else
X filevec[f].changed_flag[i] = 1;
X filevec[f].nondiscarded_lines = j;
X }
X
X free (discarded[1]);
X free (discarded[0]);
X free (equiv_count[1]);
X free (equiv_count[0]);
X}
X
X/* Adjust inserts/deletes of blank lines to join changes
X as much as possible.
X
X We do something when a run of changed lines include a blank
X line at one end and have an excluded blank line at the other.
X We are free to choose which blank line is included.
X `compareseq' always chooses the one at the beginning,
X but usually it is cleaner to consider the following blank line
X to be the "change". The only exception is if the preceding blank line
X would join this change to other changes. */
X
Xint inhibit;
X
Xstatic void
Xshift_boundaries (filevec)
X struct file_data filevec[];
X{
X int f;
X
X if (inhibit)
X return;
X
X for (f = 0; f < 2; f++)
X {
X char *changed = filevec[f].changed_flag;
X char *other_changed = filevec[1-f].changed_flag;
X int i = 0;
X int j = 0;
X int i_end = filevec[f].buffered_lines;
X int preceeding = -1;
X int other_preceeding = -1;
X
X while (1)
X {
X int start, end, other_start;
X
X /* Scan forwards to find beginning of another run of changes.
X Also keep track of the corresponding point in the other file. */
X
X while (i < i_end && changed[i] == 0)
X {
X while (other_changed[j++])
X /* Non-corresponding lines in the other file
X will count as the preceeding batch of changes. */
X other_preceeding = j;
X i++;
X }
X
X if (i == i_end)
X break;
X
X start = i;
X other_start = j;
X
X while (1)
X {
X /* Now find the end of this run of changes. */
X
X while (i < i_end && changed[i] != 0) i++;
X end = i;
X
X /* If the first changed line matches the following unchanged one,
X and this run does not follow right after a previous run,
X and there are no lines deleted from the other file here,
X then classify the first changed line as unchanged
X and the following line as changed in its place. */
X
X /* You might ask, how could this run follow right after another?
X Only because the previous run was shifted here. */
X
X if (files[f].equivs[start] == files[f].equivs[end]
X && !other_changed[j]
X && end != i_end
X && !((preceeding >= 0 && start == preceeding)
X || (other_preceeding >= 0
X && other_start == other_preceeding)))
X {
X changed[end++] = 1;
X changed[start++] = 0;
X ++i;
X /* Since one line-that-matches is now before this run
X instead of after, we must advance in the other file
X to keep in synch. */
X ++j;
X }
X else
X break;
X }
X
X preceeding = i;
X other_preceeding = j;
X }
X }
X}
X
X/* Cons an additional entry onto the front of an edit script OLD.
X LINE0 and LINE1 are the first affected lines in the two files (origin 0).
X DELETED is the number of lines deleted here from file 0.
X INSERTED is the number of lines inserted here in file 1.
X
X If DELETED is 0 then LINE0 is the number of the line before
X which the insertion was done; vice versa for INSERTED and LINE1. */
X
Xstatic struct change *
Xadd_change (line0, line1, deleted, inserted, old)
X int line0, line1, deleted, inserted;
X struct change *old;
X{
X struct change *new = (struct change *) xmalloc (sizeof (struct change));
X
X new->line0 = line0;
X new->line1 = line1;
X new->inserted = inserted;
X new->deleted = deleted;
X new->link = old;
X return new;
X}
X
X/* Scan the tables of which lines are inserted and deleted,
X producing an edit script in reverse order. */
X
Xstatic struct change *
Xbuild_reverse_script (filevec)
X struct file_data filevec[];
X{
X struct change *script = 0;
X char *changed0 = filevec[0].changed_flag;
X char *changed1 = filevec[1].changed_flag;
X int len0 = filevec[0].buffered_lines;
X int len1 = filevec[1].buffered_lines;
X
X /* Note that changedN[len0] does exist, and contains 0. */
X
X int i0 = 0, i1 = 0;
X
X while (i0 < len0 || i1 < len1)
X {
X if (changed0[i0] || changed1[i1])
X {
X int line0 = i0, line1 = i1;
X
X /* Find # lines changed here in each file. */
X while (changed0[i0]) ++i0;
X while (changed1[i1]) ++i1;
X
X /* Record this change. */
X script = add_change (line0, line1, i0 - line0, i1 - line1, script);
X }
X
X /* We have reached lines in the two files that match each other. */
X i0++, i1++;
X }
X
X return script;
X}
X
X/* Scan the tables of which lines are inserted and deleted,
X producing an edit script in forward order. */
X
Xstatic struct change *
Xbuild_script (filevec)
X struct file_data filevec[];
X{
X struct change *script = 0;
X char *changed0 = filevec[0].changed_flag;
X char *changed1 = filevec[1].changed_flag;
X int len0 = filevec[0].buffered_lines;
X int len1 = filevec[1].buffered_lines;
X
X /* Note that changedN[-1] does exist, and contains 0. */
X
X int i0 = len0, i1 = len1;
X
X while (i0 >= 0 || i1 >= 0)
X {
X if (changed0[i0 - 1] || changed1[i1 - 1])
X {
X int line0 = i0, line1 = i1;
X
X /* Find # lines changed here in each file. */
X while (changed0[i0 - 1]) --i0;
X while (changed1[i1 - 1]) --i1;
X
X /* Record this change. */
X script = add_change (i0, i1, line0 - i0, line1 - i1, script);
X }
X
X /* We have reached lines in the two files that match each other. */
X i0--, i1--;
X }
X
X return script;
X}
X
X/* Report the differences of two files. DEPTH is the current directory
X depth. */
Xint
Xdiff_2_files (filevec, depth)
X struct file_data filevec[];
X int depth;
X{
X int diags;
X int i;
X struct change *e, *p;
X struct change *script;
X int binary;
X
X /* See if the two named files are actually the same physical file.
X If so, we know they are identical without actually reading them. */
X
X#ifndef AMIGA
X if (filevec[0].stat.st_ino == filevec[1].stat.st_ino
X && filevec[0].stat.st_dev == filevec[1].stat.st_dev)
X return 0;
X#endif
X
X binary = read_files (filevec);
X
X /* If we have detected that file 0 is a binary file,
X compare the two files as binary. This can happen
X only when the first chunk is read. */
X
X if (binary)
X {
X int differs = (filevec[0].buffered_chars != filevec[1].buffered_chars
X || bcmp (filevec[0].buffer, filevec[1].buffer,
X filevec[1].buffered_chars));
X if (differs)
X message ("Binary files %s and %s differ\n",
X filevec[0].name, filevec[1].name);
X
X for (i = 0; i < 2; ++i)
X if (filevec[i].buffer)
X free (filevec[i].buffer);
X return differs;
X }
X
X if (filevec[0].missing_newline != filevec[1].missing_newline)
X {
X if (filevec[0].missing_newline)
X error ("No newline at end of file %s\n", filevec[0].name);
X if (filevec[1].missing_newline)
X error ("No newline at end of file %s\n", filevec[1].name);
X }
X
X /* Allocate vectors for the results of comparison:
X a flag for each line of each file, saying whether that line
X is an insertion or deletion.
X Allocate an extra element, always zero, at each end of each vector. */
X
X filevec[0].changed_flag = (char *) xmalloc (filevec[0].buffered_lines + 2);
X filevec[1].changed_flag = (char *) xmalloc (filevec[1].buffered_lines + 2);
X bzero (filevec[0].changed_flag, filevec[0].buffered_lines + 2);
X bzero (filevec[1].changed_flag, filevec[1].buffered_lines + 2);
X filevec[0].changed_flag++;
X filevec[1].changed_flag++;
X
X /* Some lines are obviously insertions or deletions
X because they don't match anything. Detect them now,
X and avoid even thinking about them in the main comparison algorithm. */
X
X discard_confusing_lines (filevec);
X
X /* Now do the main comparison algorithm, considering just the
X undiscarded lines. */
X
X xvec = filevec[0].undiscarded;
X yvec = filevec[1].undiscarded;
X diags = filevec[0].nondiscarded_lines + filevec[1].nondiscarded_lines + 3;
X fdiag = (int *) xmalloc (diags * sizeof (int));
X fdiag += filevec[1].nondiscarded_lines + 1;
X bdiag = (int *) xmalloc (diags * sizeof (int));
X bdiag += filevec[1].nondiscarded_lines + 1;
X
X files[0] = filevec[0];
X files[1] = filevec[1];
X
X compareseq (0, filevec[0].nondiscarded_lines,
X 0, filevec[1].nondiscarded_lines);
X
X bdiag -= filevec[1].nondiscarded_lines + 1;
X free (bdiag);
X fdiag -= filevec[1].nondiscarded_lines + 1;
X free (fdiag);
X
X /* Modify the results slightly to make them prettier
X in cases where that can validly be done. */
X
X shift_boundaries (filevec);
X
X /* Get the results of comparison in the form of a chain
X of `struct change's -- an edit script. */
X
X if (output_style == OUTPUT_ED)
X script = build_reverse_script (filevec);
X else
X script = build_script (filevec);
X
X if (script)
X {
X setup_output (files[0].name, files[1].name, depth);
X if (output_style == OUTPUT_CONTEXT)
X print_context_header (files);
X
X switch (output_style)
X {
X case OUTPUT_CONTEXT:
X print_context_script (script);
X break;
X
X case OUTPUT_ED:
X print_ed_script (script);
X break;
X
X case OUTPUT_FORWARD_ED:
X pr_forward_ed_script (script);
X break;
X
X case OUTPUT_RCS:
X print_rcs_script (script);
X break;
X
X case OUTPUT_NORMAL:
X print_normal_script (script);
X break;
X }
X
X finish_output ();
X }
X
X for (i = 1; i >= 0; --i)
X {
X free (filevec[i].realindexes);
X free (filevec[i].undiscarded);
X }
X
X for (i = 1; i >= 0; --i)
X free (--filevec[i].changed_flag);
X
X for (i = 1; i >= 0; --i)
X free (filevec[i].equivs);
X
X for (i = 0; i < 2; ++i)
X {
X if (filevec[i].buffer != 0)
X free (filevec[i].buffer);
X free (filevec[i].linbuf);
X }
X
X for (e = script; e; e = p)
X {
X p = e->link;
X free (e);
X }
X
X return script ? 1 : 0;
X}
SHAR_EOF
echo "extracting diff/context.c"
sed 's/^X//' << \SHAR_EOF > diff/context.c
X/* Context-format output routines for GNU DIFF.
X Copyright (C) 1988, 1989 Free Software Foundation, Inc.
