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