/* Get descriptor for character set conversion. Copyright (C) 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <ctype.h> #include <errno.h> #include <iconv.h> #include <stdlib.h> #include <string.h> #include <gconv_int.h> static inline void strip (char *wp, const char *s) { int slash_count = 0; while (*s != '\0') { if (isalnum (*s) || *s == '_' || *s == '-' || *s == '.') *wp++ = *s; else if (*s == '/') { if (++slash_count == 3) break; *wp++ = '/'; } ++s; } while (slash_count++ < 2) *wp++ = '/'; *wp = '\0'; } iconv_t iconv_open (const char *tocode, const char *fromcode) { char *tocode_conv; char *fromcode_conv; size_t tocode_len; size_t fromcode_len; gconv_t cd; int res; /* Normalize the name. We remove all characters beside alpha-numeric, '_', '-', '/', and '.'. */ tocode_len = strlen (tocode); tocode_conv = alloca (tocode_len + 3); strip (tocode_conv, tocode); fromcode_len = strlen (fromcode); fromcode_conv = alloca (fromcode_len + 3); strip (fromcode_conv, fromcode); res = __gconv_open (tocode_conv[2] == '\0' ? tocode : tocode_conv, fromcode_conv[2] == '\0' ? fromcode : fromcode_conv, &cd); if (res != GCONV_OK) { /* We must set the error number according to the specs. */ if (res == GCONV_NOCONV || res == GCONV_NODB) __set_errno (EINVAL); return (iconv_t) -1; } return (iconv_t) cd; }