STRING_HANDLE STRING_construct_sprintf()

in src/strings.c [134:207]

• 65 lines of code
• 7 McCabe index (conditional complexity)

STRING_HANDLE STRING_construct_sprintf(const char* format, ...)
{
    STRING* result;

#ifdef STRINGS_C_SPRINTF_BUFFER_SIZE
    size_t maxBufSize = STRINGS_C_SPRINTF_BUFFER_SIZE;
    char buf[STRINGS_C_SPRINTF_BUFFER_SIZE];
#else
    size_t maxBufSize = 0;
    char* buf = NULL;
#endif

    if (format != NULL)
    {
        va_list arg_list;
        int length;
        va_start(arg_list, format);

        va_list arg_list_clone;
        va_copy(arg_list_clone, arg_list);

        /* Codes_SRS_STRING_07_041: [STRING_construct_sprintf shall determine the size of the resulting string and allocate the necessary memory.] */
        length = vsnprintf(buf, maxBufSize, format, arg_list);
        va_end(arg_list);
        if (length > 0)
        {
            result = malloc(sizeof(STRING));
            if (result != NULL)
            {
                result->s = malloc(length + (size_t)1);
                if (result->s != NULL)
                {
                    if (vsnprintf(result->s, length + 1, format, arg_list_clone) < 0)
                    {
                        /* Codes_SRS_STRING_07_040: [If any error is encountered STRING_construct_sprintf shall return NULL.] */
                        free(result->s);
                        free(result);
                        result = NULL;
                        LogError("Failure: vsnprintf formatting failed.");
                    }
                }
                else
                {
                    /* Codes_SRS_STRING_07_040: [If any error is encountered STRING_construct_sprintf shall return NULL.] */
                    free(result);
                    result = NULL;
                    LogError("Failure: allocation sprintf value failed.");
                }
            }
            else
            {
                LogError("Failure: allocation failed.");
            }
        }
        else if (length == 0)
        {
            result = STRING_new();
        }
        else
        {
            /* Codes_SRS_STRING_07_039: [If the parameter format is NULL then STRING_construct_sprintf shall return NULL.] */
            result = NULL;
            LogError("Failure: vsnprintf return negative length");
        }
        va_end(arg_list_clone);
    }
    else
    {
        LogError("Failure: invalid argument.");
        result = NULL;
    }
    /* Codes_SRS_STRING_07_045: [STRING_construct_sprintf shall allocate a new string with the value of the specified printf formated const char. ] */
    return (STRING_HANDLE)result;
}