misc/error.c

   1 /* Error handler for noninteractive utilities
   2    Copyright (C) 1990-1998, 2000-2002, 2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.  Its master source is NOT part of
   4    the C library, however.  The master source lives in /gd/gnu/lib.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>.  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 # include <config.h>
  25 #endif
  26
  27 #include <stdio.h>
  28 #include <libintl.h>
  29 #ifdef _LIBC
  30 # include <wchar.h>
  31 # define mbsrtowcs __mbsrtowcs
  32 #endif
  33
  34 #if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
  35 # if __STDC__
  36 #  include <stdarg.h>
  37 #  define VA_START(args, lastarg) va_start(args, lastarg)
  38 # else
  39 #  include <varargs.h>
  40 #  define VA_START(args, lastarg) va_start(args)
  41 # endif
  42 #else
  43 # define va_alist a1, a2, a3, a4, a5, a6, a7, a8
  44 # define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
  45 #endif
  46
  47 #if STDC_HEADERS || _LIBC
  48 # include <stdlib.h>
  49 # include <string.h>
  50 #else
  51 void exit ();
  52 #endif
  53
  54 #include "error.h"
  55
  56 #ifndef _
  57 # define _(String) String
  58 #endif
  59
  60 /* If NULL, error will flush stdout, then print on stderr the program
  61    name, a colon and a space.  Otherwise, error will call this
  62    function without parameters instead.  */
  63 void (*error_print_progname) (
  64 #if __STDC__ - 0
  65                               void
  66 #endif
  67                               );
  68
  69 /* This variable is incremented each time `error' is called.  */
  70 unsigned int error_message_count;
  71
  72 #ifdef _LIBC
  73 /* In the GNU C library, there is a predefined variable for this.  */
  74
  75 # define program_name program_invocation_name
  76 # include <errno.h>
  77 # include <libio/libioP.h>
  78
  79 /* In GNU libc we want do not want to use the common name `error' directly.
  80    Instead make it a weak alias.  */
  81 extern void __error (int status, int errnum, const char *message, ...)
  82      __attribute__ ((__format__ (__printf__, 3, 4)));
  83 extern void __error_at_line (int status, int errnum, const char *file_name,
  84                              unsigned int line_number, const char *message,
  85                              ...)
  86      __attribute__ ((__format__ (__printf__, 5, 6)));;
  87 # define error __error
  88 # define error_at_line __error_at_line
  89
  90 # include <libio/iolibio.h>
  91 # define fflush(s) INTUSE(_IO_fflush) (s)
  92 # undef putc
  93 # define putc(c, fp) INTUSE(_IO_putc) (c, fp)
  94
  95 # include <bits/libc-lock.h>
  96
  97 #else /* not _LIBC */
  98
  99 # if !HAVE_DECL_STRERROR_R && STRERROR_R_CHAR_P
 100 #  ifndef HAVE_DECL_STRERROR_R
 101 "this configure-time declaration test was not run"
 102 #  endif
 103 char *strerror_r ();
 104 # endif
 105
 106 /* The calling program should define program_name and set it to the
 107    name of the executing program.  */
 108 extern char *program_name;
 109
 110 # if HAVE_STRERROR_R || defined strerror_r
 111 #  define __strerror_r strerror_r
 112 # else
 113 #  if HAVE_STRERROR
 114 #   ifndef HAVE_DECL_STRERROR
 115 "this configure-time declaration test was not run"
 116 #   endif
 117 #   if !HAVE_DECL_STRERROR
 118 char *strerror ();
 119 #   endif
 120 #  else
 121 static char *
 122 private_strerror (int errnum)
