tools/trace-malloc/getopt.c

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5 /*
   6  * Copyright (c) 1987 Regents of the University of California.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms are permitted
  10  * provided that: (1) source distributions retain this entire copyright
  11  * notice and comment, and (2) distributions including binaries display
  12  * the following acknowledgement:  ``This product includes software
  13  * developed by the University of California, Berkeley and its contributors''
  14  * in the documentation or other materials provided with the distribution
  15  * and in all advertising materials mentioning features or use of this
  16  * software. Neither the name of the University nor the names of its
  17  * contributors may be used to endorse or promote products derived
  18  * from this software without specific prior written permission.
  19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  22  */
  23
  24 #if defined(LIBC_SCCS) && !defined(lint)
  25 static char sccsid[] = "@(#)getopt.c    4.12 (Berkeley) 6/1/90";
  26 #endif /* LIBC_SCCS and not lint */
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30 #define index strchr
  31 #define rindex strrchr
  32
  33 /*
  34  * get option letter from argument vector
  35  */
  36 int     opterr = 1,             /* if error message should be printed */
  37         optind = 1,             /* index into parent argv vector */
  38         optopt;                 /* character checked for validity */
  39 char    *optarg;                /* argument associated with option */
  40
  41 #define BADCH   (int)'?'
  42 #define EMSG    ""
  43
  44 int getopt(int nargc, char **nargv, char *ostr)
  45 {
  46         static char *place = EMSG;              /* option letter processing */
  47         register char *oli;                     /* option letter list index */
  48         char *p;
  49
  50         if (!*place) {                          /* update scanning pointer */
  51                 if (optind >= nargc || *(place = nargv[optind]) != '-') {
  52                         place = EMSG;
  53                         return(EOF);
  54                 }
  55                 if (place[1] && *++place == '-') {      /* found "--" */
  56                         ++optind;
  57                         place = EMSG;
  58                         return(EOF);
  59                 }
  60         }                                       /* option letter okay? */
  61         if ((optopt = (int)*place++) == (int)':' ||
  62             !(oli = index(ostr, optopt))) {
  63                 /*
  64                  * if the user didn't specify '-' as an option,
  65                  * assume it means EOF.
  66                  */
  67                 if (optopt == (int)'-')
  68                         return(EOF);
  69                 if (!*place)
  70                         ++optind;
  71                 if (opterr) {
  72                         if (!(p = rindex(*nargv, '/')))
  73                                 p = *nargv;
  74                         else
  75                                 ++p;
  76                         (void)fprintf(stderr, "%s: illegal option -- %c\n",
  77                             p, optopt);
  78                 }
  79                 return(BADCH);
  80         }
  81         if (*++oli != ':') {                    /* don't need argument */
  82                 optarg = NULL;
  83                 if (!*place)
  84                         ++optind;
  85         }
  86         else {                                  /* need an argument */
  87                 if (*place)                     /* no white space */
  88                         optarg = place;
  89                 else if (nargc <= ++optind) {   /* no arg */
  90                         place = EMSG;
  91                         if (!(p = rindex(*nargv, '/')))
  92                                 p = *nargv;
  93                         else
  94                                 ++p;
  95                         if (opterr)
  96                                 (void)fprintf(stderr,
  97                                     "%s: option requires an argument -- %c\n",
  98                                     p, optopt);
  99                         return(BADCH);
 100                 }
 101                 else                            /* white space */
 102                         optarg = nargv[optind];
 103                 place = EMSG;
 104                 ++optind;
 105         }
 106         return(optopt);                         /* dump back option letter */
 107 }