Makefile: fixed compilation of tests

[libucw.git] / lib / carefulio.c

diff --git a/lib/carefulio.c b/lib/carefulio.c
index 435bd1692f2daf83c5f61a3966c53bbd94915c1e..b8d865d43a551bc13cf7f4fae068e8409bee60af 100644 (file)
--- a/lib/carefulio.c
+++ b/lib/carefulio.c
@@ -34,13 +34,13 @@ careful_read(int fd, void *buf, int len)
 }
 
 int
-careful_write(int fd, void *buf, int len)
+careful_write(int fd, const void *buf, int len)
 {
-  byte *pos = buf;
+  const byte *pos = buf;
   while (len)
     {
       int l = write(fd, pos, len);
-      if (l <= 0)
+      if (l < 0)
        return -1;
       if (!l)
        return 0;