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// re2c $INPUT -o $OUTPUT
#include <assert.h>
#include <stdlib.h>
#include <string.h>
static int lex(const char *str, unsigned int len) {
// For the sake of example create a string without terminating null.
char *buf = (char*) malloc(len);
memcpy(buf, str, len);
const char *cur = buf, *lim = buf + len;
int count = 0;
for (;;) {
/*!re2c
re2c:yyfill:enable = 0;
re2c:api = custom;
re2c:api:style = free-form;
re2c:define:YYCTYPE = char;
re2c:define:YYPEEK = "cur < lim ? *cur : 0"; // fake null
re2c:define:YYSKIP = "++cur;";
* { count = -1; break; }
[\x00] { break;; }
[a-z]+ { ++count; continue;; }
[ ]+ { continue; }
*/
}
free(buf);
return count;
}
#define TEST(s, r) assert(lex(s, sizeof(s) - 1) == r)
int main() {
TEST("", 0);
TEST("one two three ", 3);
TEST("f0ur", -1);
return 0;
}