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Annotation of pgp/src/getopt.c, revision 1.1

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

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