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65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
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/* jgaa oct 9th 2000: Found this on www.
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* No copyright information given.
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* Slightly modidied.
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*
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* Origin: http://www.winsite.com/info/pc/win3/winsock/sossntr4.zip/SOSSNT/SRC/GETOPT.C.html
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*/
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/* got this off net.sources */
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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 "getopt.h"
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/*
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* get option letter from argument vector
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*/
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int opterr = 1, /* useless, never set or used */
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optind = 1, /* index into parent argv vector */
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optopt; /* character checked for validity */
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char* optarg; /* argument associated with option */
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#define BADCH (int)'?'
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#define EMSG ""
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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 getopt(int argc, char * const *argv, const char *optstring)
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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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if (*place == '-') { /* found "--" */
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++optind;
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return(EOF);
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}
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} /* option letter okay? */
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if ((optopt = (int)*place++) == (int)':' || !(oli = strchr(optstring,optopt)))
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{
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if(!*place) ++optind;
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tell(": illegal option -- ");
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}
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if (*++oli != ':') { /* don't need argument */
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optarg = NULL;
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if (!*place) ++optind;
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}
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else { /* need an argument */
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if (*place) optarg = place; /* no white space */
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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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}
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else optarg = argv[optind]; /* white space */
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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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