1 /* 2 * Copyright (c) 2000, 2005 Kungliga Tekniska H�gskolan 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 20866 2007-06-03 21:00:29Z lha $"); 38 #endif 39 40 #include <stdio.h> 41 #include <string.h> 42 #include <ctype.h> 43 #include "roken.h" 44 45 /* find assignment in env list; len is length of variable including 46 * equal 47 */ 48 49 static int 50 find_var(char **env, char *assignment, size_t len) 51 { 52 int i; 53 for(i = 0; env != NULL && env[i] != NULL; i++) 54 if(strncmp(env[i], assignment, len) == 0) 55 return i; 56 return -1; 57 } 58 59 /* 60 * return count of environment assignments from open file F in 61 * assigned and list of malloced strings in env, return 0 or errno 62 * number 63 */ 64 65 static int 66 rk_read_env_file(FILE *F, char ***env, int *assigned) 67 { 68 int idx = 0; 69 int i; 70 char **l; 71 char buf[BUFSIZ], *p, *r; 72 char **tmp; 73 int ret = 0; 74 75 *assigned = 0; 76 77 for(idx = 0; *env != NULL && (*env)[idx] != NULL; idx++); 78 l = *env; 79 80 /* This is somewhat more relaxed on what it accepts then 81 * Wietses sysv_environ from K4 was... 82 */ 83 while (fgets(buf, BUFSIZ, F) != NULL) { 84 buf[strcspn(buf, "#\n")] = '\0'; 85 86 for(p = buf; isspace((unsigned char)*p); p++); 87 if (*p == '\0') 88 continue; 89 90 /* Here one should check that it's a 'valid' env string... */ 91 r = strchr(p, '='); 92 if (r == NULL) 93 continue; 94 95 if((i = find_var(l, p, r - p + 1)) >= 0) { 96 char *val = strdup(p); 97 if(val == NULL) { 98 ret = ENOMEM; 99 break; 100 } 101 free(l[i]); 102 l[i] = val; 103 (*assigned)++; 104 continue; 105 } 106 107 tmp = realloc(l, (idx+2) * sizeof (char *)); 108 if(tmp == NULL) { 109 ret = ENOMEM; 110 break; 111 } 112 113 l = tmp; 114 l[idx] = strdup(p); 115 if(l[idx] == NULL) { 116 ret = ENOMEM; 117 break; 118 } 119 l[++idx] = NULL; 120 (*assigned)++; 121 } 122 if(ferror(F)) 123 ret = errno; 124 *env = l; 125 return ret; 126 } 127 128 /* 129 * return count of environment assignments from file and 130 * list of malloced strings in `env' 131 */ 132 133 int ROKEN_LIB_FUNCTION 134 read_environment(const char *file, char ***env) 135 { 136 int assigned; 137 FILE *F; 138 139 if ((F = fopen(file, "r")) == NULL) 140 return 0; 141 142 rk_read_env_file(F, env, &assigned); 143 fclose(F); 144 return assigned; 145 } 146 147 void ROKEN_LIB_FUNCTION 148 free_environment(char **env) 149 { 150 int i; 151 if (env == NULL) 152 return; 153 for (i = 0; env[i]; i++) 154 free(env[i]); 155 free(env); 156 } 157