X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Funistr%2Fu8-mbtouc.c;h=a62539e639e53ceeb7ebddadc67c6458eb887167;hb=56c2804916c20464b13800341b426536c842191d;hp=2c292796486ec34b783b4476a9cae94cb8e6f6ee;hpb=2d4d7d9d00fe33b6f5291e00a30b6c1016775b74;p=gnulib.git

diff --git a/lib/unistr/u8-mbtouc.c b/lib/unistr/u8-mbtouc.c
index 2c2927964..a62539e63 100644
--- a/lib/unistr/u8-mbtouc.c
+++ b/lib/unistr/u8-mbtouc.c
@@ -1,5 +1,5 @@
 /* Look at first character in UTF-8 string.
-   Copyright (C) 1999-2002, 2006-2007, 2009 Free Software Foundation, Inc.
+   Copyright (C) 1999-2002, 2006-2007, 2009-2011 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2001.
 
    This program is free software: you can redistribute it and/or modify it
@@ -55,21 +55,32 @@ u8_mbtouc (ucs4_t *puc, const uint8_t *s, size_t n)
             {
               /* incomplete multibyte character */
               *puc = 0xfffd;
-              return n;
+              return 1;
             }
         }
       else if (c < 0xf0)
         {
           if (n >= 3)
             {
-              if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
-                  && (c >= 0xe1 || s[1] >= 0xa0)
-                  && (c != 0xed || s[1] < 0xa0))
+              if ((s[1] ^ 0x80) < 0x40)
                 {
-                  *puc = ((unsigned int) (c & 0x0f) << 12)
-                         | ((unsigned int) (s[1] ^ 0x80) << 6)
-                         | (unsigned int) (s[2] ^ 0x80);
-                  return 3;
+                  if ((s[2] ^ 0x80) < 0x40)
+                    {
+                      if ((c >= 0xe1 || s[1] >= 0xa0)
+                          && (c != 0xed || s[1] < 0xa0))
+                        {
+                          *puc = ((unsigned int) (c & 0x0f) << 12)
+                                 | ((unsigned int) (s[1] ^ 0x80) << 6)
+                                 | (unsigned int) (s[2] ^ 0x80);
+                          return 3;
+                        }
+                      /* invalid multibyte character */
+                      *puc = 0xfffd;
+                      return 3;
+                    }
+                  /* invalid multibyte character */
+                  *puc = 0xfffd;
+                  return 2;
                 }
               /* invalid multibyte character */
             }
@@ -77,26 +88,45 @@ u8_mbtouc (ucs4_t *puc, const uint8_t *s, size_t n)
             {
               /* incomplete multibyte character */
               *puc = 0xfffd;
-              return n;
+              if (n == 1 || (s[1] ^ 0x80) >= 0x40)
+                return 1;
+              else
+                return 2;
             }
         }
       else if (c < 0xf8)
         {
           if (n >= 4)
             {
-              if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
-                  && (s[3] ^ 0x80) < 0x40
-                  && (c >= 0xf1 || s[1] >= 0x90)
+              if ((s[1] ^ 0x80) < 0x40)
+                {
+                  if ((s[2] ^ 0x80) < 0x40)
+                    {
+                      if ((s[3] ^ 0x80) < 0x40)
+                        {
+                          if ((c >= 0xf1 || s[1] >= 0x90)
 #if 1
-                  && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))
+                              && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))
 #endif
-                 )
-                {
-                  *puc = ((unsigned int) (c & 0x07) << 18)
-                         | ((unsigned int) (s[1] ^ 0x80) << 12)
-                         | ((unsigned int) (s[2] ^ 0x80) << 6)
-                         | (unsigned int) (s[3] ^ 0x80);
-                  return 4;
+                             )
+                            {
+                              *puc = ((unsigned int) (c & 0x07) << 18)
+                                     | ((unsigned int) (s[1] ^ 0x80) << 12)
+                                     | ((unsigned int) (s[2] ^ 0x80) << 6)
+                                     | (unsigned int) (s[3] ^ 0x80);
+                              return 4;
+                            }
+                          /* invalid multibyte character */
+                          *puc = 0xfffd;
+                          return 4;
+                        }
+                      /* invalid multibyte character */
+                      *puc = 0xfffd;
+                      return 3;
+                    }
+                  /* invalid multibyte character */
+                  *puc = 0xfffd;
+                  return 2;
                 }
               /* invalid multibyte character */
             }
@@ -104,7 +134,12 @@ u8_mbtouc (ucs4_t *puc, const uint8_t *s, size_t n)
             {
               /* incomplete multibyte character */
               *puc = 0xfffd;
-              return n;
+              if (n == 1 || (s[1] ^ 0x80) >= 0x40)
+                return 1;
+              else if (n == 2 || (s[2] ^ 0x80) >= 0x40)
+                return 2;
