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Annotation of coherent/a/tmp/smail/getopt.c, revision 1.1

1.1     ! root        1: /*
        !             2: **     @(#)getopt.c    2.5 (smail) 9/15/87
        !             3: */
        !             4: 
        !             5: /*
        !             6:  * Here's something you've all been waiting for:  the AT&T public domain
        !             7:  * source for getopt(3).  It is the code which was given out at the 1985
        !             8:  * UNIFORUM conference in Dallas.  I obtained it by electronic mail
        !             9:  * directly from AT&T.  The people there assure me that it is indeed
        !            10:  * in the public domain.
        !            11:  * 
        !            12:  * There is no manual page.  That is because the one they gave out at
        !            13:  * UNIFORUM was slightly different from the current System V Release 2
        !            14:  * manual page.  The difference apparently involved a note about the
        !            15:  * famous rules 5 and 6, recommending using white space between an option
        !            16:  * and its first argument, and not grouping options that have arguments.
        !            17:  * Getopt itself is currently lenient about both of these things White
        !            18:  * space is allowed, but not mandatory, and the last option in a group can
        !            19:  * have an argument.  That particular version of the man page evidently
        !            20:  * has no official existence, and my source at AT&T did not send a copy.
        !            21:  * The current SVR2 man page reflects the actual behavor of this getopt.
        !            22:  * However, I am not about to post a copy of anything licensed by AT&T.
        !            23:  */
        !            24: 
        !            25: /* This include is needed only to get "index" defined as "strchr" on Sys V. */
        !            26: #include "defs.h"
        !            27: 
        !            28: /*LINTLIBRARY*/
        !            29: #define NULL   0
        !            30: #define EOF    (-1)
        !            31: #define ERR(s, c)      if(opterr){\
        !            32:        extern int write();\
        !            33:        char errbuf[2];\
        !            34:        errbuf[0] = c; errbuf[1] = '\n';\
        !            35:        (void) write(2, argv[0], (unsigned)strlen(argv[0]));\
        !            36:        (void) write(2, s, (unsigned)strlen(s));\
        !            37:        (void) write(2, errbuf, 2);}
        !            38: 
        !            39: extern char *index();
        !            40: 
        !            41: int    opterr = 1;
        !            42: int    optind = 1;
        !            43: int    optopt;
        !            44: char   *optarg;
        !            45: 
        !            46: int
        !            47: getopt(argc, argv, opts)
        !            48: int    argc;
        !            49: char   **argv, *opts;
        !            50: {
        !            51:        static int sp = 1;
        !            52:        register int c;
        !            53:        register char *cp;
        !            54: 
        !            55:        if(sp == 1)
        !            56:                if(optind >= argc ||
        !            57:                   argv[optind][0] != '-' || argv[optind][1] == '\0')
        !            58:                        return(EOF);
        !            59:                else if(strcmp(argv[optind], "--") == NULL) {
        !            60:                        optind++;
        !            61:                        return(EOF);
        !            62:                }
        !            63:        optopt = c = argv[optind][sp];
        !            64:        if(c == ':' || (cp=index(opts, c)) == NULL) {
        !            65:                ERR(": illegal option -- ", c);
        !            66:                if(argv[optind][++sp] == '\0') {
        !            67:                        optind++;
        !            68:                        sp = 1;
        !            69:                }
        !            70:                return('?');
        !            71:        }
        !            72:        if(*++cp == ':') {
        !            73:                if(argv[optind][sp+1] != '\0')
        !            74:                        optarg = &argv[optind++][sp+1];
        !            75:                else if(++optind >= argc) {
        !            76:                        ERR(": option requires an argument -- ", c);
        !            77:                        sp = 1;
        !            78:                        return('?');
        !            79:                } else
        !            80:                        optarg = argv[optind++];
        !            81:                sp = 1;
        !            82:        } else {
        !            83:                if(argv[optind][++sp] == '\0') {
        !            84:                        sp = 1;
        !            85:                        optind++;
        !            86:                }
        !            87:                optarg = NULL;
        !            88:        }
        !            89:        return(c);
        !            90: }

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