modules/qc/mg_getopt.c

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FUNCTIONS

This source file includes following functions.
  1. mg_new
  2. mg_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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33 
  34 /* This code has been modified from the original UC version by 
  35    Marek Bukowy, RIPE NCC
  36    to be thread-safe
  37 */
  38 
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 
  43 #include "getopt.h"
  44 
  45 getopt_state_t *
  46 mg_new(int optind)
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  47 {
  48   getopt_state_t *state;
  49 
  50   if( (state=calloc(1, sizeof(getopt_state_t))) != NULL ) {
  51     state->place = EMSG;
  52     state->optind = optind;
  53     state->optreset = 1;
  54   }
  55   return state;
  56 }
  57 
  58 
  59 /*
  60  * getopt --
  61  *      Parse argc/argv argument vector.
  62  */
  63 int
  64 mg_getopt( int            nargc,
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  65            char * const   *nargv,
  66            const char     *ostr,
  67            getopt_state_t *state)
  68 {
  69   char *oli;                              /* option letter list index */
  70 #ifdef __linux__
  71   int optopt;
  72 #endif    
  73 
  74   if (state->optreset || !*state->place) {              /* update scanning pointer */
  75     state->optreset = 0;
  76 
  77     /* handle wrongly tokenised space (grrrrr...) - skip empty fields */
  78     while(state->optind < nargc &&  *(nargv[state->optind]) == '\0') {
  79       state->optind++;
  80     }
  81     if (state->optind >= nargc || *(state->place = nargv[state->optind]) != '-') {
  82       state->place = EMSG;
  83       return (-1);
  84     }
  85     if (state->place[1] && *++(state->place) == '-') {      /* found "--" */
  86       ++state->optind;
  87       state->place = EMSG;
  88       return (-1);
  89     }
  90   }                                       /* option letter okay? */
  91   if ((state->optopt = (int)*state->place++) == (int)':' ||
  92       !(oli = strchr(ostr, state->optopt))) {
  93     /*
  94      * if the user didn't specify '-' as an option,
  95      * assume it means -1.
  96      */
  97     if (state->optopt == (int)'-')
  98       return (-1);
  99     if (!*state->place)
 100       ++state->optind;
 101     return (BADCH);
 102   }
 103   if (*++oli != ':') {                    /* don't need argument */
 104     state->optarg = NULL;
 105     if (!*state->place)
 106       ++state->optind;
 107   }
 108   else {                                  /* need an argument */
 109     if (*state->place)                     /* no white space */
 110       state->optarg = state->place;
 111     else if (nargc <= ++state->optind) {   /* no arg */
 112       state->place = EMSG;
 113       if (*ostr == ':')
 114         return (BADARG);
 115       
 116       return (BADCH);
 117     }
 118     else                            /* white space */
 119       state->optarg = nargv[state->optind];
 120     state->place = EMSG;
 121     ++state->optind;
 122   }
 123   return (state->optopt);                        /* dump back option letter */
 124 }

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