Very fast number testing
Install with clib
$ clib install jb55/is_number.c
#include "is_number/is_number.h"
#include <assert.h>
int main() {
const char *str = "1.0";
int is_num;
is_num = is_number("1.0", 3);
assert(is_num);
is_num = is_number_with("1.", 2, ALLOW_EMPTY_POST_DOT);
assert(is_num);
is_num = is_number("1.", 2);
assert(!is_num);
}
enum is_num_options {
ALLOW_EMPTY_PRE_DOT = 1 << 1, // allow empty digits before the decimal point
ALLOW_EMPTY_POST_DOT = 1 << 2, // allow empty digits past the decimal point
STRICT_WHITESPACE = 1 << 3, // don't allow space padding
ONLY_TEST_INT = 1 << 4 // don't allow decimals/floats
};
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