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 } 34
