release/src/router/libiconv/srclib/error.c

   1 /* Error handler for noninteractive utilities
   2    Copyright (C) 1990-1998, 2000-2007, 2009-2011 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>.  */
  19
  20 #if !_LIBC
  21 # include <config.h>
  22 #endif
  23
  24 #include "error.h"
  25
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #if !_LIBC && ENABLE_NLS
  32 # include "gettext.h"
  33 # define _(msgid) gettext (msgid)
  34 #endif
  35
  36 #ifdef _LIBC
  37 # include <libintl.h>
  38 # include <stdbool.h>
  39 # include <stdint.h>
  40 # include <wchar.h>
  41 # define mbsrtowcs __mbsrtowcs
  42 #endif
  43
  44 #if USE_UNLOCKED_IO
  45 # include "unlocked-io.h"
  46 #endif
  47
  48 #ifndef _
  49 # define _(String) String
  50 #endif
  51
  52 /* If NULL, error will flush stdout, then print on stderr the program
  53    name, a colon and a space.  Otherwise, error will call this
  54    function without parameters instead.  */
  55 void (*error_print_progname) (void);
  56
  57 /* This variable is incremented each time `error' is called.  */
  58 unsigned int error_message_count;
  59
  60 #ifdef _LIBC
  61 /* In the GNU C library, there is a predefined variable for this.  */
  62
  63 # define program_name program_invocation_name
  64 # include <errno.h>
  65 # include <limits.h>
  66 # include <libio/libioP.h>
  67
  68 /* In GNU libc we want do not want to use the common name `error' directly.
  69    Instead make it a weak alias.  */
  70 extern void __error (int status, int errnum, const char *message, ...)
  71      __attribute__ ((__format__ (__printf__, 3, 4)));
  72 extern void __error_at_line (int status, int errnum, const char *file_name,
  73                              unsigned int line_number, const char *message,
  74                              ...)
  75      __attribute__ ((__format__ (__printf__, 5, 6)));;
  76 # define error __error
  77 # define error_at_line __error_at_line
  78
  79 # include <libio/iolibio.h>
  80 # define fflush(s) INTUSE(_IO_fflush) (s)
  81 # undef putc
  82 # define putc(c, fp) INTUSE(_IO_putc) (c, fp)
  83
  84 # include <bits/libc-lock.h>
  85
  86 #else /* not _LIBC */
  87
  88 # include <fcntl.h>
  89 # include <unistd.h>
  90
  91 # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
  92 /* Get declarations of the Win32 API functions.  */
  93 #  define WIN32_LEAN_AND_MEAN
  94 #  include <windows.h>
  95 # endif
  96
  97 /* The gnulib override of fcntl is not needed in this file.  */
  98 # undef fcntl
  99
 100 # if !HAVE_DECL_STRERROR_R
 101 #  ifndef HAVE_DECL_STRERROR_R
 102 "this configure-time declaration test was not run"
 103 #  endif
 104 #  if STRERROR_R_CHAR_P
 105 char *strerror_r ();
 106 #  else
 107 int strerror_r ();
 108 #  endif
 109 # endif
 110
 111 /* The calling program should define program_name and set it to the
 112    name of the executing program.  */
 113 extern char *program_name;
 114
 115 # if HAVE_STRERROR_R || defined strerror_r
 116 #  define __strerror_r strerror_r
 117 # endif /* HAVE_STRERROR_R || defined strerror_r */
 118 #endif  /* not _LIBC */
 119
 120 #if !_LIBC
 121 /* Return non-zero if FD is open.  */
 122 static inline int
 123 is_open (int fd)
 124 {
 125 # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
 126   /* On Win32: The initial state of unassigned standard file descriptors is
 127      that they are open but point to an INVALID_HANDLE_VALUE.  There is no
 128      fcntl, and the gnulib replacement fcntl does not support F_GETFL.  */
 129   return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
 130 # else
 131 #  ifndef F_GETFL
 132 #   error Please port fcntl to your platform
 133 #  endif
 134   return 0 <= fcntl (fd, F_GETFL);
 135 # endif
 136 }
 137 #endif
 138
 139 static inline void
 140 flush_stdout (void)
 141 {
 142 #if !_LIBC
 143   int stdout_fd;
 144
 145 # if GNULIB_FREOPEN_SAFER
 146   /* Use of gnulib's freopen-safer module normally ensures that
