777bc09586
* 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.
160 lines
3.5 KiB
C
160 lines
3.5 KiB
C
/* Recode strings between character sets, using iconv.
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Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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/* Get prototype. */
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#include "iconvme.h"
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/* Get malloc. */
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#include <stdlib.h>
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/* Get strcmp. */
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#include <string.h>
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/* Get errno. */
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#include <errno.h>
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#ifdef _LIBC
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# define HAVE_ICONV 1
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#else
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/* Get strdup. */
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# include "strdup.h"
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#endif
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#if HAVE_ICONV
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/* Get iconv etc. */
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# include <iconv.h>
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/* Get MB_LEN_MAX. */
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# include <limits.h>
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#endif
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/* Convert a zero-terminated string STR from the FROM_CODSET code set
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to the TO_CODESET code set. The returned string is allocated using
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malloc, and must be dellocated by the caller using free. On
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failure, NULL is returned and errno holds the error reason. Note
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that if TO_CODESET uses \0 for anything but to terminate the
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string, the caller of this function may have difficulties finding
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out the length of the output string. */
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char *
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iconv_string (const char *str, const char *from_codeset,
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const char *to_codeset)
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{
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char *dest = NULL;
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#if HAVE_ICONV
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iconv_t cd;
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char *outp;
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char *p = (char *) str;
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size_t inbytes_remaining = strlen (p);
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/* Guess the maximum length the output string can have. */
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size_t outbuf_size = (inbytes_remaining + 1) * MB_LEN_MAX;
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size_t outbytes_remaining = outbuf_size - 1; /* -1 for NUL */
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size_t err;
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int have_error = 0;
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#endif
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if (strcmp (to_codeset, from_codeset) == 0)
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return strdup (str);
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#if HAVE_ICONV
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cd = iconv_open (to_codeset, from_codeset);
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if (cd == (iconv_t) -1)
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return NULL;
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outp = dest = (char *) malloc (outbuf_size);
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if (dest == NULL)
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goto out;
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again:
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err = iconv (cd, &p, &inbytes_remaining, &outp, &outbytes_remaining);
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if (err == (size_t) - 1)
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{
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switch (errno)
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{
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case EINVAL:
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/* Incomplete text, do not report an error */
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break;
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case E2BIG:
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{
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size_t used = outp - dest;
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size_t newsize = outbuf_size * 2;
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char *newdest;
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if (newsize <= outbuf_size)
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{
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errno = ENOMEM;
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have_error = 1;
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goto out;
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}
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newdest = (char *) realloc (dest, newsize);
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if (newdest == NULL)
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{
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have_error = 1;
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goto out;
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}
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dest = newdest;
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outbuf_size = newsize;
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outp = dest + used;
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outbytes_remaining = outbuf_size - used - 1; /* -1 for NUL */
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goto again;
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}
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break;
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case EILSEQ:
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have_error = 1;
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break;
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default:
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have_error = 1;
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break;
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}
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}
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*outp = '\0';
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out:
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{
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int save_errno = errno;
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if (iconv_close (cd) < 0 && !have_error)
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{
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/* If we didn't have a real error before, make sure we restore
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the iconv_close error below. */
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save_errno = errno;
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have_error = 1;
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}
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if (have_error && dest)
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{
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free (dest);
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dest = NULL;
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errno = save_errno;
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}
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}
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#else
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errno = ENOSYS;
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#endif
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return dest;
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}
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