meta: move photon/libc to root

libc/sys/horizon/environ.c

@@ -0,0 +1,35 @@
+#include <stddef.h>
+#include <string.h>
+
+extern const char **__crt_environ();
+
+char *__crt_sys_getenv(const char *name)
+{
+    const char **envp = __crt_environ();
+
+    for (int i = 0; envp[i] != NULL; i++) {
+        int equal = -1;
+        const char *env = envp[i];
+
+        for (int ii = 0; env[ii] != '\0'; ii++) {
+            if (env[ii] == '=') {
+                equal = ii;
+                break;
+            }
+        }
+
+        if (equal == -1) {
+            continue;
+        }
+
+        char env_name[equal + 1];
+        memcpy(env_name, env, equal);
+        env_name[equal] = '\0';
+
+        if (!strcmp(env_name, name)) {
+            return (char *)(env + equal + 1);
+        }
+    }
+
+    return NULL;
+}