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// re2c $INPUT -o $OUTPUT --loop-switch -i
#include <assert.h>
#include <stdlib.h>
#include <string.h>
// expect a string without terminating null
static int lex(const char *str, unsigned int len)
{
const char *cur = str, *lim = str + len, *mar;
int count = 0;
loop:
/*!re2c
re2c:yyfill:enable = 0;
re2c:eof = 0;
re2c:flags:input = custom;
re2c:api:style = free-form;
re2c:define:YYCTYPE = char;
re2c:define:YYLESSTHAN = "cur >= lim";
re2c:define:YYPEEK = "cur < lim ? *cur : 0"; // fake null
re2c:define:YYSKIP = "++cur;";
re2c:define:YYBACKUP = "mar = cur;";
re2c:define:YYRESTORE = "cur = mar;";
* { return -1; }
$ { return count; }
['] ([^'\\] | [\\][^])* ['] { ++count; goto loop; }
[ ]+ { goto loop; }
*/
}
// make a copy of the string without terminating null
static void test(const char *str, unsigned int len, int res)
{
char *s = (char*) malloc(len);
memcpy(s, str, len);
int r = lex(s, len);
free(s);
assert(r == res);
}
#define TEST(s, r) test(s, sizeof(s) - 1, r)
int main()
{
TEST("", 0);
TEST("'qu\0tes' 'are' 'fine: \\'' ", 3);
TEST("'unterminated\\'", -1);
return 0;
}
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