diff options
author | pommicket <pommicket@gmail.com> | 2022-02-20 13:18:21 -0800 |
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committer | pommicket <pommicket@gmail.com> | 2022-02-20 13:18:21 -0800 |
commit | 9bc8a11afeed3569736b89754012e3ca22ee10f6 (patch) | |
tree | 5f0ec0d5c05f879b1ee86adfa654ed3ef2178d5f /05/musl-0.6.0/src/env/unsetenv.c | |
parent | 0f97a589b800bdb71dda05984192f0f66a52edaa (diff) |
conclusion
Diffstat (limited to '05/musl-0.6.0/src/env/unsetenv.c')
-rw-r--r-- | 05/musl-0.6.0/src/env/unsetenv.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/05/musl-0.6.0/src/env/unsetenv.c b/05/musl-0.6.0/src/env/unsetenv.c new file mode 100644 index 0000000..7493d97 --- /dev/null +++ b/05/musl-0.6.0/src/env/unsetenv.c @@ -0,0 +1,32 @@ +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> + +extern char **__environ; +extern char **__env_map; + +int unsetenv(const char *name) +{ + int i, j; + size_t l = strlen(name); + + if (!*name || strchr(name, '=')) { + errno = EINVAL; + return -1; + } +again: + for (i=0; __environ[i] && (memcmp(name, __environ[i], l) || __environ[i][l] != '='); i++); + if (__environ[i]) { + if (__env_map) { + for (j=0; __env_map[j] && __env_map[j] != __environ[i]; j++); + free (__env_map[j]); + for (; __env_map[j]; j++) + __env_map[j] = __env_map[j+1]; + } + for (; __environ[i]; i++) + __environ[i] = __environ[i+1]; + goto again; + } + return 0; +} |