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Unified Diff: fusl/src/env/unsetenv.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: fusl/src/env/unsetenv.c
diff --git a/fusl/src/env/unsetenv.c b/fusl/src/env/unsetenv.c
new file mode 100644
index 0000000000000000000000000000000000000000..356933546a31a41ad859c3bc08709aa76a5a2644
--- /dev/null
+++ b/fusl/src/env/unsetenv.c
@@ -0,0 +1,31 @@
+#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;
+}
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