.586
.MODEL FLAT,STDCALL
OPTION CASEMAP:NONE

INCLUDE \masm32\include\windows.inc

INCLUDE \masm32\include\kernel32.inc
INCLUDELIB \masm32\lib\kernel32.lib

INCLUDE \masm32\include\ole32.inc
INCLUDELIB \masm32\lib\ole32.lib

INCLUDE \masm32\include\user32.inc
INCLUDELIB \masm32\lib\user32.lib

INCLUDE \masm32\include\msvcrt.inc
INCLUDELIB \masm32\lib\msvcrt.lib

INCLUDE \masm32\macros\MACROS.ASM

INCLUDE \masm32\include\masm32.inc
INCLUDELIB \masm32\lib\masm32.lib


isSubStr1 proto :dword, :dword
isSubStr2 proto :dword, :dword
isSubStri proto :dword, :dword

;ssssssssssssssssssssssss
;.const
;ssssssssssssssssssssssss

g_debug equ 0

;ssssssssssssssssssssssss
.DATA
;ssssssssssssssssssssssss

    g_szAppInfo db "文 件 名：isSubstr.asm", 0dh ,0ah
                db "功　　能：判断字符串1是否为字符串2的子串", 0dh ,0ah
                db "作　　者：PurpleEndurer, 2014-10-04，广西河池", 0dh ,0ah
                db "开发环境：Win xp Pro sp3 + MASM32 v11", 0dh ,0ah, 0
    g_sz1 db "bc", 0
    g_sz2 db "abcde", 0
    g_sz3 db "ac", 0
    g_sz4 db "cDe",0
    g_sz5 db "Bcd",0
    
    g_szFmt db "%s %s %d", 0dh, 0ah, 0
    g_buf20 db 20 dup(0)

;ssssssssssssssssssssssss
.CODE
;ssssssssssssssssssssssss
start:

    invoke StdOut, ADDR g_szAppInfo
    invoke isSubStr1, offset g_sz1, offset g_sz2
    invoke wsprintf, offset g_buf20, offset g_szFmt, offset g_sz1, offset g_sz2, eax
    invoke StdOut, offset g_buf20

    invoke isSubStr1, offset g_sz3, offset g_sz2
    invoke wsprintf, offset g_buf20, offset g_szFmt, offset g_sz3, offset g_sz2, eax
    invoke StdOut, offset g_buf20

    invoke isSubStr1, offset g_sz4, offset g_sz2
    invoke wsprintf, offset g_buf20, offset g_szFmt, offset g_sz4, offset g_sz2, eax
    invoke StdOut, offset g_buf20

    invoke isSubStr1, offset g_sz2, offset g_sz2
    invoke wsprintf, offset g_buf20, offset g_szFmt, offset g_sz2, offset g_sz2, eax
    invoke StdOut, offset g_buf20
    
    invoke isSubStr1, offset g_sz5, offset g_sz2
    invoke wsprintf, offset g_buf20, offset g_szFmt, offset g_sz5, offset g_sz2, eax
    invoke StdOut, offset g_buf20

    invoke ExitProcess, 0


;======================================================
isSubStr1 proc lpsz1:dword, lpsz2:dword
; 功能：判断字符串1是否为字符串2的子串（区分大小写）
; 入口：lpsz1:串1地址 lpsz2:串2地址
; 出口：eax=-1，不是子串
;            eax>=0，子串首次出现位置
;======================================================

    mov edi, lpsz2
    ;串2长度
    invoke lstrlen, edi
    mov ebx, eax

    mov esi, lpsz1
    ;串1长度
    invoke lstrlen, esi
   
    ;串2长度 < 串1长度?
    cmp ebx, eax ;eax=串1长度

    ;串2长度 < 串1长度，返回-1
    jl  @isSubStr1NoResult

    mov ecx, eax    ;串1长度
    cld
@isSubStr1LoopCmp:
    push ecx    ;串1长度
    push esi    ;串1首址
    push edi
    repe cmpsb
    jne  @F ;发现不匹配的，继续比较
    jecxz @isSubStr1YesResult    ;完全匹配
@@:
    pop  edi   ;恢复串2本次比较的首址
    inc  edi   ;使串2首址加1,指向下一个字符, 以便下次比较
    dec  ebx   ;串2长度减1
    pop  esi   ;恢复串1首址
    pop  ecx   ;恢复串1长度
    cmp  ebx, ecx
    jge  @isSubStr1LoopCmp ;串2长度>=串1长度, 继续比较

@isSubStr1NoResult:
    mov  eax, -1
    jmp  @isSubStr1Ret   
@isSubStr1YesResult:
    pop  eax   ;弹出先前压入的edi, 即本次比较时的串2的首址
    pop  esi   ;弹出esi, 无用
    pop  ecx   ;弹出串1长度
    sub  eax, lpsz2  ;计算串1在串2中的位置

@isSubStr1Ret:
    ret
isSubStr1 endp