Function ParseSigned

base/string/format/scan_arg.cpp:92–138

template <typename Type>
static int ParseSigned(const char* str, const ScanSpecification& spec, Type* value)
{
    int base = 0;
    switch (spec.specifier) {
    case 'v':
    case 'i':
        break;
    case 'd':
        base = 10;
        break;
    case 'x':
    case 'X':
        base = 16;
        break;
    case 'o':
        base = 8;
        break;
    default:
        LOG(DFATAL) << "Invalid scan specifier '" << spec.specifier
                    << "' for signed integral type";
        return 0;
    }

    char* endptr;
    int saved_errno = errno;
    Type v;
    errno = 0;
    if (sizeof(Type) > sizeof(long)) {
        long long n = strtoll(str, &endptr, base);
        if (errno != 0)
            return 0;
        v = n;
    } else {
        long n = strtol(str, &endptr, base);
        if (errno != 0)
            return 0;
        v = n;
        if (v != n) {
            errno = ERANGE;
            return false;
        }
    }

    *value = v;
    errno = saved_errno;
    return endptr - str;
}

template <typename Type>
static int ParseUnsigned(const char* str, const ScanSpecification& spec, Type* value)