crypto/heimdal-0.6.3/lib/roken/environment.c

   1 /*
   2  * Copyright (c) 2000 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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
  35 #ifdef HAVE_CONFIG_H
  36 #include <config.h>
  37 RCSID("$Id: environment.c,v 1.1 2000/06/21 02:05:03 assar Exp $");
  38 #endif
  39
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include "roken.h"
  43
  44 /*
  45  * return count of environment assignments from `file' and
  46  * list of malloced strings in `env'
  47  */
  48
  49 int
  50 read_environment(const char *file, char ***env)
  51 {
  52     int i, k;
  53     FILE *F;
  54     char **l;
  55     char buf[BUFSIZ], *p, *r;
  56
  57     if ((F = fopen(file, "r")) == NULL) {
  58         return 0;
  59     }
  60
  61     i = 0;
  62     if (*env) {
  63         l = *env;
  64         while (*l != NULL) {
  65             i++;
  66             l++;
  67         }
  68     }
  69     l = *env;
  70     /* This is somewhat more relaxed on what it accepts then
  71      * Wietses sysv_environ from K4 was...
  72      */
  73     while (fgets(buf, BUFSIZ, F) != NULL) {
  74         if (buf[0] == '#')
  75             continue;
  76
  77         p = strchr(buf, '#');
  78         if (p != NULL)
  79             *p = '\0';
  80
  81         p = buf;
  82         while (*p == ' ' || *p == '\t' || *p == '\n') p++;
  83         if (*p == '\0')
  84             continue;
  85
  86         k = strlen(p);
  87         if (p[k-1] == '\n')
  88             p[k-1] = '\0';
  89
  90         /* Here one should check that is is a 'valid' env string... */
  91         r = strchr(p, '=');
  92         if (r == NULL)
  93             continue;
  94
  95         l = realloc(l, (i+1) * sizeof (char *));
  96         l[i++] = strdup(p);
  97     }
  98     fclose(F);
  99     l = realloc(l, (i+1) * sizeof (char *));
 100     l[i] = NULL;
 101     *env = l;
 102     return i;
 103 }