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trigraphs

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This commit is contained in:
Wolfgang (Blub) Bumiller 2012-10-29 13:52:39 +01:00
parent 18272f9f34
commit e6cebc3ea3
1 changed files with 30 additions and 0 deletions
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30
lexer.c
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@ -197,6 +197,34 @@ void lex_close(lex_file *lex)
* are working on.
* The are merely wrapping get/put in order to count line numbers.
*/
static void lex_ungetch(lex_file *lex, int ch);
static int lex_try_trigraph(lex_file *lex, int old)
{
int c2, c3;
c2 = fgetc(lex->file);
if (c2 != '?') {
lex_ungetch(lex, c2);
return old;
}
c3 = fgetc(lex->file);
switch (c3) {
case '=': return '#';
case '/': return '\\';
case '\'': return '^';
case '(': return '[';
case ')': return ']';
case '!': return '|';
case '<': return '{';
case '>': return '}';
case '-': return '~';
default:
lex_ungetch(lex, c3);
lex_ungetch(lex, c2);
return old;
}
}
static int lex_getch(lex_file *lex)
{
int ch;
@ -211,6 +239,8 @@ static int lex_getch(lex_file *lex)
ch = fgetc(lex->file);
if (ch == '\n')
lex->line++;
else if (ch == '?')
return lex_try_trigraph(lex, ch);
return ch;
}