include/curl/typecheck-gcc.h

   1 #ifndef __CURL_TYPECHECK_GCC_H
   2 #define __CURL_TYPECHECK_GCC_H
   3 /***************************************************************************
   4  *                                  _   _ ____  _
   5  *  Project                     ___| | | |  _ \| |
   6  *                             / __| | | | |_) | |
   7  *                            | (__| |_| |  _ <| |___
   8  *                             \___|\___/|_| \_\_____|
   9  *
  10  * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
  11  *
  12  * This software is licensed as described in the file COPYING, which
  13  * you should have received as part of this distribution. The terms
  14  * are also available at http://curl.haxx.se/docs/copyright.html.
  15  *
  16  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  17  * copies of the Software, and permit persons to whom the Software is
  18  * furnished to do so, under the terms of the COPYING file.
  19  *
  20  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  21  * KIND, either express or implied.
  22  *
  23  ***************************************************************************/
  24
  25 /* wraps curl_easy_setopt() with typechecking */
  26
  27 /* To add a new kind of warning, add an
  28  *   if(_curl_is_sometype_option(_curl_opt))
  29  *     if(!_curl_is_sometype(value))
  30  *       _curl_easy_setopt_err_sometype();
  31  * block and define _curl_is_sometype_option, _curl_is_sometype and
  32  * _curl_easy_setopt_err_sometype below
  33  *
  34  * NOTE: We use two nested 'if' statements here instead of the && operator, in
  35  *       order to work around gcc bug #32061.  It affects only gcc 4.3.x/4.4.x
  36  *       when compiling with -Wlogical-op.
  37  *
  38  * To add an option that uses the same type as an existing option, you'll just
  39  * need to extend the appropriate _curl_*_option macro
  40  */
  41 #define curl_easy_setopt(handle, option, value)                               \
  42 __extension__ ({                                                              \
  43   __typeof__ (option) _curl_opt = option;                                     \
  44   if (__builtin_constant_p(_curl_opt)) {                                      \
  45     if (_curl_is_long_option(_curl_opt))                                      \
  46       if (!_curl_is_long(value))                                              \
  47         _curl_easy_setopt_err_long();                                         \
  48     if (_curl_is_off_t_option(_curl_opt))                                     \
  49       if (!_curl_is_off_t(value))                                             \
  50         _curl_easy_setopt_err_curl_off_t();                                   \
  51     if (_curl_is_string_option(_curl_opt))                                    \
  52       if (!_curl_is_string(value))                                            \
  53         _curl_easy_setopt_err_string();                                       \
  54     if (_curl_is_write_cb_option(_curl_opt))                                  \
  55       if (!_curl_is_write_cb(value))                                          \
  56         _curl_easy_setopt_err_write_callback();                               \
  57     if ((_curl_opt) == CURLOPT_READFUNCTION)                                  \
  58       if (!_curl_is_read_cb(value))                                           \
  59         _curl_easy_setopt_err_read_cb();                                      \
  60     if ((_curl_opt) == CURLOPT_IOCTLFUNCTION)                                 \
  61       if (!_curl_is_ioctl_cb(value))                                          \
  62         _curl_easy_setopt_err_ioctl_cb();                                     \
  63     if ((_curl_opt) == CURLOPT_SOCKOPTFUNCTION)                               \
  64       if (!_curl_is_sockopt_cb(value))                                        \
  65         _curl_easy_setopt_err_sockopt_cb();                                   \
  66     if ((_curl_opt) == CURLOPT_OPENSOCKETFUNCTION)                            \
  67       if (!_curl_is_opensocket_cb(value))                                     \
  68         _curl_easy_setopt_err_opensocket_cb();                                \
  69     if ((_curl_opt) == CURLOPT_PROGRESSFUNCTION)                              \
  70       if (!_curl_is_progress_cb(value))                                       \
  71         _curl_easy_setopt_err_progress_cb();                                  \
  72     if ((_curl_opt) == CURLOPT_DEBUGFUNCTION)                                 \
  73       if (!_curl_is_debug_cb(value))                                          \
  74         _curl_easy_setopt_err_debug_cb();                                     \
