Discussione: InStr

Codice:

// Explaination of parameters: 
// 1)int dwStart - the integer number the search of the string has to start from
// 2)char *lpszSearchString - the complete string where to find the lpszFindString
// 3)char *lpszFindString - the string to search in lpszSearchString starting by "dwStart" characters
int InStr(int dwStart, LPSTR lpszSearchString, LPSTR lpszFindString)
{
    int     retVal = 0;
    int     len = strlen(lpszSearchString);
    int     lensub = strlen(lpszFindString);
    LPSTR   substr = (LPSTR)malloc(lensub + 1);
    int     q;
    int     t;
    if(!len)
    {
        goto L0;
    }
    if(!lensub)
    {
        goto L0;
    }
    if(len < lensub)
    {
        goto L0;
    }
    if(dwStart < 1)
    {
        dwStart = 1;
    }
    if(len == lensub && dwStart == 1)
    {
        if(!strcmp(lpszSearchString, lpszFindString))
        {
            retVal = 1;
        }
        goto L0;
    }
    for(q = dwStart - 1; q <= len; q++)
    {
        if(lpszSearchString[q] == lpszFindString[0])
        {
            for(t = 0; t < lensub; t++)
            {
                substr[t] = lpszSearchString[q + t];
            }
            substr[t] = 0;
            if(!strcmp(substr, lpszFindString))
            {
                retVal = q + 1;
                break;
            }
        }
    }
L0:
    free(substr);
    return retVal;
}