aboutsummaryrefslogtreecommitdiff
path: root/libidn/iconvme.c
diff options
context:
space:
mode:
Diffstat (limited to 'libidn/iconvme.c')
-rw-r--r--libidn/iconvme.c171
1 files changed, 171 insertions, 0 deletions
diff --git a/libidn/iconvme.c b/libidn/iconvme.c
new file mode 100644
index 0000000..cc4dd1d
--- /dev/null
+++ b/libidn/iconvme.c
@@ -0,0 +1,171 @@
+/* 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, CHAR_BIT. */
+# include <limits.h>
+#endif
+
+#ifndef SIZE_MAX
+# define SIZE_MAX ((size_t) -1)
+#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;
+ size_t outbytes_remaining;
+ size_t err;
+ int have_error = 0;
+
+ /* Use a worst-case output size guess, so long as that wouldn't be
+ too large for comfort. It's OK if the guess is wrong so long as
+ it's nonzero. */
+ size_t approx_sqrt_SIZE_MAX = SIZE_MAX >> (sizeof (size_t) * CHAR_BIT / 2);
+ if (outbuf_size <= approx_sqrt_SIZE_MAX / MB_LEN_MAX)
+ outbuf_size *= MB_LEN_MAX;
+ outbytes_remaining = outbuf_size - 1;
+#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;
+}