X
XThis file is part of GNU DIFF.
X
XGNU DIFF is free software; you can redistribute it and/or modify
Xit under the terms of the GNU General Public License as published by
Xthe Free Software Foundation; either version 1, or (at your option)
Xany later version.
X
XGNU DIFF is distributed in the hope that it will be useful,
Xbut WITHOUT ANY WARRANTY; without even the implied warranty of
XMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
XGNU General Public License for more details.
X
XYou should have received a copy of the GNU General Public License
Xalong with GNU DIFF; see the file COPYING. If not, write to
Xthe Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
X
X#include "diff.h"
X
Xstatic void pr_context_hunk ();
Xstatic struct change *find_hunk ();
Xstatic void mark_ignorable ();
Xstatic int find_function ();
X
X/* Last place find_function started searching from. */
Xstatic int find_function_last_search;
X
X/* The value find_function returned when it started searching there. */
Xstatic int find_function_last_match;
X
X/* Print a header for a context diff, with the file names and dates. */
X
Xvoid
Xprint_context_header (inf)
X struct file_data *inf;
X{
X fprintf (outfile, "*** %s\t%s", inf[0].name,
X ctime (&inf[0].stat.st_mtime));
X fprintf (outfile, "--- %s\t%s", inf[1].name,
X ctime (&inf[1].stat.st_mtime));
X}
X
X/* Print an edit script in context format. */
X
Xvoid
Xprint_context_script (script)
X struct change *script;
X{
X if (ignore_blank_lines_flag || ignore_regexp)
X mark_ignorable (script);
X else
X {
X struct change *e;
X for (e = script; e; e = e->link)
X e->ignore = 0;
X }
X
X find_function_last_search = 0;
X find_function_last_match = -1;
X
X print_script (script, find_hunk, pr_context_hunk);
X}
X
X/* Print a pair of line numbers with a comma, translated for file FILE.
X If the second number is smaller, use the first in place of it.
X
X Args A and B are internal line numbers.
X We print the translated (real) line numbers. */
X
Xstatic void
Xprint_context_number_range (file, a, b)
X struct file_data *file;
X int a, b;
X{
X int trans_a, trans_b;
X translate_range (file, a, b, &trans_a, &trans_b);
X
X /* Note: we can have B < A in the case of a range of no lines.
X In this case, we should print the line number before the range,
X which is B. */
X if (trans_b >= trans_a)
X fprintf (outfile, "%d,%d", trans_a, trans_b);
X else
X fprintf (outfile, "%d", trans_b);
X}
X
X/* Print a portion of an edit script in context format.
X HUNK is the beginning of the portion to be printed.
X The end is marked by a `link' that has been nulled out.
X
X Prints out lines from both files, and precedes each
X line with the appropriate flag-character. */
X
Xstatic void
Xpr_context_hunk (hunk)
X struct change *hunk;
X{
X int first0, last0, first1, last1, show_from, show_to, i;
X struct change *next;
X char *prefix;
X char *function;
X int function_length;
X
X /* Determine range of line numbers involved in each file. */
X
X analyze_hunk (hunk, &first0, &last0, &first1, &last1, &show_from, &show_to);
X
X if (!show_from && !show_to)
X return;
X
X /* Include a context's width before and after. */
X
X first0 = max (first0 - context, 0);
X first1 = max (first1 - context, 0);
X last0 = min (last0 + context, files[0].buffered_lines - 1);
X last1 = min (last1 + context, files[1].buffered_lines - 1);
X
X /* If desired, find the preceding function definition line in file 0. */
X function = 0;
X if (function_regexp)
X find_function (&files[0], first0, &function, &function_length);
X
X /* If we looked for and found a function this is part of,
X include its name in the header of the diff section. */
X fprintf (outfile, "***************");
X
X if (function)
X {
X fprintf (outfile, " ");
X fwrite (function, 1, min (function_length - 1, 40), outfile);
X }
X
X fprintf (outfile, "\n*** ");
X print_context_number_range (&files[0], first0, last0);
X fprintf (outfile, " ****\n");
X
X if (show_from)
X {
X next = hunk;
X
X for (i = first0; i <= last0; i++)
X {
X /* Skip past changes that apply (in file 0)
X only to lines before line I. */
X
X while (next && next->line0 + next->deleted <= i)
X next = next->link;
X
X /* Compute the marking for line I. */
X
X prefix = " ";
X if (next && next->line0 <= i)
X /* The change NEXT covers this line.
X If lines were inserted here in file 1, this is "changed".
X Otherwise it is "deleted". */
X prefix = (next->inserted > 0 ? "!" : "-");
X
X print_1_line (prefix, &files[0].linbuf[i]);
X }
X }
X
X fprintf (outfile, "--- ");
X print_context_number_range (&files[1], first1, last1);
X fprintf (outfile, " ----\n");
X
X if (show_to)
X {
X next = hunk;
X
X for (i = first1; i <= last1; i++)
X {
X /* Skip past changes that apply (in file 1)
X only to lines before line I. */
X
X while (next && next->line1 + next->inserted <= i)
X next = next->link;
X
X /* Compute the marking for line I. */
X
X prefix = " ";
X if (next && next->line1 <= i)
X /* The change NEXT covers this line.
X If lines were deleted here in file 0, this is "changed".
X Otherwise it is "inserted". */
X prefix = (next->deleted > 0 ? "!" : "+");
X
X print_1_line (prefix, &files[1].linbuf[i]);
X }
X }
X}
X
X/* Scan a (forward-ordered) edit script for the first place that at least
X 2*CONTEXT unchanged lines appear, and return a pointer
X to the `struct change' for the last change before those lines. */
X
Xstatic struct change *
Xfind_hunk (start)
X struct change *start;
X{
X struct change *prev;
X int top0, top1;
X int thresh;
X
X do
X {
X /* Computer number of first line in each file beyond this changed. */
X top0 = start->line0 + start->deleted;
X top1 = start->line1 + start->inserted;
X prev = start;
X start = start->link;
X /* Threshold distance is 2*CONTEXT between two non-ignorable changes,
X but only CONTEXT if one is ignorable. */
X thresh = ((prev->ignore || (start && start->ignore))
X ? context
X : 2 * context);
X /* It is not supposed to matter which file we check in the end-test.
X If it would matter, crash. */
X if (start && start->line0 - top0 != start->line1 - top1)
X abort ();
X } while (start
X /* Keep going if less than THRESH lines
X elapse before the affected line. */
X && start->line0 < top0 + thresh);
X
X return prev;
X}
X
X/* Set the `ignore' flag properly in each change in SCRIPT.
X It should be 1 if all the lines inserted or deleted in that change
X are ignorable lines. */
X
Xstatic void
Xmark_ignorable (script)
X struct change *script;
X{
X while (script)
X {
X struct change *next = script->link;
X int first0, last0, first1, last1, deletes, inserts;
X
X /* Turn this change into a hunk: detach it from the others. */
X script->link = 0;
X
X /* Determine whether this change is ignorable. */
X analyze_hunk (script, &first0, &last0, &first1, &last1, &deletes, &inserts);
X /* Reconnect the chain as before. */
X script->link = next;
X
X /* If the change is ignorable, mark it. */
X script->ignore = (!deletes && !inserts);
X
X /* Advance to the following change. */
X script = next;
X }
X}
X
X/* Find the last function-header line in FILE prior to line number LINENUM.
X This is a line containing a match for the regexp in `function_regexp'.
X Store the address of the line text into LINEP and the length of the
X line into LENP.
X Do not store anything if no function-header is found. */
X
Xstatic int
Xfind_function (file, linenum, linep, lenp)
X struct file_data *file;
X int linenum;
X char **linep;
X int *lenp;
X{
X int i = linenum;
X int last = find_function_last_search;
X find_function_last_search = i;
X
X while (--i >= last)
X {
X /* See if this line is what we want. */
X
X if (0 <= re_search (&function_regexp_compiled,
X files[0].linbuf[i].text,
X files[0].linbuf[i].length,
X 0, files[0].linbuf[i].length,
X 0))
X {
X *linep = files[0].linbuf[i].text;
X *lenp = files[0].linbuf[i].length;
X find_function_last_match = i;
X return 1;
X }
X }
X /* If we search back to where we started searching the previous time,
X find the line we found last time. */
X if (find_function_last_match >= 0)
X {
X i = find_function_last_match;
X *linep = files[0].linbuf[i].text;
X *lenp = files[0].linbuf[i].length;
X return 1;
X }
X return 0;
X}
SHAR_EOF
echo "extracting diff/diff.c"
sed 's/^X//' << \SHAR_EOF > diff/diff.c
X/* GNU DIFF main routine.
X Copyright (C) 1988, 1989 Free Software Foundation, Inc.
X
XThis file is part of GNU DIFF.
X
XGNU DIFF is free software; you can redistribute it and/or modify
Xit under the terms of the GNU General Public License as published by
Xthe Free Software Foundation; either version 1, or (at your option)
Xany later version.
X
XGNU DIFF is distributed in the hope that it will be useful,
Xbut WITHOUT ANY WARRANTY; without even the implied warranty of
XMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
XGNU General Public License for more details.
X
XYou should have received a copy of the GNU General Public License
Xalong with GNU DIFF; see the file COPYING. If not, write to
Xthe Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
X
X/* GNU DIFF was written by Mike Haertel, David Hayes,
X Richard Stallman and Len Tower. */
X
X#define GDIFF_MAIN
X#include "regex.h"
X#include "diff.h"
X
X
X/* Nonzero for -r: if comparing two directories,
X compare their common subdirectories recursively. */
X
Xint recursive;
X
X/* For debugging: don't do discard_confusing_lines. */
X
Xint no_discards;
X
Xvoid specify_style();
X
X/* Return a string containing the command options with which diff was invoked.
X Spaces appear between what were separate ARGV-elements.
X There is a space at the beginning but none at the end.
X If there were no options, the result is an empty string.
