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// re2c $INPUT -o $OUTPUT
#include <assert.h>
// Expect a null-terminated string.
static int lex(const char *YYCURSOR) {
int count = 0;
for (;;) {
/*!re2c
re2c:define:YYCTYPE = char;
re2c:yyfill:enable = 0;
* { return -1; }
[\x00] { return count; }
[a-z]+ { ++count; continue; }
[ ]+ { continue; }
*/
}
}
int main() {
assert(lex("") == 0);
assert(lex("one two three") == 3);
assert(lex("f0ur") == -1);
return 0;
}