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glibc/libidn/idn-stub.c
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/* idn-stub.c --- Stub to dlopen libcidn.so and invoke idna_to_ascii_lz. | |
* Copyright (C) 2003, 2004 Simon Josefsson | |
* | |
* This file is part of GNU Libidn. | |
* | |
* GNU Libidn is free software; you can redistribute it and/or | |
* modify it under the terms of the GNU Lesser General Public | |
* License as published by the Free Software Foundation; either | |
* version 2.1 of the License, or (at your option) any later version. | |
* | |
* GNU Libidn 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 | |
* Lesser General Public License for more details. | |
* | |
* You should have received a copy of the GNU Lesser General Public | |
* License along with GNU Libidn; if not, see <http://www.gnu.org/licenses/>. | |
*/ | |
#include <ctype.h> | |
#include <stdio.h> | |
#include <string.h> | |
#include <dlfcn.h> | |
#include <gnu/lib-names.h> | |
#include <bits/libc-lock.h> | |
/* Get specification for idna_to_ascii_lz. */ | |
#include "idna.h" | |
/* Handle of the libidn DSO. */ | |
static void *h; | |
static int (*to_ascii_lz) (const char *input, char **output, int flags); | |
static int (*to_unicode_lzlz) (const char *input, char **output, int flags); | |
static void | |
load_dso (void) | |
{ | |
/* Lock protecting the DSO loading. */ | |
__libc_lock_define_initialized (static, lock); | |
__libc_lock_lock (lock); | |
/* Retest in case some other thread arrived here at the same time. */ | |
if (h == NULL) | |
{ | |
h = __libc_dlopen (LIBCIDN_SO); | |
if (h == NULL) | |
h = (void *) 1l; | |
else | |
{ | |
/* Get the function we are interested in. */ | |
to_ascii_lz = __libc_dlsym (h, "idna_to_ascii_lz"); | |
to_unicode_lzlz = __libc_dlsym (h, "idna_to_unicode_lzlz"); | |
if (to_ascii_lz == NULL || to_unicode_lzlz == NULL) | |
{ | |
__libc_dlclose (h); | |
h = (void *) 1l; | |
} | |
} | |
} | |
__libc_lock_unlock (lock); | |
} | |
/* Stub to dlopen libcidn.so and invoke the real idna_to_ascii_lz, or | |
return IDNA_DLOPEN_ERROR on failure. */ | |
int | |
__idna_to_unicode_lzlz (const char *input, char **output, int flags) | |
{ | |
/* If the input string contains no "xn--" prefix for a component of | |
the name we can pass it up right away. */ | |
const char *cp = input; | |
while (*cp != '\0') | |
{ | |
if (strncmp (cp, IDNA_ACE_PREFIX, strlen (IDNA_ACE_PREFIX)) == 0) | |
break; | |
/* On to the next part of the name. */ | |
cp = __strchrnul (cp, '.'); | |
if (*cp == '.') | |
++cp; | |
} | |
if (*cp == '\0') | |
{ | |
*output = (char *) input; | |
return IDNA_SUCCESS; | |
} | |
if (h == NULL) | |
load_dso (); | |
if (h == (void *) 1l) | |
return IDNA_DLOPEN_ERROR; | |
return to_unicode_lzlz (input, output, flags); | |
} | |
/* Stub to dlopen libcidn.so and invoke the real idna_to_ascii_lz, or | |
return IDNA_DLOPEN_ERROR on failure. */ | |
int | |
__idna_to_ascii_lz (const char *input, char **output, int flags) | |
{ | |
/* If the input string contains no non-ASCII character the output | |
string will be the same. No valid locale encoding does not have | |
this property. */ | |
const char *cp = input; | |
while (*cp != '\0' && isascii (*cp)) | |
++cp; | |
if (*cp == '\0') | |
{ | |
*output = (char *) input; | |
return IDNA_SUCCESS; | |
} | |
if (h == NULL) | |
load_dso (); | |
if (h == (void *) 1l) | |
return IDNA_DLOPEN_ERROR; | |
return to_ascii_lz (input, output, flags); | |
} | |
#if IS_IN (libc) | |
libc_freeres_fn (unload_libidn) | |
{ | |
if (h != NULL && h != (void *) 1l) | |
{ | |
__libc_dlclose (h); | |
h = (void *) 1l; | |
} | |
} | |
#endif |