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author | Ulrich Drepper <drepper@redhat.com> | 2001-02-10 16:37:51 +0000 |
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committer | Ulrich Drepper <drepper@redhat.com> | 2001-02-10 16:37:51 +0000 |
commit | 87b56f36cc66554fdc2c435476a96a4f48789fea (patch) | |
tree | 53f09edf125262aa15a671ef2f04b7550895ba24 /manual/string.texi | |
parent | 51410f14533aadca209e3ac3775b16cac50613e5 (diff) | |
download | glibc-87b56f36cc66554fdc2c435476a96a4f48789fea.zip glibc-87b56f36cc66554fdc2c435476a96a4f48789fea.tar.gz glibc-87b56f36cc66554fdc2c435476a96a4f48789fea.tar.bz2 |
Update.
* sysdeps/unix/bsd/times.c: Reorder includes and add <time.h>.
(timeval_to_clock_t): Add clk_tck argument and use that instead of
CLK_TCK.
(__times): Use __getclktck to get the number of clock ticks per
second and use its return value instead of CLK_TCK.
2001-02-10 Mark Kettenis <kettenis@gnu.org>
Diffstat (limited to 'manual/string.texi')
-rw-r--r-- | manual/string.texi | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/manual/string.texi b/manual/string.texi index e3c15d1..745cb4a 100644 --- a/manual/string.texi +++ b/manual/string.texi @@ -1066,6 +1066,35 @@ located byte, or a null pointer if no match was found. @comment string.h @comment GNU +@deftypefun {void *} rawmemchr (const void *@var{block}, int @var{c}) +Often the @code{memchr} function is used with the knowledge that the +byte @var{c} is available in the memory block specified by the +parameters. But this means that the @var{size} parameter is not really +needed and that the tests performed with it at runtime (to check whether +the end of the block is reached) are not needed. + +The @code{rawmemchr} function exists for just this situation which is +surprisingly frequent. The interface is similar to @code{memchr} except +that the @var{size} parameter is missing. The function will look beyond +the end of the block pointed to by @var{block} in case the programmer +made in error in assuming that the byte @var{c} is present in the block. +In this case the result is unspecified. Otherwise the return value is a +pointer to the located byte. + +This function is of special interest when looking for the end of a +string. Since all strings are terminated by a null byte a call like + +@smallexample + rawmemchr (str, '\0') +@end smallexample + +will never go beyond the end of the string. + +This function is a GNU extension. +@end deftypefun + +@comment string.h +@comment GNU @deftypefun {void *} memrchr (const void *@var{block}, int @var{c}, size_t @var{size}) The function @code{memrchr} is like @code{memchr}, except that it searches backwards from the end of the block defined by @var{block} and @var{size} @@ -1094,7 +1123,7 @@ specifying a null character as the value of the @var{c} argument. @end deftypefun @comment string.h -@comment ??? +@comment GNU @deftypefun {char *} strchrnul (const char *@var{string}, int @var{c}) @code{strchrnul} is the same as @code{strchr} except that if it does not find the character, it returns a pointer to string's terminating |