X
X Arguments: VECTOR, a vector containing separate ARGV-elements, and COUNT,
X the length of that vector. */
X
Xstatic char *
Xoption_list (vector, count)
X char **vector;
X int count;
X{
X int i;
X int length = 0;
X char *result;
X
X for (i = 0; i < count; i++)
X length += strlen (vector[i]) + 1;
X
X result = (char *) xmalloc (length + 1);
X result[0] = 0;
X
X for (i = 0; i < count; i++)
X {
X strcat (result, " ");
X strcat (result, vector[i]);
X }
X
X return result;
X}
X
Xmain (argc, argv)
X int argc;
X char *argv[];
X{
X int val;
X int c;
X int prev = -1;
X
X extern int optind;
X extern char *optarg;
X
X program = argv[0];
X
X /* Do our initializations. */
X output_style = OUTPUT_NORMAL;
X always_text_flag = FALSE;
X ignore_space_change_flag = FALSE;
X ignore_all_space_flag = FALSE;
X length_varies = FALSE;
X ignore_case_flag = FALSE;
X ignore_blank_lines_flag = FALSE;
X ignore_regexp = 0;
X function_regexp = 0;
X print_file_same_flag = FALSE;
X entire_new_file_flag = FALSE;
X context = -1;
X line_end_char = '\n';
X tab_align_flag = FALSE;
X tab_expand_flag = FALSE;
X recursive = FALSE;
X paginate_flag = FALSE;
X heuristic = FALSE;
X dir_start_file = NULL;
X msg_chain = NULL;
X msg_chain_end = NULL;
X no_discards = 0;
X
X /* Decode the options. */
X
X while ((c = getopt (argc, argv, "0123456789abBcC:defF:hHiI:lnNprsS:tTw"))
X != EOF)
X {
X switch (c)
X {
X /* All digits combine in decimal to specify the context-size. */
X case '1':
X case '2':
X case '3':
X case '4':
X case '5':
X case '6':
X case '7':
X case '8':
X case '9':
X case '0':
X if (context == -1)
X context = 0;
X /* If a context length has already been specified,
X more digits allowed only if they follow right after the others.
X Reject two separate runs of digits, or digits after -C. */
X else if (prev < '0' || prev > '9')
X fatal ("context length specified twice");
X
X context = context * 10 + c - '0';
X break;
X
X case 'a':
X /* Treat all files as text files; never treat as binary. */
X always_text_flag = 1;
X break;
X
X case 'b':
X /* Ignore changes in amount of whitespace. */
X ignore_space_change_flag = 1;
X length_varies = 1;
X break;
X
X case 'B':
X /* Ignore changes affecting only blank lines. */
X ignore_blank_lines_flag = 1;
X break;
X
X case 'c':
X /* Make context-style output. */
X specify_style (OUTPUT_CONTEXT);
X break;
X
X case 'C':
X if (context >= 0)
X fatal ("context length specified twice");
X {
X char *p;
X for (p = optarg; *p; p++)
X if (*p < '0' || *p > '9')
X fatal ("invalid context length argument (-C option)");
X }
X context = atoi (optarg);
X break;
X
X case 'd':
X /* Don't discard lines. This makes things slower (sometimes much
X slower) but will find a guaranteed minimal set of changes. */
X no_discards = 1;
X break;
X
X case 'e':
X /* Make output that is a valid `ed' script. */
X specify_style (OUTPUT_ED);
X break;
X
X case 'f':
X /* Make output that looks vaguely like an `ed' script
X but has changes in the order they appear in the file. */
X specify_style (OUTPUT_FORWARD_ED);
X break;
X
X case 'F':
X /* Show, for each set of changes, the previous line that
X matches the specified regexp. Currently affects only
X context-style output. */
X function_regexp = optarg;
X break;
X
X case 'h':
X /* Split the files into chunks of around 1500 lines
X for faster processing. Usually does not change the result.
X
X This currently has no effect. */
X break;
X
X case 'H':
X /* Turn on heuristics that speed processing of large files
X with a small density of changes. */
X heuristic = 1;
X break;
X
X case 'i':
X /* Ignore changes in case. */
X ignore_case_flag = 1;
X break;
X
X case 'I':
X /* Ignore changes affecting only lines that match the
X specified regexp. */
X ignore_regexp = optarg;
X break;
X
X case 'l':
X /* Pass the output through `pr' to paginate it. */
X paginate_flag = 1;
X break;
X
X case 'n':
X /* Output RCS-style diffs, like `-f' except that each command
X specifies the number of lines affected. */
X specify_style (OUTPUT_RCS);
X break;
X
X case 'N':
X /* When comparing directories, if a file appears only in one
X directory, treat it as present but empty in the other. */
X entire_new_file_flag = 1;
X break;
X
X case 'p':
X /* Make context-style output and show name of last C function. */
X specify_style (OUTPUT_CONTEXT);
X function_regexp = "^[_a-zA-Z]";
X break;
X
X case 'r':
X /* When comparing directories,
X recursively compare any subdirectories found. */
X recursive = 1;
X break;
X
X case 's':
X /* Print a message if the files are the same. */
X print_file_same_flag = 1;
X break;
X
X case 'S':
X /* When comparing directories, start with the specified
X file name. This is used for resuming an aborted comparison. */
X dir_start_file = optarg;
X break;
X
X case 't':
X /* Expand tabs to spaces in the output so that it preserves
X the alignment of the input files. */
X tab_expand_flag = 1;
X break;
X
X case 'T':
X /* Use a tab in the output, rather than a space, before the
X text of an input line, so as to keep the proper alignment
X in the input line without changing the characters in it. */
X tab_align_flag = 1;
X break;
X
X case 'w':
X /* Ignore horizontal whitespace when comparing lines. */
X ignore_all_space_flag = 1;
X length_varies = 1;
X break;
X }
X prev = c;
X }
X
X if (optind != argc - 2)
X fatal ("requires two file names. Usage: diff [-options] file1 file2");
X
X /*
X * @@ need more complicated usage string for directory options??
X * Note three liner at top of BSD documentation, and John Gilmore
X * message in his public domain tar being used by GNU.
X */
X
X if (ignore_regexp)
X {
X char *val;
X bzero (&ignore_regexp_compiled, sizeof ignore_regexp_compiled);
X val = re_compile_pattern (ignore_regexp, strlen (ignore_regexp),
X &ignore_regexp_compiled);
X if (val != 0)
X error ("-I option: ", val);
X ignore_regexp_compiled.fastmap = (char *) xmalloc (256);
X }
X
X if (function_regexp)
X {
X char *val;
X bzero (&function_regexp_compiled, sizeof function_regexp_compiled);
X val = re_compile_pattern (function_regexp, strlen (function_regexp),
X &function_regexp_compiled);
X if (val != 0)
X error ("-F option: ", val);
X function_regexp_compiled.fastmap = (char *) xmalloc (256);
X }
X
X if (output_style != OUTPUT_CONTEXT)
X context = 0;
X else if (context == -1)
X /* Default amount of context for -c. */
X context = 3;
X
X switch_string = option_list (argv + 1, optind - 1);
X
X val = compare_files (0, argv[optind], 0, argv[optind + 1], 0);
X
X /* Print any messages that were saved up for last. */
X print_message_queue ();
X
X exit (val);
X}
X
Xvoid specify_style (style)
X enum output_style style;
X{
X if (output_style != OUTPUT_NORMAL
X && output_style != style)
X error ("conflicting specifications of output style");
X output_style = style;
X}
X
X/* Compare two files (or dirs) with specified names
X DIR0/NAME0 and DIR1/NAME1, at level DEPTH in directory recursion.
X (if DIR0 is 0, then the name is just NAME0, etc.)
X This is self-contained; it opens the files and closes them.
X
X Value is 0 if files are identical, 1 if different,
X 2 if there is a problem opening them. */
X
Xint
Xcompare_files (dir0, name0, dir1, name1, depth)
X char *dir0, *dir1;
X char *name0, *name1;
X int depth;
X{
X struct file_data inf[2];
X register int i;
X int val;
X int errorcount = 0;
X int stat_result[2];
X
X /* If this is directory comparison, perhaps we have a file
X that exists only in one of the directories.
X If so, just print a message to that effect. */
X
X if (! entire_new_file_flag && (name0 == 0 || name1 == 0))
X {
X char *name = name0 == 0 ? name1 : name0;
X char *dir = name0 == 0 ? dir1 : dir0;
X message ("Only in %s: %s\n", dir, name);
X /* Return 1 so that diff_dirs will return 1 ("some files differ"). */
X return 1;
X }
X
X /* Mark any nonexistent file with -1 in the desc field. */
X
X inf[0].desc = name0 == 0 ? -1 : 0;
X inf[1].desc = name1 == 0 ? -1 : 0;
X
X /* Now record the full name of each file, including nonexistent ones. */
X
X if (name0 == 0)
X name0 = name1;
X if (name1 == 0)
X name1 = name0;
X
X inf[0].name = dir0 == 0 ? name0 : concat (dir0, "/", name0);
X inf[1].name = dir1 == 0 ? name1 : concat (dir1, "/", name1);
X
X /* Stat the files. Record whether they are directories.
X Record in stat_result whether stat fails. */
X
X for (i = 0; i <= 1; i++)
X {
X inf[i].stat.st_size = 0;
X inf[i].stat.st_mtime = 0;
X inf[i].dir_p = 0;
X stat_result[i] = 0;
X
X if (inf[i].desc != -1
X && strcmp (inf[i].name, "-"))
X {
X char *filename = inf[i].name;
X
X stat_result[i] = stat (filename, &inf[i].stat);
X if (stat_result[i] < 0)
X {
X perror_with_name (filename);
X errorcount = 1;
X }
X else
X#ifdef AMIGA
X inf[i].dir_p = (inf[i].stat.st_type > 0);
X#else
X inf[i].dir_p = (S_IFDIR == (inf[i].stat.st_mode & S_IFMT));
X#endif
X }
X }
X
X /* See if the two named files are actually the same physical file.
