path: root/compat/bswap.h
AgeCommit message (Collapse)Author
2011-03-16compat: make gcc bswap an inline functionJonathan Nieder
Without this change, gcc -pedantic warns: cache.h: In function 'ce_to_dtype': cache.h:270:21: warning: ISO C forbids braced-groups within expressions [-pedantic] An inline function is more readable anyway. Signed-off-by: Jonathan Nieder <> Signed-off-by: Junio C Hamano <>
2010-03-31Don't redefine htonl and ntohl on big-endianHolger Weiß
Since commit 0fcabdeb52b79775173d009ccc179db104dfbb66, compat/bswap.h redefined htonl and ntohl to bswap32 not only if bswap32 has been defined earlier in compat/bswap.h (which is done only on selected platforms), but also if bswap32 has been defined anywhere else. This broke Git at least for NetBSD systems running on big-endian machines (where ntohl and htonl should, of course, be NOOPs), since NetBSD defines a bswap32 macro in the system headers. So, we now undefine any previously defined bswap32 in compat/bswap.h before defining our own. Signed-off-by: Holger Weiß <> Signed-off-by: Junio C Hamano <>
2009-11-25Explicitly truncate bswap operand to uint32_tBenjamin Kramer
There are some places in git where a long is passed to htonl/ntohl. llvm doesn't support matching operands of different bitwidths intentionally. This patch fixes the build with llvm-gcc (and clang) on x86_64. Signed-off-by: Benjamin Kramer <> Signed-off-by: Junio C Hamano <>
2009-10-30Use faster byte swapping when compiling with MSVCSebastian Schuberth
When compiling with MSVC on x86-compatible, use an intrinsic for byte swapping. In contrast to the GCC path, we do not prefer inline assembly here as it is not supported for the x64 platform. Signed-off-by: Sebastian Schuberth <> Signed-off-by: Junio C Hamano <>
2009-10-02Fix some printf format warningsRamsay Jones
commit 51ea551 ("make sure byte swapping is optimal for git" 2009-08-18) introduced a "sane definition for ntohl()/htonl()" for use on some GNU C platforms. Unfortunately, for some of these platforms, this results in the introduction of a problem which is essentially the reverse of a problem that commit 6e1c234 ("Fix some warnings (on cygwin) to allow -Werror" 2008-07-3) was intended to fix. In particular, on platforms where the uint32_t type is defined to be unsigned long, the return type of the new ntohl()/htonl() is causing gcc to issue printf format warnings, such as: warning: long unsigned int format, unsigned int arg (arg 3) (nine such warnings, covering six different files). The earlier commit (6e1c234) needed to suppress these same warnings, except that the types were in the opposite direction; namely the format specifier ("%u") was 'unsigned int' and the argument type (ie the return type of ntohl()) was 'long unsigned int' (aka uint32_t). In order to suppress these warnings, the earlier commit used the (C99) PRIu32 format specifier, since the definition of this macro is suitable for use with the uint32_t type on that platform. This worked because the return type of the (original) platform ntohl()/htonl() functions was uint32_t. In order to suppress these warnings, we change the return type of the new byte swapping functions in the compat/bswap.h header file from 'unsigned int' to uint32_t. Signed-off-by: Ramsay Jones <> Acked-by: Nicolas Pitre <> Signed-off-by: Jeff King <>
2009-08-18make sure byte swapping is optimal for gitNicolas Pitre
We rely on ntohl() and htonl() to perform byte swapping in many places. However, some platforms have libraries providing really poor implementations of those which might cause significant performance issues, especially with the block-sha1 code. Signed-off-by: Nicolas Pitre <> Signed-off-by: Junio C Hamano <>