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// re2c $INPUT -o $OUTPUT
#include <assert.h>
#include <stdlib.h>
#include <string.h>
/*!max:re2c*/
static int lex(const char *str, unsigned int len) {
// Make a copy of the string with YYMAXFILL zeroes at the end.
char *buf = (char*) malloc(len + YYMAXFILL);
memcpy(buf, str, len);
memset(buf + len, 0, YYMAXFILL);
const char *YYCURSOR = buf, *YYLIMIT = buf + len + YYMAXFILL;
int count = 0;
loop:
/*!re2c
re2c:api:style = free-form;
re2c:define:YYCTYPE = char;
re2c:define:YYFILL = "goto fail;";
str = ['] ([^'\\] | [\\][^])* ['];
[\x00] {
// Check that it is the sentinel, not some unexpected null.
if (YYCURSOR - 1 == buf + len) goto exit; else goto fail;
}
str { ++count; goto loop; }
[ ]+ { goto loop; }
* { goto fail; }
*/
fail:
count = -1;
exit:
free(buf);
return count;
}
#define TEST(s, r) assert(lex(s, sizeof(s) - 1) == r)
int main() {
TEST("", 0);
TEST("'qu\0tes' 'are' 'fine: \\'' ", 3);
TEST("'unterminated\\'", -1);
TEST("'unexpected \0 null\\'", -1);
return 0;
}