X If so, we know they are identical without actually reading them. */
X
X#ifndef AMIGA
X if (inf[0].stat.st_ino == inf[1].stat.st_ino
X && inf[0].stat.st_dev == inf[1].stat.st_dev
X && stat_result[0] == 0
X && stat_result[1] == 0)
X {
X val = 0;
X goto done;
X }
X#endif
X
X if (name0 == 0)
X inf[0].dir_p = inf[1].dir_p;
X if (name1 == 0)
X inf[1].dir_p = inf[0].dir_p;
X
X /* Open the files and record their descriptors. */
X
X for (i = 0; i <= 1; i++)
X {
X if (inf[i].desc == -1)
X ;
X else if (!strcmp (inf[i].name, "-"))
X {
X inf[i].desc = fileno(stdin);
X inf[i].name = "Standard Input";
X#ifdef AMIGA
X inf[i].stat.st_type = -1;
X#endif
X }
X /* Don't bother opening if stat already failed. */
X else if (stat_result[i] == 0 && ! inf[i].dir_p)
X {
X char *filename = inf[i].name;
X
X inf[i].desc = open (filename, O_RDONLY, 0);
X if (0 > inf[i].desc)
X {
X perror_with_name (filename);
X errorcount = 1;
X }
X }
X }
X
X if (errorcount)
X {
X
X /* If either file should exist but fails to be opened, return 2. */
X
X val = 2;
X
X }
X else if (inf[0].dir_p && inf[1].dir_p)
X {
X
X /* If both are directories, compare the files in them. */
X
X if (depth > 0 && !recursive)
X {
X /* But don't compare dir contents one level down
X unless -r was specified. */
X message ("Common subdirectories: %s and %s\n",
X inf[0].name, inf[1].name);
X val = 0;
X }
X else
X {
X val = diff_dirs (inf[0].name, inf[1].name,
X compare_files, depth, 0, 0);
X }
X
X }
X else if (depth == 0 && (inf[0].dir_p || inf[1].dir_p))
X {
X
X /* If only one is a directory, and it was specified in the command line,
X use the file in that dir whose basename matches the other file. */
X
X int dir_arg = (inf[0].dir_p ? 0 : 1);
X int fnm_arg = (inf[0].dir_p ? 1 : 0);
X char *p = strrchr(inf[fnm_arg].name, '/');
X char *filename = concat (inf[dir_arg].name, "/",
X (p ? p+1 : inf[fnm_arg].name));
X
X#ifdef AMIGA
X inf[dir_arg].dir_p = (getfa(filename) == 1);
X if (!inf[dir_arg].dir_p)
X {
X if (stat (filename,&inf[dir_arg].stat) < 0)
X pfatal_with_name (filename);
X inf[dir_arg].desc = open (filename, O_RDONLY, 0);
X if (0 > inf[dir_arg].desc)
X {
X perror_with_name (filename);
X val = 2;
X }
X/* free (inf[dir_arg].name); */
X inf[dir_arg].name = filename;
X val = diff_2_files (inf, depth);
X }
X else
X {
X error ("%s is a directory but %s is not",
X inf[dir_arg].name, inf[fnm_arg].name);
X val = 2;
X }
X#else
X inf[dir_arg].desc = open (filename, O_RDONLY, 0);
X
X if (0 > inf[dir_arg].desc)
X {
X perror_with_name (filename);
X val = 2;
X }
X else
X {
X /* JF: patch from the net to check and make sure we can really free
X this. If it's from argv[], freeing it is a *really* bad idea */
X if (0 != (dir_arg ? dir1 : dir0))
X free (inf[dir_arg].name);
X inf[dir_arg].name = filename;
X if (fstat (inf[dir_arg].desc, &inf[dir_arg].stat) < 0)
X pfatal_with_name (inf[dir_arg].name);
X
X inf[dir_arg].dir_p
X = (S_IFDIR == (inf[dir_arg].stat.st_mode & S_IFMT));
X if (inf[dir_arg].dir_p)
X {
X error ("%s is a directory but %s is not",
X inf[dir_arg].name, inf[fnm_arg].name);
X val = 1;
X }
X else
X val = diff_2_files (inf, depth);
X }
X#endif
X }
X else if (depth > 0 && (inf[0].dir_p || inf[1].dir_p))
X {
X /* Perhaps we have a subdirectory that exists only in one directory.
X If so, just print a message to that effect. */
X
X if (inf[0].desc == -1 || inf[1].desc == -1)
X {
X if (entire_new_file_flag && recursive)
X val = diff_dirs (inf[0].name, inf[1].name, compare_files, depth,
X inf[0].desc == -1, inf[1].desc == -1);
X else
X {
X char *dir = (inf[0].desc == -1) ? dir1 : dir0;
X message ("Only in %s: %s\n", dir, name0);
X val = 1;
X }
X }
X else
X {
X /* We have a subdirectory in one directory
X and a file in the other. */
X
X if (inf[0].dir_p)
X message ("%s is a directory but %s is not\n",
X inf[0].name, inf[1].name);
X else
X message ("%s is a directory but %s is not\n",
X inf[1].name, inf[0].name);
X /* This is a difference. */
X val = 1;
X }
X }
X else
X {
X
X /* Both exist and both are ordinary files. */
X
X val = diff_2_files (inf, depth);
X
X }
X
X /* Now the comparison has been done, if no error prevented it,
X and VAL is the value this function will return. */
X
X if (inf[0].desc > 0)
X close (inf[0].desc);
X if (inf[1].desc > 0)
X close (inf[1].desc);
X
X done:
X if (val == 0 && print_file_same_flag && !inf[0].dir_p)
X message ("Files %s and %s are identical\n",
X inf[0].name, inf[1].name);
X
X fflush (stdout);
X
X if (dir0 != 0)
X free (inf[0].name);
X if (dir1 != 0)
X free (inf[1].name);
X
X return val;
X}
SHAR_EOF
echo "extracting diff/diff3.c"
sed 's/^X//' << \SHAR_EOF > diff/diff3.c
X/* Three-way file comparison program (diff3) for Project GNU
X Copyright (C) 1988, 1989 Free Software Foundation, Inc.
X
X This program is free software; you can redistribute it and/or modify
X it under the terms of the GNU General Public License as published by
X the Free Software Foundation; either version 1, or (at your option)
X any later version.
X
X This program is distributed in the hope that it will be useful,
X but WITHOUT ANY WARRANTY; without even the implied warranty of
X MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
X GNU General Public License for more details.
X
X You should have received a copy of the GNU General Public License
X along with this program; if not, write to the Free Software
X Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
X
X
X/* Written by Randy Smith */
X
X/*
X * Include files.
X */
X#include <stdio.h>
X#include <ctype.h>
X
X#if defined(USG) || defined(AMIGA)
X/* Define needed BSD functions in terms of sysV library. */
X
X#define bcopy(s,d,n) memcpy((d),(s),(n))
X#define bcmp(s1,s2,n) memcmp((s1),(s2),(n))
X#define bzero(s,n) memset((s),0,(n))
X#endif
X
X#ifdef USG
X#define dup2(f,t) (close(t),fcntl((f),F_DUPFD,(t)))
X
X#define vfork fork
X#define index strchr
X#define rindex strrchr
X#endif
X/*
X * Internal data structures and macros for the diff3 program; includes
X * data structures for both diff3 diffs and normal diffs.
X */
X
X/*
X * Different files within a diff
X */
X#define FILE0 0
X#define FILE1 1
X#define FILE2 2
X
X/*
X * Three way diffs are build out of two two-way diffs; the file which
X * the two two-way diffs share is:
X */
X#define FILEC FILE0
X
X/* The ranges are indexed by */
X#define START 0
X#define END 1
X
Xenum diff_type {
X ERROR, /* Should not be used */
X ADD, /* Two way diff add */
X CHANGE, /* Two way diff change */
X DELETE, /* Two way diff delete */
X DIFF_ALL, /* All three are different */
X DIFF_1ST, /* Only the first is different */
X DIFF_2ND, /* Only the second */
X DIFF_3RD /* Only the third */
X};
X
X/* Two-way diff */
Xstruct diff_block {
X int ranges[2][2]; /* Ranges are inclusive */
X char **lines[2]; /* The actual lines (may contain nulls) */
X int *lengths[2]; /* The lengths of the lines (since nulls) */
X struct diff_block *next;
X};
X
X/* Three-way diff */
X
Xstruct diff3_block {
X enum diff_type correspond; /* Type of diff */
X int ranges[3][2]; /* Ranges are inclusive */
X char **lines[3]; /* The actual lines (may contain nulls) */
X int *lengths[3]; /* The lengths of the lines (since nulls) */
X struct diff3_block *next;
X};
X
X/*
X * Access the ranges on a diff block.
X */
X#define D_LOWLINE(diff, filenum) \
X ((diff)->ranges[filenum][START])
X#define D_HIGHLINE(diff, filenum) \
X ((diff)->ranges[filenum][END])
X#define D_NUMLINES(diff, filenum) \
X (D_HIGHLINE((diff), (filenum)) - D_LOWLINE((diff), (filenum)) + 1)
X
X/*
X * Access the line numbers in a file in a diff by absolute line number
X * (i.e. line number within the original file). Note that these are
X * lvalues and can be used for assignment.
X */
X#define D_LINENUM(diff, filenum, linenum) \
X (*((diff)->lines[filenum] + linenum - D_LOWLINE((diff), (filenum))))
X#define D_LINELEN(diff, filenum, linenum) \
X (*((diff)->lengths[filenum] + linenum - D_LOWLINE((diff), (filenum))))
X
X/*
X * Access the line numbers in a file in a diff by relative line
X * numbers (i.e. line number within the diff itself). Note that these
X * are lvalues and can be used for assignment.
X */
X#define D_RELNUM(diff, filenum, linenum) \
X (*((diff)->lines[filenum] + linenum))
X#define D_RELLEN(diff, filenum, linenum) \
X (*((diff)->lengths[filenum] + linenum))
X
X/*
X * And get at them directly, when that should be necessary.
X */
X#define D_LINEARRAY(diff, filenum) \
X ((diff)->lines[filenum])
X#define D_LENARRAY(diff, filenum) \
X ((diff)->lengths[filenum])
X
X/*
X * Next block.
X */
X#define D_NEXT(diff) ((diff)->next)
X
X/*
X * Access the type of a diff3 block.
X */
X#define D3_TYPE(diff) ((diff)->correspond)
X
X/*
X * Line mappings based on diffs. The first maps off the top of the
X * diff, the second off of the bottom.
X */
X#define D_HIGH_MAPLINE(diff, fromfile, tofile, lineno) \
X ((lineno) \
X - D_HIGHLINE ((diff), (fromfile)) \
X + D_HIGHLINE ((diff), (tofile)))
X
X#define D_LOW_MAPLINE(diff, fromfile, tofile, lineno) \
X ((lineno) \
X - D_LOWLINE ((diff), (fromfile)) \
X + D_LOWLINE ((diff), (tofile)))
X
X/*
X * General memory allocation function.
X */
X#define ALLOCATE(number, type) \
X (type *) xmalloc ((number) * sizeof (type))
X
X/*
X * Options variables for flags set on command line.
X *
X * EDSCRIPT: Write out an ed script instead of the standard diff3 format.
X *
X * FLAGGING: Indicates that in the case of overlapping diffs (type
X * DIFF_ALL), the lines which would normally be deleted from file 1
X * should be preserved with a special flagging mechanism.
X *
X * DONT_WRITE_OVERLAP: 1 if information for overlapping diffs should
X * not be output.
X *
X * DONT_WRITE_SIMPLE: 1 if information for non-overlapping diffs
X * should not be output.
