external/gpl2/xcvs/dist/lib/error.c

   1 /* Error handler for noninteractive utilities
   2    Copyright (C) 1990-1998, 2000-2003, 2004 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 2, or (at your option)
   8    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 along
  16    with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>.  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include "error.h"
  26
  27 #include <stdarg.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #if !_LIBC && ENABLE_NLS
  33 # include "gettext.h"
  34 #endif
  35
  36 #ifdef _LIBC
  37 # include <wchar.h>
  38 # define mbsrtowcs __mbsrtowcs
  39 #endif
  40
  41 #if USE_UNLOCKED_IO
  42 # include "unlocked-io.h"
  43 #endif
  44
  45 #ifndef _
  46 # define _(String) String
  47 #endif
  48
  49 /* If NULL, error will flush stdout, then print on stderr the program
  50    name, a colon and a space.  Otherwise, error will call this
  51    function without parameters instead.  */
  52 void (*error_print_progname) (void);
  53
  54 /* This variable is incremented each time `error' is called.  */
  55 unsigned int error_message_count;
  56
  57 #ifdef _LIBC
  58 /* In the GNU C library, there is a predefined variable for this.  */
  59
  60 # define program_name program_invocation_name
  61 # include <errno.h>
  62 # include <libio/libioP.h>
  63
  64 /* In GNU libc we want do not want to use the common name `error' directly.
  65    Instead make it a weak alias.  */
  66 extern void __error (int status, int errnum, const char *message, ...)
  67      __attribute__ ((__format__ (__printf__, 3, 4)));
  68 extern void __error_at_line (int status, int errnum, const char *file_name,
  69                              unsigned int line_number, const char *message,
  70                              ...)
  71      __attribute__ ((__format__ (__printf__, 5, 6)));;
  72 # define error __error
  73 # define error_at_line __error_at_line
  74
  75 # include <libio/iolibio.h>
  76 # define fflush(s) INTUSE(_IO_fflush) (s)
  77 # undef putc
  78 # define putc(c, fp) INTUSE(_IO_putc) (c, fp)
  79
  80 # include <bits/libc-lock.h>
  81
  82 #else /* not _LIBC */
  83
  84 # if !HAVE_DECL_STRERROR_R && STRERROR_R_CHAR_P
  85 #  ifndef HAVE_DECL_STRERROR_R
  86 "this configure-time declaration test was not run"
  87 #  endif
  88 char *strerror_r ();
  89 # endif
  90
  91 # ifndef SIZE_MAX
  92 #  define SIZE_MAX ((size_t) -1)
  93 # endif
  94
  95 /* The calling program should define program_name and set it to the
  96    name of the executing program.  */
  97 extern char *program_name;
  98
  99 # if HAVE_STRERROR_R || defined strerror_r
 100 #  define __strerror_r strerror_r
 101 # endif
 102 #endif  /* not _LIBC */
 103
 104 static void
 105 print_errno_message (int errnum)
 106 {
 107   char const *s = NULL;
 108
 109 #if defined HAVE_STRERROR_R || _LIBC
 110   char errbuf[1024];
 111 # if STRERROR_R_CHAR_P || _LIBC
 112   s = __strerror_r (errnum, errbuf, sizeof errbuf);
 113 # else
 114   if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
 115     s = errbuf;
 116 # endif
 117 #endif
 118
 119 #if !_LIBC
 120   if (! s && ! (s = strerror (errnum)))
 121     s = _("Unknown system error");
 122 #endif
 123
 124 #if _LIBC
 125   if (_IO_fwide (stderr, 0) > 0)
 126     {
 127       __fwprintf (stderr, L": %s", s);
 128       return;
 129     }
 130 #endif
 131
 132   fprintf (stderr, ": %s", s);
 133 }
 134
 135 static void
 136 error_tail (int status, int errnum, const char *message, va_list args)
 137 {
 138 #if _LIBC
 139   if (_IO_fwide (stderr, 0) > 0)
 140     {
 141 # define ALLOCA_LIMIT 2000
 142       size_t len = strlen (message) + 1;
 143       const wchar_t *wmessage = L"out of memory";
 144       wchar_t *wbuf = (len < ALLOCA_LIMIT
 145                        ? alloca (len * sizeof *wbuf)
 146                        : len <= SIZE_MAX / sizeof *wbuf
 147                        ? malloc (len * sizeof *wbuf)
 148                        : NULL);
 149
 150       if (wbuf)
 151         {
 152           size_t res;
 153           mbstate_t st;
 154           const char *tmp = message;
 155           memset (&st, '\0', sizeof (st));
 156           res = mbsrtowcs (wbuf, &tmp, len, &st);
 157           wmessage = res == (size_t) -1 ? L"???" : wbuf;
 158         }
 159
 160       __vfwprintf (stderr, wmessage, args);
 161       if (! (len < ALLOCA_LIMIT))
 162         free (wbuf);
 163     }
 164   else
 165 #endif
 166     vfprintf (stderr, message, args);
 167   va_end (args);
 168
 169   ++error_message_count;
 170   if (errnum)
 171     print_errno_message (errnum);
 172 #if _LIBC
 173   if (_IO_fwide (stderr, 0) > 0)
 174     putwc (L'\n', stderr);
 175   else
 176 #endif
 177     putc ('\n', stderr);
 178   fflush (stderr);
 179   if (status)
 180     exit (status);
 181 }
 182
 183
 184 /* Print the program name and error message MESSAGE, which is a printf-style
 185    format string with optional args.
