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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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vol_200
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264_01
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globargs.c
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/*
* globargs.c
* Link with getdir.asm to form a command line argument wildcard expander
* for Manx Aztec C86.
* Rename the real main() to _main().
*
* David MacKenzie
* Latest revision: 05/08/88
*/
#include <stdio.h>
#include "getdir.h"
/* Arbitrary internal limit on filename path length. */
#define MAXPATH 125
/* Granularity with which space for argv is allocated. */
#define ARG_INCR 10
char *
malloc(), *realloc();
/*
* Return a pointer to the last element of the given path.
*/
char *
basename(p)
char *p;
{
char *tail;
for (tail = p; *p; ++p)
if (*p == ':' || *p == '\\')
tail = p + 1;
return tail;
}
static void
overflow()
{
fprintf(stderr, "Too many arguments.\n");
exit(1);
}
static char **
initargv()
{
char **argv;
argv = (char **) malloc(ARG_INCR * sizeof(char **));
if (!argv)
overflow();
return argv;
}
/*
* Return ptr to a copy of s in newly allocated memory.
*/
static char *
savestr(s)
char *s;
{
char *t;
t = malloc(strlen(s) + 1);
if (!t)
overflow();
(void) strcpy(t, s);
return t;
}
/*
* Save arg at position argc in array argv.
*/
static char **
savearg(arg, argv, argc, alloc)
char *arg;
char **argv;
int argc;
int alloc; /* If true, allocate mem, otherwise copy ptr. */
{
if (argc > 0 && argc % ARG_INCR == 0) {
argv = (char **) realloc(argv, (argc + ARG_INCR) * sizeof(char **));
if (!argv)
overflow();
}
argv[argc] = alloc ? savestr(arg) : arg;
return argv;
}
main(argc, argv, envp)
int argc;
char **argv;
char **envp;
{
char dirbuf[512]; /* Buffer for disk input. */
struct ffblk *dir = (struct ffblk *) dirbuf;
char pathbuf[MAXPATH]; /* Path of globbed arguments. */
char *tail; /* Tail component of pathbuf. */
int nargc;
char **nargv;
int optind;
setdta(dirbuf); /* Set disk transfer area. */
nargc = 0;
nargv = initargv();
for (optind = 0; optind < argc; ++optind) {
if (!index(argv[optind], '*') && !index(argv[optind], '?'))
nargv = savearg(argv[optind], nargv, nargc++, 0);
else if (!getfirst(argv[optind], FA_NORMAL | FA_DIREC)) {
/*
* Copy any leading drive and/or path into pathbuf because the
* MS-DOS globbing routines return only the base of the
* filenames.
*/
(void) strcpy(pathbuf, argv[optind]);
tail = basename(pathbuf);
do {
if (dir->ff_fname[0] != '.') {
(void) strcpy(tail, dir->ff_fname);
nargv = savearg(pathbuf, nargv, nargc++, 1);
}
} while (!getnext(argv[optind], FA_NORMAL | FA_DIREC));
} else {
fprintf(stderr, "No match.\n");
exit(1);
}
}
/* Some programs expect that argv[argc] is NULL. */
nargv = savearg(NULL, nargv, nargc, 0);
_main(nargc, nargv, envp);
}