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Usenet 1994 October
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usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso
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unix
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volume16
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pcomm2
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part04
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getopt.c
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C/C++ Source or Header
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1988-09-14
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1KB
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56 lines
/*
* Parse the command line and return option flags and arguments
*/
#include <stdio.h>
int optind = 1;
char *optarg;
int
getopt(argc, argv, opts)
int argc;
char *argv[];
char *opts;
{
static int sp = 1;
int c, strcmp();
char *cp, *strchr();
if (sp == 1) {
if (optind >= argc || argv[optind][0] != '-' || argv[optind][1] == '\0')
return(EOF);
else if (strcmp(argv[optind], "--") == NULL) {
optind++;
return(EOF);
}
}
c = argv[optind][sp];
if (c == ':' || (cp=strchr(opts, c)) == NULL) {
fprintf(stderr, "%s: illegal option '%c'\n", argv[0], c);
if (argv[optind][++sp] == '\0') {
optind++;
sp = 1;
}
return('?');
}
if (*++cp == ':') {
if (argv[optind][sp+1] != '\0')
optarg = &argv[optind++][sp+1];
else if (++optind >= argc) {
fprintf(stderr, "%s: option '%c' requires an argument\n", argv[0], c);
sp = 1;
return('?');
} else
optarg = argv[optind++];
sp = 1;
} else {
if (argv[optind][++sp] == '\0') {
sp = 1;
optind++;
}
optarg = NULL;
}
return(c);
}