diff options
Diffstat (limited to 'private/crt32/string/ppc/strchrp.s')
| -rw-r--r-- | private/crt32/string/ppc/strchrp.s | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/private/crt32/string/ppc/strchrp.s b/private/crt32/string/ppc/strchrp.s new file mode 100644 index 000000000..0f03dc54a --- /dev/null +++ b/private/crt32/string/ppc/strchrp.s @@ -0,0 +1,70 @@ +// 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) |