  75     if ((_curl_opt) == CURLOPT_SSL_CTX_FUNCTION)                              \
  76       if (!_curl_is_ssl_ctx_cb(value))                                        \
  77         _curl_easy_setopt_err_ssl_ctx_cb();                                   \
  78     if (_curl_is_conv_cb_option(_curl_opt))                                   \
  79       if (!_curl_is_conv_cb(value))                                           \
  80         _curl_easy_setopt_err_conv_cb();                                      \
  81     if ((_curl_opt) == CURLOPT_SEEKFUNCTION)                                  \
  82       if (!_curl_is_seek_cb(value))                                           \
  83         _curl_easy_setopt_err_seek_cb();                                      \
  84     if (_curl_is_cb_data_option(_curl_opt))                                   \
  85       if (!_curl_is_cb_data(value))                                           \
  86         _curl_easy_setopt_err_cb_data();                                      \
  87     if ((_curl_opt) == CURLOPT_ERRORBUFFER)                                   \
  88       if (!_curl_is_error_buffer(value))                                      \
  89         _curl_easy_setopt_err_error_buffer();                                 \
  90     if ((_curl_opt) == CURLOPT_STDERR)                                        \
  91       if (!_curl_is_FILE(value))                                              \
  92         _curl_easy_setopt_err_FILE();                                         \
  93     if (_curl_is_postfields_option(_curl_opt))                                \
  94       if (!_curl_is_postfields(value))                                        \
  95         _curl_easy_setopt_err_postfields();                                   \
  96     if ((_curl_opt) == CURLOPT_HTTPPOST)                                      \
  97       if (!_curl_is_arr((value), struct curl_httppost))                       \
  98         _curl_easy_setopt_err_curl_httpost();                                 \
  99     if (_curl_is_slist_option(_curl_opt))                                     \
 100       if (!_curl_is_arr((value), struct curl_slist))                          \
 101         _curl_easy_setopt_err_curl_slist();                                   \
 102     if ((_curl_opt) == CURLOPT_SHARE)                                         \
 103       if (!_curl_is_ptr((value), CURLSH))                                     \
 104         _curl_easy_setopt_err_CURLSH();                                       \
 105   }                                                                           \
 106   curl_easy_setopt(handle, _curl_opt, value);                                 \
 107 })
 108
 109 /* wraps curl_easy_getinfo() with typechecking */
 110 /* FIXME: don't allow const pointers */
 111 #define curl_easy_getinfo(handle, info, arg)                                  \
 112 __extension__ ({                                                              \
 113   __typeof__ (info) _curl_info = info;                                        \
 114   if (__builtin_constant_p(_curl_info)) {                                     \
 115     if (_curl_is_string_info(_curl_info))                                     \
 116       if (!_curl_is_arr((arg), char *))                                       \
 117         _curl_easy_getinfo_err_string();                                      \
 118     if (_curl_is_long_info(_curl_info))                                       \
 119       if (!_curl_is_arr((arg), long))                                         \
 120         _curl_easy_getinfo_err_long();                                        \
 121     if (_curl_is_double_info(_curl_info))                                     \
 122       if (!_curl_is_arr((arg), double))                                       \
 123         _curl_easy_getinfo_err_double();                                      \
 124     if (_curl_is_slist_info(_curl_info))                                      \
 125       if (!_curl_is_arr((arg), struct curl_slist *))                          \
 126         _curl_easy_getinfo_err_curl_slist();                                  \
 127   }                                                                           \
 128   curl_easy_getinfo(handle, _curl_info, arg);                                 \
 129 })
 130
 131 /* TODO: typechecking for curl_share_setopt() and curl_multi_setopt(),
 132  * for now just make sure that the functions are called with three
 133  * arguments
 134  */
 135 #define curl_share_setopt(share,opt,param) curl_share_setopt(share,opt,param)
 136 #define curl_multi_setopt(handle,opt,param) curl_multi_setopt(handle,opt,param)
 137
 138
 139 /* the actual warnings, triggered by calling the _curl_easy_setopt_err*
 140  * functions */
 141
 142 /* To define a new warning, use _CURL_WARNING(identifier, "message") */
