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// re2c $INPUT -o $OUTPUT
#include <assert.h>
// Expect a null-terminated string.
static int lex(const char *str, unsigned int len) {
const char *YYCURSOR = str, *YYLIMIT = str + len, *YYMARKER;
int count = 0;
for (;;) {
/*!re2c
re2c:define:YYCTYPE = char;
re2c:yyfill:enable = 0;
re2c:eof = 0;
str = ['] ([^'\\] | [\\][^])* ['];
* { return -1; }
$ { return count; }
str { ++count; continue; }
[ ]+ { continue; }
*/
}
}
#define TEST(s, r) assert(lex(s, sizeof(s) - 1) == r)
int main() {
TEST("", 0);
TEST("'qu\0tes' 'are' 'fine: \\'' ", 3);
TEST("'unterminated\\'", -1);
return 0;
}