gl/error.c

   1 /* Error handler for noninteractive utilities
   2    Copyright (C) 1990-1998, 2000, 2001, 2002, 2003 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 # include <libio/iolibio.h>
  97 # define fflush(s) INTUSE(_IO_fflush) (s)
  98 # undef putc
  99 # define putc(c, fp) INTUSE(_IO_putc) (c, fp)
 100
 101 #else /* not _LIBC */
 102
 103 # if !HAVE_DECL_STRERROR_R && STRERROR_R_CHAR_P
 104 #  ifndef HAVE_DECL_STRERROR_R
 105 "this configure-time declaration test was not run"
 106 #  endif
 107 char *strerror_r ();
 108 # endif
 109
 110 /* The calling program should define program_name and set it to the
 111    name of the executing program.  */
 112 extern char *program_name;
 113
 114 # if HAVE_STRERROR_R || defined strerror_r
 115 #  define __strerror_r strerror_r
 116 # else
 117 #  if HAVE_STRERROR
 118 #   ifndef HAVE_DECL_STRERROR
 119 "this configure-time declaration test was not run"
 120 #   endif
 121 #   if !HAVE_DECL_STRERROR
 122 char *strerror ();
 123 #   endif
 124 #  else
 125 static char *
 126 private_strerror (int errnum)
 127 {
 128   extern char *sys_errlist[];
 129   extern int sys_nerr;
 130
 131   if (errnum > 0 && errnum <= sys_nerr)
 132     return _(sys_errlist[errnum]);
 133   return _("Unknown system error");
 134 }
 135 #   define strerror private_strerror
 136 #  endif /* HAVE_STRERROR */
 137 # endif /* HAVE_STRERROR_R || defined strerror_r */
 138 #endif  /* not _LIBC */
 139
 140 static void
 141 print_errno_message (int errnum)
 142 {
 143   char const *s;
 144
 145 #if defined HAVE_STRERROR_R || _LIBC
 146   char errbuf[1024];
 147 # if STRERROR_R_CHAR_P || _LIBC
 148   s = __strerror_r (errnum, errbuf, sizeof errbuf);
 149 # else
 150   if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
 151     s = errbuf;
 152   else
 153     s = 0;
 154 # endif
 155 #else
 156   s = strerror (errnum);
 157 #endif
 158
 159 #if !_LIBC
 160   if (! s)
 161     s = _("Unknown system error");
 162 #endif
 163
 164 #if _LIBC
 165   if (_IO_fwide (stderr, 0) > 0)
 166     {
 167       __fwprintf (stderr, L": %s", s);
 168       return;
 169     }
 170 #endif
 171
 172   fprintf (stderr, ": %s", s);
 173 }
 174
 175 #ifdef VA_START
 176 static void
 177 error_tail (int status, int errnum, const char *message, va_list args)
 178 {
 179 # if HAVE_VPRINTF || _LIBC
 180 #  if _LIBC
 181   if (_IO_fwide (stderr, 0) > 0)
 182     {
 183 #   define ALLOCA_LIMIT 2000
 184       size_t len = strlen (message) + 1;
 185       wchar_t *wmessage = NULL;
 186       mbstate_t st;
 187       size_t res;
 188       const char *tmp;
 189
 190       do
 191         {
 192           if (len < ALLOCA_LIMIT)
 193             wmessage = (wchar_t *) alloca (len * sizeof (wchar_t));
 194           else
 195             {
 196               if (wmessage != NULL && len / 2 < ALLOCA_LIMIT)
 197                 wmessage = NULL;
 198
 199               wmessage = (wchar_t *) realloc (wmessage,
 200                                               len * sizeof (wchar_t));
 201
 202               if (wmessage == NULL)
 203                 {
 204                   fputws_unlocked (L"out of memory\n", stderr);
 205                   return;
 206                 }
 207             }
 208
 209           memset (&st, '\0', sizeof (st));
 210           tmp =message;
 211         }
 212       while ((res = mbsrtowcs (wmessage, &tmp, len, &st)) == len);
 213
 214       if (res == (size_t) -1)
 215         /* The string cannot be converted.  */
 216         wmessage = (wchar_t *) L"???";
 217
 218       __vfwprintf (stderr, wmessage, args);
 219     }
 220   else
 221 #  endif
 222     vfprintf (stderr, message, args);
 223 # else
 224   _doprnt (message, args, stderr);
 225 # endif
 226   va_end (args);
 227
 228   ++error_message_count;
 229   if (errnum)
 230     print_errno_message (errnum);
 231 # if _LIBC
 232   if (_IO_fwide (stderr, 0) > 0)
 233     putwc (L'\n', stderr);
 234   else
 235 # endif
 236     putc ('\n', stderr);
 237   fflush (stderr);
 238   if (status)
 239     exit (status);
 240 }
 241 #endif
 242
 243
 244 /* Print the program name and error message MESSAGE, which is a printf-style
 245    format string with optional args.