X *
X * FINALWRITE: 1 if a :wq should be included at the end of the script
X * to write out the file being edited.
X */
X#define DIFF_PROGRAM "rcs:diff"
X
Xint edscript;
Xint flagging;
Xint dont_write_overlap;
Xint dont_write_simple;
Xint finalwrite;
Xint overlaps;
Xextern int optind;
X
Xchar *argv0;
X
X/*
X * Forward function declarations.
X */
Xstruct diff_block *process_diff ();
Xstruct diff3_block *make_3way_diff ();
Xvoid output_diff3 ();
Xvoid output_diff3_edscript ();
Xvoid usage ();
Xvoid fatal ();
Xvoid perror_with_exit ();
X
Xstruct diff3_block *using_to_diff3_block ();
Xint copy_stringlist ();
Xstruct diff3_block *create_diff3_block ();
Xint compare_line_list ();
X
Xint read_diff ();
Xenum diff_type process_diff_control ();
Xchar *scan_diff_line ();
X
Xstruct diff3_block *reverse_diff3_blocklist ();
X
Xvoid *xmalloc ();
Xvoid *xrealloc ();
X
X/*
X * No options take arguments. "i" is my own addition; it stands for
X * "include write command", to emulate system V behavior.
X */
X#define ARGSTRING "eix3EX"
X
Xchar diff_program[] = DIFF_PROGRAM;
X
X/*
X * Main program. Calls diff twice on two pairs of input files,
X * combines the two diffs, and outputs them.
X */
Xmain (argc, argv)
X int argc;
X char **argv;
X{
X int c;
X int mapping [3];
X int shiftmap;
X int incompat;
X struct diff_block *thread1, *thread2;
X struct diff3_block *diff;
X
X edscript = flagging = dont_write_overlap
X = dont_write_simple = finalwrite = 0;
X incompat = shiftmap = 0;
X
X argv0 = argv[0];
X
X while ((c = getopt (argc, argv, ARGSTRING)) != EOF)
X {
X edscript = 1;
X switch (c)
X {
X case 'x':
X dont_write_simple = 1;
X incompat++;
X break;
X case '3':
X dont_write_overlap = 1;
X incompat++;
X break;
X case 'i':
X finalwrite = 1;
X incompat++;
X break;
X case 'X':
X dont_write_simple = 1;
X /* Falls through */
X case 'E':
X flagging = 1;
X /* Falls through */
X case 'e':
X incompat++;
X break;
X case '?':
X default:
X usage ();
X /* NOTREACHED */
X }
X }
X
X if (incompat > 1) /* Make sure you only have one of a */
X /* set of arguments */
X usage ();
X
X if (argc - optind != 3)
X usage ();
X
X if (*argv[optind] == '-' && *(argv[optind] + 1) == '\0')
X {
X /* Sigh. We've got standard input as the first arg. We can't */
X /* call diff twice on stdin */
X mapping [0] = 1;
X mapping [1] = 2;
X mapping [2] = 0;
X shiftmap = 1;
X }
X else
X {
X /* Normal, what you'd expect */
X mapping [0] = 0;
X mapping [1] = 1;
X mapping [2] = 2;
X shiftmap = 0;
X }
X
X if (shiftmap)
X {
X thread1 = process_diff (argv[optind + 2], argv[optind]);
X thread2 = process_diff (argv[optind + 2], argv[optind + 1]);
X }
X else
X {
X thread1 = process_diff (argv[optind], argv[optind + 1]);
X thread2 = process_diff (argv[optind], argv[optind + 2]);
X }
X diff = make_3way_diff (thread1, thread2);
X if (edscript)
X output_diff3_edscript (stdout, diff, mapping, argv[optind],
X argv[optind + 1], argv[optind + 2]);
X else
X output_diff3 (stdout, diff, mapping);
X exit (overlaps);
X}
X
X/*
X * Explain, patiently and kindly, how to use this program. Then exit.
X */
Xvoid
Xusage ()
X{
X fprintf (stderr, "Usage:\t%s [ -exEX3 ] [ -i ] file1 file2 file3\n",
X argv0);
X fprintf (stderr, "\tOnly one of [exEX3] allowed\n");
X exit (1);
X}
X
X/*
X * Routines that combine the two diffs together into one. The
X * algorithm used follows:
X *
X * File0 is shared in common between the two diffs.
X * Diff01 is the diff between 0 and 1.
X * Diff02 is the diff between 0 and 2.
X *
X * 1) Find the range for the first block in File0.
X * a) Take the lowest of the two ranges (in File0) in the two
X * current blocks (one from each diff) as being the low
X * water mark. Assign the upper end of this block as
X * being the high water mark and move the current block up
X * one. Mark the block just moved over as to be used.
X * b) Check the next block in the diff that the high water
X * mark is *not* from.
X *
X * *If* the high water mark is above
X * the low end of the range in that block,
X *
X * mark that block as to be used and move the current
X * block up. Set the high water mark to the max of
X * the high end of this block and the current. Repeat b.
X *
X * 2) Find the corresponding ranges in Files1 (from the blocks
X * in diff01; line per line outside of diffs) and in File2.
X * Create a diff3_block, reserving space as indicated by the ranges.
X *
X * 3) Copy all of the pointers for file0 in. At least for now,
X * do bcmp's between corresponding strings in the two diffs.
X *
X * 4) Copy all of the pointers for file1 and 2 in. Get what you
X * need from file0 (when there isn't a diff block, it's
X * identical to file0 within the range between diff blocks).
X *
X * 5) If the diff blocks you used came from only one of the two
X * strings of diffs, then that file (i.e. the one other than
X * file 0 in that diff) is the odd person out. If you used
X * diff blocks from both sets, check to see if files 1 and 2 match:
X *
X * Same number of lines? If so, do a set of bcmp's (if a
X * bcmp matches; copy the pointer over; it'll be easier later
X * if you have to do any compares). If they match, 1 & 2 are
X * the same. If not, all three different.
X *
X * Then you do it again, until you run out of blocks.
X *
X */
X
X/*
X * This routine makes a three way diff (chain of diff3_block's) from two
X * two way diffs (chains of diff_block's). It is assumed that each of
X * the two diffs passed are off of the same file (i.e. that each of the
X * diffs were made "from" the same file). The three way diff pointer
X * returned will have numbering 0--the common file, 1--the other file
X * in diff1, and 2--the other file in diff2.
X */
Xstruct diff3_block *
Xmake_3way_diff (thread1, thread2)
X struct diff_block *thread1, *thread2;
X{
X/*
X * This routine works on the two diffs passed to it as threads.
X * Thread number 0 is diff1, thread number 1 is diff2. The USING
X * array is set to the base of the list of blocks to be used to
X * construct each block of the three way diff; if no blocks from a
X * particular thread are to be used, that element of the using array
X * is set to 0. The elements LAST_USING array are set to the last
X * elements on each of the using lists.
X *
X * The HIGH_WATER_MARK is set to the highest line number in File 0
X * described in any of the diffs in either of the USING lists. The
X * HIGH_WATER_THREAD names the thread. Similarly the BASE_WATER_MARK
X * and BASE_WATER_THREAD describe the lowest line number in File 0
X * described in any of the diffs in either of the USING lists. The
X * HIGH_WATER_DIFF is the diff from which the HIGH_WATER_MARK was
X * taken.
X *
X * The HIGH_WATER_DIFF should always be equal to LAST_USING
X * [HIGH_WATER_THREAD]. The OTHER_DIFF is the next diff to check for
X * higher water, and should always be equal to
X * CURRENT[HIGH_WATER_THREAD ^ 0x1]. The OTHER_THREAD is the thread
X * in which the OTHER_DIFF is, and hence should always be equal to
X * HIGH_WATER_THREAD ^ 0x1.
X *
X * The variable LAST_DIFF is kept set to the last diff block produced
X * by this routine, for line correspondence purposes between that diff
X * and the one currently being worked on. It is initialized to
X * ZERO_DIFF before any blocks have been created.
X */
X
X struct diff_block
X *using[2],
X *last_using[2],
X *current[2];
X
X int
X high_water_mark,
X base_water_mark;
X
X int
X high_water_thread,
X base_water_thread,
X other_thread;
X
X struct diff_block
X *high_water_diff,
X *other_diff;
X
X struct diff3_block
X *result,
X *tmpblock,
X *result_last,
X *last_diff;
X
X static struct diff3_block zero_diff = {
X ERROR,
X { {0, 0}, {0, 0}, {0, 0} },
X { (char **) 0, (char **) 0, (char **) 0 },
X { (int *) 0, (int *) 0, (int *) 0 },
X (struct diff3_block *) 0
X };
X
X /* Initialization */
X result = result_last = (struct diff3_block *) 0;
X current[0] = thread1; current[1] = thread2;
X last_diff = &zero_diff;
X
X /* Sniff up the threads until we reach the end */
X
X while (current[0] || current[1])
X {
X using[0] = using[1] = last_using[0] = last_using[1] =
X (struct diff_block *) 0;
X
X /* Setup low and high water threads, diffs, and marks */
X if (!current[0])
X base_water_thread = 1;
X else if (!current[1])
X base_water_thread = 0;
X else
X base_water_thread =
X (D_LOWLINE (current[0], FILE0)
X > D_LOWLINE (current[1], FILE0));
X high_water_thread = base_water_thread;
X
X high_water_diff = current[high_water_thread];
X
X /* low and high waters start off same diff */
X base_water_mark = D_LOWLINE (high_water_diff, FILE0);
X
X high_water_mark = D_HIGHLINE (high_water_diff, FILE0);
X
X /* Make the diff you just got info from into the using class */
X using[high_water_thread]
X = last_using[high_water_thread]
X = high_water_diff;
X current[high_water_thread] = high_water_diff->next;
X last_using[high_water_thread]->next
X = (struct diff_block *) 0;
X
X /* And mark the other diff */
X other_thread = high_water_thread ^ 0x1;
X other_diff = current[other_thread];
X
X /* Shuffle up the ladder, checking the other diff to see if it
X needs to be incorporated */
X while (other_diff
X && D_LOWLINE (other_diff, FILE0) <= high_water_mark + 1)
X {
X
X /* Incorporate this diff into the using list. Note that
X this doesn't take it off the current list */
X if (using[other_thread])
X last_using[other_thread]->next = other_diff;
X else
X using[other_thread] = other_diff;
X last_using[other_thread] = other_diff;
X
X /* Take it off the current list. Note that this following
X code assumes that other_diff enters it equal to
X current[high_water_thread ^ 0x1] */
X current[other_thread]
X = current[other_thread]->next;
X other_diff->next
X = (struct diff_block *) 0;
X
X /* Set the high_water stuff
X If this comparison is equal, then this is the last pass
X through this loop; since diff blocks within a given
X thread cannot overlap, the high_water_mark will be
X *below* the range_start of either of the next diffs. */
X
X if (high_water_mark < D_HIGHLINE (other_diff, FILE0))
X {
X high_water_thread ^= 1;
X high_water_diff = other_diff;
X high_water_mark = D_HIGHLINE (other_diff, FILE0);
X }
X
X /* Set the other diff */
X other_thread = high_water_thread ^ 0x1;
X other_diff = current[other_thread];
X }
X
X /* The using lists contain a list of all of the blocks to be
X included in this diff3_block. Create it. */
X
X tmpblock = using_to_diff3_block (using, last_using,
X base_water_thread, high_water_thread,
X last_diff);
X
X if (!tmpblock)
X fatal ("internal: screwup in format of diff blocks");
X
X /* Put it on the list */
X if (result)
X result_last->next = tmpblock;
X else
X result = tmpblock;
X result_last = tmpblock;
X
X /* Setup corresponding lines correctly */
X last_diff = tmpblock;
X }
X return result;
X}
X
X/*
X * using_to_diff3_block:
X * This routine takes two lists of blocks (from two separate diff
X * threads) and puts them together into one diff3 block.
