Thread: A question related to strcmp

Here is a program I wrote to construct a suffix array.

Code:

int pstrcmp(const void* str1, const void* str2){
	int tmp = strcmp((char*)str1, (char*)str2);
	return tmp;
}

int main(){

	char str[]="to be or not to be this is a problem.";
	char **a = (char**) malloc(sizeof(char*)*strlen(str));

	for(int i=0;i<strlen(str);i++){
		a[i] = &str[i];
	}

	qsort(a,strlen(str),sizeof(char*),pstrcmp);
	for(int i=0;i<strlen(str);i++) cout<<a[i]<<endl;

        return 0;
}

It seems pstrcmp doesn't work.... When I debug the pstrcmp, the tmp value is always -1! Anybody knows what's wrong?