diff options
Diffstat (limited to 'private/crt32/string/ppc/strrchrp.s')
| -rw-r--r-- | private/crt32/string/ppc/strrchrp.s | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/private/crt32/string/ppc/strrchrp.s b/private/crt32/string/ppc/strrchrp.s new file mode 100644 index 000000000..e3b5991c5 --- /dev/null +++ b/private/crt32/string/ppc/strrchrp.s @@ -0,0 +1,87 @@ +// TITLE("strrchr") +//++ +// +// Copyright (c) 1994 IBM Corporation +// +// Module Name: +// +// strrchr.s +// +// Routine Description: +// +// This function searches a null-terminated string for the +// last occurence of a character. +// +// Author: +// +// Jeff Simon (jhs) 02-Aug-1994 +// +// Environment: +// +// User or Kernel mode. +// +// Revision History: +// +// Includes + +#include <kxppc.h> +// +// char * strrchr +// ( +// const char * string, +// int ch +// ) +// +// +// Arguments: +// +// STR1 (r.3) - A pointer to the first block of memory +// +// CHAR (r.4) - A search character +// +// Return Value: +// +// NULL if character is never found +// ptr to the character in string where last match is found +// +// + + LEAF_ENTRY(strrchr) + + + lbz r5,0(r3) # read 1st char + or r9,r3,r3 # cp char ptr + cmpi 0x6,0x0,r4,0x0 # ch ?= Null + cmp 0x0,0x0,r5,r4 # r5 ?= ch + bc 0xc,0x1a,L..2 + addi r3,r0,0 # init to Null + beq L..1A # b if 1st ch matched + +L..1: # CASE: ch != Null + + cmpi 0x6,0x0,r5,0x0 # end of str ? + bc 0xc,0x1a,Fini # all done + lbzu r5,1(r9) # read nxt char + cmp 0x0,0x0,r4,r5 # r4 ?= r5 + bne L..1 + +L..1A: # CASE: match found + + or r3,r9,r9 # Update char ptr + lbzu r5,1(r9) # load next char + cmp 0x0,0x0,r4,r5 # r4 ?= r5 + beq L..1A + b L..1 + + +L..2: # CASE: char = Null + + bc 0xc,0x2,Fini # ret if null found + lbzu r5,1(r3) + cmpi 0x0,0x0,r5,0x0 # Is r5 ?= Null + b L..2 + + +Fini: + + LEAF_EXIT(strrchr) |