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Annotation of prex/usr/lib/libc/stdlib/getopt.c, Revision 1.1

1.1     ! nbrk        1: /*
        !             2:  * Copyright (c) 1987, 1993, 1994
        !             3:  *     The Regents of the University of California.  All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the University nor the names of its contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: #include <unistd.h>
        !            31: #include <stdio.h>
        !            32: #include <stdlib.h>
        !            33: #include <string.h>
        !            34:
        !            35: int    opterr = 1,             /* if error message should be printed */
        !            36:        optind = 1,             /* index into parent argv vector */
        !            37:        optopt,                 /* character checked for validity */
        !            38:        optreset;               /* reset getopt */
        !            39: char   *optarg;                /* argument associated with option */
        !            40:
        !            41: #define        BADCH   (int)'?'
        !            42: #define        BADARG  (int)':'
        !            43: #define        EMSG    ""
        !            44:
        !            45: /*
        !            46:  * getopt --
        !            47:  *     Parse argc/argv argument vector.
        !            48:  */
        !            49: int
        !            50: getopt(int nargc, char * const nargv[], const char *ostr)
        !            51: {
        !            52: #if 0
        !            53:        extern char *__progname;
        !            54: #endif
        !            55:        static char *place = EMSG;              /* option letter processing */
        !            56:        char *oli;                              /* option letter list index */
        !            57:
        !            58:        if (optreset || !*place) {              /* update scanning pointer */
        !            59:                optreset = 0;
        !            60:                if (optind >= nargc || *(place = nargv[optind]) != '-') {
        !            61:                        place = EMSG;
        !            62:                        return (-1);
        !            63:                }
        !            64:                if (place[1] && *++place == '-') {      /* found "--" */
        !            65:                        ++optind;
        !            66:                        place = EMSG;
        !            67:                        return (-1);
        !            68:                }
        !            69:        }                                       /* option letter okay? */
        !            70:        if ((optopt = (int)*place++) == (int)':' ||
        !            71:            !(oli = strchr(ostr, optopt))) {
        !            72:                /*
        !            73:                 * if the user didn't specify '-' as an option,
        !            74:                 * assume it means -1.
        !            75:                 */
        !            76:                if (optopt == (int)'-')
        !            77:                        return (-1);
        !            78:                if (!*place)
        !            79:                        ++optind;
        !            80: #if 0
        !            81:                if (opterr && *ostr != ':')
        !            82:                        (void)fprintf(stderr,
        !            83:                            "%s: illegal option -- %c\n", __progname, optopt);
        !            84: #endif
        !            85:                return (BADCH);
        !            86:        }
        !            87:        if (*++oli != ':') {                    /* don't need argument */
        !            88:                optarg = NULL;
        !            89:                if (!*place)
        !            90:                        ++optind;
        !            91:        }
        !            92:        else {                                  /* need an argument */
        !            93:                if (*place)                     /* no white space */
        !            94:                        optarg = place;
        !            95:                else if (nargc <= ++optind) {   /* no arg */
        !            96:                        place = EMSG;
        !            97:                        if (*ostr == ':')
        !            98:                                return (BADARG);
        !            99: #if 0
        !           100:                        if (opterr)
        !           101:                                (void)fprintf(stderr,
        !           102:                                    "%s: option requires an argument -- %c\n",
        !           103:                                    __progname, optopt);
        !           104: #endif
        !           105:                        return (BADCH);
        !           106:                }
        !           107:                else                            /* white space */
        !           108:                        optarg = nargv[optind];
        !           109:                place = EMSG;
        !           110:                ++optind;
        !           111:        }
        !           112:        return (optopt);                        /* dump back option letter */
        !           113: }