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Diffstat (limited to 'private/crt32/string/i386/strnicmp.asm')
| -rw-r--r-- | private/crt32/string/i386/strnicmp.asm | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/private/crt32/string/i386/strnicmp.asm b/private/crt32/string/i386/strnicmp.asm new file mode 100644 index 000000000..cec5ec5a6 --- /dev/null +++ b/private/crt32/string/i386/strnicmp.asm @@ -0,0 +1,153 @@ + page ,132 + title strnicmp - compare n chars of strings, ignore case +;*** +;strnicmp.asm - compare n chars of strings, ignoring case +; +; Copyright (c) 1985-1991, Microsoft Corporation. All rights reserved. +; +;Purpose: +; defines _strnicmp() - Compares at most n characters of two strings, +; without regard to case. +; +;Revision History: +; 04-04-85 RN initial version +; 07-11-85 TC zeroed cx, to allow correct return value if not equal +; 05-18-88 SJM Add model-independent (large model) ifdef +; 08-04-88 SJM convert to cruntime/ add 32-bit support +; 08-23-88 JCR 386 cleanup and improved return value sequence +; 10-26-88 JCR General cleanup for 386-only code +; 03-23-90 GJF Changed to _stdcall. Also, fixed the copyright. +; 01-18-91 GJF ANSI naming. +; 05-10-91 GJF Back to _cdecl, sigh... +; +;******************************************************************************* + + .xlist + include cruntime.inc + .list + + +page +;*** +;int _strnicmp(first, last, count) - compares count char of strings, ignore case +; +;Purpose: +; Compare the two strings for lexical order. Stops the comparison +; when the following occurs: (1) strings differ, (2) the end of the +; strings is reached, or (3) count characters have been compared. +; For the purposes of the comparison, upper case characters are +; converted to lower case. +; +; Algorithm: +; int +; _strncmpi (first, last, count) +; char *first, *last; +; unsigned int count; +; { +; int f,l; +; int result = 0; +; +; if (count) { +; do { +; f = tolower(*first); +; l = tolower(*last); +; first++; +; last++; +; } while (--count && f && l && f == l); +; result = f - l; +; } +; return(result); +; } +; +;Entry: +; char *first, *last - strings to compare +; unsigned count - maximum number of characters to compare +; +;Exit: +; returns <0 if first < last +; returns 0 if first == last +; returns >0 if first > last +; +;Uses: +; +;Exceptions: +; +;******************************************************************************* + + CODESEG + + public _strnicmp +_strnicmp proc \ + uses edi esi ebx, \ + first:ptr byte, \ + last:ptr byte, \ + count:IWORD + + + mov esi,[first] ; si = first string + mov edi,[last] ; di = last string + + mov ecx,[count] ; cx = byte count + jecxz short toend ; if count=0 + + mov bh,'A' + mov bl,'Z' + mov dh,'a'-'A' ; add to cap to make lower + +lupe: + mov ah,[esi] ; *first + mov al,[edi] ; *last + + or ah,ah ; see if *first is null + jz short eject ; jump if so + + or al,al ; see if *last is null + jz short eject ; jump if so + + inc esi ; first++ + inc edi ; last++ + + cmp ah,bh ; 'A' + jb short skip1 + + cmp ah,bl ; 'Z' + ja short skip1 + + add ah,dh ; make lower case + +skip1: + cmp al,bh ; 'A' + jb short skip2 + + cmp al,bl ; 'Z' + ja short skip2 + + add al,dh ; make lower case + +skip2: + cmp ah,al ; *first == *last ?? + jne short differ + + loop lupe + +eject: + xor ecx,ecx + cmp ah,al ; compare the (possibly) differing bytes + je short toend ; both zero; return 0 + +differ: + mov ecx,-1 ; assume last is bigger (* can't use 'or' *) + jb short toend ; last is, in fact, bigger (return -1) + neg ecx ; first is bigger (return 1) + +toend: + mov eax,ecx + +ifdef _STDCALL_ + ret 2*DPSIZE + ISIZE ; _stdcall return +else + ret ; _cdecl return +endif + +_strnicmp endp + end |