arch/all-pc/boot/grub2-aros/grub-core/gnulib/error.c

   1 /* Error handler for noninteractive utilities
   2    Copyright (C) 1990-1998, 2000-2007, 2009-2010 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 && STRERROR_R_CHAR_P
 101 #  ifndef HAVE_DECL_STRERROR_R
 102 "this configure-time declaration test was not run"
 103 #  endif
 104 char *strerror_r ();
 105 # endif
 106
 107 /* The calling program should define program_name and set it to the
 108    name of the executing program.  */
 109 extern char *program_name;
 110
 111 # if HAVE_STRERROR_R || defined strerror_r
 112 #  define __strerror_r strerror_r
 113 # endif /* HAVE_STRERROR_R || defined strerror_r */
 114 #endif  /* not _LIBC */
 115
 116 #if !_LIBC
 117 /* Return non-zero if FD is open.  */
 118 static inline int
 119 is_open (int fd)
 120 {
 121 # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
 122   /* On Win32: The initial state of unassigned standard file descriptors is
 123      that they are open but point to an INVALID_HANDLE_VALUE.  There is no
 124      fcntl, and the gnulib replacement fcntl does not support F_GETFL.  */
 125   return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
 126 # else
 127 #  ifndef F_GETFL
 128 #   error Please port fcntl to your platform
 129 #  endif
 130   return 0 <= fcntl (fd, F_GETFL);
 131 # endif
 132 }
 133 #endif
 134
 135 static inline void
 136 flush_stdout (void)
 137 {
 138 #if !_LIBC
 139   int stdout_fd;
 140
 141 # if GNULIB_FREOPEN_SAFER
 142   /* Use of gnulib's freopen-safer module normally ensures that
 143        fileno (stdout) == 1
 144      whenever stdout is open.  */
 145   stdout_fd = STDOUT_FILENO;
 146 # else
 147   /* POSIX states that fileno (stdout) after fclose is unspecified.  But in
 148      practice it is not a problem, because stdout is statically allocated and
 149      the fd of a FILE stream is stored as a field in its allocated memory.  */
 150   stdout_fd = fileno (stdout);
 151 # endif
 152   /* POSIX states that fflush (stdout) after fclose is unspecified; it
 153      is safe in glibc, but not on all other platforms.  fflush (NULL)
 154      is always defined, but too draconian.  */
 155   if (0 <= stdout_fd && is_open (stdout_fd))
 156 #endif
 157     fflush (stdout);
 158 }
 159
 160 static void
 161 print_errno_message (int errnum)
 162 {
 163   char const *s;
 164
 165 #if defined HAVE_STRERROR_R || _LIBC
 166   char errbuf[1024];
 167 # if STRERROR_R_CHAR_P || _LIBC
 168   s = __strerror_r (errnum, errbuf, sizeof errbuf);
 169 # else
 170   if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
 171     s = errbuf;
 172   else
 173     s = 0;
 174 # endif
 175 #else
 176   s = strerror (errnum);
 177 #endif
 178
 179 #if !_LIBC
 180   if (! s)
 181     s = _("Unknown system error");
 182 #endif
 183
 184 #if _LIBC
 185   __fxprintf (NULL, ": %s", s);
 186 #else
 187   fprintf (stderr, ": %s", s);
 188 #endif
 189 }
 190
 191 static void
 192 error_tail (int status, int errnum, const char *message, va_list args)
 193 {
 194 #if _LIBC
 195   if (_IO_fwide (stderr, 0) > 0)
 196     {
 197 # define ALLOCA_LIMIT 2000
 198       size_t len = strlen (message) + 1;
 199       wchar_t *wmessage = NULL;
 200       mbstate_t st;
 201       size_t res;
 202       const char *tmp;
 203       bool use_malloc = false;
 204
 205       while (1)
 206         {
 207           if (__libc_use_alloca (len * sizeof (wchar_t)))
 208             wmessage = (wchar_t *) alloca (len * sizeof (wchar_t));
 209           else
 210             {
 211               if (!use_malloc)
 212                 wmessage = NULL;
 213
 214               wchar_t *p = (wchar_t *) realloc (wmessage,
 215                                                 len * sizeof (wchar_t));
 216               if (p == NULL)
 217                 {
 218                   free (wmessage);
 219                   fputws_unlocked (L"out of memory\n", stderr);
 220                   return;
 221                 }
 222               wmessage = p;
 223               use_malloc = true;
 224             }
 225
 226           memset (&st, '\0', sizeof (st));
 227           tmp = message;
 228
 229           res = mbsrtowcs (wmessage, &tmp, len, &st);
 230           if (res != len)
 231             break;
 232
 233           if (__builtin_expect (len >= SIZE_MAX / 2, 0))
 234             {
 235               /* This really should not happen if everything is fine.  */
 236               res = (size_t) -1;
 237               break;
 238             }
 239
 240           len *= 2;
 241         }
 242
 243       if (res == (size_t) -1)
 244         {
 245           /* The string cannot be converted.  */
 246           if (use_malloc)
 247             {
 248               free (wmessage);
 249               use_malloc = false;
 250             }
 251           wmessage = (wchar_t *) L"???";
 252         }
 253
 254       __vfwprintf (stderr, wmessage, args);
 255
 256       if (use_malloc)
 257         free (wmessage);
 258     }
 259   else
 260 #endif
 261     vfprintf (stderr, message, args);
 262   va_end (args);
 263
 264   ++error_message_count;
 265   if (errnum)
 266     print_errno_message (errnum);
 267 #if _LIBC
 268   __fxprintf (NULL, "\n");
 269 #else
 270   putc ('\n', stderr);
 271 #endif
 272   fflush (stderr);
 273   if (status)
 274     exit (status);
 275 }
 276
 277
 278 /* Print the program name and error message MESSAGE, which is a printf-style
 279    format string with optional args.
