utf8.[ch] et al: 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.

[
 @zonque:
  * rebased to current master
  * use AC_CHECK_DECLS to detect availibility of char{16,32}_t
  * make utf8_encoded_to_unichar() return int
]

diff --git a/src/basic/string-util.c b/src/basic/string-util.c
index 6006767daac5b025fdb56e44fd28d82a2443f20b..2c9754db08f1955920e5f2a478d61ab5491b3f04 100644 (file)
--- a/src/basic/string-util.c
+++ b/src/basic/string-util.c
@@ -394,6 +394,7 @@ char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigne
         char *e;
         const char *i, *j;
         unsigned k, len, len2;
+        int r;
 
         assert(s);
         assert(percent <= 100);
@@ -413,10 +414,10 @@ 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)
+                r = utf8_encoded_to_unichar(i, &c);
+                if (r < 0)
                         return NULL;
                 k += unichar_iswide(c) ? 2 : 1;
         }
@@ -425,11 +426,11 @@ 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);
-                if (c < 0)
+                r = utf8_encoded_to_unichar(j, &c);
+                if (r < 0)
                         return NULL;
                 k += unichar_iswide(c) ? 2 : 1;
         }

diff --git a/src/basic/utf8.c b/src/basic/utf8.c
index 124effd6dfcd6694c055c45e66cce9162eca806a..3f024f7e581cbac7c604e98adf3ed8fc24440b5f 100644 (file)
--- a/src/basic/utf8.c
+++ b/src/basic/utf8.c
@@ -53,7 +53,7 @@
 #include "macro.h"
 #include "utf8.h"
 
-bool unichar_is_valid(uint32_t ch) {
+bool unichar_is_valid(char32_t ch) {
 
         if (ch >= 0x110000) /* End of unicode space */
                 return false;
@@ -67,7 +67,7 @@ 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.
@@ -103,8 +103,9 @@ 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;
+int utf8_encoded_to_unichar(const char *str, char32_t *ret_unichar) {
+        char32_t unichar;
+        int len, i;
 
         assert(str);
 
@@ -112,34 +113,37 @@ int utf8_encoded_to_unichar(const char *str) {
 
         switch (len) {
         case 1:
-                return (int)str[0];
+                *ret_unichar = (char32_t)str[0];
+                return 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;
+        *ret_unichar = unichar;
+
+        return 0;
 }
 
 bool utf8_is_printable_newline(const char* str, size_t length, bool newline) {
@@ -148,15 +152,16 @@ 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, r;
+                char32_t val;
 
                 encoded_len = utf8_encoded_valid_unichar(p);
                 if (encoded_len < 0 ||
                     (size_t) encoded_len > length)
                         return false;
 
-                val = utf8_encoded_to_unichar(p);
-                if (val < 0 ||
+                r = utf8_encoded_to_unichar(p, &val);
+                if (r < 0 ||
                     unichar_is_control(val) ||
                     (!newline && val == '\n'))
                         return false;
@@ -276,7 +281,7 @@ 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)
@@ -320,7 +325,7 @@ 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 */
 
@@ -354,7 +359,7 @@ char *utf16_to_utf8(const void *s, size_t length) {
 }
 
 /* expected size used to encode one unicode char */
-static int utf8_unichar_to_encoded_len(int unichar) {
+static int utf8_unichar_to_encoded_len(char32_t unichar) {
 
         if (unichar < 0x80)
                 return 1;
@@ -372,7 +377,8 @@ 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, r;
+        char32_t unichar;
 
         assert(str);
 
@@ -389,7 +395,9 @@ int utf8_encoded_valid_unichar(const char *str) {
                 if ((str[i] & 0x80) != 0x80)
                         return -EINVAL;
 
-        unichar = utf8_encoded_to_unichar(str);
+        r = utf8_encoded_to_unichar(str, &unichar);
+        if (r < 0)
+                return r;
 
         /* check if encoded length matches encoded value */
         if (utf8_unichar_to_encoded_len(unichar) != len)

diff --git a/src/basic/utf8.h b/src/basic/utf8.h
index 16c4b5b55da2eb1932c9acd3e14742d142b76085..3e2e35b96752cbfc7d9f6379fd57d6b8ac0774d5 100644 (file)
--- a/src/basic/utf8.h
+++ b/src/basic/utf8.h
@@ -24,12 +24,14 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <uchar.h>
 
 #include "macro.h"
+#include "missing.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_;
@@ -40,20 +42,20 @@ 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);
+int utf8_encoded_to_unichar(const char *str, char32_t *ret_unichar);
 
-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;
 }