compiler/clib/getopt.c

   1 /* File imported from FreeBSD source into AROS */
   2
   3 /*
   4  * Copyright (c) 1987, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43 int     opterr = 1,             /* if error message should be printed */
  44         optind = 1,             /* index into parent argv vector */
  45         optopt,                 /* character checked for validity */
  46         optreset;               /* reset getopt */
  47 char    *optarg;                /* argument associated with option */
  48
  49 #define BADCH   (int)'?'
  50 #define BADARG  (int)':'
  51 #define EMSG    ""
  52
  53 /*
  54  * getopt --
  55  *      Parse argc/argv argument vector.
  56  */
  57 int
  58 getopt(int nargc,
  59        char * const nargv[],
  60        const char *ostr
  61 )
  62 {
  63     static char *place = EMSG;          /* option letter processing */
  64     char *oli;                          /* option letter list index */
  65
  66     if (optreset || *place == 0)
  67     {
  68         /* update scanning pointer */
  69         optreset = 0;
  70         place = nargv[optind];
  71         if (optind >= nargc || *place++ != '-')
  72         {
  73             /* Argument is absent or is not an option */
  74             place = EMSG;
  75             return (-1);
  76         }
  77         optopt = *place++;
  78         if (optopt == '-' && *place == 0)
  79         {
  80             /* "--" => end of options */
  81             ++optind;
  82             place = EMSG;
  83             return (-1);
  84         }
  85         if (optopt == 0)
  86         {
  87             /* Solitary '-', treat as a '-' option
  88              if the program (eg su) is looking for it. */
  89             place = EMSG;
  90             if (strchr(ostr, '-') == NULL)
  91                 return (-1);
  92             optopt = '-';
  93         }
  94     }
  95     else
  96         optopt = *place++;
  97
  98     /* See if option letter is one the caller wanted... */
  99     if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL)
 100     {
 101         if (*place == 0)
 102             ++optind;
 103 #warning FIXME: Implement progname in error output
 104         if (opterr && *ostr != ':')
 105             fprintf(stderr,
 106                     "%s: illegal option -- %c\n", "???Prog",
 107                     optopt
 108             );
 109         return (BADCH);
 110     }
 111
 112     /* Does this option need an argument? */
 113     if (oli[1] != ':')
 114     {
 115         /* don't need argument */
 116         optarg = NULL;
 117         if (*place == 0)
 118             ++optind;
 119     }
 120     else
 121     {
 122         /* Option-argument is either the rest of this argument or the
 123            entire next argument. */
 124         if (*place)
 125             optarg = place;
 126         else if (nargc > ++optind)
 127             optarg = nargv[optind];
 128         else
 129         {
 130             /* option-argument absent */
 131             place = EMSG;
 132             if (*ostr == ':')
 133                 return (BADARG);
 134             if (opterr)
 135                 (void)fprintf(stderr,
 136                               "%s: option requires an argument -- %c\n",
 137                               "???Prog", optopt
 138                 );
 139             return (BADCH);
 140         }
 141         place = EMSG;
 142         ++optind;
 143     }
 144     return (optopt);                    /* return option letter */
 145 }