* 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.

3 files changed, 214 insertions, 138 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;
+}
diff --git a/libidn/iconvme.h b/libidn/iconvme.h
new file mode 100644
index 0000000000..3eb9b32b49
--- /dev/null
+++ b/libidn/iconvme.h
@@ -0,0 +1,25 @@
+/* Recode strings between character sets, using iconv.
+   Copyright (C) 2004 Free Software Foundation, Inc.
+   Written by Simon Josefsson.
+
+   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.  */
+
+#ifndef ICONVME_H
+# define ICONVME_H
+
+extern char *iconv_string (const char *string, const char *from_code,
+			   const char *to_code);
+
+#endif /* ICONVME_H */
diff --git a/libidn/toutf8.c b/libidn/toutf8.c
index 262f252d5f..dad47c9af0 100644
--- a/libidn/toutf8.c
+++ b/libidn/toutf8.c
@@ -1,5 +1,5 @@
-/* toutf8.c	Convert strings from system locale into UTF-8.
- * Copyright (C) 2002, 2003, 2004  Simon Josefsson
+/* toutf8.c --- Convert strings from system locale into UTF-8.
+ * Copyright (C) 2002, 2003, 2004, 2005  Simon Josefsson
  *
  * This file is part of GNU Libidn.
  *
@@ -23,33 +23,36 @@
 # include "config.h"
 #endif
 
+/* Get prototypes. */
+#include "stringprep.h"
+
+/* Get fprintf. */
 #include <stdio.h>
+
+/* Get getenv. */
 #include <stdlib.h>
+
+/* Get strlen. */
 #include <string.h>
-#include <errno.h>
-#include <sys/param.h>
 
-#include "stringprep.h"
+/* Get iconv_string. */
+#include "iconvme.h"
 
 #ifdef _LIBC
 # define HAVE_ICONV 1
 # define LOCALE_WORKS 1
-# define ICONV_CONST
 #endif
 
-#ifdef HAVE_ICONV
-# include <iconv.h>
-
-# if LOCALE_WORKS
-#  include <langinfo.h>
-#  include <locale.h>
-# endif
+#if LOCALE_WORKS
+# include <langinfo.h>
+# include <locale.h>
+#endif
 
-# ifdef _LIBC
-#  define stringprep_locale_charset() nl_langinfo (CODESET)
-# else
+#ifdef _LIBC
+# define stringprep_locale_charset() nl_langinfo (CODESET)
+#else
 /**
- * stringprep_locale_charset:
+ * stringprep_locale_charset - return charset used in current locale
  *
  * Find out current locale charset.  The function respect the CHARSET
  * environment variable, but typically uses nl_langinfo(CODESET) when
@@ -76,19 +79,19 @@ stringprep_locale_charset (void)
   if (charset && *charset)
     return charset;
 
-#  ifdef LOCALE_WORKS
+# ifdef LOCALE_WORKS
   charset = nl_langinfo (CODESET);
 
   if (charset && *charset)
     return charset;
-#  endif
+# endif
 
   return "ASCII";
 }
-# endif
+#endif
 
 /**
- * stringprep_convert:
+ * stringprep_convert - encode string using new character set
  * @str: input zero-terminated string.
  * @to_codeset: name of destination character set.
  * @from_codeset: name of origin character set, as used by @str.
@@ -103,132 +106,21 @@ char *
 stringprep_convert (const char *str,
 		    const char *to_codeset, const char *from_codeset)
 {
-  iconv_t cd;
-  char *dest;
-  char *outp;
-  ICONV_CONST char *p;
-  size_t inbytes_remaining;
-  size_t outbytes_remaining;
-  size_t err;
-  size_t outbuf_size;
-  int have_error = 0;
-
-  if (strcmp (to_codeset, from_codeset) == 0)
-    {
-#if defined HAVE_STRDUP || defined _LIBC
-      return strdup (str);
+#if HAVE_ICONV
+  return iconv_string (str, from_codeset, to_codeset);
 #else
-      char *p;
-      p = malloc (strlen (str) + 1);
-      if (!p)
-	return NULL;
-      return strcpy (p, str);
-#endif
-    }
-
-  cd = iconv_open (to_codeset, from_codeset);
-
-  if (cd == (iconv_t) - 1)
-    return NULL;
-
-  p = (ICONV_CONST char *) str;
-
-  inbytes_remaining = strlen (p);
-  /* Guess the maximum length the output string can have.  */
-  outbuf_size = (inbytes_remaining + 1) * MAX (7, MB_CUR_MAX);
-
-  outp = dest = malloc (outbuf_size);
-  if (dest == NULL)
-    goto out;
-  outbytes_remaining = outbuf_size - 1;	/* -1 for NUL */
-
-again:
-
-  err = iconv (cd, (ICONV_CONST char **) &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;
-	    char *newdest;
-
-	    outbuf_size *= 2;
-	    newdest = realloc (dest, outbuf_size);
-	    if (newdest == NULL)
-	      {
-		have_error = 1;
-		goto out;
-	      }
-	    dest = newdest;
-
-	    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';
-
-  if (*p != '\0')
-    have_error = 1;
-
- out:
-  iconv_close (cd);
-
-  if (have_error)
-    {
-      free (dest);
-      dest = NULL;
-    }
-
-  return dest;
-}
-
-#else /* HAVE_ICONV */
-
-const char *
-stringprep_locale_charset ()
-{
-  return "ASCII";
-}
-
-char *
-stringprep_convert (const char *str,
-		    const char *to_codeset, const char *from_codeset)
-{
   char *p;
   fprintf (stderr, "libidn: warning: libiconv not installed, cannot "
 	   "convert data to UTF-8\n");
   p = malloc (strlen (str) + 1);
   if (!p)
     return NULL;
-  strcpy (p, str);
-  return p;
+  return strcpy (p, str);
+#endif
 }
 
-#endif /* HAVE_ICONV */
-
 /**
- * stringprep_locale_to_utf8:
+ * stringprep_locale_to_utf8 - convert locale encoded string to UTF-8
  * @str: input zero terminated string.
  *
  * Convert string encoded in the locale's character set into UTF-8 by
@@ -244,7 +136,7 @@ stringprep_locale_to_utf8 (const char *str)
 }
 
 /**
- * stringprep_utf8_to_locale:
+ * stringprep_utf8_to_locale - encode UTF-8 string to locale encoding
  * @str: input zero terminated string.
  *
  * Convert string encoded in UTF-8 into the locale's character set by