libc: Add creat()

libs/libc/include/fcntl.h

@@ -1,6 +1,8 @@
 #ifndef _FCNTL_H
 #define _FCNTL_H
 
+#include <sys/types.h>
+
 /* Open for reading only. */
 #define O_RDONLY 1
 /* Open for writing only. */
@@ -42,6 +44,10 @@ extern "C"
     /* Opens the file specified by pathname. Returns a file descriptor on success, or -1 on error. */
     int open(const char* pathname, int flags, ...);
 
+    /* Opens the file specified by pathname, creating it if it doesn't exist or overwriting it otherwise. Calling this
+     * function is equivalent to calling open(pathname, O_WRONLY|O_CREAT|O_TRUNC, mode) */
+    int creat(const char* pathname, mode_t mode);
+
     /* Performs an operation on the file descriptor fd determined by cmd. */
     int fcntl(int fd, int cmd, ...);
 

libs/libc/src/fcntl.cpp

@@ -15,6 +15,13 @@ extern "C"
         return (int)result;
     }
 
+    int creat(const char* pathname, mode_t mode)
+    {
+        return (int)__lc_fast_syscall3(SYS_open, pathname, O_WRONLY | O_CREAT | O_TRUNC,
+                                       mode); // we don't need to pass this through to open(), we can avoid variadic
+                                              // stuff since we're sure mode exists.
+    }
+
     int fcntl(int fd, int cmd, ...)
     {
         va_list ap;