Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 1 | #include <stdlib.h> |
| 2 | #include <string.h> |
| 3 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 4 | extern char** __environ; |
| 5 | char** __env_map; |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 6 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 7 | int __putenv(char* s, int a) { |
| 8 | int i = 0, j = 0; |
| 9 | char* z = strchr(s, '='); |
| 10 | char** newenv = 0; |
| 11 | char** newmap = 0; |
| 12 | static char** oldenv; |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 13 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 14 | if (!z) |
| 15 | return unsetenv(s); |
| 16 | if (z == s) |
| 17 | return -1; |
| 18 | for (; __environ[i] && memcmp(s, __environ[i], z - s + 1); i++) |
| 19 | ; |
| 20 | if (a) { |
| 21 | if (!__env_map) { |
| 22 | __env_map = calloc(2, sizeof(char*)); |
| 23 | if (__env_map) |
| 24 | __env_map[0] = s; |
| 25 | } else { |
| 26 | for (; __env_map[j] && __env_map[j] != __environ[i]; j++) |
| 27 | ; |
| 28 | if (!__env_map[j]) { |
| 29 | newmap = realloc(__env_map, sizeof(char*) * (j + 2)); |
| 30 | if (newmap) { |
| 31 | __env_map = newmap; |
| 32 | __env_map[j] = s; |
| 33 | __env_map[j + 1] = NULL; |
| 34 | } |
| 35 | } else { |
| 36 | free(__env_map[j]); |
| 37 | } |
| 38 | } |
| 39 | } |
| 40 | if (!__environ[i]) { |
| 41 | newenv = malloc(sizeof(char*) * (i + 2)); |
| 42 | if (!newenv) { |
| 43 | if (a && __env_map) |
| 44 | __env_map[j] = 0; |
| 45 | return -1; |
| 46 | } |
| 47 | memcpy(newenv, __environ, sizeof(char*) * i); |
| 48 | newenv[i] = s; |
| 49 | newenv[i + 1] = 0; |
| 50 | __environ = newenv; |
| 51 | free(oldenv); |
| 52 | oldenv = __environ; |
| 53 | } |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 54 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 55 | __environ[i] = s; |
| 56 | return 0; |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 57 | } |
| 58 | |
George Kulakowski | 17e3b04 | 2016-02-18 15:59:50 -0800 | [diff] [blame] | 59 | int putenv(char* s) { |
| 60 | return __putenv(s, 0); |
Viet-Trung Luu | 96b05c1 | 2016-01-11 11:26:36 -0800 | [diff] [blame] | 61 | } |