utf8.[ch]: use char32_t and char16_t instead of int, int32_t, int16_t

rework C11 utf8.[ch] to use char32_t instead of uint32_t when referring
to unicode chars, to make things more expressive.

6 files changed, 37 insertions, 33 deletions

diff --git a/src/basic/escape.c b/src/basic/escape.c
index add0d7795b..5cb8287b61 100644
--- a/src/basic/escape.c
+++ b/src/basic/escape.c
@@ -226,7 +226,7 @@ int cunescape_one(const char *p, size_t length, char *ret, uint32_t *ret_unicode
 
                 int a[8];
                 unsigned i;
-                uint32_t c;
+                char32_t c;
 
                 if (length != (size_t) -1 && length < 9)
                         return -EINVAL;
@@ -237,8 +237,8 @@ int cunescape_one(const char *p, size_t length, char *ret, uint32_t *ret_unicode
                                 return a[i];
                 }
 
-                c = ((uint32_t) a[0] << 28U) | ((uint32_t) a[1] << 24U) | ((uint32_t) a[2] << 20U) | ((uint32_t) a[3] << 16U) |
-                    ((uint32_t) a[4] << 12U) | ((uint32_t) a[5] <<  8U) | ((uint32_t) a[6] <<  4U) |  (uint32_t) a[7];
+                c = (a[0] << 28U) | (a[1] << 24U) | (a[2] << 20U) | (a[3] << 16U) |
+                    (a[4] << 12U) | (a[5] <<  8U) | (a[6] <<  4U) | (a[7] <<  0U);
 
                 /* Don't allow 0 chars */
                 if (c == 0)
@@ -272,7 +272,7 @@ int cunescape_one(const char *p, size_t length, char *ret, uint32_t *ret_unicode
         case '7': {
                 /* octal encoding */
                 int a, b, c;
-                uint32_t m;
+                char32_t m;
 
                 if (length != (size_t) -1 && length < 3)
                         return -EINVAL;
@@ -294,7 +294,7 @@ int cunescape_one(const char *p, size_t length, char *ret, uint32_t *ret_unicode
                         return -EINVAL;
 
                 /* Don't allow bytes above 255 */
-                m = ((uint32_t) a << 6U) | ((uint32_t) b << 3U) | (uint32_t) c;
+                m = (a << 6U) | (b << 3U) | (char32_t) c;
                 if (m > 255)
                         return -EINVAL;
 
@@ -331,7 +331,7 @@ int cunescape_length_with_prefix(const char *s, size_t length, const char *prefi
 
         for (f = s, t = r + pl; f < s + length; f++) {
                 size_t remaining;
-                uint32_t u;
+                char32_t u;
                 char c;
                 int k;
 
diff --git a/src/basic/extract-word.c b/src/basic/extract-word.c
index c0f9394fad..63dedf612c 100644
--- a/src/basic/extract-word.c
+++ b/src/basic/extract-word.c
@@ -99,7 +99,7 @@ int extract_first_word(const char **p, char **ret, const char *separators, Extra
                         }
 
                         if (flags & EXTRACT_CUNESCAPE) {
-                                uint32_t u;
+                                char32_t u;
 
                                 r = cunescape_one(*p, (size_t) -1, &c, &u);
                                 if (r < 0) {
diff --git a/src/basic/json.c b/src/basic/json.c
index 716705e5ff..a22bc865a7 100644
--- a/src/basic/json.c
+++ b/src/basic/json.c
@@ -319,7 +319,7 @@ static int json_parse_string(const char **p, char **ret) {
                         else if (*c == 't')
                                 ch = '\t';
                         else if (*c == 'u') {
-                                uint16_t x;
+                                char16_t x;
                                 int r;
 
                                 r = unhex_ucs2(c + 1, &x);
@@ -332,7 +332,7 @@ static int json_parse_string(const char **p, char **ret) {
                                         return -ENOMEM;
 
                                 if (!utf16_is_surrogate(x))
-                                        n += utf8_encode_unichar(s + n, x);
+                                        n += utf8_encode_unichar(s + n, (char32_t) x);
                                 else if (utf16_is_trailing_surrogate(x))
                                         return -EINVAL;
                                 else {
diff --git a/src/basic/string-util.c b/src/basic/string-util.c
index 63b9b79df9..4583a3ce2e 100644
--- a/src/basic/string-util.c
+++ b/src/basic/string-util.c
@@ -413,7 +413,7 @@ char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigne
 
         k = 0;
         for (i = s; k < x && i < s + old_length; i = utf8_next_char(i)) {
-                int c;
+                char32_t c;
 
                 c = utf8_encoded_to_unichar(i);
                 if (c < 0)
@@ -425,7 +425,7 @@ char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigne
                 x ++;
 
         for (j = s + old_length; k < new_length && j > i; ) {
-                int c;
+                char32_t c;
 
                 j = utf8_prev_char(j);
                 c = utf8_encoded_to_unichar(j);
diff --git a/src/basic/utf8.c b/src/basic/utf8.c
index 7600d99903..cc041d5b34 100644
--- a/src/basic/utf8.c
+++ b/src/basic/utf8.c
@@ -54,7 +54,7 @@
 #include "utf8.h"
 #include "util.h"
 
-bool unichar_is_valid(uint32_t ch) {
+bool unichar_is_valid(char32_t ch) {
 
         if (ch >= 0x110000) /* End of unicode space */
                 return false;
@@ -68,7 +68,7 @@ bool unichar_is_valid(uint32_t ch) {
         return true;
 }
 
