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