Update.
[glibc.git] / iconv / iconv_open.c
blob7f06947c9a9b1ce52a2bcdaa446b7f2bd5b4b98b
1 /* Get descriptor for character set conversion.
2 Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 #include <ctype.h>
22 #include <errno.h>
23 #include <iconv.h>
24 #include <stdlib.h>
25 #include <string.h>
27 #include <gconv_int.h>
30 static inline void
31 strip (char *wp, const char *s)
33 int slash_count = 0;
35 while (*s != '\0')
37 if (isalnum (*s) || *s == '_' || *s == '-' || *s == '.')
38 *wp++ = toupper (*s);
39 else if (*s == '/')
41 if (++slash_count == 3)
42 break;
43 *wp++ = '/';
45 ++s;
48 while (slash_count++ < 2)
49 *wp++ = '/';
51 *wp = '\0';
55 static char *
56 upstr (char *dst, const char *str)
58 char *cp = dst;
59 while ((*cp++ = toupper (*str++)) != '\0')
60 /* nothing */;
61 return dst;
65 iconv_t
66 iconv_open (const char *tocode, const char *fromcode)
68 char *tocode_conv;
69 char *fromcode_conv;
70 size_t tocode_len;
71 size_t fromcode_len;
72 __gconv_t cd;
73 int res;
75 /* Normalize the name. We remove all characters beside alpha-numeric,
76 '_', '-', '/', and '.'. */
77 tocode_len = strlen (tocode);
78 tocode_conv = alloca (tocode_len + 3);
79 strip (tocode_conv, tocode);
80 tocode = tocode_conv[2] == '\0' ? upstr (tocode_conv, tocode) : tocode_conv;
82 fromcode_len = strlen (fromcode);
83 fromcode_conv = alloca (fromcode_len + 3);
84 strip (fromcode_conv, fromcode);
85 fromcode = (fromcode_conv[2] == '\0'
86 ? upstr (fromcode_conv, fromcode) : fromcode_conv);
88 res = __gconv_open (tocode, fromcode, &cd, 0);
90 if (__builtin_expect (res, __GCONV_OK) != __GCONV_OK)
92 /* We must set the error number according to the specs. */
93 if (res == __GCONV_NOCONV || res == __GCONV_NODB)
94 __set_errno (EINVAL);
96 return (iconv_t) -1;
99 return (iconv_t) cd;