Prex Home / Browse Source - Prex Version: 0.9.0

root/usr/lib/libc/stdlib/getopt.c

DEFINITIONS

1. getopt

   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  */
  30 #include <unistd.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  35 int     opterr = 1,             /* if error message should be printed */
optind = 1,             /* index into parent argv vector */
optopt,                 /* character checked for validity */
optreset;               /* reset getopt */
  39 char    *optarg;                /* argument associated with option */
  41 #define BADCH   (int)'?'
  42 #define BADARG  (int)':'
  43 #define EMSG    ""
  45 /*
  46  * getopt --
  47  *      Parse argc/argv argument vector.
  48  */
  49 int
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 */
  58         if (optreset || !*place) {              /* update scanning pointer */
optreset = 0;
  60                 if (optind >= nargc || *(place = nargv[optind]) != '-') {
place = EMSG;
  62                         return (-1);
  63                 }
  64                 if (place[1] && *++place == '-') {      /* found "--" */
  65                         ++optind;
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 */
optarg = NULL;
  89                 if (!*place)
  90                         ++optind;
  91         }
  92         else {                                  /* need an argument */
  93                 if (*place)                     /* no white space */
optarg = place;
  95                 else if (nargc <= ++optind) {   /* no arg */
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",
__progname, optopt);
 104 #endif
 105                         return (BADCH);
 106                 }
 107                 else                            /* white space */
optarg = nargv[optind];
place = EMSG;
 110                 ++optind;
 111         }
 112         return (optopt);                        /* dump back option letter */
 113 }