1 /* 2 * Copyright (c) 2000, 2005 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 #include <config.h> 36 37 #include <stdio.h> 38 #include <string.h> 39 #include <ctype.h> 40 #include "roken.h" 41 42 /* find assignment in env list; len is length of variable including 43 * equal 44 */ 45 46 static int 47 find_var(char **env, char *assignment, size_t len) 48 { 49 int i; 50 for(i = 0; env != NULL && env[i] != NULL; i++) 51 if(strncmp(env[i], assignment, len) == 0) 52 return i; 53 return -1; 54 } 55 56 /* 57 * return count of environment assignments from open file F in 58 * assigned and list of malloced strings in env, return 0 or errno 59 * number 60 */ 61 62 static int 63 read_env_file(FILE *F, char ***env, int *assigned) 64 { 65 int idx = 0; 66 int i; 67 char **l; 68 char buf[BUFSIZ], *p, *r; 69 char **tmp; 70 int ret = 0; 71 72 *assigned = 0; 73 74 for(idx = 0; *env != NULL && (*env)[idx] != NULL; idx++); 75 l = *env; 76 77 /* This is somewhat more relaxed on what it accepts then 78 * Wietses sysv_environ from K4 was... 79 */ 80 while (fgets(buf, BUFSIZ, F) != NULL) { 81 buf[strcspn(buf, "#\n")] = '\0'; 82 83 for(p = buf; isspace((unsigned char)*p); p++); 84 if (*p == '\0') 85 continue; 86 87 /* Here one should check that it's a 'valid' env string... */ 88 r = strchr(p, '='); 89 if (r == NULL) 90 continue; 91 92 if((i = find_var(l, p, r - p + 1)) >= 0) { 93 char *val = strdup(p); 94 if(val == NULL) { 95 ret = ENOMEM; 96 break; 97 } 98 free(l[i]); 99 l[i] = val; 100 (*assigned)++; 101 continue; 102 } 103 104 tmp = realloc(l, (idx+2) * sizeof (char *)); 105 if(tmp == NULL) { 106 ret = ENOMEM; 107 break; 108 } 109 110 l = tmp; 111 l[idx] = strdup(p); 112 if(l[idx] == NULL) { 113 ret = ENOMEM; 114 break; 115 } 116 l[++idx] = NULL; 117 (*assigned)++; 118 } 119 if(ferror(F)) 120 ret = errno; 121 *env = l; 122 return ret; 123 } 124 125 /* 126 * return count of environment assignments from file and 127 * list of malloced strings in `env' 128 */ 129 130 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL 131 read_environment(const char *file, char ***env) 132 { 133 int assigned; 134 FILE *F; 135 136 if ((F = fopen(file, "r")) == NULL) 137 return 0; 138 139 read_env_file(F, env, &assigned); 140 fclose(F); 141 return assigned; 142 } 143 144 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL 145 free_environment(char **env) 146 { 147 int i; 148 if (env == NULL) 149 return; 150 for (i = 0; env[i]; i++) 151 free(env[i]); 152 free(env); 153 } 154