 246    If ERRNUM is nonzero, print its corresponding system error message.
 247    Exit with status STATUS if it is nonzero.  */
 248 /* VARARGS */
 249 void
 250 #if defined VA_START && __STDC__
 251 error (int status, int errnum, const char *message, ...)
 252 #else
 253 error (status, errnum, message, va_alist)
 254      int status;
 255      int errnum;
 256      char *message;
 257      va_dcl
 258 #endif
 259 {
 260 #ifdef VA_START
 261   va_list args;
 262 #endif
 263
 264   fflush (stdout);
 265 #ifdef _LIBC
 266   _IO_flockfile (stderr);
 267 #endif
 268   if (error_print_progname)
 269     (*error_print_progname) ();
 270   else
 271     {
 272 #if _LIBC
 273       if (_IO_fwide (stderr, 0) > 0)
 274         __fwprintf (stderr, L"%s: ", program_name);
 275       else
 276 #endif
 277         fprintf (stderr, "%s: ", program_name);
 278     }
 279
 280 #ifdef VA_START
 281   VA_START (args, message);
 282   error_tail (status, errnum, message, args);
 283 #else
 284   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 285
 286   ++error_message_count;
 287   if (errnum)
 288     print_errno_message (errnum);
 289   putc ('\n', stderr);
 290   fflush (stderr);
 291   if (status)
 292     exit (status);
 293 #endif
 294
 295 #ifdef _LIBC
 296   _IO_funlockfile (stderr);
 297 #endif
 298 }
 299 \f
 300 /* Sometimes we want to have at most one error per line.  This
 301    variable controls whether this mode is selected or not.  */
 302 int error_one_per_line;
 303
 304 void
 305 #if defined VA_START && __STDC__
 306 error_at_line (int status, int errnum, const char *file_name,
 307                unsigned int line_number, const char *message, ...)
 308 #else
 309 error_at_line (status, errnum, file_name, line_number, message, va_alist)
 310      int status;
 311      int errnum;
 312      const char *file_name;
 313      unsigned int line_number;
 314      char *message;
 315      va_dcl
 316 #endif
 317 {
 318 #ifdef VA_START
 319   va_list args;
 320 #endif
 321
 322   if (error_one_per_line)
 323     {
 324       static const char *old_file_name;
 325       static unsigned int old_line_number;
 326
 327       if (old_line_number == line_number
 328           && (file_name == old_file_name
 329               || strcmp (old_file_name, file_name) == 0))
 330         /* Simply return and print nothing.  */
 331         return;
 332
 333       old_file_name = file_name;
 334       old_line_number = line_number;
 335     }
 336
 337   fflush (stdout);
 338 #ifdef _LIBC
 339   _IO_flockfile (stderr);
 340 #endif
 341   if (error_print_progname)
 342     (*error_print_progname) ();
 343   else
 344     {
 345 #if _LIBC
 346       if (_IO_fwide (stderr, 0) > 0)
 347         __fwprintf (stderr, L"%s: ", program_name);
 348       else
 349 #endif
 350         fprintf (stderr, "%s:", program_name);
 351     }
 352
 353   if (file_name != NULL)
 354     {
 355 #if _LIBC
 356       if (_IO_fwide (stderr, 0) > 0)
 357         __fwprintf (stderr, L"%s:%d: ", file_name, line_number);
 358       else
 359 #endif
 360         fprintf (stderr, "%s:%d: ", file_name, line_number);
 361     }
 362
 363 #ifdef VA_START
 364   VA_START (args, message);
 365   error_tail (status, errnum, message, args);
 366 #else
 367   fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
 368
 369   ++error_message_count;
 370   if (errnum)
 371     print_errno_message (errnum);
 372   putc ('\n', stderr);
 373   fflush (stderr);
 374   if (status)
 375     exit (status);
 376 #endif
 377
 378 #ifdef _LIBC
 379   _IO_funlockfile (stderr);
 380 #endif
 381 }
 382
 383 #ifdef _LIBC
 384 /* Make the weak alias.  */
 385 # undef error
 386 # undef error_at_line
 387 weak_alias (__error, error)
 388 weak_alias (__error_at_line, error_at_line)
 389 #endif