 143 #define _CURL_WARNING(id, message)                                            \
 144   static void __attribute__((warning(message))) __attribute__((unused))       \
 145   __attribute__((noinline)) id(void) { __asm__(""); }
 146
 147 _CURL_WARNING(_curl_easy_setopt_err_long,
 148   "curl_easy_setopt expects a long argument for this option")
 149 _CURL_WARNING(_curl_easy_setopt_err_curl_off_t,
 150   "curl_easy_setopt expects a curl_off_t argument for this option")
 151 _CURL_WARNING(_curl_easy_setopt_err_string,
 152   "curl_easy_setopt expects a string (char* or char[]) argument for this option"
 153   )
 154 _CURL_WARNING(_curl_easy_setopt_err_write_callback,
 155   "curl_easy_setopt expects a curl_write_callback argument for this option")
 156 _CURL_WARNING(_curl_easy_setopt_err_read_cb,
 157   "curl_easy_setopt expects a curl_read_callback argument for this option")
 158 _CURL_WARNING(_curl_easy_setopt_err_ioctl_cb,
 159   "curl_easy_setopt expects a curl_ioctl_callback argument for this option")
 160 _CURL_WARNING(_curl_easy_setopt_err_sockopt_cb,
 161   "curl_easy_setopt expects a curl_sockopt_callback argument for this option")
 162 _CURL_WARNING(_curl_easy_setopt_err_opensocket_cb,
 163   "curl_easy_setopt expects a curl_opensocket_callback argument for this option"
 164   )
 165 _CURL_WARNING(_curl_easy_setopt_err_progress_cb,
 166   "curl_easy_setopt expects a curl_progress_callback argument for this option")
 167 _CURL_WARNING(_curl_easy_setopt_err_debug_cb,
 168   "curl_easy_setopt expects a curl_debug_callback argument for this option")
 169 _CURL_WARNING(_curl_easy_setopt_err_ssl_ctx_cb,
 170   "curl_easy_setopt expects a curl_ssl_ctx_callback argument for this option")
 171 _CURL_WARNING(_curl_easy_setopt_err_conv_cb,
 172   "curl_easy_setopt expects a curl_conv_callback argument for this option")
 173 _CURL_WARNING(_curl_easy_setopt_err_seek_cb,
 174   "curl_easy_setopt expects a curl_seek_callback argument for this option")
 175 _CURL_WARNING(_curl_easy_setopt_err_cb_data,
 176   "curl_easy_setopt expects a private data pointer as argument for this option")
 177 _CURL_WARNING(_curl_easy_setopt_err_error_buffer,
 178   "curl_easy_setopt expects a char buffer of CURL_ERROR_SIZE as argument for this option")
 179 _CURL_WARNING(_curl_easy_setopt_err_FILE,
 180   "curl_easy_setopt expects a FILE* argument for this option")
 181 _CURL_WARNING(_curl_easy_setopt_err_postfields,
 182   "curl_easy_setopt expects a void* or char* argument for this option")
 183 _CURL_WARNING(_curl_easy_setopt_err_curl_httpost,
 184   "curl_easy_setopt expects a struct curl_httppost* argument for this option")
 185 _CURL_WARNING(_curl_easy_setopt_err_curl_slist,
 186   "curl_easy_setopt expects a struct curl_slist* argument for this option")
 187 _CURL_WARNING(_curl_easy_setopt_err_CURLSH,
 188   "curl_easy_setopt expects a CURLSH* argument for this option")
 189
 190 _CURL_WARNING(_curl_easy_getinfo_err_string,
 191   "curl_easy_getinfo expects a pointer to char * for this info")
 192 _CURL_WARNING(_curl_easy_getinfo_err_long,
 193   "curl_easy_getinfo expects a pointer to long for this info")
 194 _CURL_WARNING(_curl_easy_getinfo_err_double,
 195   "curl_easy_getinfo expects a pointer to double for this info")
 196 _CURL_WARNING(_curl_easy_getinfo_err_curl_slist,
 197   "curl_easy_getinfo expects a pointer to struct curl_slist * for this info")
 198
 199 /* groups of curl_easy_setops options that take the same type of argument */
 200
 201 /* To add a new option to one of the groups, just add
 202  *   (option) == CURLOPT_SOMETHING
 203  * to the or-expression. If the option takes a long or curl_off_t, you don't
 204  * have to do anything
 205  */
 206
 207 /* evaluates to true if option takes a long argument */
 208 #define _curl_is_long_option(option)                                          \
 209   (0 < (option) && (option) < CURLOPTTYPE_OBJECTPOINT)
 210
 211 #define _curl_is_off_t_option(option)                                         \
 212   ((option) > CURLOPTTYPE_OFF_T)
 213
 214 /* evaluates to true if option takes a char* argument */
 215 #define _curl_is_string_option(option)                                        \
 216   ((option) == CURLOPT_URL ||                                                 \
 217    (option) == CURLOPT_PROXY ||                                               \
 218    (option) == CURLOPT_INTERFACE ||                                           \
 219    (option) == CURLOPT_NETRC_FILE ||                                          \
 220    (option) == CURLOPT_USERPWD ||                                             \
 221    (option) == CURLOPT_USERNAME ||                                            \
 222    (option) == CURLOPT_PASSWORD ||                                            \
