Category : C Source Code
Archive   : ECSTR.ZIP
Filename : GETOPT.C

 
Output of file : GETOPT.C contained in archive : ECSTR.ZIP
/* File : getopt.c
Author : Henry Spencer, University of Toronto
Updated: 28 April 1984
Purpose: get option letter from argv.
*/

#include
#include "strings.h"

char *optarg; /* Global argument pointer. */
int optind = 0; /* Global argv index. */

int getopt(argc, argv, optstring)
int argc;
char *argv[];
char *optstring;
{
register int c;
register char *place;
static char *scan = NullS; /* Private scan pointer. */

optarg = NullS;

if (scan == NullS || *scan == '\0') {
if (optind == 0) optind++;
if (optind >= argc) return EOF;
place = argv[optind];
if (place[0] != '-' || place[1] == '\0') return EOF;
optind++;
if (place[1] == '-' && place[2] == '\0') return EOF;
scan = place+1;
}

c = *scan++;
place = index(optstring, c);
if (place == NullS || c == ':') {
fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
return '?';
}
if (*++place == ':') {
if (*scan != '\0') {
optarg = scan, scan = NullS;
} else {
optarg = argv[optind], optind++;
}
}
return c;
}



  3 Responses to “Category : C Source Code
Archive   : ECSTR.ZIP
Filename : GETOPT.C

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

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