Character Literals

A literal of type char is expressed as a character or an escape sequence, enclosed in apostrophes:

Character Literal[30]:

CharacterLiteral: $'([^\\\n\015]|Escape[33]|Unicode Escape[3])' [mkchar]

This macro is invoked in definition 12.

Normalize a literal value[31]:

Token processor[1](`mkchar')
{ char strval[6], *p;
  int charval;

  if (c[1] != '\\') {
    strval[0] = c[1]; strval[1] = '\0';
    p = strval;
  } else if (c[2] == 'u') {
    p = strnorm(c + 3, 16, 10, "");
  } else if (c[2] >= '0' && c[2] <= '7') {
    p = strnorm(c + 2, 8, 10, "");
  } else {
    switch (c[2]) {
    case 'b': charval = '\b'; break;
    case 't': charval = '\t'; break;
    case 'n': charval = '\n'; break;
    case 'f': charval = '\f'; break;
    case 'r': charval = '\r'; break;
    case '"': charval = '"'; break;
    case '\'': charval = '\''; break;
    case '\\': charval = '\\'; break;
    default: {
      charval = c[2];
      message(ERROR, "Illegal escape", 0, &curpos);
      }
    }
    snprintf(strval, 6, "%d", charval);
    p = strval;
  }
    
  mkidn(p, strlen(p), t, s);
  *t = CharacterLiteral;
}

This macro is defined in definitions 18, 25, and 31.
This macro is invoked in definition 37.