lib/error.c

   1 /* Error handler for noninteractive utilities
   2    Copyright (C) 1990-1998, 2000, 2001, 2002 Free Software Foundation, Inc.
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; either version 2, or (at your option)
   6    any later version.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License along
  14    with this program; if not, write to the Free Software Foundation,
  15    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  16
  17 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22
  23 #include <stdio.h>
  24
  25 #ifdef _LIBC
  26 # include <libintl.h>
  27 #else
  28 # include "gettext.h"
  29 #endif
  30
  31 #ifdef _LIBC
  32 # include <wchar.h>
  33 # define mbsrtowcs __mbsrtowcs
  34 #endif
  35
  36 #if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
  37 # if __STDC__
  38 #  include <stdarg.h>
  39 #  define VA_START(args, lastarg) va_start(args, lastarg)
  40 # else
  41 #  include <varargs.h>
  42 #  define VA_START(args, lastarg) va_start(args)
  43 # endif
  44 #else
  45 # define va_alist a1, a2, a3, a4, a5, a6, a7, a8
  46 # define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
  47 #endif
  48
  49 #if STDC_HEADERS || _LIBC
  50 # include <stdlib.h>
  51 # include <string.h>
  52 #else
  53 void exit ();
  54 #endif
  55
  56 #include "error.h"
  57
  58 #if !_LIBC
  59 # include "unlocked-io.h"
  60 #endif
  61
  62 #ifndef _
  63 # define _(String) String
  64 #endif
  65
  66 /* If NULL, error will flush stdout, then print on stderr the program
  67    name, a colon and a space.  Otherwise, error will call this
  68    function without parameters instead.  */
  69 void (*error_print_progname) (
  70 #if __STDC__ - 0
  71                               void
  72 #endif
  73                               );
  74
  75 /* This variable is incremented each time `error' is called.  */
  76 unsigned int error_message_count;
  77
  78 #ifdef _LIBC
  79 /* In the GNU C library, there is a predefined variable for this.  */
  80
  81 # define program_name program_invocation_name
  82 # include <errno.h>
  83 # include <libio/libioP.h>
  84
  85 /* In GNU libc we want do not want to use the common name `error' directly.
  86    Instead make it a weak alias.  */
  87 extern void __error (int status, int errnum, const char *message, ...)
  88      __attribute__ ((__format__ (__printf__, 3, 4)));
  89 extern void __error_at_line (int status, int errnum, const char *file_name,
  90                              unsigned int line_number, const char *message,
  91                              ...)
  92      __attribute__ ((__format__ (__printf__, 5, 6)));;
  93 # define error __error
  94 # define error_at_line __error_at_line
  95
  96 # ifdef USE_IN_LIBIO
  97 #  include <libio/iolibio.h>
  98 #  define fflush(s) INTUSE(_IO_fflush) (s)
  99 #  undef putc
 100 #  define putc(c, fp) INTUSE(_IO_putc) (c, fp)
 101 # endif
 102
 103 #else /* not _LIBC */
 104
 105 # if !HAVE_DECL_STRERROR_R && STRERROR_R_CHAR_P
 106 #  ifndef HAVE_DECL_STRERROR_R
 107 "this configure-time declaration test was not run"
 108 #  endif
 109 char *strerror_r ();
 110 # endif
 111
 112 /* The calling program should define program_name and set it to the
 113    name of the executing program.  */
 114 extern char *program_name;
 115
 116 # if HAVE_STRERROR_R || defined strerror_r
 117 #  define __strerror_r strerror_r
 118 # else
 119 #  if HAVE_STRERROR
 120 #   ifndef HAVE_DECL_STRERROR
 121 "this configure-time declaration test was not run"
 122 #   endif
 123 #   if !HAVE_DECL_STRERROR
