make taht shorter

Signed-off-by: Pierre Habouzit <madcoder@debian.org>

diff --git a/utf8.c b/utf8.c
index c25a84b..35faa6c 100644 (file)
--- a/utf8.c
+++ b/utf8.c
@@ -19,60 +19,30 @@
 #define EILSEQ EINVAL
 #endif
 
-int mutt_wctoutf8 (char *s, unsigned int c)
+int mutt_wctoutf8(char *p, unsigned int c)
 {
-  if (c < (1 << 7)) {
-    if (s)
-      *s++ = c;
-    return 1;
-  }
-  else if (c < (1 << 11)) {
-    if (s) {
-      *s++ = 0xc0 | (c >> 6);
-      *s++ = 0x80 | (c & 0x3f);
-    }
-    return 2;
-  }
-  else if (c < (1 << 16)) {
-    if (s) {
-      *s++ = 0xe0 | (c >> 12);
-      *s++ = 0x80 | ((c >> 6) & 0x3f);
-      *s++ = 0x80 | (c & 0x3f);
-    }
-    return 3;
-  }
-  else if (c < (1 << 21)) {
-    if (s) {
-      *s++ = 0xf0 | (c >> 18);
-      *s++ = 0x80 | ((c >> 12) & 0x3f);
-      *s++ = 0x80 | ((c >> 6) & 0x3f);
-      *s++ = 0x80 | (c & 0x3f);
-    }
-    return 4;
-  }
-  else if (c < (1 << 26)) {
-    if (s) {
-      *s++ = 0xf8 | (c >> 24);
-      *s++ = 0x80 | ((c >> 18) & 0x3f);
-      *s++ = 0x80 | ((c >> 12) & 0x3f);
-      *s++ = 0x80 | ((c >> 6) & 0x3f);
-      *s++ = 0x80 | (c & 0x3f);
+    static unsigned char const mark[7] = {
+        0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC
+    };
+
+    int bytes;
+
+    if (c >= 0x200000) {
+        errno = EILSEQ;
+        return -1;
     }
-    return 5;
-  }
-  else if (c < (1 << 31)) {
-    if (s) {
-      *s++ = 0xfc | (c >> 30);
-      *s++ = 0x80 | ((c >> 24) & 0x3f);
-      *s++ = 0x80 | ((c >> 18) & 0x3f);
-      *s++ = 0x80 | ((c >> 12) & 0x3f);
-      *s++ = 0x80 | ((c >> 6) & 0x3f);
-      *s++ = 0x80 | (c & 0x3f);
+
+    bytes = 1 + (c >= 0x80) + (c >= 0x800) + (c >= 0x10000);
+    p += bytes;
+
+    switch (bytes) {
+      case 4: *--p = (c | 0x80) & 0xbf; c >>= 6;
+      case 3: *--p = (c | 0x80) & 0xbf; c >>= 6;
+      case 2: *--p = (c | 0x80) & 0xbf; c >>= 6;
+      case 1: *--p =  c | mark[bytes];
     }
-    return 6;
-  }
-  errno = EILSEQ;
-  return -1;
+
+    return bytes;
 }
 
 #endif /* !HAVE_WC_FUNCS */