Ralf.Brown@B.GP.CS.CMU.EDU (04/30/89)
I grabbed this file off of comp.os.minix about 18 months ago, and it will
apply the interrupt list diffs for those who do not have "patch". The source
is followed by a uuencoded MSDOS executable--just feed this article to uudecode
to create FIX.COM.
The syntax for FIX is
fix oldfile diffs >newfile
/* fix - combine file and diff listing Author: Erik Baalbergen */
/* Notes:
* files old and old.fix are equal after the following commands
diff old new > difflist
fix old difflist > old.fix
* the diff output is assumed to be produced by my diff program.
* the difflist has the following form:
difflist ::= chunk*
chunk ::= append | delete | change ;
append ::= n1 'a' n2 [',' n3]? '\n' ['> ' line '\n'](n3 - n2 + 1)
delete ::= n1 [',' n2]? 'd' n3 '\n' ['< ' line '\n'](n2 - n1 + 1)
change ::= n1 [',' n2]? 'c' n3 [',' n4]? '\n'
['< ' line '\n'](n2 - n1 + 1)
'---\n'
['> ' line '\n'](n4 - n3 + 1)
where
- n[1234] is an unsigned integer
- "[pat](expr)" means "(expr) occurences of pat"
- "[pat]?" means "either pat or nothing"
* the information in the diff listing is checked against the file to which
it is applied; an error is printed if there is a conflict
*/
#include <stdio.h>
extern char *fgets();
extern FILE *fopen();
#define LINELEN 1024
char *prog = 0;
char *
getline(fp, b)
FILE *fp;
char *b;
{
if (fgets(b, LINELEN, fp) == NULL)
fatal("unexpected eof");
return b;
}
#define copy(str) printf("%s", str)
main(argc, argv)
char **argv;
{
char cmd, *fl, *fd, obuf[LINELEN], nbuf[LINELEN];
int o1, o2, n1, n2, here;
FILE *fpf, *fpd;
prog = argv[0];
if (argc != 3)
fatal("use: %s original-file diff-list-file", prog);
if ((fpf = fopen(argv[1], "r")) == NULL)
fatal("can't read %s", argv[1]);
if ((fpd = fopen(argv[2], "r")) == NULL)
fatal("can't read %s", argv[2]);
here = 0;
while (getcommand(fpd, &o1, &o2, &cmd, &n1, &n2)) {
while (here < o1 - 1) {
here++;
copy(getline(fpf, obuf));
}
switch (cmd) {
case 'c':
case 'd':
if (cmd == 'd' && n1 != n2)
fatal("delete count conflict");
while (o1 <= o2) {
fl = getline(fpf, obuf);
here++;
fd = getline(fpd, nbuf);
if (strncmp(fd, "< ", 2))
fatal("illegal delete line");
if (strcmp(fl, fd + 2))
fatal("delete line conflict");
o1++;
}
if (cmd == 'd')
break;
if (strcmp(getline(fpd, nbuf), "---\n"))
fatal("illegal separator in chunk");
/*FALLTHROUGH*/
case 'a':
if (cmd == 'a') {
if (o1 != o2)
fatal("append count conflict");
copy(getline(fpf, obuf));
here++;
}
while (n1 <= n2) {
if (strncmp(getline(fpd, nbuf), "> ", 2))
fatal("illegal append line");
copy(nbuf + 2);
n1++;
}
break;
}
}
while (fgets(obuf, LINELEN, fpf) != NULL)
copy(obuf);
exit(0);
}
isdigit(c)
char c;
{
return c >= '0' && c <= '9';
}
char *
range(s, p1, p2)
char *s;
int *p1, *p2;
{
register int v1 = 0, v2;
while (isdigit(*s))
v1 = 10 * v1 + *s++ - '0';
v2 = v1;
if (*s == ',') {
s++;
v2 = 0;
while (isdigit(*s))
v2 = 10 * v2 + *s++ - '0';
}
if (v1 == 0 || v2 == 0 || v1 > v2)
fatal("illegal range");
*p1 = v1;
*p2 = v2;
return s;
}
getcommand(fp, o1, o2, pcmd, n1, n2)
FILE *fp;
int *o1, *o2, *n1, *n2;
char *pcmd;
{
char buf[LINELEN];
register char *s;
char cmd;
if ((s = fgets(buf, LINELEN, fp)) == NULL)
return 0;
s = range(s, o1, o2);
if ((cmd = *s++) != 'a' && cmd != 'c' && cmd != 'd')
fatal("illegal command");
s = range(s, n1, n2);
if (*s != '\n' && s[1] != '\0')
fatal("extra characters at end of command: %s", s);
*pcmd = cmd;
return 1;
}
fatal(s, a)
char *s, *a;
{
fprintf(stderr, "%s: fatal: ", prog);
fprintf(stderr, s, a);
fprintf(stderr, "\n");
exit(1);
}
----end of fix.c----
section 1 of uuencode 2.13 of file fix.com by R.E.M.
begin 644 fix.com
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end
size 9774
--
UUCP: {ucbvax,harvard}!cs.cmu.edu!ralf -=-=-=- Voice: (412) 268-3053 (school)
ARPA: ralf@cs.cmu.edu BIT: ralf%cs.cmu.edu@CMUCCVMA FIDO: Ralf Brown 1:129/31
Disclaimer? I claimed something?
You cannot achieve the impossible without attempting the absurd.