 124 char *strerror ();
 125 #   endif
 126 #  else
 127 static char *
 128 private_strerror (int errnum)
 129 {
 130   extern char *sys_errlist[];
 131   extern int sys_nerr;
 132
 133   if (errnum > 0 && errnum <= sys_nerr)
 134     return _(sys_errlist[errnum]);
 135   return _("Unknown system error");
 136 }
 137 #   define strerror private_strerror
 138 #  endif /* HAVE_STRERROR */
 139 # endif /* HAVE_STRERROR_R || defined strerror_r */
 140 #endif  /* not _LIBC */
 141
 142 static void
 143 print_errno_message (int errnum)
 144 {
 145   char const *s;
 146
 147 #if defined HAVE_STRERROR_R || _LIBC
 148   char errbuf[1024];
 149 # if STRERROR_R_CHAR_P || _LIBC
 150   s = __strerror_r (errnum, errbuf, sizeof errbuf);
 151 # else
 152   if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
 153     s = errbuf;
 154   else
 155     s = 0;
 156 # endif
 157 #else
 158   s = strerror (errnum);
 159 #endif
 160
 161 #if !_LIBC
 162   if (! s)
 163     s = _("Unknown system error");
 164 #endif
 165
 166 #if _LIBC && USE_IN_LIBIO
 167   if (_IO_fwide (stderr, 0) > 0)
 168     {
 169       __fwprintf (stderr, L": %s", s);
 170       return;
 171     }
 172 #endif
 173
 174   fprintf (stderr, ": %s", s);
 175 }
 176
 177 #ifdef VA_START
 178 static void
 179 error_tail (int status, int errnum, const char *message, va_list args)
 180 {
 181 # if HAVE_VPRINTF || _LIBC
 182 #  if _LIBC && USE_IN_LIBIO
 183   if (_IO_fwide (stderr, 0) > 0)
 184     {
 185 #   define ALLOCA_LIMIT 2000
 186       size_t len = strlen (message) + 1;
 187       wchar_t *wmessage = NULL;
 188       mbstate_t st;
 189       size_t res;
 190       const char *tmp;
 191
 192       do
 193         {
 194           if (len < ALLOCA_LIMIT)
 195             wmessage = (wchar_t *) alloca (len * sizeof (wchar_t));
 196           else
 197             {
 198               if (wmessage != NULL && len / 2 < ALLOCA_LIMIT)
 199                 wmessage = NULL;
 200
 201               wmessage = (wchar_t *) realloc (wmessage,
 202                                               len * sizeof (wchar_t));
 203
 204               if (wmessage == NULL)
 205                 {
 206                   fputws_unlocked (L"out of memory\n", stderr);
 207                   return;
 208                 }
 209             }
 210
 211           memset (&st, '\0', sizeof (st));
 212           tmp =message;
 213         }
 214       while ((res = mbsrtowcs (wmessage, &tmp, len, &st)) == len);
 215
 216       if (res == (size_t) -1)
 217         /* The string cannot be converted.  */
 218         wmessage = (wchar_t *) L"???";
 219
 220       __vfwprintf (stderr, wmessage, args);
 221     }
 222   else
 223 #  endif
 224     vfprintf (stderr, message, args);
 225 # else
 226   _doprnt (message, args, stderr);
 227 # endif
 228   va_end (args);
 229
 230   ++error_message_count;
 231   if (errnum)
 232     print_errno_message (errnum);
 233 # if _LIBC && USE_IN_LIBIO
 234   if (_IO_fwide (stderr, 0) > 0)
 235     putwc (L'\n', stderr);
 236   else
 237 # endif
 238     putc ('\n', stderr);
 239   fflush (stderr);
 240   if (status)
 241     exit (status);
 242 }
 243 #endif
 244
 245
 246 /* Print the program name and error message MESSAGE, which is a printf-style
 247    format string with optional args.
 248    If ERRNUM is nonzero, print its corresponding system error message.
 249    Exit with status STATUS if it is nonzero.  */
 250 /* VARARGS */
 251 void
 252 #if defined VA_START && __STDC__
 253 error (int status, int errnum, const char *message, ...)
