* iconvme.h: New file, extracted from toutf8.c but improved.

	* iconvme.c: New file.
	* toutf8.c: Include stringprep.h first, to make the compiler check
	that stringprep.h is standalone.  Improve comments.  Replace
	#include of errno.h and sys/param.h with iconvme.h.  Don't define
	ICONV_CONST.
	(stringprep_convert): Rewrite to use iconvme.h.

1 files changed, 159 insertions, 0 deletions

diff --git a/libidn/iconvme.c b/libidn/iconvme.c
new file mode 100644
index 0000000000..daf0c8e349
--- /dev/null
+++ b/libidn/iconvme.c
@@ -0,0 +1,159 @@
+/* Recode strings between character sets, using iconv.
+   Copyright (C) 2002, 2003, 2004, 2005 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 2.1, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+/* Get prototype. */
+#include "iconvme.h"
+
+/* Get malloc. */
+#include <stdlib.h>
+
+/* Get strcmp. */
+#include <string.h>
+
+/* Get errno. */
+#include <errno.h>
+
+#ifdef _LIBC
+# define HAVE_ICONV 1
+#else
+/* Get strdup. */
+# include "strdup.h"
+#endif
+
+#if HAVE_ICONV
+/* Get iconv etc. */
+# include <iconv.h>
+/* Get MB_LEN_MAX. */
+# include <limits.h>
+#endif
+
+/* Convert a zero-terminated string STR from the FROM_CODSET code set
+   to the TO_CODESET code set.  The returned string is allocated using
+   malloc, and must be dellocated by the caller using free.  On
+   failure, NULL is returned and errno holds the error reason.  Note
+   that if TO_CODESET uses \0 for anything but to terminate the
+   string, the caller of this function may have difficulties finding
+   out the length of the output string.  */
+char *
+iconv_string (const char *str, const char *from_codeset,
+	      const char *to_codeset)
+{
+  char *dest = NULL;
+#if HAVE_ICONV
+  iconv_t cd;
+  char *outp;
+  char *p = (char *) str;
+  size_t inbytes_remaining = strlen (p);
+  /* Guess the maximum length the output string can have.  */
+  size_t outbuf_size = (inbytes_remaining + 1) * MB_LEN_MAX;
+  size_t outbytes_remaining = outbuf_size - 1; /* -1 for NUL */
+  size_t err;
+  int have_error = 0;
+#endif
+
+  if (strcmp (to_codeset, from_codeset) == 0)
+    return strdup (str);
+
+#if HAVE_ICONV
+  cd = iconv_open (to_codeset, from_codeset);
+  if (cd == (iconv_t) -1)
+    return NULL;
+
+  outp = dest = (char *) malloc (outbuf_size);
+  if (dest == NULL)
+    goto out;
+
+again:
+  err = iconv (cd, &p, &inbytes_remaining, &outp, &outbytes_remaining);
+
+  if (err == (size_t) - 1)
+    {
+      switch (errno)
+	{
+	case EINVAL:
+	  /* Incomplete text, do not report an error */
+	  break;
+
+	case E2BIG:
+	  {
+	    size_t used = outp - dest;
+	    size_t newsize = outbuf_size * 2;
+	    char *newdest;
+
+	    if (newsize <= outbuf_size)
+	      {
+		errno = ENOMEM;
+		have_error = 1;
+		goto out;
+	      }
+	    newdest = (char *) realloc (dest, newsize);
+	    if (newdest == NULL)
+	      {
+		have_error = 1;
+		goto out;
+	      }
+	    dest = newdest;
+	    outbuf_size = newsize;
+
+	    outp = dest + used;
+	    outbytes_remaining = outbuf_size - used - 1;	/* -1 for NUL */
+
+	    goto again;
+	  }
+	  break;
+
+	case EILSEQ:
+	  have_error = 1;
+	  break;
+
+	default:
+	  have_error = 1;
+	  break;
+	}
+    }
+
+  *outp = '\0';
+
+out:
+  {
+    int save_errno = errno;
+
+    if (iconv_close (cd) < 0 && !have_error)
+      {
+	/* If we didn't have a real error before, make sure we restore
+	   the iconv_close error below. */
+	save_errno = errno;
+	have_error = 1;
+      }
+
+    if (have_error && dest)
+      {
+	free (dest);
+	dest = NULL;
+	errno = save_errno;
+      }
+  }
+#else
+  errno = ENOSYS;
+#endif
+
+  return dest;
+}