New module 'uniconv/u8-conv-to-enc'.

[gnulib.git] / lib / uniconv / u8-conv-to-enc.c

diff --git a/lib/uniconv/u8-conv-to-enc.c b/lib/uniconv/u8-conv-to-enc.c
new file mode 100644 (file)
index 0000000..6865284
--- /dev/null
+++ b/lib/uniconv/u8-conv-to-enc.c
@@ -0,0 +1,77 @@
+/* Conversion from UTF-8 to legacy encodings.
+   Copyright (C) 2002, 2006-2007 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library 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.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "uniconv.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "c-strcaseeq.h"
+#include "striconveha.h"
+#include "unistr.h"
+
+int
+u8_conv_to_encoding (const char *tocode,
+                    enum iconv_ilseq_handler handler,
+                    const uint8_t *src, size_t srclen,
+                    size_t *offsets,
+                    char **resultp, size_t *lengthp)
+{
+  char *result;
+
+  if (STRCASEEQ (tocode, "UTF-8", 'U','T','F','-','8',0,0,0,0))
+    {
+      /* Conversion from UTF-8 to UTF-8.  No need to go through iconv().  */
+#if CONFIG_UNICODE_SAFETY
+      if (u8_check (src, srclen))
+       {
+         errno = EILSEQ;
+         return -1;
+       }
+#endif
+
+      /* Memory allocation.  */
+      if (*resultp != NULL && *lengthp >= srclen)
+       result = *resultp;
+      else
+       {
+         result = (char *) malloc (srclen);
+         if (result == NULL)
+           {
+             errno = ENOMEM;
+             return -1;
+           }
+       }
+
+      memcpy (result, (const char *) src, srclen);
+      *resultp = result;
+      *lengthp = srclen;
+      return 0;
+    }
+  else
+    return mem_iconveha ((const char *) src, srclen,
+                        "UTF-8", tocode,
+                        handler == iconveh_question_mark, handler,
+                        offsets, resultp, lengthp);
+}