 254 #else
 255 error (status, errnum, message, va_alist)
 256      int status;
 257      int errnum;
 258      char *message;
 259      va_dcl
 260 #endif
 261 {
 262 #ifdef VA_START
 263   va_list args;
 264 #endif
 265
 266   fflush (stdout);
 267 #ifdef _LIBC
 268 # ifdef USE_IN_LIBIO
 269   _IO_flockfile (stderr);
 270 # else
 271   __flockfile (stderr);
 272 # endif
 273 #endif
 274   if (error_print_progname)
 275     (*error_print_progname) ();
 276   else
 277     {
 278 #if _LIBC && USE_IN_LIBIO
 279       if (_IO_fwide (stderr, 0) > 0)
 280         __fwprintf (stderr, L"%s: ", program_name);
 281       else
 282 #endif
 283         fprintf (stderr, "%s: ", program_name);
 284     }
 285
 286 #ifdef VA_START
 287   VA_START (args, message);
 288   error_tail (status, errnum, message, args);
 289 #else
 290   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 291
 292   ++error_message_count;
 293   if (errnum)
 294     print_errno_message (errnum);
 295   putc ('\n', stderr);
 296   fflush (stderr);
 297   if (status)
 298     exit (status);
 299 #endif
 300
 301 #ifdef _LIBC
 302 # ifdef USE_IN_LIBIO
 303   _IO_funlockfile (stderr);
 304 # else
 305   __funlockfile (stderr);
 306 # endif
 307 #endif
 308 }
 309 \f
 310 /* Sometimes we want to have at most one error per line.  This
 311    variable controls whether this mode is selected or not.  */
 312 int error_one_per_line;
 313
 314 void
 315 #if defined VA_START && __STDC__
 316 error_at_line (int status, int errnum, const char *file_name,
 317                unsigned int line_number, const char *message, ...)
 318 #else
 319 error_at_line (status, errnum, file_name, line_number, message, va_alist)
 320      int status;
 321      int errnum;
 322      const char *file_name;
 323      unsigned int line_number;
 324      char *message;
 325      va_dcl
 326 #endif
 327 {
 328 #ifdef VA_START
 329   va_list args;
 330 #endif
 331
 332   if (error_one_per_line)
 333     {
 334       static const char *old_file_name;
 335       static unsigned int old_line_number;
 336
 337       if (old_line_number == line_number
 338           && (file_name == old_file_name
 339               || strcmp (old_file_name, file_name) == 0))
 340         /* Simply return and print nothing.  */
 341         return;
 342
 343       old_file_name = file_name;
 344       old_line_number = line_number;
 345     }
 346
 347   fflush (stdout);
 348 #ifdef _LIBC
 349 # ifdef USE_IN_LIBIO
 350   _IO_flockfile (stderr);
 351 # else
 352   __flockfile (stderr);
 353 # endif
 354 #endif
 355   if (error_print_progname)
 356     (*error_print_progname) ();
 357   else
 358     {
 359 #if _LIBC && USE_IN_LIBIO
 360       if (_IO_fwide (stderr, 0) > 0)
 361         __fwprintf (stderr, L"%s: ", program_name);
 362       else
 363 #endif
 364         fprintf (stderr, "%s:", program_name);
 365     }
 366
 367   if (file_name != NULL)
 368     {
 369 #if _LIBC && USE_IN_LIBIO
 370       if (_IO_fwide (stderr, 0) > 0)
 371         __fwprintf (stderr, L"%s:%d: ", file_name, line_number);
 372       else
 373 #endif
 374         fprintf (stderr, "%s:%d: ", file_name, line_number);
 375     }
 376
 377 #ifdef VA_START
 378   VA_START (args, message);
 379   error_tail (status, errnum, message, args);
 380 #else
 381   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 382
 383   ++error_message_count;
 384   if (errnum)
 385     print_errno_message (errnum);
 386   putc ('\n', stderr);
 387   fflush (stderr);
 388   if (status)
 389     exit (status);
 390 #endif
 391
 392 #ifdef _LIBC
 393 # ifdef USE_IN_LIBIO
 394   _IO_funlockfile (stderr);
 395 # else
 396   __funlockfile (stderr);
 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