+              else
+                return 3;
             }
         }
 #if 0
@@ -112,16 +147,37 @@ u8_mbtouc (ucs4_t *puc, const uint8_t *s, size_t n)
         {
           if (n >= 5)
             {
-              if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
-                  && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
-                  && (c >= 0xf9 || s[1] >= 0x88))
+              if ((s[1] ^ 0x80) < 0x40)
                 {
-                  *puc = ((unsigned int) (c & 0x03) << 24)
-                         | ((unsigned int) (s[1] ^ 0x80) << 18)
-                         | ((unsigned int) (s[2] ^ 0x80) << 12)
-                         | ((unsigned int) (s[3] ^ 0x80) << 6)
-                         | (unsigned int) (s[4] ^ 0x80);
-                  return 5;
+                  if ((s[2] ^ 0x80) < 0x40)
+                    {
+                      if ((s[3] ^ 0x80) < 0x40)
+                        {
+                          if ((s[4] ^ 0x80) < 0x40)
+                            {
+                              if (c >= 0xf9 || s[1] >= 0x88)
+                                {
+                                  *puc = ((unsigned int) (c & 0x03) << 24)
+                                         | ((unsigned int) (s[1] ^ 0x80) << 18)
+                                         | ((unsigned int) (s[2] ^ 0x80) << 12)
+                                         | ((unsigned int) (s[3] ^ 0x80) << 6)
+                                         | (unsigned int) (s[4] ^ 0x80);
+                                  return 5;
+                                }
+                              /* invalid multibyte character */
+                              *puc = 0xfffd;
+                              return 5;
+                            }
+                          /* invalid multibyte character */
+                          *puc = 0xfffd;
+                          return 4;
+                        }
+                      /* invalid multibyte character */
+                      *puc = 0xfffd;
+                      return 3;
+                    }
+                  /* invalid multibyte character */
+                  return 2;
                 }
               /* invalid multibyte character */
             }
@@ -136,18 +192,44 @@ u8_mbtouc (ucs4_t *puc, const uint8_t *s, size_t n)
         {
           if (n >= 6)
             {
-              if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
-                  && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
-                  && (s[5] ^ 0x80) < 0x40
-                  && (c >= 0xfd || s[1] >= 0x84))
+              if ((s[1] ^ 0x80) < 0x40)
                 {
-                  *puc = ((unsigned int) (c & 0x01) << 30)
-                         | ((unsigned int) (s[1] ^ 0x80) << 24)
-                         | ((unsigned int) (s[2] ^ 0x80) << 18)
-                         | ((unsigned int) (s[3] ^ 0x80) << 12)
-                         | ((unsigned int) (s[4] ^ 0x80) << 6)
-                         | (unsigned int) (s[5] ^ 0x80);
-                  return 6;
+                  if ((s[2] ^ 0x80) < 0x40)
+                    {
+                      if ((s[3] ^ 0x80) < 0x40)
+                        {
+                          if ((s[4] ^ 0x80) < 0x40)
+                            {
+                              if ((s[5] ^ 0x80) < 0x40)
+                                {
+                                  if (c >= 0xfd || s[1] >= 0x84)
+                                    {
+                                      *puc = ((unsigned int) (c & 0x01) << 30)
+                                             | ((unsigned int) (s[1] ^ 0x80) << 24)
+                                             | ((unsigned int) (s[2] ^ 0x80) << 18)
+                                             | ((unsigned int) (s[3] ^ 0x80) << 12)
+                                             | ((unsigned int) (s[4] ^ 0x80) << 6)
+                                             | (unsigned int) (s[5] ^ 0x80);
+                                      return 6;
+                                    }
+                                  /* invalid multibyte character */
+                                  *puc = 0xfffd;
+                                  return 6;
+                                }
+                              /* invalid multibyte character */
+                              *puc = 0xfffd;
+                              return 5;
+                            }
+                          /* invalid multibyte character */
+                          *puc = 0xfffd;
+                          return 4;
+                        }
+                      /* invalid multibyte character */
+                      *puc = 0xfffd;
+                      return 3;
+                    }
+                  /* invalid multibyte character */
+                  return 2;
                 }
               /* invalid multibyte character */
             }