X * It then returns a pointer to this diff3 block or 0 for failure.
X *
X * All arguments besides using are for the convenience of the routine;
X * they could be derived from the using array.
X * LAST_USING is a pair of pointers to the last blocks in the using
X * structure.
X * LOW_THREAD and HIGH_THREAD tell which threads contain the lowest
X * and highest line numbers for File0.
X * last_diff contains the last diff produced in the calling routine.
X * This is used for lines mappings which would still be identical to
X * the state that diff ended in.
X *
X * A distinction should be made in this routine between the two diffs
X * that are part of a normal two diff block, and the three diffs that
X * are part of a diff3_block.
X */
Xstruct diff3_block *
Xusing_to_diff3_block (using, last_using, low_thread, high_thread, last_diff)
X struct diff_block
X *using[2],
X *last_using[2];
X int low_thread, high_thread;
X struct diff3_block *last_diff;
X{
X int lowc, highc, low1, high1, low2, high2;
X struct diff3_block *result;
X struct diff_block *ptr;
X int i;
X int current0line;
X
X /* Find the range in file0 */
X lowc = using[low_thread]->ranges[0][START];
X highc = last_using[high_thread]->ranges[0][END];
X
X /* Find the ranges in the other files.
X If using[x] is null, that means that the file to which that diff
X refers is equivalent to file 0 over this range */
X
X if (using[0])
X {
X low1 = D_LOW_MAPLINE (using[0], FILE0, FILE1, lowc);
X high1 = D_HIGH_MAPLINE (last_using[0], FILE0, FILE1, highc);
X }
X else
X {
X low1 = D_HIGH_MAPLINE (last_diff, FILEC, FILE1, lowc);
X high1 = D_HIGH_MAPLINE (last_diff, FILEC, FILE1, highc);
X }
X
X /*
X * Note that in the following, we use file 1 relative to the diff,
X * and file 2 relative to the corresponding lines struct.
X */
X if (using[1])
X {
X low2 = D_LOW_MAPLINE (using[1], FILE0, FILE1, lowc);
X high2 = D_HIGH_MAPLINE (last_using[1], FILE0, FILE1, highc);
X }
X else
X {
X low2 = D_HIGH_MAPLINE (last_diff, FILEC, FILE2, lowc);
X high2 = D_HIGH_MAPLINE (last_diff, FILEC, FILE2, highc);
X }
X
X /* Create a block with the appropriate sizes */
X result = create_diff3_block (lowc, highc, low1, high1, low2, high2);
X
X /* Copy over all of the information for File 0. Return with a zero
X if any of the compares failed. */
X for (ptr = using[0]; ptr; ptr = D_NEXT (ptr))
X {
X int result_offset = D_LOWLINE (ptr, FILE0) - lowc;
X int copy_size
X = D_HIGHLINE (ptr, FILE0) - D_LOWLINE (ptr, FILE0) + 1;
X
X if (!copy_stringlist (D_LINEARRAY (ptr, FILE0),
X D_LENARRAY (ptr, FILE0),
X D_LINEARRAY (result, FILEC) + result_offset,
X D_LENARRAY (result, FILEC) + result_offset,
X copy_size))
X return 0;
X }
X
X for (ptr = using[1]; ptr; ptr = D_NEXT (ptr))
X {
X int result_offset = D_LOWLINE (ptr, FILEC) - lowc;
X int copy_size
X = D_HIGHLINE (ptr, FILEC) - D_LOWLINE (ptr, FILEC) + 1;
X
X if (!copy_stringlist (D_LINEARRAY (ptr, FILE0),
X D_LENARRAY (ptr, FILE0),
X D_LINEARRAY (result, FILEC) + result_offset,
X D_LENARRAY (result, FILEC) + result_offset,
X copy_size))
X return 0;
X }
X
X /* Copy stuff for file 1. First deal with anything that might be
X before the first diff. */
X
X for (i = 0;
X i + low1 < (using[0] ? D_LOWLINE (using[0], FILE1) : high1 + 1);
X i++)
X {
X D_RELNUM (result, FILE1, i) = D_RELNUM (result, FILEC, i);
X D_RELLEN (result, FILE1, i) = D_RELLEN (result, FILEC, i);
X }
X
X for (ptr = using[0]; ptr; ptr = D_NEXT (ptr))
X {
X int result_offset = D_LOWLINE (ptr, FILE1) - low1;
X int copy_size
X = D_HIGHLINE (ptr, FILE1) - D_LOWLINE (ptr, FILE1) + 1;
X
X if (!copy_stringlist (D_LINEARRAY (ptr, FILE1),
X D_LENARRAY (ptr, FILE1),
X D_LINEARRAY (result, FILE1) + result_offset,
X D_LENARRAY (result, FILE1) + result_offset,
X copy_size))
X return 0;
X
X /* Catch the lines between here and the next diff */
X current0line = D_HIGHLINE (ptr, FILE0) + 1 - lowc;
X for (i = D_HIGHLINE (ptr, FILE1) + 1 - low1;
X i < (D_NEXT (ptr) ?
X D_LOWLINE (D_NEXT (ptr), FILE1) :
X high1 + 1) - low1;
X i++)
X {
X D_RELNUM (result, FILE1, i)
X = D_RELNUM (result, FILEC, current0line);
X D_RELLEN (result, FILE1, i)
X = D_RELLEN (result, FILEC, current0line++);
X }
X }
X
X /* Copy stuff for file 2. First deal with anything that might be
X before the first diff. */
X
X for (i = 0;
X i + low2 < (using[1] ? D_LOWLINE (using[1], FILE1) : high2 + 1);
X i++)
X {
X D_RELNUM (result, FILE2, i) = D_RELNUM (result, FILEC, i);
X D_RELLEN (result, FILE2, i) = D_RELLEN (result, FILEC, i);
X }
X
X for (ptr = using[1]; ptr; ptr = D_NEXT (ptr))
X {
X int result_offset = D_LOWLINE (ptr, FILE1) - low2;
X int copy_size
X = D_HIGHLINE (ptr, FILE1) - D_LOWLINE (ptr, FILE1) + 1;
X
X if (!copy_stringlist (D_LINEARRAY (ptr, FILE1),
X D_LENARRAY (ptr, FILE1),
X D_LINEARRAY (result, FILE2) + result_offset,
X D_LENARRAY (result, FILE2) + result_offset,
X copy_size))
X return 0;
X
X /* Catch the lines between here and the next diff */
X current0line = D_HIGHLINE (ptr, FILE0) + 1 - lowc;
X for (i = D_HIGHLINE (ptr, FILE1) + 1 - low2;
X i < (D_NEXT (ptr) ?
X D_LOWLINE (D_NEXT (ptr), FILE1) :
X high2 + 1) - low2;
X i++)
X {
X D_RELNUM (result, FILE2, i)
X = D_RELNUM (result, FILEC, current0line);
X D_RELLEN (result, FILE2, i)
X = D_RELLEN (result, FILEC, current0line++);
X }
X }
X
X /* Set correspond */
X if (!using[0])
X D3_TYPE (result) = DIFF_3RD;
X else if (!using[1])
X D3_TYPE (result) = DIFF_2ND;
X else
X {
X int nl1
X = D_HIGHLINE (result, FILE1) - D_LOWLINE (result, FILE1) + 1;
X int nl2
X = D_HIGHLINE (result, FILE2) - D_LOWLINE (result, FILE2) + 1;
X
X if (nl1 != nl2
X || !compare_line_list (D_LINEARRAY (result, FILE1),
X D_LENARRAY (result, FILE1),
X D_LINEARRAY (result, FILE2),
X D_LENARRAY (result, FILE2),
X nl1))
X D3_TYPE (result) = DIFF_ALL;
X else
X D3_TYPE (result) = DIFF_1ST;
X }
X
X return result;
X}
X
X/*
X * This routine copies pointers from a list of strings to a different list
X * of strings. If a spot in the second list is already filled, it
X * makes sure that it is filled with the same string; if not it
X * returns 0, the copy incomplete.
X * Upon successful completion of the copy, it returns 1.
X */
Xint
Xcopy_stringlist (fromptrs, fromlengths, toptrs, tolengths, copynum)
X char *fromptrs[], *toptrs[];
X int *fromlengths, *tolengths;
X int copynum;
X{
X register char
X **f = fromptrs,
X **t = toptrs;
X register int
X *fl = fromlengths,
X *tl = tolengths;
X
X while (copynum--)
X {
X if (*t)
X {
X if (*fl != *tl || bcmp (*f, *t, *fl))
X return 0;
X }
X else
X { *t = *f ; *tl = *fl; }
X
X t++; f++; tl++; fl++;
X }
X return 1;
X}
X
X/*
X * Create a diff3_block, with ranges as specified in the arguments.
X * Allocate the arrays for the various pointers (and zero them) based
X * on the arguments passed. Return the block as a result.