 123 {
 124   extern char *sys_errlist[];
 125   extern int sys_nerr;
 126
 127   if (errnum > 0 && errnum <= sys_nerr)
 128     return _(sys_errlist[errnum]);
 129   return _("Unknown system error");
 130 }
 131 #   define strerror private_strerror
 132 #  endif /* HAVE_STRERROR */
 133 # endif /* HAVE_STRERROR_R || defined strerror_r */
 134 #endif  /* not _LIBC */
 135
 136 static void
 137 print_errno_message (int errnum)
 138 {
 139   char const *s;
 140
 141 #if defined HAVE_STRERROR_R || _LIBC
 142   char errbuf[1024];
 143 # if STRERROR_R_CHAR_P || _LIBC
 144   s = __strerror_r (errnum, errbuf, sizeof errbuf);
 145 # else
 146   if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
 147     s = errbuf;
 148   else
 149     s = 0;
 150 # endif
 151 #else
 152   s = strerror (errnum);
 153 #endif
 154
 155 #if !_LIBC
 156   if (! s)
 157     s = _("Unknown system error");
 158 #endif
 159
 160 #if _LIBC
 161   if (_IO_fwide (stderr, 0) > 0)
 162     {
 163       __fwprintf (stderr, L": %s", s);
 164       return;
 165     }
 166 #endif
 167
 168   fprintf (stderr, ": %s", s);
 169 }
 170
 171 #ifdef VA_START
 172 static void
 173 error_tail (int status, int errnum, const char *message, va_list args)
 174 {
 175 # if HAVE_VPRINTF || _LIBC
 176 #  if _LIBC
 177   if (_IO_fwide (stderr, 0) > 0)
 178     {
 179 #   define ALLOCA_LIMIT 2000
 180       size_t len = strlen (message) + 1;
 181       wchar_t *wmessage = NULL;
 182       mbstate_t st;
 183       size_t res;
 184       const char *tmp;
 185
 186       do
 187         {
 188           if (len < ALLOCA_LIMIT)
 189             wmessage = (wchar_t *) alloca (len * sizeof (wchar_t));
 190           else
 191             {
 192               if (wmessage != NULL && len / 2 < ALLOCA_LIMIT)
 193                 wmessage = NULL;
 194
 195               wmessage = (wchar_t *) realloc (wmessage,
 196                                               len * sizeof (wchar_t));
 197
 198               if (wmessage == NULL)
 199                 {
 200                   fputws_unlocked (L"out of memory\n", stderr);
 201                   return;
 202                 }
 203             }
 204
 205           memset (&st, '\0', sizeof (st));
 206           tmp =message;
 207         }
 208       while ((res = mbsrtowcs (wmessage, &tmp, len, &st)) == len);
 209
 210       if (res == (size_t) -1)
 211         /* The string cannot be converted.  */
 212         wmessage = (wchar_t *) L"???";
 213
 214       __vfwprintf (stderr, wmessage, args);
 215     }
 216   else
 217 #  endif
 218     vfprintf (stderr, message, args);
 219 # else
 220   _doprnt (message, args, stderr);
 221 # endif
 222   va_end (args);
 223
 224   ++error_message_count;
 225   if (errnum)
 226     print_errno_message (errnum);
 227 # if _LIBC
 228   if (_IO_fwide (stderr, 0) > 0)
 229     putwc (L'\n', stderr);
 230   else
 231 # endif
 232     putc ('\n', stderr);
 233   fflush (stderr);
 234   if (status)
 235     exit (status);
 236 }
 237 #endif
 238
 239
 240 /* Print the program name and error message MESSAGE, which is a printf-style
 241    format string with optional args.
 242    If ERRNUM is nonzero, print its corresponding system error message.
 243    Exit with status STATUS if it is nonzero.  */
 244 /* VARARGS */
 245 void
 246 #if defined VA_START && __STDC__
 247 error (int status, int errnum, const char *message, ...)
