9018336252
This adds an implementation of memrchr to libiberty and arranges to configure gcc to use it, if the host does not have it. PR cobol/119283 gcc/ChangeLog: * config.in: Regenerate. * configure: Regenerate. * configure.ac: Check for host memrchr. include/ChangeLog: * libiberty.h (memrchr): New. libiberty/ChangeLog: * Makefile.in: Add memrchr build rules. * config.in: Regenerate. * configure: Regenerate. * configure.ac: Check for memrchr. * functions.texi: Document memrchr. * memrchr.c: New file. Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
33 lines
883 B
C
33 lines
883 B
C
/*
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@deftypefn Supplemental void* memrchr (const void *@var{s}, int @var{c}, @
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size_t @var{n})
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This function searches memory for the character @var{c} in reverse order,
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starting at @code{*@var{s}+@var{n}-1} . The search only ends with
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the first occurrence of @var{c}, or when the start us reached; in particular,
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a null character does not terminate the search. If the character @var{c} is
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found within @var{length} characters of @code{*@var{s}}, a pointer
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to the character is returned. If @var{c} is not found, then @code{NULL} is
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returned.
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@end deftypefn
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*/
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#include <ansidecl.h>
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#include <stddef.h>
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void *
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memrchr (const void *src_void, int c, size_t length)
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{
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if (length == 0)
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return NULL;
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const unsigned char *p = (const unsigned char*)src_void;
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p += length;
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while (*--p != (unsigned char)c)
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if (src_void == p)
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return NULL;
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return (void *)p;
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}
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