X */
Xstruct diff3_block *
Xcreate_diff3_block (low0, high0, low1, high1, low2, high2)
X register int low0, high0, low1, high1, low2, high2;
X{
X struct diff3_block *result = ALLOCATE (1, struct diff3_block);
X int numlines;
X
X D3_TYPE (result) = ERROR;
X
X /* Assign ranges */
X D_LOWLINE (result, FILE0) = low0;
X D_HIGHLINE (result, FILE0) = high0;
X D_LOWLINE (result, FILE1) = low1;
X D_HIGHLINE (result, FILE1) = high1;
X D_LOWLINE (result, FILE2) = low2;
X D_HIGHLINE (result, FILE2) = high2;
X
X /* Allocate and zero space */
X numlines = D_NUMLINES (result, FILE0);
X if (numlines)
X {
X D_LINEARRAY (result, FILE0) = ALLOCATE (numlines, char *);
X D_LENARRAY (result, FILE0) = ALLOCATE (numlines, int);
X bzero (D_LINEARRAY (result, FILE0), (numlines * sizeof (char *)));
X bzero (D_LENARRAY (result, FILE0), (numlines * sizeof (int)));
X }
X else
X {
X D_LINEARRAY (result, FILE0) = (char **) 0;
X D_LENARRAY (result, FILE0) = (int *) 0;
X }
X
X numlines = D_NUMLINES (result, FILE1);
X if (numlines)
X {
X D_LINEARRAY (result, FILE1) = ALLOCATE (numlines, char *);
X D_LENARRAY (result, FILE1) = ALLOCATE (numlines, int);
X bzero (D_LINEARRAY (result, FILE1), (numlines * sizeof (char *)));
X bzero (D_LENARRAY (result, FILE1), (numlines * sizeof (int)));
X }
X else
X {
X D_LINEARRAY (result, FILE1) = (char **) 0;
X D_LENARRAY (result, FILE1) = (int *) 0;
X }
X
X numlines = D_NUMLINES (result, FILE2);
X if (numlines)
X {
X D_LINEARRAY (result, FILE2) = ALLOCATE (numlines, char *);
X D_LENARRAY (result, FILE2) = ALLOCATE (numlines, int);
X bzero (D_LINEARRAY (result, FILE2), (numlines * sizeof (char *)));
X bzero (D_LENARRAY (result, FILE2), (numlines * sizeof (int)));
X }
X else
X {
X D_LINEARRAY (result, FILE2) = (char **) 0;
X D_LENARRAY (result, FILE2) = (int *) 0;
X }
X
X /* Return */
X return result;
X}
X
X/*
X * Compare two lists of lines of text.
X * Return 1 if they are equivalent, 0 if not.
X */
Xint
Xcompare_line_list (list1, lengths1, list2, lengths2, nl)
X char *list1[], *list2[];
X int *lengths1, *lengths2;
X int nl;
X{
X char
X **l1 = list1,
X **l2 = list2;
X int
X *lgths1 = lengths1,
X *lgths2 = lengths2;
X
X while (nl--)
X if (!*l1 || !*l2 || *lgths1 != *lgths2++
X || bcmp (*l1++, *l2++, *lgths1++))
X return 0;
X return 1;
X}
X
X/*
X * Routines to input and parse two way diffs.
X */
X
Xextern char *environ; /* I hope this is here */
X
X#define DIFF_CHUNK_SIZE 10000
X
Xstruct diff_block *
Xprocess_diff (filea, fileb)
X char *filea, *fileb;
X{
X char *diff_contents;
X int diff_size;
X char *scan_diff;
X enum diff_type dt;
X int i;
X struct diff_block *block_list, *block_list_end, *bptr;
X
X diff_size = read_diff (filea, fileb, &diff_contents);
X scan_diff = diff_contents;
X bptr = block_list_end = block_list = (struct diff_block *) 0;
X
X while (scan_diff - diff_contents < diff_size)
X {
X bptr = ALLOCATE (1, struct diff_block);
X bptr->lines[0] = bptr->lines[1] = (char **) 0;
X bptr->lengths[0] = bptr->lengths[1] = (int *) 0;
X
X dt = process_diff_control (&scan_diff, bptr);
X if (dt == ERROR) fatal ("Bad format in diff output");
X if (*scan_diff != '\n') fatal ("Bad format in diff output");
X scan_diff++;
X
X /* Force appropriate ranges to be null, if necessary */
X switch (dt)
X {
X case ADD:
X bptr->ranges[0][0]++;
X break;
X case DELETE:
X bptr->ranges[1][0]++;
X break;
X case CHANGE:
X break;
X default:
X fatal ("internal: Bad diff type in process_diff");
X break;
X }
X
X /* Allocate space for the pointers for the lines from filea, and
X parcel them out among these pointers */
X if (dt != ADD)
X {
X bptr->lines[0] = ALLOCATE ((bptr->ranges[0][END]
X - bptr->ranges[0][START] + 1),
X char *);
X bptr->lengths[0] = ALLOCATE ((bptr->ranges[0][END]
X - bptr->ranges[0][START] + 1),
X int);
X for (i = 0; i <= (bptr->ranges[0][END]
X - bptr->ranges[0][START]); i++)
X scan_diff = scan_diff_line (scan_diff,
X &(bptr->lines[0][i]),
X &(bptr->lengths[0][i]),
X diff_contents + diff_size,
X '<');
X }
X
X /* Get past the separator for changes */
X if (dt == CHANGE)
X {
X if (strncmp (scan_diff, "---\n", 4))
X fatal ("Bad diff format: bad change separator");
X scan_diff += 4;
X }
X
X /* Allocate space for the pointers for the lines from fileb, and
X parcel them out among these pointers */
X if (dt != DELETE)
X {
X bptr->lines[1] = ALLOCATE ((bptr->ranges[1][END]
X - bptr->ranges[1][START] + 1),
X char *);
X bptr->lengths[1] = ALLOCATE ((bptr->ranges[1][END]
X - bptr->ranges[1][START] + 1),
X int);
X for (i = 0; i <= (bptr->ranges[1][END]
X - bptr->ranges[1][START]); i++)
X scan_diff = scan_diff_line (scan_diff,
X &(bptr->lines[1][i]),
X &(bptr->lengths[1][i]),
X diff_contents + diff_size,
X '>');
X }
X
X /* Place this block on the blocklist */
X if (block_list_end)
X block_list_end->next = bptr;
X else
X block_list = bptr;
X
X block_list_end = bptr;
X
X }
X
X if (scan_diff - diff_contents != diff_size)
X fatal ("bad diff format; incomplete last line");
X
X return block_list;
X}
X
X/*
X * This routine will parse a normal format diff control string. It
X * returns the type of the diff (ERROR if the format is bad). All of
X * the other important information is filled into to the structure
X * pointed to by db, and the string pointer (whose location is passed
X * to this routine) is updated to point beyond the end of the string
X * parsed. Note that only the ranges in the diff_block will be set by
X * this routine.
X *
X * If some specific pair of numbers has been reduced to a single
X * number, then both corresponding numbers in the diff block are set
X * to that number. In general these numbers are interpetted as ranges
X * inclusive, unless being used by the ADD or DELETE commands. It is
X * assumed that these will be special cased in a superior routine.
X */
X
Xenum diff_type
Xprocess_diff_control (string, db)
X char **string;
X struct diff_block *db;
X{
X char *s = *string;
X int holdnum;
X enum diff_type type;
X
X/* These macros are defined here because they can use variables
X defined in this function. Don't try this at home kids, we're
X trained professionals!
X
X Also note that SKIPWHITE only recognizes tabs and spaces, and
X that READNUM can only read positive, integral numbers */
X
X#define SKIPWHITE(s) { while (*s == ' ' || *s == '\t') s++; }
X#define READNUM(s, num) \
X { if (!isdigit (*s)) return ERROR; holdnum = 0; \
X do { holdnum = (*s++ - '0' + holdnum * 10); } \
X while (isdigit (*s)); (num) = holdnum; }
X
X /* Read first set of digits */
X SKIPWHITE (s);
X READNUM (s, db->ranges[0][START]);
X
X /* Was that the only digit? */
X SKIPWHITE(s);
X if (*s == ',')
X {
X /* Get the next digit */
X s++;
X READNUM (s, db->ranges[0][END]);
X }
X else
X db->ranges[0][END] = db->ranges[0][START];
X
X /* Get the letter */
X SKIPWHITE (s);
X switch (*s)
X {
X case 'a':
X type = ADD;
X break;
X case 'c':
X type = CHANGE;
X break;
X case 'd':
X type = DELETE;
X break;
X default:
X return ERROR; /* Bad format */
X }
X s++; /* Past letter */
X
X /* Read second set of digits */
X SKIPWHITE (s);
X READNUM (s, db->ranges[1][START]);
X
X /* Was that the only digit? */
X SKIPWHITE(s);
X if (*s == ',')
X {
X /* Get the next digit */
X s++;
X READNUM (s, db->ranges[1][END]);
X SKIPWHITE (s); /* To move to end */
X }
X else
X db->ranges[1][END] = db->ranges[1][START];
X
X *string = s;
X return type;
X}
X
Xint
Xread_diff (filea, fileb, output_placement)
X char *filea, *fileb;
X char **output_placement;
X{
X char *cmd;
X void *malloc();
X int pipefd;
X FILE *pipefp, *popenl();
X char *diff_result;
X long current_chunk_size;
X int bytes;
X int total;
X
X cmd = (char *)malloc(strlen(diff_program) + strlen(filea) + strlen(fileb) + 2);
X if (cmd == NULL) {
X printf("Couldn't obtain memory for diff command\n");
X exit(1);
X }
X
X pipefp = popenl(diff_program, filea, fileb, NULL, "r");
X if (pipefp == NULL) {
X printf("Couldn't open pipe to diff program\n");
X exit(1);
X }
X pipefd = fileno(pipefp);
X current_chunk_size = DIFF_CHUNK_SIZE;
X diff_result = (char *) xmalloc (current_chunk_size);
X total = 0;
X do {
X bytes = myread (pipefd,
X diff_result + total,
X current_chunk_size - total);
X total += bytes;
X if (total == current_chunk_size)
X diff_result = (char *) xrealloc (diff_result, (current_chunk_size *= 2));
X } while (bytes);
X
X *output_placement = diff_result;
X pclose(pipefp);
X return total;
X}
X
X
X/*
X * Scan a regular diff line (consisting of > or <, followed by a
X * space, followed by text (including nulls) up to a newline.
X *
X * This next routine began life as a macro and many parameters in it
X * are used as call-by-reference values.
