LibC: Implemented mkstemp in stdlib

Implemented mkstemp method in stdlib.

Libraries/LibC/stdlib.cpp

@@ -382,6 +382,17 @@ char* mktemp(char* pattern)
     return pattern;
 }
 
+int mkstemp(char* pattern)
+{
+    char* path = mktemp(pattern);
+
+    int fd = open(path, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR); // I'm using the flags I saw glibc using.
+    if (fd >= 0)
+        return fd;
+
+    return -1;
+}
+
 char* mkdtemp(char* pattern)
 {
     int length = strlen(pattern);

Libraries/LibC/stdlib.h

@@ -41,6 +41,7 @@ long labs(long);
 double atof(const char*);
 int system(const char* command);
 char* mktemp(char*);
+int mkstemp(char*);
 char* mkdtemp(char*);
 void* bsearch(const void* key, const void* base, size_t nmemb, size_t size, int (*compar)(const void*, const void*));
 size_t mbstowcs(wchar_t*, const char*, size_t);