gzdoom/tools/re2c/examples/input_custom/fixed.re

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2016-02-07 02:58:35 +00:00
// Build with "--input custom" re2c switch.
//
// This is an example of handling fixed-length buffer with "--input custom":
// on each YYPEEK we check for the end of input, thus YYFILL generation
// can be safely suppressed.
//
// Note that YYLIMIT points not to terminating NULL, but to the previous
// character: we emulate the case when input has no terminating NULL.
//
// For a real-life example see https://github.com/sopyer/mjson
// or mjson.re from re2c test collection.
bool lex (const char * cursor, const char * const limit)
{
const char * marker;
const char * ctxmarker;
# define YYCTYPE char
# define YYPEEK() (cursor >= limit ? 0 : *cursor)
# define YYSKIP() ++cursor
# define YYBACKUP() marker = cursor
# define YYBACKUPCTX() ctxmarker = cursor
# define YYRESTORE() cursor = marker
# define YYRESTORECTX() cursor = ctxmarker
/*!re2c
re2c:yyfill:enable = 0;
"int buffer " / "[" [0-9]+ "]" { return true; }
* { return false; }
*/
}
int main ()
{
char buffer [] = "int buffer [1024]";
return !lex (buffer, buffer + sizeof (buffer) - 1);
}