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Annotation of coherent/g/usr/lib/misc/getargs.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * getargs - get option letters and arguments from argv
        !             3:  *
        !             4:  * This is an improved form of getopt. If an option is followed
        !             5:  * by an ! it has an optional argument.
        !             6:  *     while(EOF != (c = getargs(argc, argv, "xyf:g!")))
        !             7:  * Is a call of getargs from its test section. The x and y
        !             8:  * options take no arguments. The f option takes a mandidory
        !             9:  * argument, -f arg, and -farg, are both legal forms. The g option
        !            10:  * takes an optional argument which if present must be connected
        !            11:  * -garg. Additional arguments are returned as if they were preceeded
        !            12:  * by an option of '\0'. This allows programs such as ld and as to
        !            13:  * process mixed options and file names.
        !            14:  */
        !            15: #include <stdio.h>
        !            16: 
        !            17: char   *optarg;        /* Global argument pointer. */
        !            18: int    optix = 1;      /* Global argv index. Reset to 1 to rescan. */
        !            19: 
        !            20: static char    *scan = NULL;   /* Private scan pointer. */
        !            21: extern char    *strchr();
        !            22: 
        !            23: int
        !            24: getargs(argc, argv, optstring)
        !            25: int argc;
        !            26: char *argv[];
        !            27: char *optstring;
        !            28: {
        !            29:        register char c, a;
        !            30:        register char *place;
        !            31: 
        !            32:        for (optarg = NULL; scan == NULL || !*scan; scan++, optix++) {
        !            33:                if (optix >= argc) {
        !            34:                        scan = NULL;
        !            35:                        return(EOF);
        !            36:                }
        !            37:                if (*(scan = argv[optix]) != '-') {
        !            38:                        optarg = scan;
        !            39:                        scan = NULL;
        !            40:                        optix++;
        !            41:                        return (0);
        !            42:                }
        !            43:        }
        !            44: 
        !            45:        if ((place = strchr(optstring, c = *scan++)) == NULL ||
        !            46:             c == ':' || c == '!')
        !            47:                fatal("unknown command option %c", c);
        !            48: 
        !            49:        if (((a = place[1]) == ':') || (a == '!')) {
        !            50:                if (*scan || (a == '!')) {
        !            51:                        optarg = scan;
        !            52:                        scan = NULL;
        !            53:                } else if (optix < argc)
        !            54:                        optarg = argv[optix++];
        !            55:                else
        !            56:                        fatal("command option %c missing its argument", c);
        !            57:        }
        !            58: 
        !            59:        return(c);
        !            60: }
        !            61: 
        !            62: #ifdef TEST
        !            63: /*
        !            64:  * This test example shows how to use getargs in a program.
        !            65:  * Typical test lines are
        !            66:  * getargs -fxxx -f yyy a b c -x -gabc -g
        !            67:  * getargs -xj # invalid stuff
        !            68:  */
        !            69: main(argc, argv)
        !            70: char *argv[];
        !            71: {
        !            72:        char c;
        !            73: 
        !            74:        while(EOF != (c = getargs(argc, argv, "xyf:g!"))) {
        !            75:                switch(c) {
        !            76:                case 'x':
        !            77:                case 'y':
        !            78:                        printf("option %c\n", c);
        !            79:                        break;
        !            80:                case 'g':
        !            81:                        if (*optarg)
        !            82:                                printf("option g with %s\n", optarg);
        !            83:                        else
        !            84:                                printf("option g with no argument\n");
        !            85:                        break;
        !            86:                case 'f':
        !            87:                        printf("option f with %s\n", optarg);
        !            88:                        break;
        !            89:                case 0:
        !            90:                        printf("argument '%s'\n", optarg);
        !            91:                        break;
        !            92:                default:
        !            93:                        printf(
        !            94:                "usage: getargs [-xy] [-f filen] [-g[option]] name ...\n");
        !            95:                        exit(1);
        !            96:                }
        !            97:        }
        !            98:        exit(0);
        !            99: }
        !           100: #endif

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