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| author | Nguyễn Thái Ngọc Duy <pclouds@gmail.com> | 2010-04-14 02:15:27 +0200 |
|---|---|---|
| committer | Nguyễn Thái Ngọc Duy <pclouds@gmail.com> | 2010-09-10 18:50:00 +1000 |
| commit | 43992d86844f4fa77b6e6613ce62b96d0e115bd5 (patch) | |
| tree | b796950986f05c73256f0bace01204dec8d1e0e8 /win32/env.c | |
| parent | 22c4fb20d407f464813ce1031308bc4c6db13bb4 (diff) | |
| download | busybox-w32-43992d86844f4fa77b6e6613ce62b96d0e115bd5.tar.gz busybox-w32-43992d86844f4fa77b6e6613ce62b96d0e115bd5.tar.bz2 busybox-w32-43992d86844f4fa77b6e6613ce62b96d0e115bd5.zip | |
win32: add getenv(), setenv(), unsetenv() and clearenv()
clearenv() is not supported yet.
Diffstat (limited to 'win32/env.c')
| -rw-r--r-- | win32/env.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/win32/env.c b/win32/env.c new file mode 100644 index 000000000..376ad9d47 --- /dev/null +++ b/win32/env.c | |||
| @@ -0,0 +1,119 @@ | |||
| 1 | #include "libbb.h" | ||
| 2 | |||
| 3 | char **copy_environ(const char *const *envp) | ||
| 4 | { | ||
| 5 | char **env; | ||
| 6 | int i = 0; | ||
| 7 | while (envp[i]) | ||
| 8 | i++; | ||
| 9 | env = xmalloc((i+1)*sizeof(*env)); | ||
| 10 | for (i = 0; envp[i]; i++) | ||
| 11 | env[i] = xstrdup(envp[i]); | ||
| 12 | env[i] = NULL; | ||
| 13 | return env; | ||
| 14 | } | ||
| 15 | |||
| 16 | void free_environ(char **env) | ||
| 17 | { | ||
| 18 | int i; | ||
| 19 | for (i = 0; env[i]; i++) | ||
| 20 | free(env[i]); | ||
| 21 | free(env); | ||
| 22 | } | ||
| 23 | |||
| 24 | static int lookup_env(char **env, const char *name, size_t nmln) | ||
| 25 | { | ||
| 26 | int i; | ||
| 27 | |||
| 28 | for (i = 0; env[i]; i++) { | ||
| 29 | if (0 == strncmp(env[i], name, nmln) | ||
| 30 | && '=' == env[i][nmln]) | ||
| 31 | /* matches */ | ||
| 32 | return i; | ||
| 33 | } | ||
| 34 | return -1; | ||
| 35 | } | ||
| 36 | |||
| 37 | #undef getenv | ||
| 38 | char *mingw_getenv(const char *name) | ||
| 39 | { | ||
| 40 | char *result = getenv(name); | ||
| 41 | if (!result && !strcmp(name, "TMPDIR")) { | ||
| 42 | /* on Windows it is TMP and TEMP */ | ||
| 43 | result = getenv("TMP"); | ||
| 44 | if (!result) | ||
| 45 | result = getenv("TEMP"); | ||
| 46 | } | ||
| 47 | return result; | ||
| 48 | } | ||
| 49 | |||
| 50 | int setenv(const char *name, const char *value, int replace) | ||
| 51 | { | ||
| 52 | int out; | ||
| 53 | size_t namelen, valuelen; | ||
| 54 | char *envstr; | ||
| 55 | |||
| 56 | if (!name || !value) return -1; | ||
| 57 | if (!replace) { | ||
| 58 | char *oldval = NULL; | ||
| 59 | oldval = getenv(name); | ||
| 60 | if (oldval) return 0; | ||
| 61 | } | ||
| 62 | |||
| 63 | namelen = strlen(name); | ||
| 64 | valuelen = strlen(value); | ||
| 65 | envstr = malloc((namelen + valuelen + 2)); | ||
| 66 | if (!envstr) return -1; | ||
| 67 | |||
| 68 | memcpy(envstr, name, namelen); | ||
| 69 | envstr[namelen] = '='; | ||
| 70 | memcpy(envstr + namelen + 1, value, valuelen); | ||
| 71 | envstr[namelen + valuelen + 1] = 0; | ||
| 72 | |||
| 73 | out = putenv(envstr); | ||
| 74 | /* putenv(3) makes the argument string part of the environment, | ||
| 75 | * and changing that string modifies the environment --- which | ||
| 76 | * means we do not own that storage anymore. Do not free | ||
| 77 | * envstr. | ||
| 78 | */ | ||
| 79 | |||
| 80 | return out; | ||
| 81 | } | ||
| 82 | |||
| 83 | /* | ||
| 84 | * If name contains '=', then sets the variable, otherwise it unsets it | ||
| 85 | */ | ||
| 86 | char **env_setenv(char **env, const char *name) | ||
| 87 | { | ||
| 88 | char *eq = strchrnul(name, '='); | ||
| 89 | int i = lookup_env(env, name, eq-name); | ||
| 90 | |||
| 91 | if (i < 0) { | ||
| 92 | if (*eq) { | ||
| 93 | for (i = 0; env[i]; i++) | ||
| 94 | ; | ||
| 95 | env = xrealloc(env, (i+2)*sizeof(*env)); | ||
| 96 | env[i] = xstrdup(name); | ||
| 97 | env[i+1] = NULL; | ||
| 98 | } | ||
| 99 | } | ||
| 100 | else { | ||
| 101 | free(env[i]); | ||
| 102 | if (*eq) | ||
| 103 | env[i] = xstrdup(name); | ||
| 104 | else | ||
| 105 | for (; env[i]; i++) | ||
| 106 | env[i] = env[i+1]; | ||
| 107 | } | ||
| 108 | return env; | ||
| 109 | } | ||
| 110 | |||
| 111 | void unsetenv(const char *env) | ||
| 112 | { | ||
| 113 | env_setenv(environ, env); | ||
| 114 | } | ||
| 115 | |||
| 116 | int clearenv(void) | ||
| 117 | { | ||
| 118 | bb_error_msg_and_die("clearenv() is not supported"); | ||
| 119 | } | ||