Implement realpath

tests/stdlib/realpath.c

@@ -0,0 +1,29 @@
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main() {
+    char* path = realpath("stdlib/realpath.c", NULL);
+    if (!path) {
+        perror("realpath");
+        return -1;
+    }
+    puts(path);
+
+    free(path);
+
+    path = malloc(PATH_MAX);
+    memset(path, 0, PATH_MAX);
+
+    realpath("stdlib/realpath.c", path);
+    if (!path) {
+        perror("realpath");
+        free(path);
+        return -1;
+    }
+    puts(path);
+
+    free(path);
+}