 147        fileno (stdout) == 1
 148      whenever stdout is open.  */
 149   stdout_fd = STDOUT_FILENO;
 150 # else
 151   /* POSIX states that fileno (stdout) after fclose is unspecified.  But in
 152      practice it is not a problem, because stdout is statically allocated and
 153      the fd of a FILE stream is stored as a field in its allocated memory.  */
 154   stdout_fd = fileno (stdout);
 155 # endif
 156   /* POSIX states that fflush (stdout) after fclose is unspecified; it
 157      is safe in glibc, but not on all other platforms.  fflush (NULL)
 158      is always defined, but too draconian.  */
 159   if (0 <= stdout_fd && is_open (stdout_fd))
 160 #endif
 161     fflush (stdout);
 162 }
 163
 164 static void
 165 print_errno_message (int errnum)
 166 {
 167   char const *s;
 168
 169 #if defined HAVE_STRERROR_R || _LIBC
 170   char errbuf[1024];
 171 # if STRERROR_R_CHAR_P || _LIBC
 172   s = __strerror_r (errnum, errbuf, sizeof errbuf);
 173 # else
 174   if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
 175     s = errbuf;
 176   else
 177     s = 0;
 178 # endif
 179 #else
 180   s = strerror (errnum);
 181 #endif
 182
 183 #if !_LIBC
 184   if (! s)
 185     s = _("Unknown system error");
 186 #endif
 187
 188 #if _LIBC
 189   __fxprintf (NULL, ": %s", s);
 190 #else
 191   fprintf (stderr, ": %s", s);
 192 #endif
 193 }
 194
 195 static void
 196 error_tail (int status, int errnum, const char *message, va_list args)
 197 {
 198 #if _LIBC
 199   if (_IO_fwide (stderr, 0) > 0)
 200     {
 201 # define ALLOCA_LIMIT 2000
 202       size_t len = strlen (message) + 1;
 203       wchar_t *wmessage = NULL;
 204       mbstate_t st;
 205       size_t res;
 206       const char *tmp;
 207       bool use_malloc = false;
 208
 209       while (1)
 210         {
 211           if (__libc_use_alloca (len * sizeof (wchar_t)))
 212             wmessage = (wchar_t *) alloca (len * sizeof (wchar_t));
 213           else
 214             {
 215               if (!use_malloc)
 216                 wmessage = NULL;
 217
 218               wchar_t *p = (wchar_t *) realloc (wmessage,
 219                                                 len * sizeof (wchar_t));
 220               if (p == NULL)
 221                 {
 222                   free (wmessage);
 223                   fputws_unlocked (L"out of memory\n", stderr);
 224                   return;
 225                 }
 226               wmessage = p;
 227               use_malloc = true;
 228             }
 229
 230           memset (&st, '\0', sizeof (st));
 231           tmp = message;
 232
 233           res = mbsrtowcs (wmessage, &tmp, len, &st);
 234           if (res != len)
 235             break;
 236
 237           if (__builtin_expect (len >= SIZE_MAX / 2, 0))
 238             {
 239               /* This really should not happen if everything is fine.  */
 240               res = (size_t) -1;
 241               break;
 242             }
 243
 244           len *= 2;
 245         }
 246
 247       if (res == (size_t) -1)
 248         {
 249           /* The string cannot be converted.  */
 250           if (use_malloc)
 251             {
 252               free (wmessage);
 253               use_malloc = false;
 254             }
 255           wmessage = (wchar_t *) L"???";
 256         }
 257
 258       __vfwprintf (stderr, wmessage, args);
 259
 260       if (use_malloc)
 261         free (wmessage);
 262     }
 263   else
 264 #endif
 265     vfprintf (stderr, message, args);
 266   va_end (args);
 267
 268   ++error_message_count;
 269   if (errnum)
 270     print_errno_message (errnum);
 271 #if _LIBC
 272   __fxprintf (NULL, "\n");
 273 #else
 274   putc ('\n', stderr);
 275 #endif
 276   fflush (stderr);
 277   if (status)
 278     exit (status);
 279 }
 280
 281
 282 /* Print the program name and error message MESSAGE, which is a printf-style
 283    format string with optional args.
