return r;
}
+size_t utf16_encode_unichar(char16_t *out, char32_t c) {
+
+ /* Note that this encodes as little-endian. */
+
+ switch (c) {
+
+ case 0 ... 0xd7ffU:
+ case 0xe000U ... 0xffffU:
+ out[0] = htole16(c);
+ return 1;
+
+ case 0x10000U ... 0x10ffffU:
+ c -= 0x10000U;
+ out[0] = htole16((c >> 10) + 0xd800U);
+ out[1] = htole16((c & 0x3ffU) + 0xdc00U);
+ return 2;
+
+ default: /* A surrogate (invalid) */
+ return 0;
+ }
+}
+
+char16_t *utf8_to_utf16(const char *s, size_t length) {
+ char16_t *n, *p;
+ size_t i;
+ int r;
+
+ assert(s);
+
+ n = new(char16_t, length + 1);
+ if (!n)
+ return NULL;
+
+ p = n;
+
+ for (i = 0; i < length;) {
+ char32_t unichar;
+ size_t e;
+
+ e = utf8_encoded_expected_len(s + i);
+ if (e <= 1) /* Invalid and single byte characters are copied as they are */
+ goto copy;
+
+ if (i + e > length) /* sequence longer than input buffer, then copy as-is */
+ goto copy;
+
+ r = utf8_encoded_to_unichar(s + i, &unichar);
+ if (r < 0) /* sequence invalid, then copy as-is */
+ goto copy;
+
+ p += utf16_encode_unichar(p, unichar);
+ i += e;
+ continue;
+
+ copy:
+ *(p++) = htole16(s[i++]);
+ }
+
+ *p = 0;
+ return n;
+}
+
+size_t char16_strlen(const char16_t *s) {
+ size_t n = 0;
+
+ assert(s);
+
+ while (*s != 0)
+ n++, s++;
+
+ return n;
+}
+
/* expected size used to encode one unicode char */
static int utf8_unichar_to_encoded_len(char32_t unichar) {
char *utf8_escape_non_printable(const char *str);
size_t utf8_encode_unichar(char *out_utf8, char32_t g);
+size_t utf16_encode_unichar(char16_t *out, char32_t c);
+
char *utf16_to_utf8(const char16_t *s, size_t length /* bytes! */);
+char16_t *utf8_to_utf16(const char *s, size_t length);
+
+size_t char16_strlen(const char16_t *s);
int utf8_encoded_valid_unichar(const char *str);
int utf8_encoded_to_unichar(const char *str, char32_t *ret_unichar);
#include "alloc-util.h"
#include "string-util.h"
+#include "strv.h"
#include "utf8.h"
#include "util.h"
}
static void test_utf16_to_utf8(void) {
- char *a = NULL;
- const uint16_t utf16[] = { htole16('a'), htole16(0xd800), htole16('b'), htole16(0xdc00), htole16('c'), htole16(0xd801), htole16(0xdc37) };
- const char utf8[] = { 'a', 'b', 'c', 0xf0, 0x90, 0x90, 0xb7, 0 };
+ const char16_t utf16[] = { htole16('a'), htole16(0xd800), htole16('b'), htole16(0xdc00), htole16('c'), htole16(0xd801), htole16(0xdc37) };
+ static const char utf8[] = { 'a', 'b', 'c', 0xf0, 0x90, 0x90, 0xb7 };
+ _cleanup_free_ char16_t *b = NULL;
+ _cleanup_free_ char *a = NULL;
- a = utf16_to_utf8(utf16, 14);
+ /* Convert UTF-16 to UTF-8, filtering embedded bad chars */
+ a = utf16_to_utf8(utf16, sizeof(utf16));
assert_se(a);
- assert_se(streq(a, utf8));
+ assert_se(memcmp(a, utf8, sizeof(utf8)) == 0);
+
+ /* Convert UTF-8 to UTF-16, and back */
+ b = utf8_to_utf16(utf8, sizeof(utf8));
+ assert_se(b);
free(a);
+ a = utf16_to_utf8(b, char16_strlen(b) * 2);
+ assert_se(a);
+ assert_se(strlen(a) == sizeof(utf8));
+ assert_se(memcmp(a, utf8, sizeof(utf8)) == 0);
}
static void test_utf8_n_codepoints(void) {
assert_se(utf8_console_width("\xF1") == (size_t) -1);
}
+static void test_utf8_to_utf16(void) {
+ const char *p;
+
+ FOREACH_STRING(p,
+ "abc",
+ "zażółcić gęślą jaźń",
+ "串",
+ "",
+ "…👊🔪💐…") {
+
+ _cleanup_free_ char16_t *a = NULL;
+ _cleanup_free_ char *b = NULL;
+
+ a = utf8_to_utf16(p, strlen(p));
+ assert_se(a);
+
+ b = utf16_to_utf8(a, char16_strlen(a) * 2);
+ assert_se(b);
+ assert_se(streq(p, b));
+ }
+}
+
int main(int argc, char *argv[]) {
test_utf8_is_valid();
test_utf8_is_printable();
test_utf16_to_utf8();
test_utf8_n_codepoints();
test_utf8_console_width();
+ test_utf8_to_utf16();
return 0;
}