mescc: Add fopen.

[mes.git] / lib / libc.c

diff --git a/lib/libc.c b/lib/libc.c
index 40be8a449826e6db2d79195ae20ab5f287515f6b..7f0bf1c12c2aaad088e06a2b24fa26a6a200124d 100644 (file)
--- a/lib/libc.c
+++ b/lib/libc.c
@@ -1,6 +1,7 @@
 /* -*-comment-start: "//";comment-end:""-*-
  * Mes --- Maxwell Equations of Software
- * Copyright © 2016,2017 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ * Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ * Copyright © 2018 Jeremiah Orians <jeremiah@pdp10.guru>
  *
  * This file is part of Mes.
  *
@@ -174,6 +175,24 @@ eputc (int c)
   return fdputc (c, STDERR);
 }
 
+FILE*
+fopen (char const* file_name, char const* mode)
+{
+  FILE* f;
+  if ('w' == mode[0])
+    /* 577 is O_WRONLY|O_CREAT|O_TRUNC, 384 is 600 in octal */
+    f = open (file_name, 577 , 384);
+  else
+    /* Everything else is a read */
+    f = open (file_name, 0, 0);
+
+  /* Negative numbers are error codes */
+  if (0 > f)
+    return 0;
+
+  return f;
+}
+
 int
 putchar (int c)
 {