-static bool unichar_is_control(uint32_t ch) {
+static bool unichar_is_control(char32_t ch) {
 
         /*
           0 to ' '-1 is the C0 range.
@@ -104,8 +104,9 @@ static int utf8_encoded_expected_len(const char *str) {
 }
 
 /* decode one unicode char */
-int utf8_encoded_to_unichar(const char *str) {
-        int unichar, len, i;
+char32_t utf8_encoded_to_unichar(const char *str) {
+       char32_t unichar;
+       int len, i;
 
         assert(str);
 
@@ -113,31 +114,31 @@ int utf8_encoded_to_unichar(const char *str) {
 
         switch (len) {
         case 1:
-                return (int)str[0];
+                return (char32_t)str[0];
         case 2:
                 unichar = str[0] & 0x1f;
                 break;
         case 3:
-                unichar = (int)str[0] & 0x0f;
+                unichar = (char32_t)str[0] & 0x0f;
                 break;
         case 4:
-                unichar = (int)str[0] & 0x07;
+                unichar = (char32_t)str[0] & 0x07;
                 break;
         case 5:
-                unichar = (int)str[0] & 0x03;
+                unichar = (char32_t)str[0] & 0x03;
                 break;
         case 6:
-                unichar = (int)str[0] & 0x01;
+                unichar = (char32_t)str[0] & 0x01;
                 break;
         default:
                 return -EINVAL;
         }
 
         for (i = 1; i < len; i++) {
-                if (((int)str[i] & 0xc0) != 0x80)
+                if (((char32_t)str[i] & 0xc0) != 0x80)
                         return -EINVAL;
                 unichar <<= 6;
-                unichar |= (int)str[i] & 0x3f;
+                unichar |= (char32_t)str[i] & 0x3f;
         }
 
         return unichar;
@@ -149,7 +150,8 @@ bool utf8_is_printable_newline(const char* str, size_t length, bool newline) {
         assert(str);
 
         for (p = str; length;) {
-                int encoded_len, val;
+                int encoded_len;
+                char32_t val;
 
                 encoded_len = utf8_encoded_valid_unichar(p);
                 if (encoded_len < 0 ||
@@ -277,7 +279,7 @@ char *ascii_is_valid(const char *str) {
  * Returns: The length in bytes that the UTF-8 representation does or would
  *          occupy.
  */
-size_t utf8_encode_unichar(char *out_utf8, uint32_t g) {
+size_t utf8_encode_unichar(char *out_utf8, char32_t g) {
 
         if (g < (1 << 7)) {
                 if (out_utf8)
@@ -321,7 +323,7 @@ char *utf16_to_utf8(const void *s, size_t length) {
         t = r;
 
         while (f < (const uint8_t*) s + length) {
-                uint16_t w1, w2;
+                char16_t w1, w2;
 
                 /* see RFC 2781 section 2.2 */
 
@@ -329,7 +331,7 @@ char *utf16_to_utf8(const void *s, size_t length) {
                 f += 2;
 
                 if (!utf16_is_surrogate(w1)) {
-                        t += utf8_encode_unichar(t, w1);
+                        t += utf8_encode_unichar(t, (char32_t) w1);
 
                         continue;
                 }
@@ -373,7 +375,8 @@ static int utf8_unichar_to_encoded_len(int unichar) {
 
 /* validate one encoded unicode char and return its length */
 int utf8_encoded_valid_unichar(const char *str) {
-        int len, unichar, i;
+        int len, i;
+        char32_t unichar;
 
         assert(str);
 
diff --git a/src/basic/utf8.h b/src/basic/utf8.h
index e745649f06..20d38f12c8 100644
--- a/src/basic/utf8.h
+++ b/src/basic/utf8.h
@@ -22,12 +22,13 @@
 ***/
 
 #include <stdbool.h>
+#include <uchar.h>
 
 #include "macro.h"
 
 #define UTF8_REPLACEMENT_CHARACTER "\xef\xbf\xbd"
 
-bool unichar_is_valid(uint32_t c);
+bool unichar_is_valid(char32_t c);
 
 const char *utf8_is_valid(const char *s) _pure_;
 char *ascii_is_valid(const char *s) _pure_;
@@ -38,20 +39,20 @@ bool utf8_is_printable_newline(const char* str, size_t length, bool newline) _pu
 char *utf8_escape_invalid(const char *s);
 char *utf8_escape_non_printable(const char *str);
 
-size_t utf8_encode_unichar(char *out_utf8, uint32_t g);
+size_t utf8_encode_unichar(char *out_utf8, char32_t g);
 char *utf16_to_utf8(const void *s, size_t length);
 
 int utf8_encoded_valid_unichar(const char *str);
-int utf8_encoded_to_unichar(const char *str);
+char32_t utf8_encoded_to_unichar(const char *str);
 
-static inline bool utf16_is_surrogate(uint16_t c) {
+static inline bool utf16_is_surrogate(char16_t c) {
         return (0xd800 <= c && c <= 0xdfff);
 }
 
-static inline bool utf16_is_trailing_surrogate(uint16_t c) {
+static inline bool utf16_is_trailing_surrogate(char16_t c) {
         return (0xdc00 <= c && c <= 0xdfff);
 }
 
-static inline uint32_t utf16_surrogate_pair_to_unichar(uint16_t lead, uint16_t trail) {
+static inline char32_t utf16_surrogate_pair_to_unichar(char16_t lead, char16_t trail) {
                 return ((lead - 0xd800) << 10) + (trail - 0xdc00) + 0x10000;
 }