 284    If ERRNUM is nonzero, print its corresponding system error message.
 285    Exit with status STATUS if it is nonzero.  */
 286 void
 287 error (int status, int errnum, const char *message, ...)
 288 {
 289   va_list args;
 290
 291 #if defined _LIBC && defined __libc_ptf_call
 292   /* We do not want this call to be cut short by a thread
 293      cancellation.  Therefore disable cancellation for now.  */
 294   int state = PTHREAD_CANCEL_ENABLE;
 295   __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
 296                    0);
 297 #endif
 298
 299   flush_stdout ();
 300 #ifdef _LIBC
 301   _IO_flockfile (stderr);
 302 #endif
 303   if (error_print_progname)
 304     (*error_print_progname) ();
 305   else
 306     {
 307 #if _LIBC
 308       __fxprintf (NULL, "%s: ", program_name);
 309 #else
 310       fprintf (stderr, "%s: ", program_name);
 311 #endif
 312     }
 313
 314   va_start (args, message);
 315   error_tail (status, errnum, message, args);
 316
 317 #ifdef _LIBC
 318   _IO_funlockfile (stderr);
 319 # ifdef __libc_ptf_call
 320   __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
 321 # endif
 322 #endif
 323 }
 324 \f
 325 /* Sometimes we want to have at most one error per line.  This
 326    variable controls whether this mode is selected or not.  */
 327 int error_one_per_line;
 328
 329 void
 330 error_at_line (int status, int errnum, const char *file_name,
 331                unsigned int line_number, const char *message, ...)
 332 {
 333   va_list args;
 334
 335   if (error_one_per_line)
 336     {
 337       static const char *old_file_name;
 338       static unsigned int old_line_number;
 339
 340       if (old_line_number == line_number
 341           && (file_name == old_file_name
 342               || strcmp (old_file_name, file_name) == 0))
 343         /* Simply return and print nothing.  */
 344         return;
 345
 346       old_file_name = file_name;
 347       old_line_number = line_number;
 348     }
 349
 350 #if defined _LIBC && defined __libc_ptf_call
 351   /* We do not want this call to be cut short by a thread
 352      cancellation.  Therefore disable cancellation for now.  */
 353   int state = PTHREAD_CANCEL_ENABLE;
 354   __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
 355                    0);
 356 #endif
 357
 358   flush_stdout ();
 359 #ifdef _LIBC
 360   _IO_flockfile (stderr);
 361 #endif
 362   if (error_print_progname)
 363     (*error_print_progname) ();
 364   else
 365     {
 366 #if _LIBC
 367       __fxprintf (NULL, "%s:", program_name);
 368 #else
 369       fprintf (stderr, "%s:", program_name);
 370 #endif
 371     }
 372
 373 #if _LIBC
 374   __fxprintf (NULL, file_name != NULL ? "%s:%d: " : " ",
 375               file_name, line_number);
 376 #else
 377   fprintf (stderr, file_name != NULL ? "%s:%d: " : " ",
 378            file_name, line_number);
 379 #endif
 380
 381   va_start (args, message);
 382   error_tail (status, errnum, message, args);
 383
 384 #ifdef _LIBC
 385   _IO_funlockfile (stderr);
 386 # ifdef __libc_ptf_call
 387   __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
 388 # endif
 389 #endif
 390 }
 391
 392 #ifdef _LIBC
 393 /* Make the weak alias.  */
 394 # undef error
 395 # undef error_at_line
 396 weak_alias (__error, error)
 397 weak_alias (__error_at_line, error_at_line)
 398 #endif