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Tweak the documentation of libiberty's xcrc32 function 

libiberty/ChangeLog;

	* crc32.c: In the documentation, don't refer to GDB's
	now-nonexistent crc32 implementation.  In the table-generation
	program embedded within the documentation, change the type of
	the induction variables i and j from int to unsigned int, to
	avoid undefined behavior.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@231983 138bc75d-0d04-0410-961f-82ee72b054a4
This commit is contained in:
ppalka 2015-12-28 22:00:14 +00:00
parent aafde35e46
commit 2afaef0360
2 changed files with 13 additions and 7 deletions
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8
libiberty/ChangeLog
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@ -1,3 +1,11 @@
2015-12-28 Patrick Palka <ppalka@gcc.gnu.org>
* crc32.c: In the documentation, don't refer to GDB's
now-nonexistent crc32 implementation. In the table-generation
program embedded within the documentation, change the type of
the induction variables i and j from int to unsigned int, to
avoid undefined behavior.
2015-12-21 Nick Clifton <nickc@redhat.com> 2015-12-21 Nick Clifton <nickc@redhat.com>
PR 66827 PR 66827

12
libiberty/crc32.c
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@ -33,15 +33,14 @@
#include "libiberty.h" #include "libiberty.h"
/* This table was generated by the following program. This matches /* This table was generated by the following program.
what gdb does.
#include <stdio.h> #include <stdio.h>
int int
main () main ()
{ {
int i, j; unsigned int i, j;
unsigned int c; unsigned int c;
int table[256]; int table[256];
@ -146,10 +145,9 @@ starting value is @var{init}; this may be used to compute the CRC of
data split across multiple buffers by passing the return value of each data split across multiple buffers by passing the return value of each
call as the @var{init} parameter of the next. call as the @var{init} parameter of the next.
This is intended to match the CRC used by the @command{gdb} remote This is used by the @command{gdb} remote protocol for the @samp{qCRC}
protocol for the @samp{qCRC} command. In order to get the same command. In order to get the same results as gdb for a block of data,
results as gdb for a block of data, you must pass the first CRC you must pass the first CRC parameter as @code{0xffffffff}.
parameter as @code{0xffffffff}.
This CRC can be specified as: This CRC can be specified as: