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Filename :
04_generic_api_sentinel.re
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// re2c $INPUT -o $OUTPUT #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; int count = 0; loop: /*!re2c re2c:yyfill:enable = 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;"; * { return -1; } [\x00] { return count; } [a-z]+ { ++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("one two three ", 3); TEST("f0ur", -1); return 0; }