Question

c指针问题求大神

程序目的是查找字符串1中是否有子字符串2，若有，则删除第一个子字符串2
先上代码:
#include <stdio.h>

int del_substr(char *str , char const *substr);

int main()
{
char *str1 = "asdfghjkl";
char *str2 = "dfg";

del_substr(str1 , str2);

printf("%s\n" , str1);

return 0;
}

int del_substr(char *str , char const *substr)
{
char *currChar = str;
char *currSubChar = (char *)substr;
int subLen = 0;

if (*substr == 0) //空串
return 1;

while(*currChar)
{
/*匹配目标字符串中是否有子字符串*/
if ( *currChar == *currSubChar)
for (subLen = 0 ; *(currSubChar +subLen ); subLen ++)
if ( *(currChar + subLen) != *(currSubChar + subLen ) )
break;

/*成功匹配到字符串，进行移动处理*/
if ( !*(currSubChar + subLen) )
{
for ( ; *currChar ; currChar ++)
*currChar = *(currChar + subLen );

* ++currChar = 0; //给字符串结尾

return 1;
}

currChar ++;
}

return 0;
}

错误提示：

错误代码:
*currChar = *(currChar + subLen );

反汇编代码:
*currChar = *(currChar + subLen );
00DB148E mov eax,dword ptr [currChar]
00DB1491 add eax,dword ptr [subLen]
00DB1494 mov ecx,dword ptr [currChar]
00DB1497 mov dl,byte ptr [eax]
00DB1499 mov byte ptr [ecx],dl
00DB149B jmp del_substr+0ABh (0DB147Bh)

求大神看看这是怎么回事？

Answer 1

#include <stdio.h>

int del_substr(char *str , char const *substr);


int main()
{
char str1[] = "asdfghjkl";//<----------------------------------
char *str2 = "dfg";

del_substr(str1 , str2);

printf("%s\n" , str1);

return 0;
}


int del_substr(char *str , char const *substr)
{
char *currChar = str;
char *currSubChar = (char *)substr;
int subLen = 0;

if (*substr == 0)	//空串
return 1;

while(*currChar)
{
/*匹配目标字符串中是否有子字符串*/
if ( *currChar == *currSubChar)
for (subLen = 0 ; *(currSubChar +subLen ); subLen ++)
if ( *(currChar + subLen) != *(currSubChar + subLen ) )
break;

/*成功匹配到字符串，进行移动处理*/
if ( !*(currSubChar + subLen) )
{
for ( ; *currChar ; currChar ++)
*currChar = *(currChar + subLen );

* ++currChar = 0;	//给字符串结尾

return 1;
}

currChar ++;
}

return 0;
}