diff options
Diffstat (limited to 'private/crt32/string/ppc/strcmpp.s')
| -rw-r--r-- | private/crt32/string/ppc/strcmpp.s | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/private/crt32/string/ppc/strcmpp.s b/private/crt32/string/ppc/strcmpp.s new file mode 100644 index 000000000..0d57279e0 --- /dev/null +++ b/private/crt32/string/ppc/strcmpp.s @@ -0,0 +1,74 @@ +// TITLE("strcmp") +//++ +// +// Copyright (c) 1994 IBM Corporation +// +// Module Name: +// +// strcmp.s +// +// Routine Description: +// +// This function lexically determines two blocks of memory and +// returns an integer indicating order. +// STRCMP compares two strings and returns an integer +// to indicate whether the first is less than the second, the two are +// equal, or whether the first is greater than the second. +// +// Comparison is done byte by byte on an UNSIGNED basis, which is to +// say that Null (0) is less than any other character (1-255). +// +// Author: +// +// Jeff Simon (jhs) 03-Aug-1994 +// +// Environment: +// +// User or Kernel mode. +// +// Revision History: +// +// Includes + +#include <kxppc.h> + +// +// int strcmp ( +// const char * src, +// const char * dst +// ) +// +// Arguments: +// +// STR1 (r.3) - A pointer to the first string +// +// STR2 (r.4) - A pointer to the second string +// +// Return Value: +// +// < 0 if STR1 < STR2 +// = 0 if STR1 = STR2 for LNGTH bytes, or if LNGTH == 0 +// > 0 if STR1 > STR2 +// +// + LEAF_ENTRY(strcmp) + + lbz r5,0(r3) # init r5 + lbz r6,0(r4) # init r6 + or r9,r3,r3 # cp ptr +L..3: + cmpi 0x7,0x0,r6,0x0 # end of string ? + subf. r3,r6,r5 # lexical compare + bc 0xc,0x1e,L..4 # b, if null detected + bne L..4 # b, if not equal + lbzu r5,1(r9) # next char + lbzu r6,1(r4) # next char + b L..3 # loop + +L..4: + beqlr + addi r3,r0,-1 #?I hate doing this, but intel + bltlr #?ret -1, +1, so ... + addi r3,r0,1 #? + + LEAF_EXIT(strcmp) |