[deliverable/binutils-gdb.git] / libiberty / memchr.c

/*

@deftypefn Supplemental void* memchr (const void *@var{s}, int @var{c}, @
  size_t @var{n})

This function searches memory starting at @code{*@var{s}} for the
character @var{c}.  The search only ends with the first occurrence of
@var{c}, or after @var{length} characters; in particular, a null
character does not terminate the search.  If the character @var{c} is
found within @var{length} characters of @code{*@var{s}}, a pointer
to the character is returned.  If @var{c} is not found, then @code{NULL} is
returned.

@end deftypefn

*/

#include <ansidecl.h>
#include <stddef.h>

PTR
memchr (register const PTR src_void, int c, size_t length)
{
  const unsigned char *src = (const unsigned char *)src_void;
  
  while (length-- > 0)
  {
    if (*src == c)
     return (PTR)src;
    src++;
  }
  return NULL;
}
Commit	Line	Data
	1	/*
	2
	3	@deftypefn Supplemental void* memchr (const void *@var{s}, int @var{c}, @
	4	size_t @var{n})
	5
	6	This function searches memory starting at @code{*@var{s}} for the
	7	character @var{c}. The search only ends with the first occurrence of
	8	@var{c}, or after @var{length} characters; in particular, a null
	9	character does not terminate the search. If the character @var{c} is
	10	found within @var{length} characters of @code{*@var{s}}, a pointer
	11	to the character is returned. If @var{c} is not found, then @code{NULL} is
	12	returned.
	13
	14	@end deftypefn
	15
	16	*/
	17
	18	#include <ansidecl.h>
	19	#include <stddef.h>
	20
	21	PTR
	22	memchr (register const PTR src_void, int c, size_t length)
	23	{
	24	const unsigned char src = (const unsigned char )src_void;
	25
	26	while (length-- > 0)
	27	{
	28	if (*src == c)
	29	return (PTR)src;
	30	src++;
	31	}
	32	return NULL;
	33	}