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
  58 /*****************************************************************************
  59
  60     NAME */
  61
  62         int getopt(
  63
  64 /*  SYNOPSIS */
  65         int nargc,
  66         char * const nargv[],
  67         const char *ostr)
  68
  69 /*  FUNCTION
  70
  71     INPUTS
  72
  73     RESULT
  74
  75     NOTES
  76
  77     EXAMPLE
  78
  79     BUGS
  80
  81     SEE ALSO
  82
  83     INTERNALS
  84
  85 ******************************************************************************/
  86 {
  87     static char *place = EMSG;          /* option letter processing */
  88     char *oli;                          /* option letter list index */
  89
  90     if (optreset || *place == 0)
  91     {
  92         /* update scanning pointer */
  93         optreset = 0;
  94         place = nargv[optind];
  95         if (optind >= nargc || *place++ != '-')
  96         {
  97             /* Argument is absent or is not an option */
  98             place = EMSG;
  99             return (-1);
 100         }
 101         optopt = *place++;
 102         if (optopt == '-' && *place == 0)
 103         {
 104             /* "--" => end of options */
 105             ++optind;
 106             place = EMSG;
 107             return (-1);
 108         }
 109         if (optopt == 0)
 110         {
 111             /* Solitary '-', treat as a '-' option
 112              if the program (eg su) is looking for it. */
 113             place = EMSG;
 114             if (strchr(ostr, '-') == NULL)
 115                 return (-1);
 116             optopt = '-';
 117         }
 118     }
 119     else
 120         optopt = *place++;
 121
 122     /* See if option letter is one the caller wanted... */
 123     if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL)
 124     {
 125         if (*place == 0)
 126             ++optind;
 127         if (opterr && *ostr != ':')
 128             fprintf(stderr,
 129                     "%s: illegal option -- %c\n", nargv[0],
 130                     optopt
 131             );
 132         return (BADCH);
 133     }
 134
 135     /* Does this option need an argument? */
 136     if (oli[1] != ':')
 137     {
 138         /* don't need argument */
 139         optarg = NULL;
 140         if (*place == 0)
 141             ++optind;
 142     }
 143     else
 144     {
 145         /* Option-argument is either the rest of this argument or the
 146            entire next argument. */
 147         if (*place)
 148             optarg = place;
 149         else if (nargc > ++optind)
 150             optarg = nargv[optind];
 151         else
 152         {
 153             /* option-argument absent */
 154             place = EMSG;
 155             if (*ostr == ':')
 156                 return (BADARG);
 157             if (opterr)
 158                 (void)fprintf(stderr,
 159                               "%s: option requires an argument -- %c\n",
 160                               nargv[0], optopt
 161                 );
 162             return (BADCH);
 163         }
 164         place = EMSG;
 165         ++optind;
 166     }
 167     return (optopt);                    /* return option letter */
 168 }
 169