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172 lines
5.6 KiB
172 lines
5.6 KiB
page ,132
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title strnicmp - compare n chars of strings, ignore case
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;***
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;strnicmp.asm - compare n chars of strings, ignoring case
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;
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; Copyright (c) 1986-2001, Microsoft Corporation. All rights reserved.
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;
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;Purpose:
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; defines __ascii_strnicmp() - Compares at most n characters of two
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; strings, without regard to case.
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;
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;Revision History:
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; 04-04-85 RN initial version
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; 07-11-85 TC zeroed cx, to allow correct return value if not equal
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; 05-18-88 SJM Add model-independent (large model) ifdef
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; 08-04-88 SJM convert to cruntime/ add 32-bit support
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; 08-23-88 JCR 386 cleanup and improved return value sequence
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; 10-26-88 JCR General cleanup for 386-only code
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; 03-23-90 GJF Changed to _stdcall. Also, fixed the copyright.
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; 01-18-91 GJF ANSI naming.
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; 05-10-91 GJF Back to _cdecl, sigh...
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; 10-20-94 GJF Made locale sensitive (i.e., now works for all
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; single-byte character locales). Made multi-thread
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; safe. Also, deleted obsolete _STDCALL_ code.
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; 10-27-94 GJF Adapted above change for Win32S.
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; 11-12-94 GJF Must avoid volatile regs or save them across function
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; calls.
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; 11-22-94 GJF Forgot to increment pointers in non-C locales.
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; 07-03-95 CFW Changed offset of _lc_handle[LC_CTYPE], added sanity check
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; to crtlib.c to catch changes to win32s.h that modify offset.
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; 09-22-95 GJF Fixed first line at label differ2 to loaded -1 into
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; ecx (same as code a label differ).
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; 10-03-95 GJF New locale locking scheme.
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; 07-17-96 GJF Added lock prefix to increment and decrement of
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; __unguarded_readlc_active
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; 07-18-96 GJF Fixed race condition.
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; 09-10-98 GJF All locale and multithread support moved up to
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; strnicmp.c. Renamed this file to _strnicm.asm.
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; 06-12-01 PML inc->add 1, dec->sub 1 for Pentium 4 perf (vs7#267015)
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;
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;*******************************************************************************
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.xlist
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include cruntime.inc
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.list
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page
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;***
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;int __ascii_strnicmp(first, last, count) - compares count char of strings,
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; ignore case
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;
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;Purpose:
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; Compare the two strings for lexical order. Stops the comparison
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; when the following occurs: (1) strings differ, (2) the end of the
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; strings is reached, or (3) count characters have been compared.
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; For the purposes of the comparison, upper case characters are
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; converted to lower case.
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;
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; Algorithm:
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; int
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; _strncmpi (first, last, count)
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; char *first, *last;
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; unsigned int count;
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; {
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; int f,l;
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; int result = 0;
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;
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; if (count) {
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; do {
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; f = tolower(*first);
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; l = tolower(*last);
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; first++;
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; last++;
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; } while (--count && f && l && f == l);
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; result = f - l;
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; }
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; return(result);
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; }
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;
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;Entry:
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; char *first, *last - strings to compare
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; unsigned count - maximum number of characters to compare
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;
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;Exit:
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; returns <0 if first < last
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; returns 0 if first == last
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; returns >0 if first > last
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;
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;Uses:
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;
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;Exceptions:
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;
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;*******************************************************************************
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CODESEG
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public __ascii_strnicmp
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__ascii_strnicmp proc \
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uses edi esi ebx, \
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first:ptr byte, \
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last:ptr byte, \
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count:IWORD
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mov ecx,[count] ; cx = byte count
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or ecx,ecx
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jz toend ; if count = 0, we are done
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mov esi,[first] ; si = first string
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mov edi,[last] ; di = last string
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mov bh,'A'
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mov bl,'Z'
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mov dh,'a'-'A' ; add to cap to make lower
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align 4
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lupe:
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mov ah,[esi] ; *first
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or ah,ah ; see if *first is null
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mov al,[edi] ; *last
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jz short eject ; jump if *first is null
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or al,al ; see if *last is null
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jz short eject ; jump if so
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add esi,1 ; first++
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add edi,1 ; last++
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cmp ah,bh ; 'A'
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jb short skip1
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cmp ah,bl ; 'Z'
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ja short skip1
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add ah,dh ; make lower case
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skip1:
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cmp al,bh ; 'A'
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jb short skip2
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cmp al,bl ; 'Z'
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ja short skip2
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add al,dh ; make lower case
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skip2:
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cmp ah,al ; *first == *last ??
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jne short differ
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sub ecx,1
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jnz short lupe
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eject:
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xor ecx,ecx
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cmp ah,al ; compare the (possibly) differing bytes
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je short toend ; both zero; return 0
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differ:
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mov ecx,-1 ; assume last is bigger (* can't use 'or' *)
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jb short toend ; last is, in fact, bigger (return -1)
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neg ecx ; first is bigger (return 1)
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toend:
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mov eax,ecx
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ret ; _cdecl return
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__ascii_strnicmp endp
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end
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