From 9975e3d37d8585b41db075321bade3495cf58cdb Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Wed, 12 Nov 2014 22:41:03 +0000 Subject: Fix locale memmem namespace (bug 17585). Locale code, brought in by ISO C functions, calls memmem, which is not an ISO C function. This isn't an ISO C conformance bug, because all mem* names are reserved, but glibc practice is not to rely on that reservation (thus, memmem is only declared in string.h if __USE_GNU even though ISO C would allow it to be declared unconditionally, for example). This patch changes that code to use __memmem. Note: there are uses of memmem elsewhere in glibc that I didn't change, although it may turn out some of those also need to use __memmem. Tested for x86_64 (testsuite, and that disassembly of installed shared libraries is unchanged by this patch). [BZ #17585] * string/memmem.c [!_LIBC] (__memmem): Define to memmem. (memmem): Rename to __memmem and define as weak alias of __memmem. Use libc_hidden_weak. (__memmem): Use libc_hidden_def. * include/string.h (__memmem): Declare. Use libc_hidden_proto. * locale/findlocale.c (valid_locale_name): Use __memmem instead of memmem. --- string/memmem.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'string/memmem.c') diff --git a/string/memmem.c b/string/memmem.c index b2842fe57f..bafac03df9 100644 --- a/string/memmem.c +++ b/string/memmem.c @@ -26,6 +26,7 @@ #ifndef _LIBC # define __builtin_expect(expr, val) (expr) +# define __memmem memmem #endif #define RETURN_TYPE void * @@ -38,8 +39,8 @@ if NEEDLE_LEN is 0, otherwise NULL if NEEDLE is not found in HAYSTACK. */ void * -memmem (const void *haystack_start, size_t haystack_len, - const void *needle_start, size_t needle_len) +__memmem (const void *haystack_start, size_t haystack_len, + const void *needle_start, size_t needle_len) { /* Abstract memory is considered to be an array of 'unsigned char' values, not an array of 'char' values. See ISO C 99 section 6.2.6.1. */ @@ -73,6 +74,8 @@ memmem (const void *haystack_start, size_t haystack_len, else return two_way_long_needle (haystack, haystack_len, needle, needle_len); } -libc_hidden_def (memmem) +libc_hidden_def (__memmem) +weak_alias (__memmem, memmem) +libc_hidden_weak (memmem) #undef LONG_NEEDLE_THRESHOLD -- cgit 1.4.1