Imported Upstream version 0.9.1upstream/0.9.1

1 files changed, 172 insertions, 0 deletions

diff --git a/lib/iconv_open.c b/lib/iconv_open.c
new file mode 100644
index 00000000..3d873acd
--- /dev/null
+++ b/lib/iconv_open.c
@@ -0,0 +1,172 @@
+/* Character set conversion.
+   Copyright (C) 2007 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License along
+   with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <iconv.h>
+
+#include <errno.h>
+#include <string.h>
+#include "c-ctype.h"
+#include "c-strcase.h"
+
+#define SIZEOF(a) (sizeof(a) / sizeof(a[0]))
+
+/* Namespace cleanliness.  */
+#define mapping_lookup rpl_iconv_open_mapping_lookup
+
+/* The macro ICONV_FLAVOR is defined to one of these or undefined.  */
+
+#define ICONV_FLAVOR_AIX "iconv_open-aix.h"
+#define ICONV_FLAVOR_HPUX "iconv_open-hpux.h"
+#define ICONV_FLAVOR_IRIX "iconv_open-irix.h"
+#define ICONV_FLAVOR_OSF "iconv_open-osf.h"
+
+#ifdef ICONV_FLAVOR
+# include ICONV_FLAVOR
+#endif
+
+iconv_t
+rpl_iconv_open (const char *tocode, const char *fromcode)
+#undef iconv_open
+{
+  char fromcode_upper[32];
+  char tocode_upper[32];
+  char *fromcode_upper_end;
+  char *tocode_upper_end;
+
+#if REPLACE_ICONV_UTF
+  /* Special handling of conversion between UTF-8 and UTF-{16,32}{BE,LE}.
+     Do this here, before calling the real iconv_open(), because  OSF/1 5.1
+     iconv() to these encoding inserts a BOM, which is wrong.
+     We do not need to handle conversion between arbitrary encodings and
+     UTF-{16,32}{BE,LE}, because the 'striconveh' module implements two-step
+     conversion throough UTF-8.
+     The _ICONV_* constants are chosen to be disjoint from any iconv_t
+     returned by the system's iconv_open() functions.  Recall that iconv_t
+     is a scalar type.  */
+  if (c_toupper (fromcode[0]) == 'U'
+      && c_toupper (fromcode[1]) == 'T'
+      && c_toupper (fromcode[2]) == 'F'
+      && fromcode[3] == '-')
+    {
+      if (c_toupper (tocode[0]) == 'U'
+	  && c_toupper (tocode[1]) == 'T'
+	  && c_toupper (tocode[2]) == 'F'
+	  && tocode[3] == '-')
+	{
+	  if (strcmp (fromcode + 4, "8") == 0)
+	    {
+	      if (c_strcasecmp (tocode + 4, "16BE") == 0)
+		return _ICONV_UTF8_UTF16BE;
+	      if (c_strcasecmp (tocode + 4, "16LE") == 0)
+		return _ICONV_UTF8_UTF16LE;
+	      if (c_strcasecmp (tocode + 4, "32BE") == 0)
+		return _ICONV_UTF8_UTF32BE;
+	      if (c_strcasecmp (tocode + 4, "32LE") == 0)
+		return _ICONV_UTF8_UTF32LE;
+	    }
+	  else if (strcmp (tocode + 4, "8") == 0)
+	    {
+	      if (c_strcasecmp (fromcode + 4, "16BE") == 0)
+		return _ICONV_UTF16BE_UTF8;
+	      if (c_strcasecmp (fromcode + 4, "16LE") == 0)
+		return _ICONV_UTF16LE_UTF8;
+	      if (c_strcasecmp (fromcode + 4, "32BE") == 0)
+		return _ICONV_UTF32BE_UTF8;
+	      if (c_strcasecmp (fromcode + 4, "32LE") == 0)
+		return _ICONV_UTF32LE_UTF8;
+	    }
+	}
+    }
+#endif
+
+  /* Do *not* add special support for 8-bit encodings like ASCII or ISO-8859-1
+     here.  This would lead to programs that work in some locales (such as the
+     "C" or "en_US" locales) but do not work in East Asian locales.  It is
+     better if programmers make their programs depend on GNU libiconv (except
+     on glibc systems), e.g. by using the AM_ICONV macro and documenting the
+     dependency in an INSTALL or DEPENDENCIES file.  */
+
+  /* Try with the original names first.
+     This covers the case when fromcode or tocode is a lowercase encoding name
+     that is understood by the system's iconv_open but not listed in our
+     mappings table.  */
+  {
+    iconv_t cd = iconv_open (tocode, fromcode);
+    if (cd != (iconv_t)(-1))
+      return cd;
+  }
+
+  /* Convert the encodings to upper case, because
+       1. in the arguments of iconv_open() on AIX, HP-UX, and OSF/1 the case
+	  matters,
+       2. it makes searching in the table faster.  */
+  {
+    const char *p = fromcode;
+    char *q = fromcode_upper;
+    while ((*q = c_toupper (*p)) != '\0')
+      {
+	p++;
+	q++;
+	if (q == &fromcode_upper[SIZEOF (fromcode_upper)])
+	  {
+	    errno = EINVAL;
+	    return (iconv_t)(-1);
+	  }
+      }
+    fromcode_upper_end = q;
+  }
+
+  {
+    const char *p = tocode;
+    char *q = tocode_upper;
+    while ((*q = c_toupper (*p)) != '\0')
+      {
+	p++;
+	q++;
+	if (q == &tocode_upper[SIZEOF (tocode_upper)])
+	  {
+	    errno = EINVAL;
+	    return (iconv_t)(-1);
+	  }
+      }
+    tocode_upper_end = q;
+  }
+
+#ifdef ICONV_FLAVOR
+  /* Apply the mappings.  */
+  {
+    const struct mapping *m =
+      mapping_lookup (fromcode_upper, fromcode_upper_end - fromcode_upper);
+
+    fromcode = (m != NULL ? m->vendor_name : fromcode_upper);
+  }
+  {
+    const struct mapping *m =
+      mapping_lookup (tocode_upper, tocode_upper_end - tocode_upper);
+
+    tocode = (m != NULL ? m->vendor_name : tocode_upper);
+  }
+#else
+  fromcode = fromcode_upper;
+  tocode = tocode_upper;
+#endif
+
+  return iconv_open (tocode, fromcode);
+}