 223    (option) == CURLOPT_PROXYUSERPWD ||                                        \
 224    (option) == CURLOPT_PROXYUSERNAME ||                                       \
 225    (option) == CURLOPT_PROXYPASSWORD ||                                       \
 226    (option) == CURLOPT_NOPROXY ||                                             \
 227    (option) == CURLOPT_ENCODING ||                                            \
 228    (option) == CURLOPT_REFERER ||                                             \
 229    (option) == CURLOPT_USERAGENT ||                                           \
 230    (option) == CURLOPT_COOKIE ||                                              \
 231    (option) == CURLOPT_COOKIEFILE ||                                          \
 232    (option) == CURLOPT_COOKIEJAR ||                                           \
 233    (option) == CURLOPT_COOKIELIST ||                                          \
 234    (option) == CURLOPT_FTPPORT ||                                             \
 235    (option) == CURLOPT_FTP_ALTERNATIVE_TO_USER ||                             \
 236    (option) == CURLOPT_FTP_ACCOUNT ||                                         \
 237    (option) == CURLOPT_RANGE ||                                               \
 238    (option) == CURLOPT_CUSTOMREQUEST ||                                       \
 239    (option) == CURLOPT_SSLCERT ||                                             \
 240    (option) == CURLOPT_SSLCERTTYPE ||                                         \
 241    (option) == CURLOPT_SSLKEY ||                                              \
 242    (option) == CURLOPT_SSLKEYTYPE ||                                          \
 243    (option) == CURLOPT_KEYPASSWD ||                                           \
 244    (option) == CURLOPT_SSLENGINE ||                                           \
 245    (option) == CURLOPT_CAINFO ||                                              \
 246    (option) == CURLOPT_CAPATH ||                                              \
 247    (option) == CURLOPT_RANDOM_FILE ||                                         \
 248    (option) == CURLOPT_EGDSOCKET ||                                           \
 249    (option) == CURLOPT_SSL_CIPHER_LIST ||                                     \
 250    (option) == CURLOPT_KRBLEVEL ||                                            \
 251    (option) == CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 ||                             \
 252    (option) == CURLOPT_SSH_PUBLIC_KEYFILE ||                                  \
 253    (option) == CURLOPT_SSH_PRIVATE_KEYFILE ||                                 \
 254    (option) == CURLOPT_CRLFILE ||                                             \
 255    (option) == CURLOPT_ISSUERCERT ||                                          \
 256    (option) == CURLOPT_SOCKS5_GSSAPI_SERVICE ||                               \
 257    (option) == CURLOPT_SSH_KNOWNHOSTS ||                                      \
 258    (option) == CURLOPT_MAIL_FROM ||                                           \
 259    (option) == CURLOPT_RTSP_SESSION_ID ||                                     \
 260    (option) == CURLOPT_RTSP_STREAM_URI ||                                     \
 261    (option) == CURLOPT_RTSP_TRANSPORT ||                                      \
 262    0)
 263
 264 /* evaluates to true if option takes a curl_write_callback argument */
 265 #define _curl_is_write_cb_option(option)                                      \
 266   ((option) == CURLOPT_HEADERFUNCTION ||                                      \
 267    (option) == CURLOPT_WRITEFUNCTION)
 268
 269 /* evaluates to true if option takes a curl_conv_callback argument */
 270 #define _curl_is_conv_cb_option(option)                                       \
 271   ((option) == CURLOPT_CONV_TO_NETWORK_FUNCTION ||                            \
 272    (option) == CURLOPT_CONV_FROM_NETWORK_FUNCTION ||                          \
 273    (option) == CURLOPT_CONV_FROM_UTF8_FUNCTION)
 274
 275 /* evaluates to true if option takes a data argument to pass to a callback */
 276 #define _curl_is_cb_data_option(option)                                       \
 277   ((option) == CURLOPT_WRITEDATA ||                                           \
 278    (option) == CURLOPT_READDATA ||                                            \
 279    (option) == CURLOPT_IOCTLDATA ||                                           \
 280    (option) == CURLOPT_SOCKOPTDATA ||                                         \
 281    (option) == CURLOPT_OPENSOCKETDATA ||                                      \
 282    (option) == CURLOPT_PROGRESSDATA ||                                        \
 283    (option) == CURLOPT_WRITEHEADER ||                                         \
 284    (option) == CURLOPT_DEBUGDATA ||                                           \
