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3afb4e4e94
originally written by Henry Spencer and supplied by Harald Arnesen. git-svn-id: svn://svn.cc65.org/cc65/trunk@4737 b7a2c559-68d2-44c3-8de9-860c34a00d81
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/*
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* This is part of a changed public domain getopt implementation that
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* had the following text on top:
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*
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* I got this off net.sources from Henry Spencer.
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* It is a public domain getopt(3) like in System V.
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* I have made the following modifications:
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*
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* A test main program was added, ifdeffed by GETOPT.
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* This main program is a public domain implementation
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* of the getopt(1) program like in System V. The getopt
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* program can be used to standardize shell option handling.
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* e.g. cc -DGETOPT getopt.c -o getopt
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define ARGCH ':'
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#define BADCH '?'
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#define EMSG ""
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int opterr = 1; /* useless, never set or used */
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int optind = 1; /* index into parent argv vector */
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int optopt; /* character checked for validity */
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char *optarg; /* argument associated with option */
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#define tell(s) fputs(*argv,stderr);fputs(s,stderr); \
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fputc(optopt,stderr);fputc('\n',stderr);return(BADCH);
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int __fastcall__ getopt (int argc, char* const* argv, const char* optstring)
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/* Get option letter from argument vector */
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{
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static char *place = EMSG; /* option letter processing */
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register char *oli; /* option letter list index */
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if (!*place) { /* update scanning pointer */
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if (optind >= argc || *(place = argv[optind]) != '-' || !*++place) {
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return (EOF);
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}
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if (*place == '-') {
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/* found "--" */
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++optind;
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return (EOF);
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}
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}
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/* option letter okay? */
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if ((optopt = (int) *place++) == ARGCH ||
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!(oli = strchr (optstring, optopt))) {
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if (!*place) {
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++optind;
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}
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tell (": illegal option -- ");
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}
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if (*++oli != ARGCH) {
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/* don't need argument */
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optarg = NULL;
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if (!*place) {
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++optind;
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}
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} else {
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/* need an argument */
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if (*place) {
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/* no white space */
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optarg = place;
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}
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else if (argc <= ++optind) { /* no arg */
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place = EMSG;
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tell (": option requires an argument -- ");
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} else {
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/* white space */
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optarg = argv[optind];
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}
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place = EMSG;
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++optind;
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}
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return (optopt); /* dump back option letter */
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}
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