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/*

FUNCTION

        <<memchr>>---find character in memory

INDEX

        memchr

ANSI_SYNOPSIS

        #include <string.h>

        void *memchr(const void *<[src]>, int <[c]>, size_t <[length]>);

TRAD_SYNOPSIS

        #include <string.h>

        void *memchr(<[src]>, <[c]>, <[length]>)

        void *<[src]>;

        void *<[c]>;

        size_t <[length]>;

DESCRIPTION

        This function searches memory starting at <<*<[src]>>> for the

        character <[c]>.  The search only ends with the first

        occurrence of <[c]>, or after <[length]> characters; in

        particular, <<NULL>> does not terminate the search.

RETURNS

        If the character <[c]> is found within <[length]> characters

        of <<*<[src]>>>, a pointer to the character is returned. If

        <[c]> is not found, then <<NULL>> is returned.

PORTABILITY

<<memchr>>  requires no supporting OS subroutines.

QUICKREF

        memchr ansi pure

*/

#include <ansidecl.h>

#ifdef __STDC__

#include <stddef.h>

#else

#define size_t unsigned long

#endif

PTR

memchr (src_void, c, length)

     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;

}