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1998-01-28 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/memory.texi (Heap Consistency Checking): mcheck is declared in <mcheck.h>. Suggested by Jochen Voss <voss@mathematik.uni-kl.de> [PR libc/438] 1998-01-28 Andreas Jaeger <aj@arthur.rhein-neckar.de> * sysdeps/generic/memmem.c (memmem): An empty needle is at the beginning of haystack. 1998-01-29 Andreas Jaeger <aj@arthur.rhein-neckar.de> * nss/nss_files/files-service.c: Correct last patch. 1998-01-30 21:29 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c: Define __libc_have_rt_sigs. * sysdeps/sparc/sparc32/__longjmp.S: Define _SETJMP_H before including <bits/setjmp.h>. * sysdeps/sparc/sparc32/setjmp.S: Likewise. Patch from the Debian glibc/SPARC package. 1997-12-12 07:57 H.J. Lu <hjl@gnu.org> * sysdeps/alpha/bzero.S: Fix a typo. * sysdeps/alpha/htonl.S: Ditto. * sysdeps/alpha/htons.S: Ditto.
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* Copyright (C) 1991, 92, 93, 94, 96, 97, 98 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stddef.h>
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#include <string.h>
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#undef memmem
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/* Return the first occurrence of NEEDLE in HAYSTACK. */
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void *
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memmem (haystack, haystack_len, needle, needle_len)
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const void *haystack;
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size_t haystack_len;
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const void *needle;
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size_t needle_len;
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{
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const char *begin;
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const char *const last_possible
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= (const char *) haystack + haystack_len - needle_len;
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if (needle_len == 0)
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/* The first occurrence of the empty string is deemed to occur at
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the beginning of the string. */
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return (void *) &((const char *) haystack);
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for (begin = (const char *) haystack; begin <= last_possible; ++begin)
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if (begin[0] == ((const char *) needle)[0] &&
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!memcmp ((const void *) &begin[1],
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(const void *) ((const char *) needle + 1),
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needle_len - 1))
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return (void *) begin;
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return NULL;
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}
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