diff options
Diffstat (limited to 'lib/roken/environment.c')
| -rw-r--r-- | lib/roken/environment.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/lib/roken/environment.c b/lib/roken/environment.c new file mode 100644 index 0000000..3822e4c --- /dev/null +++ b/lib/roken/environment.c @@ -0,0 +1,156 @@ +/* + * Copyright (c) 2000, 2005 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + + +#ifdef HAVE_CONFIG_H +#include <config.h> +RCSID("$Id: environment.c 20866 2007-06-03 21:00:29Z lha $"); +#endif + +#include <stdio.h> +#include <string.h> +#include <ctype.h> +#include "roken.h" + +/* find assignment in env list; len is length of variable including + * equal + */ + +static int +find_var(char **env, char *assignment, size_t len) +{ + int i; + for(i = 0; env != NULL && env[i] != NULL; i++) + if(strncmp(env[i], assignment, len) == 0) + return i; + return -1; +} + +/* + * return count of environment assignments from open file F in + * assigned and list of malloced strings in env, return 0 or errno + * number + */ + +static int +rk_read_env_file(FILE *F, char ***env, int *assigned) +{ + int idx = 0; + int i; + char **l; + char buf[BUFSIZ], *p, *r; + char **tmp; + int ret = 0; + + *assigned = 0; + + for(idx = 0; *env != NULL && (*env)[idx] != NULL; idx++); + l = *env; + + /* This is somewhat more relaxed on what it accepts then + * Wietses sysv_environ from K4 was... + */ + while (fgets(buf, BUFSIZ, F) != NULL) { + buf[strcspn(buf, "#\n")] = '\0'; + + for(p = buf; isspace((unsigned char)*p); p++); + if (*p == '\0') + continue; + + /* Here one should check that it's a 'valid' env string... */ + r = strchr(p, '='); + if (r == NULL) + continue; + + if((i = find_var(l, p, r - p + 1)) >= 0) { + char *val = strdup(p); + if(val == NULL) { + ret = ENOMEM; + break; + } + free(l[i]); + l[i] = val; + (*assigned)++; + continue; + } + + tmp = realloc(l, (idx+2) * sizeof (char *)); + if(tmp == NULL) { + ret = ENOMEM; + break; + } + + l = tmp; + l[idx] = strdup(p); + if(l[idx] == NULL) { + ret = ENOMEM; + break; + } + l[++idx] = NULL; + (*assigned)++; + } + if(ferror(F)) + ret = errno; + *env = l; + return ret; +} + +/* + * return count of environment assignments from file and + * list of malloced strings in `env' + */ + +int ROKEN_LIB_FUNCTION +read_environment(const char *file, char ***env) +{ + int assigned; + FILE *F; + + if ((F = fopen(file, "r")) == NULL) + return 0; + + rk_read_env_file(F, env, &assigned); + fclose(F); + return assigned; +} + +void ROKEN_LIB_FUNCTION +free_environment(char **env) +{ + int i; + if (env == NULL) + return; + for (i = 0; env[i]; i++) + free(env[i]); + free(env); +} |