 285    (option) == CURLOPT_SSL_CTX_DATA ||                                        \
 286    (option) == CURLOPT_SEEKDATA ||                                            \
 287    (option) == CURLOPT_PRIVATE ||                                             \
 288    (option) == CURLOPT_SSH_KEYDATA ||                                         \
 289    (option) == CURLOPT_INTERLEAVEDATA ||                                      \
 290    (option) == CURLOPT_CHUNK_DATA ||                                          \
 291    (option) == CURLOPT_FNMATCH_DATA ||                                        \
 292    0)
 293
 294 /* evaluates to true if option takes a POST data argument (void* or char*) */
 295 #define _curl_is_postfields_option(option)                                    \
 296   ((option) == CURLOPT_POSTFIELDS ||                                          \
 297    (option) == CURLOPT_COPYPOSTFIELDS ||                                      \
 298    0)
 299
 300 /* evaluates to true if option takes a struct curl_slist * argument */
 301 #define _curl_is_slist_option(option)                                         \
 302   ((option) == CURLOPT_HTTPHEADER ||                                          \
 303    (option) == CURLOPT_HTTP200ALIASES ||                                      \
 304    (option) == CURLOPT_QUOTE ||                                               \
 305    (option) == CURLOPT_POSTQUOTE ||                                           \
 306    (option) == CURLOPT_PREQUOTE ||                                            \
 307    (option) == CURLOPT_TELNETOPTIONS ||                                       \
 308    (option) == CURLOPT_MAIL_RCPT ||                                           \
 309    0)
 310
 311 /* groups of curl_easy_getinfo infos that take the same type of argument */
 312
 313 /* evaluates to true if info expects a pointer to char * argument */
 314 #define _curl_is_string_info(info)                                            \
 315   (CURLINFO_STRING < (info) && (info) < CURLINFO_LONG)
 316
 317 /* evaluates to true if info expects a pointer to long argument */
 318 #define _curl_is_long_info(info)                                              \
 319   (CURLINFO_LONG < (info) && (info) < CURLINFO_DOUBLE)
 320
 321 /* evaluates to true if info expects a pointer to double argument */
 322 #define _curl_is_double_info(info)                                            \
 323   (CURLINFO_DOUBLE < (info) && (info) < CURLINFO_SLIST)
 324
 325 /* true if info expects a pointer to struct curl_slist * argument */
 326 #define _curl_is_slist_info(info)                                             \
 327   (CURLINFO_SLIST < (info))
 328
 329
 330 /* typecheck helpers -- check whether given expression has requested type*/
 331
 332 /* For pointers, you can use the _curl_is_ptr/_curl_is_arr macros,
 333  * otherwise define a new macro. Search for __builtin_types_compatible_p
 334  * in the GCC manual.
 335  * NOTE: these macros MUST NOT EVALUATE their arguments! The argument is
 336  * the actual expression passed to the curl_easy_setopt macro. This
 337  * means that you can only apply the sizeof and __typeof__ operators, no
 338  * == or whatsoever.
 339  */
 340
 341 /* XXX: should evaluate to true iff expr is a pointer */
 342 #define _curl_is_any_ptr(expr)                                                \
 343   (sizeof(expr) == sizeof(void*))
 344
 345 /* evaluates to true if expr is NULL */
 346 /* XXX: must not evaluate expr, so this check is not accurate */
 347 #define _curl_is_NULL(expr)                                                   \
 348   (__builtin_types_compatible_p(__typeof__(expr), __typeof__(NULL)))
 349
 350 /* evaluates to true if expr is type*, const type* or NULL */
 351 #define _curl_is_ptr(expr, type)                                              \
 352   (_curl_is_NULL(expr) ||                                                     \
 353    __builtin_types_compatible_p(__typeof__(expr), type *) ||                  \
 354    __builtin_types_compatible_p(__typeof__(expr), const type *))
 355
 356 /* evaluates to true if expr is one of type[], type*, NULL or const type* */
 357 #define _curl_is_arr(expr, type)                                              \
 358   (_curl_is_ptr((expr), type) ||                                              \
 359    __builtin_types_compatible_p(__typeof__(expr), type []))
 360
 361 /* evaluates to true if expr is a string */
 362 #define _curl_is_string(expr)                                                 \
 363   (_curl_is_arr((expr), char) ||                                              \
 364    _curl_is_arr((expr), signed char) ||                                       \
 365    _curl_is_arr((expr), unsigned char))
 366
 367 /* evaluates to true if expr is a long (no matter the signedness)
