crypto/external/bsd/heimdal/dist/lib/roken/environment.c

   1 /*      $NetBSD: environment.c,v 1.1.1.1 2011/04/13 18:15:40 elric Exp $        */
   2
   3 /*
   4  * Copyright (c) 2000, 2005 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36
  37 #include <config.h>
  38
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <ctype.h>
  42 #include <krb5/roken.h>
  43
  44 /* find assignment in env list; len is length of variable including
  45  * equal
  46  */
  47
  48 static int
  49 find_var(char **env, char *assignment, size_t len)
  50 {
  51     int i;
  52     for(i = 0; env != NULL && env[i] != NULL; i++)
  53         if(strncmp(env[i], assignment, len) == 0)
  54             return i;
  55     return -1;
  56 }
  57
  58 /*
  59  * return count of environment assignments from open file F in
  60  * assigned and list of malloced strings in env, return 0 or errno
  61  * number
  62  */
  63
  64 static int
  65 read_env_file(FILE *F, char ***env, int *assigned)
  66 {
  67     int idx = 0;
  68     int i;
  69     char **l;
  70     char buf[BUFSIZ], *p, *r;
  71     char **tmp;
  72     int ret = 0;
  73
  74     *assigned = 0;
  75
  76     for(idx = 0; *env != NULL && (*env)[idx] != NULL; idx++);
  77     l = *env;
  78
  79     /* This is somewhat more relaxed on what it accepts then
  80      * Wietses sysv_environ from K4 was...
  81      */
  82     while (fgets(buf, BUFSIZ, F) != NULL) {
  83         buf[strcspn(buf, "#\n")] = '\0';
  84
  85         for(p = buf; isspace((unsigned char)*p); p++);
  86         if (*p == '\0')
  87             continue;
  88
  89         /* Here one should check that it's a 'valid' env string... */
  90         r = strchr(p, '=');
  91         if (r == NULL)
  92             continue;
  93
  94         if((i = find_var(l, p, r - p + 1)) >= 0) {
  95             char *val = strdup(p);
  96             if(val == NULL) {
  97                 ret = ENOMEM;
  98                 break;
  99             }
 100             free(l[i]);
 101             l[i] = val;
 102             (*assigned)++;
 103             continue;
 104         }
 105
 106         tmp = realloc(l, (idx+2) * sizeof (char *));
 107         if(tmp == NULL) {
 108             ret = ENOMEM;
 109             break;
 110         }
 111
 112         l = tmp;
 113         l[idx] = strdup(p);
 114         if(l[idx] == NULL) {
 115             ret = ENOMEM;
 116             break;
 117         }
 118         l[++idx] = NULL;
 119         (*assigned)++;
 120     }
 121     if(ferror(F))
 122         ret = errno;
 123     *env = l;
 124     return ret;
 125 }
 126
 127 /*
 128  * return count of environment assignments from file and
 129  * list of malloced strings in `env'
 130  */
 131
 132 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
 133 read_environment(const char *file, char ***env)
 134 {
 135     int assigned;
 136     FILE *F;
 137
 138     if ((F = fopen(file, "r")) == NULL)
 139         return 0;
 140
 141     read_env_file(F, env, &assigned);
 142     fclose(F);
 143     return assigned;
 144 }
 145
 146 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
 147 free_environment(char **env)
 148 {
 149     int i;
 150     if (env == NULL)
 151         return;
 152     for (i = 0; env[i]; i++)
 153         free(env[i]);
 154     free(env);
 155 }