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Simtel MSDOS 1992 June
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SIMTEL_0692.cdr
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filutl
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pdtar.arc
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GETOOPT.C
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C/C++ Source or Header
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1988-05-15
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2KB
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79 lines
/*
* Plug-compatible replacement for getopt() for parsing tar-like
* arguments. If the first argument begins with "-", it uses getopt;
* otherwise, it uses the old rules used by tar, dump, and ps.
*
* Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu) and placed
* in the Pubic Domain for your edification and enjoyment.
* MS-DOS port 2/87 by Eric Roskos.
* Minix port 3/88 by Eric Roskos.
*
* @(#)getoldopt.c 1.4 2/4/86 Public Domain - gnu
*/
#include <stdio.h>
int
getoldopt(argc, argv, optstring)
int argc;
char **argv;
char *optstring;
{
extern char *optarg; /* Points to next arg */
extern int optind; /* Global argv index */
static char *key; /* Points to next keyletter */
static char use_getopt; /* !=0 if argv[1][0] was '-' */
extern char *index();
char c;
char *place;
optarg = NULL;
if (key == NULL)
{ /* First time */
if (argc < 2)
return EOF;
key = argv[1];
if (*key == '-')
use_getopt++;
else
optind = 2;
}
if (use_getopt)
return getopt(argc, argv, optstring);
c = *key++;
if (c == '\0')
{
key--;
return EOF;
}
place = index(optstring, c);
if (place == NULL || c == ':')
{
fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
return ('?');
}
place++;
if (*place == ':')
{
if (optind < argc)
{
optarg = argv[optind];
optind++;
}
else
{
fprintf(stderr, "%s: %c argument missing\n",
argv[0], c);
return ('?');
}
}
return (c);
}