diff options
Diffstat (limited to 'private/crt32/string/ppc/memchrp.s')
| -rw-r--r-- | private/crt32/string/ppc/memchrp.s | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/private/crt32/string/ppc/memchrp.s b/private/crt32/string/ppc/memchrp.s new file mode 100644 index 000000000..05a78105b --- /dev/null +++ b/private/crt32/string/ppc/memchrp.s @@ -0,0 +1,74 @@ +// TITLE("memchr") +//++ +// +// Copyright (c) 1994 IBM Corporation +// +// Module Name: +// +// memchr.s +// +// Routine Description: +// +// Searches buffer for character, stopping when found +// or after checking count bytes. +// +// Author: +// +// Jeff Simon (jhs) 02-Aug-1994 +// +// Environment: +// +// User or Kernel mode. +// +// Revision History: +// +// Includes + +#include <kxppc.h> + +// +// void * memchr ( +// const void * buffer, +// int character, +// size_t count +// ) +// +// Arguments: +// +// SRC1 (r.3) - A pointer to the block of memory +// +// SRC2 (r.4) - A character to base search +// +// LNGTH (r.5) - Max number of comparison in bytes +// +// Return Value: +// +// NULL if not found after count bytes +// ptr to character in buffer, if character is found +// +// + + LEAF_ENTRY(memchr) + + cmpi 0x7,0x0,r5,0 # chk cnt + cmpi 0x1,0x0,r5,1 # finish early + beq 0x7,Null # all done + + lbz r6,0(r3) # read char + cmp 0x6,0x0,r6,r4 # char ?= c + subi r5,r5,1 # decr cnt + beq 0x6,Fini # all done + beq 0x1,Null # rd 1 char only + + mtctr r5 # init ctr + +L..1: + lbzu r6,1(r3) + cmp 0x0,0x0,r6,r4 # char ?= c + bdnzf eq,L..1 # dec ctr & ... + beq Fini # br ctr != 0 & !char +Null: + addi r3,r0,0 # return null +Fini: + + LEAF_EXIT(memchr) |