 248 #else
 249 error (status, errnum, message, va_alist)
 250      int status;
 251      int errnum;
 252      char *message;
 253      va_dcl
 254 #endif
 255 {
 256 #ifdef VA_START
 257   va_list args;
 258 #endif
 259
 260 #if defined _LIBC && defined __libc_ptf_call
 261   /* We do not want this call to be cut short by a thread
 262      cancellation.  Therefore disable cancellation for now.  */
 263   int state = PTHREAD_CANCEL_ENABLE;
 264   __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
 265                    0);
 266 #endif
 267
 268   fflush (stdout);
 269 #ifdef _LIBC
 270   _IO_flockfile (stderr);
 271 #endif
 272   if (error_print_progname)
 273     (*error_print_progname) ();
 274   else
 275     {
 276 #if _LIBC
 277       if (_IO_fwide (stderr, 0) > 0)
 278         __fwprintf (stderr, L"%s: ", program_name);
 279       else
 280 #endif
 281         fprintf (stderr, "%s: ", program_name);
 282     }
 283
 284 #ifdef VA_START
 285   VA_START (args, message);
 286   error_tail (status, errnum, message, args);
 287 #else
 288   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 289
 290   ++error_message_count;
 291   if (errnum)
 292     print_errno_message (errnum);
 293   putc ('\n', stderr);
 294   fflush (stderr);
 295   if (status)
 296     exit (status);
 297 #endif
 298
 299 #ifdef _LIBC
 300   _IO_funlockfile (stderr);
 301 # ifdef __libc_ptf_call
 302   __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
 303 # endif
 304 #endif
 305 }
 306 \f
 307 /* Sometimes we want to have at most one error per line.  This
 308    variable controls whether this mode is selected or not.  */
 309 int error_one_per_line;
 310
 311 void
 312 #if defined VA_START && __STDC__
 313 error_at_line (int status, int errnum, const char *file_name,
 314                unsigned int line_number, const char *message, ...)
 315 #else
 316 error_at_line (status, errnum, file_name, line_number, message, va_alist)
 317      int status;
 318      int errnum;
 319      const char *file_name;
 320      unsigned int line_number;
 321      char *message;
 322      va_dcl
 323 #endif
 324 {
 325 #ifdef VA_START
 326   va_list args;
 327 #endif
 328
 329   if (error_one_per_line)
 330     {
 331       static const char *old_file_name;
 332       static unsigned int old_line_number;
 333
 334       if (old_line_number == line_number
 335           && (file_name == old_file_name
 336               || strcmp (old_file_name, file_name) == 0))
 337         /* Simply return and print nothing.  */
 338         return;
 339
 340       old_file_name = file_name;
 341       old_line_number = line_number;
 342     }
 343
 344 #if defined _LIBC && defined __libc_ptf_call
 345   /* We do not want this call to be cut short by a thread
 346      cancellation.  Therefore disable cancellation for now.  */
 347   int state = PTHREAD_CANCEL_ENABLE;
 348   __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
 349                    0);
 350 #endif
 351
 352   fflush (stdout);
 353 #ifdef _LIBC
 354   _IO_flockfile (stderr);
 355 #endif
 356   if (error_print_progname)
 357     (*error_print_progname) ();
 358   else
 359     {
 360 #if _LIBC
 361       if (_IO_fwide (stderr, 0) > 0)
 362         __fwprintf (stderr, L"%s: ", program_name);
 363       else
 364 #endif
 365         fprintf (stderr, "%s:", program_name);
 366     }
 367
 368   if (file_name != NULL)
 369     {
 370 #if _LIBC
 371       if (_IO_fwide (stderr, 0) > 0)
 372         __fwprintf (stderr, L"%s:%d: ", file_name, line_number);
 373       else
 374 #endif
 375         fprintf (stderr, "%s:%d: ", file_name, line_number);
 376     }
 377
 378 #ifdef VA_START
 379   VA_START (args, message);
 380   error_tail (status, errnum, message, args);
 381 #else
 382   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 383
 384   ++error_message_count;
 385   if (errnum)
 386     print_errno_message (errnum);
 387   putc ('\n', stderr);
 388   fflush (stderr);
 389   if (status)
 390     exit (status);
 391 #endif
 392
 393 #ifdef _LIBC
 394   _IO_funlockfile (stderr);
 395 # ifdef __libc_ptf_call
 396   __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
 397 # endif
 398 #endif
 399 }
 400
 401 #ifdef _LIBC
 402 /* Make the weak alias.  */
 403 # undef error
 404 # undef error_at_line
 405 weak_alias (__error, error)
 406 weak_alias (__error_at_line, error_at_line)
 407 #endif