 368  * XXX: for now, int is also accepted (and therefore short and char, which
 369  * are promoted to int when passed to a variadic function) */
 370 #define _curl_is_long(expr)                                                   \
 371   (__builtin_types_compatible_p(__typeof__(expr), long) ||                    \
 372    __builtin_types_compatible_p(__typeof__(expr), signed long) ||             \
 373    __builtin_types_compatible_p(__typeof__(expr), unsigned long) ||           \
 374    __builtin_types_compatible_p(__typeof__(expr), int) ||                     \
 375    __builtin_types_compatible_p(__typeof__(expr), signed int) ||              \
 376    __builtin_types_compatible_p(__typeof__(expr), unsigned int) ||            \
 377    __builtin_types_compatible_p(__typeof__(expr), short) ||                   \
 378    __builtin_types_compatible_p(__typeof__(expr), signed short) ||            \
 379    __builtin_types_compatible_p(__typeof__(expr), unsigned short) ||          \
 380    __builtin_types_compatible_p(__typeof__(expr), char) ||                    \
 381    __builtin_types_compatible_p(__typeof__(expr), signed char) ||             \
 382    __builtin_types_compatible_p(__typeof__(expr), unsigned char))
 383
 384 /* evaluates to true if expr is of type curl_off_t */
 385 #define _curl_is_off_t(expr)                                                  \
 386   (__builtin_types_compatible_p(__typeof__(expr), curl_off_t))
 387
 388 /* evaluates to true if expr is abuffer suitable for CURLOPT_ERRORBUFFER */
 389 /* XXX: also check size of an char[] array? */
 390 #define _curl_is_error_buffer(expr)                                           \
 391   (__builtin_types_compatible_p(__typeof__(expr), char *) ||                  \
 392    __builtin_types_compatible_p(__typeof__(expr), char[]))
 393
 394 /* evaluates to true if expr is of type (const) void* or (const) FILE* */
 395 #if 0
 396 #define _curl_is_cb_data(expr)                                                \
 397   (_curl_is_ptr((expr), void) ||                                              \
 398    _curl_is_ptr((expr), FILE))
 399 #else /* be less strict */
 400 #define _curl_is_cb_data(expr)                                                \
 401   _curl_is_any_ptr(expr)
 402 #endif
 403
 404 /* evaluates to true if expr is of type FILE* */
 405 #define _curl_is_FILE(expr)                                                   \
 406   (__builtin_types_compatible_p(__typeof__(expr), FILE *))
 407
 408 /* evaluates to true if expr can be passed as POST data (void* or char*) */
 409 #define _curl_is_postfields(expr)                                             \
 410   (_curl_is_ptr((expr), void) ||                                              \
 411    _curl_is_arr((expr), char))
 412
 413 /* FIXME: the whole callback checking is messy...
 414  * The idea is to tolerate char vs. void and const vs. not const
 415  * pointers in arguments at least
 416  */
 417 /* helper: __builtin_types_compatible_p distinguishes between functions and
 418  * function pointers, hide it */
 419 #define _curl_callback_compatible(func, type)                                 \
 420   (__builtin_types_compatible_p(__typeof__(func), type) ||                    \
 421    __builtin_types_compatible_p(__typeof__(func), type*))
 422
 423 /* evaluates to true if expr is of type curl_read_callback or "similar" */
 424 #define _curl_is_read_cb(expr)                                          \
 425   (_curl_is_NULL(expr) ||                                                     \
 426    __builtin_types_compatible_p(__typeof__(expr), __typeof__(fread)) ||       \
 427    __builtin_types_compatible_p(__typeof__(expr), curl_read_callback) ||      \
 428    _curl_callback_compatible((expr), _curl_read_callback1) ||                 \
 429    _curl_callback_compatible((expr), _curl_read_callback2) ||                 \
 430    _curl_callback_compatible((expr), _curl_read_callback3) ||                 \
 431    _curl_callback_compatible((expr), _curl_read_callback4) ||                 \
 432    _curl_callback_compatible((expr), _curl_read_callback5) ||                 \
 433    _curl_callback_compatible((expr), _curl_read_callback6))
 434 typedef size_t (_curl_read_callback1)(char *, size_t, size_t, void*);
 435 typedef size_t (_curl_read_callback2)(char *, size_t, size_t, const void*);
 436 typedef size_t (_curl_read_callback3)(char *, size_t, size_t, FILE*);
 437 typedef size_t (_curl_read_callback4)(void *, size_t, size_t, void*);
 438 typedef size_t (_curl_read_callback5)(void *, size_t, size_t, const void*);
 439 typedef size_t (_curl_read_callback6)(void *, size_t, size_t, FILE*);
 440
 441 /* evaluates to true if expr is of type curl_write_callback or "similar" */
