modules/qc/mg_getopt.c

/* [<][>]
[^][v][top][bottom][index][help] */

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 "rip.h"
  40 
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 
  45 getopt_state_t *
  46 mg_new(int optind)
     /* [<][>][^][v][top][bottom][index][help] */
  47 {
  48   getopt_state_t *state;
  49 
  50   if( (state=UT_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,
     /* [<][>][^][v][top][bottom][index][help] */
  65            char * const   *nargv,
  66            const char     *ostr,
  67            getopt_state_t *state)
  68 {
  69   char *oli;                              /* option letter list index */
  70 
  71   if (state->optreset || !*state->place) {              /* update scanning pointer */
  72     state->optreset = 0;
  73 
  74     /* handle wrongly tokenised space (grrrrr...) - skip empty fields */
  75     while(state->optind < nargc &&  *(nargv[state->optind]) == '\0') {
  76       state->optind++;
  77     }
  78     if (state->optind >= nargc || *(state->place = nargv[state->optind]) != '-') {
  79       state->place = EMSG;
  80       return (-1);
  81     }
  82     if (state->place[1] && *++(state->place) == '-') {      /* found "--" */
  83       ++state->optind;
  84       state->place = EMSG;
  85       return (-1);
  86     }
  87   }                                       /* option letter okay? */
  88   if ((state->optopt = (int)*state->place++) == (int)':' ||
  89       !(oli = strchr(ostr, state->optopt))) {
  90     /*
  91      * if the user didn't specify '-' as an option,
  92      * assume it means -1.
  93      */
  94     if (state->optopt == (int)'-')
  95       return (-1);
  96     if (!*state->place)
  97       ++state->optind;
  98     return (BADCH);
  99   }
 100   if (*++oli != ':') {                    /* don't need argument */
 101     state->optarg = NULL;
 102     if (!*state->place)
 103       ++state->optind;
 104   }
 105   else {                                  /* need an argument */
 106     if (*state->place)                     /* no white space */
 107       state->optarg = state->place;
 108     else if (nargc <= ++state->optind) {   /* no arg */
 109       state->place = EMSG;
 110       if (*ostr == ':')
 111         return (BADARG);
 112       
 113       return (BADCH);
 114     }
 115     else                            /* white space */
 116       state->optarg = nargv[state->optind];
 117     state->place = EMSG;
 118     ++state->optind;
 119   }
 120   return (state->optopt);                        /* dump back option letter */
 121 }

/* [<][>][^][v][top][bottom][index][help] */