求助C Programming 高手 這個問題

whiteShadow

Can you write in in C function ?

Find position of first occurrence of a case-insensitive string
int stripos ( char* haystack, char* needle, int offset )

Returns the numeric position of the first occurrence of needle in the haystack string. Note that the needle may be a string of one or more characters. If needle is not found, stripos() will return -1.

The function should not make use of any C library function calls.

whiteShadow

回复 1# whiteShadow

problem solved, 問題解決了. 關貼

abeach

int stripos ( char* haystack, char* needle, int offset )
{
    int position = -1;
    int positionCtr = -1;
    int matchedLenght = 0;
    int needleLength = 0;

    char * tmp = haystack;
    char * needleTmp = needle;

    tmp = (tmp + offset);

    while ( *needleTmp != '\0' && *needleTmp != '\n' ){
        needleLength++; needleTmp++;
    }
    needleTmp = needle;

    tmp = (tmp + offset);
    positionCtr = offset;

    while ( *tmp != '\0' && *tmp != '\n' ) {
        if ( *tmp == *needleTmp )
        {
            if ( matchedLenght++ == 0 ){
                position = positionCtr;
            }
            needleTmp++;
        } else if ( matchedLenght > 0 ){
            needleTmp = needle;
            position = -1;
            matchedLenght = 0;
        }
        positionCtr++;
        tmp++;
    }

    return position;
}

这样可以吗？