1 /* Recode strings between character sets, using iconv.
2 Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public License as
6 published by the Free Software Foundation; either version 2.1, or (at
7 your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public License along
15 with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
48 /* Convert a zero-terminated string STR from the FROM_CODSET code set
49 to the TO_CODESET code set. The returned string is allocated using
50 malloc, and must be dellocated by the caller using free. On
51 failure, NULL is returned and errno holds the error reason. Note
52 that if TO_CODESET uses \0 for anything but to terminate the
53 string, the caller of this function may have difficulties finding
54 out the length of the output string. */
56 iconv_string (const char *str, const char *from_codeset,
57 const char *to_codeset)
63 char *p = (char *) str;
64 size_t inbytes_remaining = strlen (p);
65 /* Guess the maximum length the output string can have. */
66 size_t outbuf_size = (inbytes_remaining + 1) * MB_LEN_MAX;
67 size_t outbytes_remaining = outbuf_size - 1; /* -1 for NUL */
71 if (1 < MB_LEN_MAX && SIZE_MAX / MB_LEN_MAX <= inbytes_remaining)
78 if (strcmp (to_codeset, from_codeset) == 0)
82 cd = iconv_open (to_codeset, from_codeset);
83 if (cd == (iconv_t) -1)
86 outp = dest = (char *) malloc (outbuf_size);
91 err = iconv (cd, &p, &inbytes_remaining, &outp, &outbytes_remaining);
93 if (err == (size_t) - 1)
98 /* Incomplete text, do not report an error */
103 size_t used = outp - dest;
104 size_t newsize = outbuf_size * 2;
107 if (newsize <= outbuf_size)
113 newdest = (char *) realloc (dest, newsize);
120 outbuf_size = newsize;
123 outbytes_remaining = outbuf_size - used - 1; /* -1 for NUL */
143 int save_errno = errno;
145 if (iconv_close (cd) < 0 && !have_error)
147 /* If we didn't have a real error before, make sure we restore
148 the iconv_close error below. */
153 if (have_error && dest)