richardh@killer.UUCP (Richard Hargrove) (08/01/87)
For those who need a way to expand wid-card filespec command line
arguments in Turbo C, see below. The only known problem is that
there is no way to get the string "*.*" into the program code (or
any string containing wild-card characters that match a filespec)
because the quoting supported in c0.asm has already been stripped
off. I think that is a very minor problem and is easily solved in
the user's code.
save as exparg.h:
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/* exparg.h header file for exparg(), the routine that performs
* wild-card expansion on filespecs in the command line
* parameters
*/
#ifndef EXP_ARG
#define EXP_ARG
char **exparg (int *pargc, char *argv []);
#endif
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save as exparg.c:
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/* exparg.c source code for exparg()
*/
/******************************************************************************
NAME exparg - expand filespec command line parameters
containing wild-card characters
USAGE #include "exparg.h"
char **exparg (int *pargc, char *argv []);
PROTOTYPE IN exparg.h
DESCRIPTION Exparg is used to explicitly process the filespec
command line parameters containing wild-card
characters. It takes a pointer to an integer
containing the count of the parameters and a pointer
to an array of pointers to the strings copied from
the comamnd line. It is anticipated that most of the
time exparg() will be called immediately upon entry
to main(), with the call looking like
argv = exparg (&argc, argv);
See the test program included in this file for an
example usage.
When exparg() finds a filespec parameter string
containing wild-card characters, it replaces the
string with the name of the first file that matches
it and adds the names of subsequent matches to the
list of parameter string pointers. If no matching file
names are found, the original string is left in place.
Upon return from exparg() argc will be updated to
indicate the new number of command line parameters
and argv will point to a different array of string
pointers. Command line parameter processing can then
proceed as it would have been done before.
RETURN VALUE A pointer to an array of string pointers that point
to the expanded filespec command line parameters. The
int containing the parameter count is modified as a
side-affect.
PORTABILITY MS-DOS specific, Turbo-C specific
AUTHOR Richard Hargrove
Texas Instruments, Inc.
P.O. Box 869305, m/s 8473
Plano, Texas 75086
214/575-4128
*****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <dir.h>
#include <dos.h>
#include <alloc.h>
#define MAXARGS 100 /* maximum number of entries the new argv */
/* array can contain */
#define TRUE 1
#define FALSE 0
#define NIL(type) ((type *) NULL)
typedef int BOOLEAN;
/*****************************************************************************/
char **exparg (int *pargc, char *argv [])
{
static char *newargv [MAXARGS];
char path [MAXPATH]; /* if the stack doesn't overflow, */
char drive [MAXDRIVE]; /* we have less lasting impact */
char dir [MAXDIR]; /* on the static data segment */
char far *olddta = getdta ();
struct ffblk fblk;
register int args = 0;
register int newargc = 0;
BOOLEAN err = FALSE;
while (!err && args < *pargc) {
if ((fnsplit(argv[args],drive,dir,NIL(char),NIL(char))& WILDCARDS) &&
(!findfirst (argv [args], &fblk, 0))) {
do {
char *localcptr = (char *)malloc (
(unsigned)(stpcpy (stpcpy (stpcpy (path, drive),
dir),
fblk.ff_name) - path) + 1);
if (localcptr != NIL(char)) {
newargv [newargc++] = strcpy (localcptr, path);
}
else {
fputs ("\n_exparg error : no memory for filenames\n", stderr);
exit (1);
}
} while ((newargc < MAXARGS) && !findnext (&fblk));
}
else {
newargv [newargc++] = argv [args];
}
err = (newargc == MAXARGS);
args++;
}
if (err) fputs ("\n_exparg error : too many filenames\n", stderr);
setdta (olddta);
*pargc = newargc;
return (&newargv [0]);
}
#ifdef TEST
/*****************************************************************************/
main (int argc, char *argv [])
{
/* test exparg()
*/
int i = 0;
printf ("original command line parameters : argc: %d\n", argc);
for (; i < argc; i++) {
printf ("%s\n", argv [i]);
}
argv = exparg (&argc, argv);
printf ("new command line parameters : argc: %d\n", argc);
for (i = 0; i < argc; i++) {
printf ("%s\n", argv [i]);
}
}
#endif
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enjoy,
richard hargrove
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cis: 74756,664
usenet: ...!killer!xenixwar!richardh
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