findFirstSubStr.cpp

// Clairvoire@gmail.com  \(v ` >`)_v
// returns index of first `searchStrs` we found, or `searchCount` if none was found
// str				string we are searching through
// searchStrs		array of sub-strings we are looking for
// searchCount		the count of sub-strings we are looking for
// outStartOfArg	if not NULL, fills this with pointer to first char in found search, or NULL if none found
// outEndOfArg		if not NULL, fills this with pointer to first char AFTER found search, or NULL if none found
uint32 findFirstSubStr(const char * str, const char ** searchStrs, uint32 searchCount, const char ** outStartOfArg, const char ** outEndOfArg) {
    if (str && searchStrs && searchCount) {
        while (*str) {
            for (uint32 n = 0; n < searchCount; ++n) {
                if (searchStrs[n] && *str == searchStrs[n][0]) {
                    const char * token = searchStrs[n]+1;
                    const char * strSub = str+1;
                    while (*token && *token == *strSub) {
                        ++token;
                        ++strSub;
                    }
                    if (*token == 0) {
                        if(outStartOfArg) *outStartOfArg = str;
                        if(outEndOfArg) *outEndOfArg = strSub;
                        return n;
                    }
                }
            }
            ++str;
        }
    }
    if(outStartOfArg) *outStartOfArg = NULL;
    if(outEndOfArg) *outEndOfArg = NULL;
    return searchCount;
}

// same as `findFirstSubStr()` but case insensitive
uint32 findFirstSubStr_caseless(const char * str, const char ** searchStrs, uint32 searchCount, const char ** outStartOfArg, const char ** outEndOfArg) {
    if (str && searchStrs && searchCount) {
        while (*str) {
            for (uint32 n = 0; n < searchCount; ++n) {
                if (searchStrs[n] && tolower(*str) == tolower(searchStrs[n][0])) {
                    const char * token = searchStrs[n]+1;
                    const char * strSub = str+1;
                    while (*token && tolower(*token) == tolower(*strSub)) {
                        ++token;
                        ++strSub;
                    }
                    if (*token == 0) {
                        if(outStartOfArg) *outStartOfArg = str;
                        if(outEndOfArg) *outEndOfArg = strSub;
                        return n;
                    }
                }
            }
            ++str;
        }
    }
    if(outStartOfArg) *outStartOfArg = NULL;
    if(outEndOfArg) *outEndOfArg = NULL;
    return searchCount;
}