X */
Xchar *
Xscan_diff_line (scan_ptr, set_start, set_length, limit, firstchar)
X char *scan_ptr, **set_start;
X int *set_length;
X char *limit;
X char firstchar;
X{
X char *line_ptr = scan_ptr + 2;
X
X if (!(scan_ptr[0] == (firstchar)
X && scan_ptr[1] == ' '))
X fatal ("Bad diff format; incorrect leading line chars");
X
X *set_start = line_ptr;
X while (*line_ptr != '\n') line_ptr++;
X
X if (line_ptr >= limit)
X fatal ("Bad diff format; overflow in parse");
X
X /* Don't include newline, but do return the beginning of the
X next line */
X *set_length = line_ptr - *set_start;
X
X return line_ptr + 1;
X}
X
X/*
X * This routine outputs a three way diff passed as a list of
X * diff3_block's.
X * The argument MAPPING is indexed by external file number (in the
X * argument list) and contains the internal file number (from the
X * diff passed). This is important because the user expects his
X * outputs in terms of the argument list number, and the diff passed
X * may have been done slightly differently (if the first argument in
X * the argument list was the standard input, for example).
X */
Xvoid
Xoutput_diff3 (outputfile, diff, mapping)
X FILE *outputfile;
X struct diff3_block *diff;
X int mapping[3];
X{
X int rev_mapping[3];
X static int eliminate[3] = { 1, 0, 0};
X int i;
X int oddoneout;
X char *cp;
X struct diff3_block *ptr;
X int line;
X int dontprint;
X static int skew_increment[3] = { 2, 3, 1 }; /* 0==>2==>1==>3 */
X
X for (i = 0; i < 3; i++)
X rev_mapping [mapping[i]] = i;
X
X for (ptr = diff; ptr; ptr = D_NEXT (ptr))
X {
X char x[2];
X
X switch (ptr->correspond)
X {
X case DIFF_ALL:
X x[0] = '\0';
X dontprint = 3; /* Print them all */
X oddoneout = 3; /* Nobody's odder than anyone else */
X break;
X case DIFF_1ST:
X case DIFF_2ND:
X case DIFF_3RD:
X oddoneout = rev_mapping[(int) ptr->correspond - (int) DIFF_1ST];
X
X x[0] = oddoneout + '1';
X x[1] = '\0';
X dontprint = eliminate [oddoneout];
X break;
X default:
X fatal ("internal: Bad diff type passed to output");
X }
X fprintf (outputfile, "====%s\n", x);
X
X /* Go 0, 2, 1 if the first and third outputs are equivalent. */
X for (i = 0; i < 3;
X i = (oddoneout == 1 ? skew_increment[i] : i + 1))
X {
X int realfile = mapping[i];
X int
X lowt = D_LOWLINE (ptr, realfile),
X hight = D_HIGHLINE (ptr, realfile);
X
X fprintf (outputfile, "%d:", i + 1);
X switch (lowt - hight)
X {
X case 1:
X fprintf (outputfile, "%da\n", lowt - 1);
X break;
X case 0:
X fprintf (outputfile, "%dc\n", lowt);
X break;
X default:
X fprintf (outputfile, "%d,%dc\n", lowt, hight);
X break;
X }
X
X if (i == dontprint) continue;
X
X for (line = 0; line < hight - lowt + 1; line++)
X {
X fprintf (outputfile, " ");
X for (cp = D_RELNUM (ptr, realfile, line);
X cp < (D_RELNUM (ptr, realfile, line)
X + D_RELLEN (ptr, realfile, line));
X cp++)
X putc (*cp, outputfile);
X putc ('\n', outputfile);
X }
X }
X }
X}
X
X/*
X * This routine outputs a diff3 set of blocks as an ed script. This
X * script applies the changes between file's 2 & 3 to file 1. It
X * takes the precise format of the ed script to be output from global
X * variables set during options processing. Note that it does
X * destructive things to the set of diff3 blocks it is passed; it
X * reverses their order (this gets around the problems involved with
X * changing line numbers in an ed script).
X *
X * Note that this routine has the same problem of mapping as the last
X * one did; the variable MAPPING maps from file number according to
X * the argument list to file number according to the diff passed. All
X * files listed below are in terms of the argument list.
X *
X * Also, occasionally this routine needs the real names of the files
X * on which it works. Thus file0, file1, and file2 are the filenames
X * passed on the command line.
X *
X * See options.h for documentation on the global variables which this
X * routine pays attention to.
X */
Xvoid
Xoutput_diff3_edscript (outputfile, diff, mapping, file0, file1, file2)
X FILE *outputfile;
X struct diff3_block *diff;
X int mapping[3];
X char *file0, *file1, *file2;
X{
X int rev_mapping[3];
X int i;
X int leading_dot;
X struct diff3_block *newblock, *thisblock;
X char *cp;
X
X leading_dot = 0;
X
X for (i = 0; i < 3; i++)
X rev_mapping [mapping [i]] = i;
X
X newblock = reverse_diff3_blocklist (diff);
X
X for (thisblock = newblock; thisblock; thisblock = thisblock->next)
X {
X /* Must do mapping correctly. */
X enum diff_type type
X = ((thisblock->correspond == DIFF_ALL) ?
X DIFF_ALL :
X ((enum diff_type)
X (((int) DIFF_1ST)
X + rev_mapping [(int) thisblock->correspond - (int) DIFF_1ST])));
X
X /* If we aren't supposed to do this output block, skip it */
X if (type == DIFF_2ND || type == DIFF_1ST
X || (type == DIFF_3RD && dont_write_simple)
X || (type == DIFF_ALL && dont_write_overlap))
X continue;
X
X if (flagging && type == DIFF_ALL)
X /* Do special flagging */
X {
X overlaps++;
X /* Put in lines from FILE2 with bracket */
X fprintf (outputfile, "%da\n",
X D_HIGHLINE (thisblock, mapping [FILE0]));
X fprintf (outputfile, "=======\n");
X for (i = 0;
X i < D_NUMLINES (thisblock, mapping [FILE2]);
X i++)
X {
X if (D_RELNUM (thisblock, mapping[FILE2], i)[0] == '.')
X { leading_dot = 1; fprintf(outputfile, "."); }
X for (cp = D_RELNUM (thisblock, mapping [FILE2], i);
X cp < (D_RELNUM (thisblock, mapping [FILE2], i)
X + D_RELLEN (thisblock, mapping [FILE2], i));
X cp++)
X putc (*cp, outputfile);
X putc ('\n', outputfile);
X }
X fprintf (outputfile, ">>>>>>> %s\n.\n", file2);
X
X /* Add in code to take care of leading dots, if necessary. */
X if (leading_dot)
X {
X fprintf (outputfile, "%d,%ds/^\\.\\./\\./\n",
X D_HIGHLINE (thisblock, mapping [FILE0]) + 1,
X (D_HIGHLINE (thisblock, mapping [FILE0])
X + D_NUMLINES (thisblock, mapping [FILE2])));
X leading_dot = 0;
X }
X
X /* Put in code to do initial bracket of lines from FILE0 */
X fprintf (outputfile, "%da\n<<<<<<< %s\n.\n",
X D_LOWLINE (thisblock, mapping[FILE0]) - 1,
X file0);
X }
X else if (D_NUMLINES (thisblock, mapping [FILE2]) == 0)
X /* Write out a delete */
X {
X if (D_NUMLINES (thisblock, mapping [FILE0]) == 1)
X fprintf (outputfile, "%dd\n",
X D_LOWLINE (thisblock, mapping [FILE0]));
X else
X fprintf (outputfile, "%d,%dd\n",
X D_LOWLINE (thisblock, mapping [FILE0]),
X D_HIGHLINE (thisblock, mapping [FILE0]));
X }
X else
X /* Write out an add or change */
X {
X switch (D_NUMLINES (thisblock, mapping [FILE0]))
X {
X case 0:
X fprintf (outputfile, "%da\n",
X D_HIGHLINE (thisblock, mapping [FILE0]));
X break;
X case 1:
X fprintf (outputfile, "%dc\n",
X D_HIGHLINE (thisblock, mapping [FILE0]));
X break;
X default:
X fprintf (outputfile, "%d,%dc\n",
X D_LOWLINE (thisblock, mapping [FILE0]),
X D_HIGHLINE (thisblock, mapping [FILE0]));
X break;
X }
X for (i = 0;
X i < D_NUMLINES (thisblock, mapping [FILE2]);
X i++)
X {
X if (D_RELNUM (thisblock, mapping [FILE2], i)[0] == '.')
X { leading_dot = 1; fprintf (outputfile, "."); }
X for (cp = D_RELNUM (thisblock, mapping [FILE2], i);
X cp < (D_RELNUM (thisblock, mapping [FILE2], i)
X + D_RELLEN (thisblock, mapping [FILE2], i));
X cp++)
X putc (*cp, outputfile);
X putc ('\n', outputfile);
X }
X fprintf (outputfile, ".\n");
X
X /* Add in code to take care of leading dots, if necessary. */
X if (leading_dot)
X {
X fprintf (outputfile, "%d,%ds/^\\.\\./\\./\n",
X D_HIGHLINE (thisblock, mapping [FILE0]) + 1,
X (D_HIGHLINE (thisblock, mapping [FILE0])
X + D_NUMLINES (thisblock, mapping [FILE2])));
X leading_dot = 0;
X }
X }
X }
X if (finalwrite) fprintf (outputfile, "w\nq\n");
X}
X
X/*
X * Reverse the order of the list of diff3 blocks.
X */
Xstruct diff3_block *
Xreverse_diff3_blocklist (diff)
X struct diff3_block *diff;
X{
X register struct diff3_block *tmp, *next, *prev;
X
X for (tmp = diff, prev = (struct diff3_block *) 0;
X tmp; tmp = next)
X {
X next = tmp->next;
X tmp->next = prev;
X prev = tmp;
X }
X
X return prev;
X}
X
Xint
Xmyread (fd, ptr, size)
X int fd, size;
X char *ptr;
X{
X int result = read (fd, ptr, size);
X if (result < 0)
X perror_with_exit ("Read failed");
X return result;
X}
X
Xvoid *
Xxmalloc (size)
X int size;
X{
X void *result = (void *) calloc (1,size + 100);
X if (!result)
X fatal ("Malloc failed");
X return result;
X}
X
Xvoid *
Xxrealloc (ptr, size)
X void *ptr;
X int size;
X{
X void *result = (void *) realloc (ptr, size);
X if (!result)
X fatal ("Realloc failed\n");
X return result;
X}
X
Xvoid fatal (string)
X char *string;
X{
X printf("%s: %s\n",argv0, string);
X exit (1);
X}
Xvoid perror_with_exit (string)
X char *string;
X{
X perror (string);
X exit (1);
X}
SHAR_EOF
echo "End of archive 2 (of 14)"
# if you want to concatenate archives, remove anything after this line
exit