Search buffer for a character.
  Searches the first num bytes of memory block pointed by buffer for character c.

Parameters.

buffer

Pointer to buffer.

c

Key character to look for.

num

Number of characters to check from buffer.

Return Value.
  A pointer to the first occurrence of c in buffer.
If character is not found the function returns NULL.

Portability.
  Defined in ANSI-C.
  ANSI-C++ standard specifies two different declarations for this function instead of the one included in ANSI-C:

const void * memchr ( const void * buffer, int c, size_t num );
      void * memchr (       void * buffer, int c, size_t num );

Example.

/* memchr example */
#include <stdio.h>
#include <string.h>

main ()
{
  char * pch;
  char str[] = "Example string";
  pch = (char*) memchr (str, 'l', strlen(str));
  if (pch!=NULL)
    printf ("Character l was at position %d.\n", pch-str+1);
  else
    printf ("Character l was not found");
  return 0;
}

See also.
  memcmp, memcpy, memset, strchr