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/*
* From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>) Newsgroups: net.sources
* Subject: getopt library routine Date: 30 Mar 85 04:45:33 GMT
*/
/*
* getopt -- public domain version of standard System V routine
*
* Strictly enforces the System V Command Syntax Standard; provided by D A
* Gwyn of BRL for generic ANSI C implementations
*
* #define STRICT to prevent acceptance of clustered options with arguments
* and ommision of whitespace between option and arg.
*/
#include <stdio.h>
#include <string.h>
int opterr = 1; /* error => print message */
int optind = 1; /* next argv[] index */
int optopt = 1; /* Set for unknown arguments */
char *optarg = NULL; /* option parameter if any */
static int Err(name, mess, c) /* returns '?' */
char *name; /* program name argv[0] */
char *mess; /* specific message */
int c; /* defective option letter */
{
optopt = c;
if (opterr) {
(void) fprintf(stderr, "%s: %s -- %c\n", name, mess, c);
}
return '?'; /* erroneous-option marker */
}
int getopt (int argc, char *const *argv, const char *optstring)
{
static int sp = 1; /* position within argument */
register int osp; /* saved `sp' for param test */
#ifndef STRICT
register int oind; /* saved `optind' for param test */
#endif
register int c; /* option letter */
register char *cp; /* -> option in `optstring' */
optarg = NULL;
if (sp == 1) { /* fresh argument */
if (optind >= argc /* no more arguments */
|| argv[optind][0] != '-' /* no more options */
|| argv[optind][1] == '\0' /* not option; stdin */
)
return EOF;
else if (strcmp(argv[optind], "--") == 0) {
++optind; /* skip over "--" */
return EOF; /* "--" marks end of options */
}
}
c = argv[optind][sp]; /* option letter */
osp = sp++; /* get ready for next letter */
#ifndef STRICT
oind = optind; /* save optind for param test */
#endif
if (argv[optind][sp] == '\0') { /* end of argument */
++optind; /* get ready for next try */
sp = 1; /* beginning of next argument */
}
if (c == ':' || c == '?' /* optstring syntax conflict */
|| (cp = strchr(optstring, c)) == NULL /* not found */ ) {
return Err(argv[0], "illegal option", c);
}
if (cp[1] == ':') { /* option takes parameter */
#ifdef STRICT
if (osp != 1) {
return Err(argv[0], "option must not be clustered", c);
}
/* reset by end of argument */
if (sp != 1) {
return Err(argv[0], "option must be followed by white space",
c);
}
#else
if (oind == optind) { /* argument w/o whitespace */
optarg = &argv[optind][sp];
sp = 1; /* beginning of next argument */
}
else
#endif
if (optind >= argc) {
return Err(argv[0], "option requires an argument", c);
}
else /* argument w/ whitespace */
optarg = argv[optind];
++optind; /* skip over parameter */
}
return c;
}
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