 442 #define _curl_is_write_cb(expr)                                               \
 443   (_curl_is_read_cb(expr) ||                                            \
 444    __builtin_types_compatible_p(__typeof__(expr), __typeof__(fwrite)) ||      \
 445    __builtin_types_compatible_p(__typeof__(expr), curl_write_callback) ||     \
 446    _curl_callback_compatible((expr), _curl_write_callback1) ||                \
 447    _curl_callback_compatible((expr), _curl_write_callback2) ||                \
 448    _curl_callback_compatible((expr), _curl_write_callback3) ||                \
 449    _curl_callback_compatible((expr), _curl_write_callback4) ||                \
 450    _curl_callback_compatible((expr), _curl_write_callback5) ||                \
 451    _curl_callback_compatible((expr), _curl_write_callback6))
 452 typedef size_t (_curl_write_callback1)(const char *, size_t, size_t, void*);
 453 typedef size_t (_curl_write_callback2)(const char *, size_t, size_t,
 454                                        const void*);
 455 typedef size_t (_curl_write_callback3)(const char *, size_t, size_t, FILE*);
 456 typedef size_t (_curl_write_callback4)(const void *, size_t, size_t, void*);
 457 typedef size_t (_curl_write_callback5)(const void *, size_t, size_t,
 458                                        const void*);
 459 typedef size_t (_curl_write_callback6)(const void *, size_t, size_t, FILE*);
 460
 461 /* evaluates to true if expr is of type curl_ioctl_callback or "similar" */
 462 #define _curl_is_ioctl_cb(expr)                                         \
 463   (_curl_is_NULL(expr) ||                                                     \
 464    __builtin_types_compatible_p(__typeof__(expr), curl_ioctl_callback) ||     \
 465    _curl_callback_compatible((expr), _curl_ioctl_callback1) ||                \
 466    _curl_callback_compatible((expr), _curl_ioctl_callback2) ||                \
 467    _curl_callback_compatible((expr), _curl_ioctl_callback3) ||                \
 468    _curl_callback_compatible((expr), _curl_ioctl_callback4))
 469 typedef curlioerr (_curl_ioctl_callback1)(CURL *, int, void*);
 470 typedef curlioerr (_curl_ioctl_callback2)(CURL *, int, const void*);
 471 typedef curlioerr (_curl_ioctl_callback3)(CURL *, curliocmd, void*);
 472 typedef curlioerr (_curl_ioctl_callback4)(CURL *, curliocmd, const void*);
 473
 474 /* evaluates to true if expr is of type curl_sockopt_callback or "similar" */
 475 #define _curl_is_sockopt_cb(expr)                                       \
 476   (_curl_is_NULL(expr) ||                                                     \
 477    __builtin_types_compatible_p(__typeof__(expr), curl_sockopt_callback) ||   \
 478    _curl_callback_compatible((expr), _curl_sockopt_callback1) ||              \
 479    _curl_callback_compatible((expr), _curl_sockopt_callback2))
 480 typedef int (_curl_sockopt_callback1)(void *, curl_socket_t, curlsocktype);
 481 typedef int (_curl_sockopt_callback2)(const void *, curl_socket_t,
 482                                       curlsocktype);
 483
 484 /* evaluates to true if expr is of type curl_opensocket_callback or "similar" */
 485 #define _curl_is_opensocket_cb(expr)                                    \
 486   (_curl_is_NULL(expr) ||                                                     \
 487    __builtin_types_compatible_p(__typeof__(expr), curl_opensocket_callback) ||\
 488    _curl_callback_compatible((expr), _curl_opensocket_callback1) ||           \
 489    _curl_callback_compatible((expr), _curl_opensocket_callback2) ||           \
 490    _curl_callback_compatible((expr), _curl_opensocket_callback3) ||           \
 491    _curl_callback_compatible((expr), _curl_opensocket_callback4))
 492 typedef curl_socket_t (_curl_opensocket_callback1)
 493   (void *, curlsocktype, struct curl_sockaddr *);
 494 typedef curl_socket_t (_curl_opensocket_callback2)
 495   (void *, curlsocktype, const struct curl_sockaddr *);
 496 typedef curl_socket_t (_curl_opensocket_callback3)
 497   (const void *, curlsocktype, struct curl_sockaddr *);
 498 typedef curl_socket_t (_curl_opensocket_callback4)
 499   (const void *, curlsocktype, const struct curl_sockaddr *);
 500
 501 /* evaluates to true if expr is of type curl_progress_callback or "similar" */
 502 #define _curl_is_progress_cb(expr)                                      \
 503   (_curl_is_NULL(expr) ||                                                     \
 504    __builtin_types_compatible_p(__typeof__(expr), curl_progress_callback) ||  \
 505    _curl_callback_compatible((expr), _curl_progress_callback1) ||             \
 506    _curl_callback_compatible((expr), _curl_progress_callback2))
 507 typedef int (_curl_progress_callback1)(void *,
 508     double, double, double, double);
 509 typedef int (_curl_progress_callback2)(const void *,
 510     double, double, double, double);
