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32c7acd464
Almost all uses of rawmemchr find the end of a string. Since most targets use a generic implementation, replacing it with strchr is better since that is optimized by compilers into strlen (s) + s. Also fix the generic rawmemchr implementation to use a cast to unsigned char in the if statement. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/* Copyright (C) 1991-2023 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <string.h>
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#include <libc-diag.h>
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#ifndef RAWMEMCHR
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# define RAWMEMCHR __rawmemchr
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#endif
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/* The pragmata should be nested inside RAWMEMCHR below, but that
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triggers GCC PR 98512. */
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DIAG_PUSH_NEEDS_COMMENT;
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#if __GNUC_PREREQ (7, 0)
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/* GCC 8 warns about the size passed to memchr being larger than
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PTRDIFF_MAX; the use of SIZE_MAX is deliberate here. */
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DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-overflow=");
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#endif
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#if __GNUC_PREREQ (11, 0)
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/* Likewise GCC 11, with a different warning option. */
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DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overread");
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#endif
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/* Find the first occurrence of C in S. */
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void *
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RAWMEMCHR (const void *s, int c)
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{
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if ((unsigned char) c != '\0')
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return memchr (s, c, (size_t)-1);
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return (char *)s + strlen (s);
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}
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libc_hidden_def (__rawmemchr)
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weak_alias (__rawmemchr, rawmemchr)
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DIAG_POP_NEEDS_COMMENT;
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