// TITLE("strchr")
//++
//
// Copyright (c) 1994 IBM Corporation
//
// Module Name:
//
// strchr.s
//
// Routine Description:
//
// Searches a string for a given character, which may be the
// null character '\0'.
//
// Author:
//
// Jeff Simon (jhs) 02-Aug-1994
//
// Environment:
//
// User or Kernel mode.
//
// Revision History:
//
// Includes
#include <kxppc.h>
//
// *char *strchr(
// char *str,
// char c)
// Arguments:
//
// SRC1 (r.3) - A pointer to the first block of memory
//
// SRC2 (r.4) - A search character
//
//
// Return Value:
//
// returns pointer to the first occurence of c in string
// returns NULL if c does not occur in string
//
//
LEAF_ENTRY(strchr)
lbz r6,0(r3) # read char
cmpi 0x0,0x0,r4,0 # c ?= null
beq L..3A # use special loop
L..3:
cmpi 0x1,0x0,r6,0 # char ?= null
cmp 0x0,0x0,r6,r4 # char ?= c
beq 0x1,L..5A # b, if char is null
beq Fini
lbzu r6,1(r3) # read char
b L..3
L..3A:
cmpi 0x0,0x0,r6,0 # char ?= null
beq Fini
lbzu r6,1(r3) # read char
b L..3A
L..5A:
addi r3,r0,0 # return null
Fini:
LEAF_EXIT(strchr)
