// Returns true iff the given atom (specified by escaped and pattern)
// matches ch. The result is undefined if the atom is invalid.
bool AtomMatchesChar(bool escaped, char pattern_char, char ch) {
if (escaped) { // "\\p" where p is pattern_char.
switch (pattern_char) {
case 'd': return IsAsciiDigit(ch);
case 'D': return !IsAsciiDigit(ch);
case 'f': return ch == '\f';
case 'n': return ch == '\n';
case 'r': return ch == '\r';
case 's': return IsAsciiWhiteSpace(ch);
case 'S': return !IsAsciiWhiteSpace(ch);
case 't': return ch == '\t';
case 'v': return ch == '\v';
case 'w': return IsAsciiWordChar(ch);
case 'W': return !IsAsciiWordChar(ch);
}
return IsAsciiPunct(pattern_char) && pattern_char == ch;
}
return (pattern_char == '.' && ch != '\n') || pattern_char == ch;
}
// Reads an integer.
bool SymFile::ReadInteger(unsigned long& n)
{
SkipWhitespace();
if (!IsAsciiDigit(m_buffer[m_pos]))
return false;
int startPos = m_pos;
int radix = 10;
if (m_buffer[m_pos] == '0' && m_buffer[m_pos + 1] == 'x')
{
radix = 16;
m_pos += 2;
}
unsigned long cutoff = ULONG_MAX / radix;
unsigned long cutoffRemainder = ULONG_MAX % radix;
int digit;
n = 0;
while ((digit = ConvertDigit(m_buffer[m_pos], radix)) != -1)
{
if (n < cutoff || (n == cutoff && (unsigned long)digit <= cutoffRemainder))
{
n = n * radix + digit;
}
else
{
m_pos++;
while (ConvertDigit(m_buffer[m_pos], radix) != -1)
m_pos++;
RaiseError("integer is too large (%s)", std::string(&m_buffer[startPos], m_pos - startPos).c_str());
}
m_pos++;
}
return true;
}
