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Annotation of 43BSD/contrib/dipress/src/bin/ipf/getopt.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * getopt - get option letter from argv
        !             3:  *     This software is in the public domain
        !             4:  *     Originally written by Henry Spenser at the U. of Toronto
        !             5:  */
        !             6: 
        !             7: #include <stdio.h>
        !             8: 
        !             9: char   *optarg;        /* Global argument pointer. */
        !            10: int    optind = 0;     /* Global argv index. */
        !            11: 
        !            12: static char    *scan = NULL;   /* Private scan pointer. */
        !            13: 
        !            14: extern char    *index();
        !            15: 
        !            16: int
        !            17: getopt(argc, argv, optstring)
        !            18: int argc;
        !            19: char *argv[];
        !            20: char *optstring;
        !            21: {
        !            22:        register char c;
        !            23:        register char *place;
        !            24: 
        !            25:        optarg = NULL;
        !            26: 
        !            27:        if (scan == NULL || *scan == '\0') {
        !            28:                if (optind == 0)
        !            29:                        optind++;
        !            30:        
        !            31:                if (optind >= argc || argv[optind][0] != '-' || argv[optind][1] == '\0')
        !            32:                        return(EOF);
        !            33:                if (strcmp(argv[optind], "--")==0) {
        !            34:                        optind++;
        !            35:                        return(EOF);
        !            36:                }
        !            37:        
        !            38:                scan = argv[optind]+1;
        !            39:                optind++;
        !            40:        }
        !            41: 
        !            42:        c = *scan++;
        !            43:        place = index(optstring, c);
        !            44: 
        !            45:        if (place == NULL || c == ':') {
        !            46:                fprintf(stderr, "%s: unknown option -%c\n", argv[0], c);
        !            47:                return('?');
        !            48:        }
        !            49: 
        !            50:        place++;
        !            51:        if (*place == ':') {
        !            52:                if (*scan != '\0') {
        !            53:                        optarg = scan;
        !            54:                        scan = NULL;
        !            55:                } else {
        !            56:                        optarg = argv[optind];
        !            57:                        optind++;
        !            58:                }
        !            59:        }
        !            60: 
        !            61:        return(c);
        !            62: }

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