1 files changed, 42 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/env/setenv.c b/libc-top-half/musl/src/env/setenv.c
new file mode 100644
index 0000000..c5226b6
--- /dev/null
+++ b/libc-top-half/musl/src/env/setenv.c
@@ -0,0 +1,42 @@
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+void __env_rm_add(char *old, char *new)
+{
+	static char **env_alloced;
+	static size_t env_alloced_n;
+	for (size_t i=0; i < env_alloced_n; i++)
+		if (env_alloced[i] == old) {
+			env_alloced[i] = new;
+			free(old);
+			return;
+		} else if (!env_alloced[i] && new) {
+			env_alloced[i] = new;
+			new = 0;
+		}
+	if (!new) return;
+	char **t = realloc(env_alloced, sizeof *t * (env_alloced_n+1));
+	if (!t) return;
+	(env_alloced = t)[env_alloced_n++] = new;
+}
+
+int setenv(const char *var, const char *value, int overwrite)
+{
+	char *s;
+	size_t l1, l2;
+
+	if (!var || !(l1 = __strchrnul(var, '=') - var) || var[l1]) {
+		errno = EINVAL;
+		return -1;
+	}
+	if (!overwrite && getenv(var)) return 0;
+
+	l2 = strlen(value);
+	s = malloc(l1+l2+2);
+	if (!s) return -1;
+	memcpy(s, var, l1);
+	s[l1] = '=';
+	memcpy(s+l1+1, value, l2+1);
+	return __putenv(s, l1, s);
+}