Integer scanner function. (Useful for room tags.)

[DelPa]

int GetCustomValue(const char *_str, const char *_findSt, const char *_findEd = NULL);   // Function prototypes for header files.

// If an error occurs, this function will returns -1.
int GetCustomValue(const char *_str, const char *_findSt, const char *_findEd)  {
    const char *_findRes = strstr(_str, _findSt);   // Find the specified start string.

    if(_findRes == NULL)    {   // Error, not found.
        return -1;
    }

    int _findStLen = strlen(_findSt);   // Get length of the start string.
    const char *_findResSt = _findRes + _findStLen; // Go to integer position.

    if(_findResSt[0] == '\0')    {  // Error, last character is NULL.
        return -1;
    }

    if(_findResSt[0] == '0')    {   // Error, last character is zero.
        return -1;
    }

    char _strInteger[12];   // Will includes integer as string.
    int _nCount = 0;    // Read character count.
    bool _bSuccess = false; // Success or fail.

    for(int i = 0; i < (int)(sizeof(_strInteger) / sizeof(char)); i++)   { // Initialize buffer.
        _strInteger[i] = '\0';  // NULL character.
    }

    if(_findEd == NULL)    {    // End point is NULL.
        _bSuccess = true;
    }

    for(int i = 0; _findResSt[i] != '\0'; i++)   {  // Find integer.
        if(_findResSt[i] == '0' ||
           _findResSt[i] == '1' ||
           _findResSt[i] == '2' ||
           _findResSt[i] == '3' ||
           _findResSt[i] == '4' ||
           _findResSt[i] == '5' ||
           _findResSt[i] == '6' ||
           _findResSt[i] == '7' ||
           _findResSt[i] == '8' ||
           _findResSt[i] == '9')    {   // Check integer.
               _strInteger[i] = _findResSt[i];  // Copy integer from the source string.
               _nCount++;   // Copied integer count +1.
               if(_nCount > 9) {    // Error, max digit over.
                   _bSuccess = false;
                   break;
               }
        }   else {  // Check the end point.
            if(_findEd != NULL)    {    // Skip the check process if the end point is NULL.
                for(size_t j = 0; j < strlen(_findEd); j++)   { // Find the end point.
                    if(_findResSt[i + j] == '\0')    {  // Error, NULL character before search ends.
                        _bSuccess = false;
                        break;
                    }   else if(_findResSt[i + j] != _findEd[j])   {    // Error, end point string is mismatch.
                        _bSuccess = false;
                        break;
                    }   else {  // Every check is success.
                        _bSuccess = true;
                    }
                }
            }
            break;
        }
    }

    if(strlen(_strInteger) <= 0)    {   // Error, string is empty.
        _bSuccess = false;
    }

    if(_bSuccess == false)    { // Error.
        return -1;
    }

    return atoi(_strInteger);   // Done.
}

GetCustomValue function.

int GetCustomValue(
const char *_str,           // String to search for.
const char *_findSt,       // Starting string.
const char *_findEd        // Ending string.
);

Arguments description...
_str : String you want to search.
_findSt : String you want to start search.
_findEd : String you want to end search.

Return value...
If no error occurred, the function will returns found and converted to integer from string.
Otherwise, the function will returns -1.

Example code...
The following is an example of how to use this function.

int main()  {   // Start point of the program.
    // Some samples.
    char szBuffer[256];
    int nResult;

    // Sample 1.
    strcpy(szBuffer, "Sample [A=5] string.");
    cout << szBuffer << '\n';
    nResult = GetCustomValue(szBuffer, "[A=", "]");
    cout << " - Result : " << nResult << '\n';

    // Sample 2.
    strcpy(szBuffer, "Sample string. [B=120]");
    cout << szBuffer << '\n';
    nResult = GetCustomValue(szBuffer, "[B=", "]");
    cout << " - Result : " << nResult << '\n';

    // Sample 3.
    strcpy(szBuffer, "[C=5000] Sample string. [D=1234]");
    cout << szBuffer << '\n';
    nResult = GetCustomValue(szBuffer, "[C=", "]");
    cout << " - Result 1 : " << nResult << '\n';
    nResult = GetCustomValue(szBuffer, "[D=", "]");
    cout << " - Result 2 : " << nResult << '\n';

    // Sample 4.
    strcpy(szBuffer, "Sample @e5678 string.");
    cout << szBuffer << '\n';
    nResult = GetCustomValue(szBuffer, "@e", NULL);
    cout << " - Result : " << nResult << '\n';

    // Sample 5.
    strcpy(szBuffer, "$$99999$$ Sample string.");
    cout << szBuffer << '\n';
    nResult = GetCustomValue(szBuffer, "$$", "$$");
    cout << " - Result : " << nResult << '\n';

    // Error Sample 1.
    strcpy(szBuffer, "Error Sample string.");
    cout << szBuffer << '\n';
    nResult = GetCustomValue(szBuffer, "[F=", "]");
    cout << " - Result : " << nResult << '\n';

    // Error Sample 2.
    strcpy(szBuffer, "Error Sample string. [G=4321");
    cout << szBuffer << '\n';
    nResult = GetCustomValue(szBuffer, "[G=", "]");
    cout << " - Result : " << nResult << '\n';

    // Error Sample 3.
    strcpy(szBuffer, "Error @h0123 Sample string.");
    cout << szBuffer << '\n';
    nResult = GetCustomValue(szBuffer, "@h", NULL);
    cout << " - Result : " << nResult << '\n';

    // Error Sample 4.
    strcpy(szBuffer, "Error Sample [i=1000000000] string.");
    cout << szBuffer << '\n';
    nResult = GetCustomValue(szBuffer, "[i=", "]");
    cout << " - Result : " << nResult << '\n';

    // Error Sample 5.
    strcpy(szBuffer, "Error Sample [J=8765] string.");
    cout << szBuffer << '\n';
    nResult = GetCustomValue(szBuffer, "[j=", "]");
    cout << " - Result : " << nResult << '\n';

    // Error Sample 6.
    strcpy(szBuffer, "Error @k Sample string.");
    cout << szBuffer << '\n';
    nResult = GetCustomValue(szBuffer, "@k", NULL);
    cout << " - Result : " << nResult << '\n';


#ifdef _WIN32   // Pause the console if the running OS is windows.
    system("PAUSE");
#endif

    return 0;
}

p.s. Wrote at MSDN style.
If you find bad coding in this or there is good function than this, please post here.
Thanks.

(The original code is in attachment.)

[MentaL]

[Tankado]

ty, you are awesome