musl - musl - an implementation of the standard library for Linux-based systems

diff --git a/src/env/setenv.c b/src/env/setenv.c
new file mode 100644
index 00000000..03e165c8
--- /dev/null
+++ b/src/env/setenv.c

@@ -0,0 +1,31 @@

+#include <stdlib.h>

+#include <string.h>

+#include <errno.h>

+

+int __putenv(char *s, int a);

+

+int setenv(const char *var, const char *value, int overwrite)

+{

+ char *s;

+ int l1, l2;

+

+ if (strchr(var, '=')) {

+ errno = EINVAL;

+ return -1;

+ }

+ if (!overwrite && getenv(var)) return 0;

+

+ l1 = strlen(var);

+ l2 = strlen(value);

+ s = malloc(l1+l2+2);

+ memcpy(s, var, l1);

+ s[l1] = '=';

+ memcpy(s+l1+1, value, l2);

+ s[l1+l2+1] = 0;

+ if (__putenv(s, 1)) {

+ free(s);

+ errno = ENOMEM;

+ return -1;

+ }

+ return 0;

+}