aboutsummaryrefslogtreecommitdiff
path: root/bits/byteswap.h
diff options
context:
space:
mode:
Diffstat (limited to 'bits/byteswap.h')
-rw-r--r--bits/byteswap.h33
1 files changed, 27 insertions, 6 deletions
diff --git a/bits/byteswap.h b/bits/byteswap.h
index 04a5efe..a5dd4a7 100644
--- a/bits/byteswap.h
+++ b/bits/byteswap.h
@@ -1,5 +1,5 @@
/* Macros to swap the order of bytes in integer values.
- Copyright (C) 1997 Free Software Foundation, Inc.
+ Copyright (C) 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -22,13 +22,34 @@
#endif
/* Swap bytes in 16 bit value. */
-#define __bswap_16(x) \
- ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
+#ifdef __GNUC__
+# define __bswap_16(x) \
+ (__extension__ \
+ ({ unsigned short int __bsx = (x); \
+ ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); }))
+#else
+static __inline unsigned short int
+__bswap16 (unsigned short int x)
+{
+ return ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8));
+}
+#endif
/* Swap bytes in 32 bit value. */
-#define __bswap_32(x) \
- ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
- (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
+#ifdef __GNUC__
+# define __bswap_32(x) \
+ (__extension__ \
+ ({ unsigned int __bsx = (x); \
+ ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | \
+ (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); }))
+#else
+static __inline unsigned int
+__bswap32 (unsigned int x)
+{
+ return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) |
+ (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24));
+}
+#endif
#if defined __GNUC__ && __GNUC__ >= 2
/* Swap bytes in 64 bit value. */