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#include <libnu/defines.h>
#include <libnu/strings.h>
#if defined (NU_WITH_Z_STRINGS) || defined(NU_WITH_N_STRINGS)
static ssize_t _nu_strlen(const char *encoded, const char *limit, nu_read_iterator_t it) {
ssize_t len = 0;
const char *p = encoded;
while (p < limit) {
uint32_t u = 0;
p = it(p, &u);
if (u == 0) {
break;
}
++len;
}
return len;
}
static ssize_t _nu_bytelen(const uint32_t *unicode, const uint32_t *limit, nu_write_iterator_t it) {
ssize_t len = 0;
const uint32_t *p = unicode;
while (p < limit) {
if (*p == 0) {
break;
}
/* nu_write_iterator_t will return offset relative to 0
* which is effectively bytes length of codepoint */
size_t byte_len = (size_t)it(*p, 0);
len += byte_len;
++p;
}
return len;
}
static ssize_t _nu_strbytelen(const char *encoded, const char *limit, nu_read_iterator_t it) {
uint32_t u = 0;
const char *p = encoded;
while (p < limit) {
const char *np = it(p, &u);
if (u == 0) {
return (p - encoded);
}
p = np;
}
return 0;
}
#endif /* NU_WITH_N_STRINGS || NU_WITH_Z_STRINGS */
#ifdef NU_WITH_Z_STRINGS
ssize_t nu_strlen(const char *encoded, nu_read_iterator_t it) {
return _nu_strlen(encoded, NU_UNLIMITED, it);
}
ssize_t nu_bytelen(const uint32_t *unicode, nu_write_iterator_t it) {
return _nu_bytelen(unicode, NU_UNLIMITED, it);
}
ssize_t nu_strbytelen(const char *encoded, nu_read_iterator_t it) {
return _nu_strbytelen(encoded, NU_UNLIMITED, it);
}
#endif /* NU_WITH_Z_STRINGS */
#ifdef NU_WITH_N_STRINGS
ssize_t nu_strnlen(const char *encoded, size_t max_len, nu_read_iterator_t it) {
return _nu_strlen(encoded, encoded + max_len, it);
}
ssize_t nu_bytenlen(const uint32_t *unicode, size_t max_len, nu_write_iterator_t it) {
return _nu_bytelen(unicode, unicode + max_len, it);
}
#endif /* NU_WITH_N_STRINGS */
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