101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/* Get descriptor for character set conversion.
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Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <ctype.h>
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#include <errno.h>
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#include <iconv.h>
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#include <stdlib.h>
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#include <string.h>
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#include <gconv_int.h>
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static inline void
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strip (char *wp, const char *s)
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{
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int slash_count = 0;
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while (*s != '\0')
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{
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if (isalnum (*s) || *s == '_' || *s == '-' || *s == '.')
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*wp++ = toupper (*s);
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else if (*s == '/')
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{
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if (++slash_count == 3)
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break;
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*wp++ = '/';
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}
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++s;
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}
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while (slash_count++ < 2)
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*wp++ = '/';
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*wp = '\0';
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}
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static char *
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upstr (char *dst, const char *str)
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{
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char *cp = dst;
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while ((*cp++ = toupper (*str++)) != '\0')
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/* nothing */;
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return dst;
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}
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iconv_t
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iconv_open (const char *tocode, const char *fromcode)
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{
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char *tocode_conv;
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char *fromcode_conv;
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size_t tocode_len;
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size_t fromcode_len;
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__gconv_t cd;
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int res;
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/* Normalize the name. We remove all characters beside alpha-numeric,
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'_', '-', '/', and '.'. */
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tocode_len = strlen (tocode);
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tocode_conv = alloca (tocode_len + 3);
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strip (tocode_conv, tocode);
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tocode = tocode_conv[2] == '\0' ? upstr (tocode_conv, tocode) : tocode_conv;
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fromcode_len = strlen (fromcode);
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fromcode_conv = alloca (fromcode_len + 3);
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strip (fromcode_conv, fromcode);
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fromcode = (fromcode_conv[2] == '\0'
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? upstr (fromcode_conv, fromcode) : fromcode_conv);
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res = __gconv_open (tocode, fromcode, &cd, 0);
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if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
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{
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/* We must set the error number according to the specs. */
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if (res == __GCONV_NOCONV || res == __GCONV_NODB)
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__set_errno (EINVAL);
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return (iconv_t) -1;
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}
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return (iconv_t) cd;
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}
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