lib/roken/getopt.c

   1 /*
   2  * Copyright (c) 1987, 1993
   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 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)getopt.c    8.1 (Berkeley) 6/4/93";
  32 #endif /* LIBC_SCCS and not lint */
  33
  34 #ifndef __STDC__
  35 #define const
  36 #endif
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40
  41 /*
  42  * get option letter from argument vector
  43  */
  44 int     opterr = 1,             /* if error message should be printed */
  45         optind = 1,             /* index into parent argv vector */
  46         optopt,                 /* character checked for validity */
  47         optreset;               /* reset getopt */
  48 char    *optarg;                /* argument associated with option */
  49
  50 #define BADCH   (int)'?'
  51 #define BADARG  (int)':'
  52 #define EMSG    ""
  53
  54 int ROKEN_LIB_FUNCTION
  55 getopt(nargc, nargv, ostr)
  56         int nargc;
  57         char * const *nargv;
  58         const char *ostr;
  59 {
  60         static char *place = EMSG;              /* option letter processing */
  61         char *oli;                      /* option letter list index */
  62         char *p;
  63
  64         if (optreset || !*place) {              /* update scanning pointer */
  65                 optreset = 0;
  66                 if (optind >= nargc || *(place = nargv[optind]) != '-') {
  67                         place = EMSG;
  68                         return(-1);
  69                 }
  70                 if (place[1] && *++place == '-') {      /* found "--" */
  71                         ++optind;
  72                         place = EMSG;
  73                         return(-1);
  74                 }
  75         }                                       /* option letter okay? */
  76         if ((optopt = (int)*place++) == (int)':' ||
  77             !(oli = strchr(ostr, optopt))) {
  78                 /*
  79                  * if the user didn't specify '-' as an option,
  80                  * assume it means -1 (EOF).
  81                  */
  82                 if (optopt == (int)'-')
  83                         return(-1);
  84                 if (!*place)
  85                         ++optind;
  86                 if (opterr && *ostr != ':') {
  87                         if (!(p = strrchr(*nargv, '/')))
  88                                 p = *nargv;
  89                         else
  90                                 ++p;
  91                         fprintf(stderr, "%s: illegal option -- %c\n",
  92                             p, optopt);
  93                 }
  94                 return(BADCH);
  95         }
  96         if (*++oli != ':') {                    /* don't need argument */
  97                 optarg = NULL;
  98                 if (!*place)
  99                         ++optind;
 100         }
 101         else {                                  /* need an argument */
 102                 if (*place)                     /* no white space */
 103                         optarg = place;
 104                 else if (nargc <= ++optind) {   /* no arg */
 105                         place = EMSG;
 106                         if (!(p = strrchr(*nargv, '/')))
 107                                 p = *nargv;
 108                         else
 109                                 ++p;
 110                         if (*ostr == ':')
 111                                 return(BADARG);
 112                         if (opterr)
 113                                 fprintf(stderr,
 114                                     "%s: option requires an argument -- %c\n",
 115                                     p, optopt);
 116                         return(BADCH);
 117                 }
 118                 else                            /* white space */
 119                         optarg = nargv[optind];
 120                 place = EMSG;
 121                 ++optind;
 122         }
 123         return(optopt);                         /* dump back option letter */
 124 }