diff options
Diffstat (limited to 'private/crt32/string/ppc/memccpyp.s')
| -rw-r--r-- | private/crt32/string/ppc/memccpyp.s | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/private/crt32/string/ppc/memccpyp.s b/private/crt32/string/ppc/memccpyp.s new file mode 100644 index 000000000..3690a0bd5 --- /dev/null +++ b/private/crt32/string/ppc/memccpyp.s @@ -0,0 +1,78 @@ +// TITLE("memccpy") +//++ +// +// Copyright (c) 1994 IBM Corporation +// +// Module Name: +// +// memccpy.s +// +// Routine Description: +// +// Copies bytes from src to dest until count bytes have been +// copied, or up to and including the character c, whichever +// comes first. +// +// Author: +// +// Jeff Simon (jhs) 02-Aug-1994 +// +// Environment: +// +// User or Kernel mode. +// +// Revision History: +// +// Includes + +#include <kxppc.h> + +// +// Arguments: +// +// SRC1 (r.3) - A pointer to the memory destination +// +// SRC1 (r.4) - A pointer to the memory source +// +// CHAR (r.5) - A character to stop copy +// +// LNGTH (r.6) - Max number of comparison in bytes +// +// Return Value: +// +// NULL if search character is not found or not copied +// ptr to byte immediately after search character ... +// ... if character found AND copied +// +// void * _CALLTYPE1 _memccpyc ( +// void * dest, +// const void * src, +// int c, +// unsigned count +// ) +// + + LEAF_ENTRY(_memccpy) + + addi r7,r6,1 # incr count, artificial + mtctr r7 # move count to ctr + bdz L..7A # if 0, finish up + lbz r8,0(r4) # read 1st char + subi r3,r3,1 # prep r3 for update form + +L..3: + stbu r8,1(r3) # copy char + cmp 0x0,0x0,r8,r5 # compare to char c + beq L..5 # found char c, say goodbye + bdz L..7A # count 0, say goodbye + lbzu r8,1(r4) # read next char + b L..3 # do another + +L..5: + addi r3,r3,1 # ret r3+1 + b L..7 # all done, one exit pt. +L..7A: + addi r3,r0,0 # return null +L..7: + + LEAF_EXIT(_memccpy) |