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Member "tin-2.4.4/src/envarg.c" (20 Nov 2019, 3510 Bytes) of package /linux/misc/tin-2.4.4.tar.xz:


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    1 /*
    2  *  Project   : tin - a Usenet reader
    3  *  Module    : envarg.c
    4  *  Author    : B. Davidson
    5  *  Created   : 1991-10-13
    6  *  Updated   : 1993-03-10
    7  *  Notes     : Adds default options from environment to command line
    8  *
    9  * Copyright (c) 1991-2020 Bill Davidson
   10  * All rights reserved.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  *
   16  * 1. Redistributions of source code must retain the above copyright notice,
   17  *    this list of conditions and the following disclaimer.
   18  *
   19  * 2. Redistributions in binary form must reproduce the above copyright
   20  *    notice, this list of conditions and the following disclaimer in the
   21  *    documentation and/or other materials provided with the distribution.
   22  *
   23  * 3. Neither the name of the copyright holder nor the names of its
   24  *    contributors may be used to endorse or promote products derived from
   25  *    this software without specific prior written permission.
   26  *
   27  * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   28  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   31  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   37  * POSSIBILITY OF SUCH DAMAGE.
   38  */
   39 
   40 
   41 #ifndef TIN_H
   42 #   include "tin.h"
   43 #endif /* !TIN_H */
   44 
   45 static int count_args(char *s);
   46 
   47 static int
   48 count_args(
   49     char *s)
   50 {
   51     int ch, count = 0;
   52 
   53     do {
   54         /*
   55          * count and skip args
   56          */
   57         ++count;
   58         while ((ch = *s) != '\0' && ch != ' ')
   59             ++s;
   60         while ((ch = *s) != '\0' && ch == ' ')
   61             ++s;
   62     } while (ch);
   63 
   64     return count;
   65 }
   66 
   67 
   68 void
   69 envargs(
   70     int *Pargc,
   71     char ***Pargv,
   72     const char *envstr)
   73 {
   74     char *envptr;           /* value returned by getenv */
   75     char *bufptr;           /* copy of env info */
   76     int argc;           /* internal arg count */
   77     int ch;             /* spare temp value */
   78     char **argv;            /* internal arg vector */
   79     char **argvect;         /* copy of vector address */
   80 
   81     /*
   82      * see if anything in the environment
   83      */
   84     envptr = getenv(envstr);
   85     if (envptr == NULL || *envptr == 0)
   86         return;
   87 
   88     /*
   89      * count the args so we can allocate room for them
   90      */
   91     argc = count_args(envptr);
   92     bufptr = my_strdup(envptr);
   93 
   94     /*
   95      * allocate a vector large enough for all args
   96      */
   97     argv = my_malloc((argc + *Pargc + 1) * sizeof(char *));
   98     argvect = argv;
   99 
  100     /*
  101      * copy the program name first, that's always true
  102      */
  103     *(argv++) = *((*Pargv)++);
  104 
  105     /*
  106      * copy the environment args first, may be changed
  107      */
  108     do {
  109         *(argv++) = bufptr;
  110         /*
  111          * skip the arg and any trailing blanks
  112          */
  113         while ((ch = *bufptr) != '\0' && ch != ' ')
  114             ++bufptr;
  115         if (ch == ' ')
  116             *(bufptr++) = '\0';
  117         while ((ch = *bufptr) != '\0' && ch == ' ')
  118             ++bufptr;
  119     } while (ch);
  120 
  121     /*
  122      * now save old argc and copy in the old args
  123      */
  124     argc += *Pargc;
  125     while (--(*Pargc))
  126         *(argv++) = *((*Pargv)++);
  127 
  128     /*
  129      * finally, add a NULL after the last arg, like UNIX
  130      */
  131     *argv = NULL;
  132 
  133     /*
  134      * save the values and return
  135      */
  136     *Pargv = argvect;
  137     *Pargc = argc;
  138 }