 280    If ERRNUM is nonzero, print its corresponding system error message.
 281    Exit with status STATUS if it is nonzero.  */
 282 void
 283 error (int status, int errnum, const char *message, ...)
 284 {
 285   va_list args;
 286
 287 #if defined _LIBC && defined __libc_ptf_call
 288   /* We do not want this call to be cut short by a thread
 289      cancellation.  Therefore disable cancellation for now.  */
 290   int state = PTHREAD_CANCEL_ENABLE;
 291   __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
 292                    0);
 293 #endif
 294
 295   flush_stdout ();
 296 #ifdef _LIBC
 297   _IO_flockfile (stderr);
 298 #endif
 299   if (error_print_progname)
 300     (*error_print_progname) ();
 301   else
 302     {
 303 #if _LIBC
 304       __fxprintf (NULL, "%s: ", program_name);
 305 #else
 306       fprintf (stderr, "%s: ", program_name);
 307 #endif
 308     }
 309
 310   va_start (args, message);
 311   error_tail (status, errnum, message, args);
 312
 313 #ifdef _LIBC
 314   _IO_funlockfile (stderr);
 315 # ifdef __libc_ptf_call
 316   __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
 317 # endif
 318 #endif
 319 }
 320 \f
 321 /* Sometimes we want to have at most one error per line.  This
 322    variable controls whether this mode is selected or not.  */
 323 int error_one_per_line;
 324
 325 void
 326 error_at_line (int status, int errnum, const char *file_name,
 327                unsigned int line_number, const char *message, ...)
 328 {
 329   va_list args;
 330
 331   if (error_one_per_line)
 332     {
 333       static const char *old_file_name;
 334       static unsigned int old_line_number;
 335
 336       if (old_line_number == line_number
 337           && (file_name == old_file_name
 338               || strcmp (old_file_name, file_name) == 0))
 339         /* Simply return and print nothing.  */
 340         return;
 341
 342       old_file_name = file_name;
 343       old_line_number = line_number;
 344     }
 345
 346 #if defined _LIBC && defined __libc_ptf_call
 347   /* We do not want this call to be cut short by a thread
 348      cancellation.  Therefore disable cancellation for now.  */
 349   int state = PTHREAD_CANCEL_ENABLE;
 350   __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
 351                    0);
 352 #endif
 353
 354   flush_stdout ();
 355 #ifdef _LIBC
 356   _IO_flockfile (stderr);
 357 #endif
 358   if (error_print_progname)
 359     (*error_print_progname) ();
 360   else
 361     {
 362 #if _LIBC
 363       __fxprintf (NULL, "%s:", program_name);
 364 #else
 365       fprintf (stderr, "%s:", program_name);
 366 #endif
 367     }
 368
 369 #if _LIBC
 370   __fxprintf (NULL, file_name != NULL ? "%s:%d: " : " ",
 371               file_name, line_number);
 372 #else
 373   fprintf (stderr, file_name != NULL ? "%s:%d: " : " ",
 374            file_name, line_number);
 375 #endif
 376
 377   va_start (args, message);
 378   error_tail (status, errnum, message, args);
 379
 380 #ifdef _LIBC
 381   _IO_funlockfile (stderr);
 382 # ifdef __libc_ptf_call
 383   __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
 384 # endif
 385 #endif
 386 }
 387
 388 #ifdef _LIBC
 389 /* Make the weak alias.  */
 390 # undef error
 391 # undef error_at_line
 392 weak_alias (__error, error)
 393 weak_alias (__error_at_line, error_at_line)
 394 #endif