 511
 512 /* evaluates to true if expr is of type curl_debug_callback or "similar" */
 513 #define _curl_is_debug_cb(expr)                                         \
 514   (_curl_is_NULL(expr) ||                                                     \
 515    __builtin_types_compatible_p(__typeof__(expr), curl_debug_callback) ||     \
 516    _curl_callback_compatible((expr), _curl_debug_callback1) ||                \
 517    _curl_callback_compatible((expr), _curl_debug_callback2) ||                \
 518    _curl_callback_compatible((expr), _curl_debug_callback3) ||                \
 519    _curl_callback_compatible((expr), _curl_debug_callback4))
 520 typedef int (_curl_debug_callback1) (CURL *,
 521     curl_infotype, char *, size_t, void *);
 522 typedef int (_curl_debug_callback2) (CURL *,
 523     curl_infotype, char *, size_t, const void *);
 524 typedef int (_curl_debug_callback3) (CURL *,
 525     curl_infotype, const char *, size_t, void *);
 526 typedef int (_curl_debug_callback4) (CURL *,
 527     curl_infotype, const char *, size_t, const void *);
 528
 529 /* evaluates to true if expr is of type curl_ssl_ctx_callback or "similar" */
 530 /* this is getting even messier... */
 531 #define _curl_is_ssl_ctx_cb(expr)                                       \
 532   (_curl_is_NULL(expr) ||                                                     \
 533    __builtin_types_compatible_p(__typeof__(expr), curl_ssl_ctx_callback) ||   \
 534    _curl_callback_compatible((expr), _curl_ssl_ctx_callback1) ||              \
 535    _curl_callback_compatible((expr), _curl_ssl_ctx_callback2) ||              \
 536    _curl_callback_compatible((expr), _curl_ssl_ctx_callback3) ||              \
 537    _curl_callback_compatible((expr), _curl_ssl_ctx_callback4) ||              \
 538    _curl_callback_compatible((expr), _curl_ssl_ctx_callback5) ||              \
 539    _curl_callback_compatible((expr), _curl_ssl_ctx_callback6) ||              \
 540    _curl_callback_compatible((expr), _curl_ssl_ctx_callback7) ||              \
 541    _curl_callback_compatible((expr), _curl_ssl_ctx_callback8))
 542 typedef CURLcode (_curl_ssl_ctx_callback1)(CURL *, void *, void *);
 543 typedef CURLcode (_curl_ssl_ctx_callback2)(CURL *, void *, const void *);
 544 typedef CURLcode (_curl_ssl_ctx_callback3)(CURL *, const void *, void *);
 545 typedef CURLcode (_curl_ssl_ctx_callback4)(CURL *, const void *, const void *);
 546 #ifdef HEADER_SSL_H
 547 /* hack: if we included OpenSSL's ssl.h, we know about SSL_CTX
 548  * this will of course break if we're included before OpenSSL headers...
 549  */
 550 typedef CURLcode (_curl_ssl_ctx_callback5)(CURL *, SSL_CTX, void *);
 551 typedef CURLcode (_curl_ssl_ctx_callback6)(CURL *, SSL_CTX, const void *);
 552 typedef CURLcode (_curl_ssl_ctx_callback7)(CURL *, const SSL_CTX, void *);
 553 typedef CURLcode (_curl_ssl_ctx_callback8)(CURL *, const SSL_CTX, const void *);
 554 #else
 555 typedef _curl_ssl_ctx_callback1 _curl_ssl_ctx_callback5;
 556 typedef _curl_ssl_ctx_callback1 _curl_ssl_ctx_callback6;
 557 typedef _curl_ssl_ctx_callback1 _curl_ssl_ctx_callback7;
 558 typedef _curl_ssl_ctx_callback1 _curl_ssl_ctx_callback8;
 559 #endif
 560
 561 /* evaluates to true if expr is of type curl_conv_callback or "similar" */
 562 #define _curl_is_conv_cb(expr)                                          \
 563   (_curl_is_NULL(expr) ||                                                     \
 564    __builtin_types_compatible_p(__typeof__(expr), curl_conv_callback) ||      \
 565    _curl_callback_compatible((expr), _curl_conv_callback1) ||                 \
 566    _curl_callback_compatible((expr), _curl_conv_callback2) ||                 \
 567    _curl_callback_compatible((expr), _curl_conv_callback3) ||                 \
 568    _curl_callback_compatible((expr), _curl_conv_callback4))
 569 typedef CURLcode (*_curl_conv_callback1)(char *, size_t length);
 570 typedef CURLcode (*_curl_conv_callback2)(const char *, size_t length);
 571 typedef CURLcode (*_curl_conv_callback3)(void *, size_t length);
 572 typedef CURLcode (*_curl_conv_callback4)(const void *, size_t length);
 573
 574 /* evaluates to true if expr is of type curl_seek_callback or "similar" */
 575 #define _curl_is_seek_cb(expr)                                          \
 576   (_curl_is_NULL(expr) ||                                                     \
 577    __builtin_types_compatible_p(__typeof__(expr), curl_seek_callback) ||      \
 578    _curl_callback_compatible((expr), _curl_seek_callback1) ||                 \
 579    _curl_callback_compatible((expr), _curl_seek_callback2))
 580 typedef CURLcode (*_curl_seek_callback1)(void *, curl_off_t, int);
 581 typedef CURLcode (*_curl_seek_callback2)(const void *, curl_off_t, int);
 582
 583
 584 #endif /* __CURL_TYPECHECK_GCC_H */