 186    If ERRNUM is nonzero, print its corresponding system error message.
 187    Exit with status STATUS if it is nonzero.  */
 188 void
 189 error (int status, int errnum, const char *message, ...)
 190 {
 191   va_list args;
 192
 193 #if defined _LIBC && defined __libc_ptf_call
 194   /* We do not want this call to be cut short by a thread
 195      cancellation.  Therefore disable cancellation for now.  */
 196   int state = PTHREAD_CANCEL_ENABLE;
 197   __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
 198                    0);
 199 #endif
 200
 201   fflush (stdout);
 202 #ifdef _LIBC
 203   _IO_flockfile (stderr);
 204 #endif
 205   if (error_print_progname)
 206     (*error_print_progname) ();
 207   else
 208     {
 209 #if _LIBC
 210       if (_IO_fwide (stderr, 0) > 0)
 211         __fwprintf (stderr, L"%s: ", program_name);
 212       else
 213 #endif
 214         fprintf (stderr, "%s: ", program_name);
 215     }
 216
 217   va_start (args, message);
 218   error_tail (status, errnum, message, args);
 219
 220 #ifdef _LIBC
 221   _IO_funlockfile (stderr);
 222 # ifdef __libc_ptf_call
 223   __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
 224 # endif
 225 #endif
 226 }
 227 \f
 228 /* Sometimes we want to have at most one error per line.  This
 229    variable controls whether this mode is selected or not.  */
 230 int error_one_per_line;
 231
 232 void
 233 error_at_line (int status, int errnum, const char *file_name,
 234                unsigned int line_number, const char *message, ...)
 235 {
 236   va_list args;
 237
 238   if (error_one_per_line)
 239     {
 240       static const char *old_file_name;
 241       static unsigned int old_line_number;
 242
 243       if (old_line_number == line_number
 244           && (file_name == old_file_name
 245               || strcmp (old_file_name, file_name) == 0))
 246         /* Simply return and print nothing.  */
 247         return;
 248
 249       old_file_name = file_name;
 250       old_line_number = line_number;
 251     }
 252
 253 #if defined _LIBC && defined __libc_ptf_call
 254   /* We do not want this call to be cut short by a thread
 255      cancellation.  Therefore disable cancellation for now.  */
 256   int state = PTHREAD_CANCEL_ENABLE;
 257   __libc_ptf_call (pthread_setcancelstate, (PTHREAD_CANCEL_DISABLE, &state),
 258                    0);
 259 #endif
 260
 261   fflush (stdout);
 262 #ifdef _LIBC
 263   _IO_flockfile (stderr);
 264 #endif
 265   if (error_print_progname)
 266     (*error_print_progname) ();
 267   else
 268     {
 269 #if _LIBC
 270       if (_IO_fwide (stderr, 0) > 0)
 271         __fwprintf (stderr, L"%s: ", program_name);
 272       else
 273 #endif
 274         fprintf (stderr, "%s:", program_name);
 275     }
 276
 277   if (file_name != NULL)
 278     {
 279 #if _LIBC
 280       if (_IO_fwide (stderr, 0) > 0)
 281         __fwprintf (stderr, L"%s:%d: ", file_name, line_number);
 282       else
 283 #endif
 284         fprintf (stderr, "%s:%d: ", file_name, line_number);
 285     }
 286
 287   va_start (args, message);
 288   error_tail (status, errnum, message, args);
 289
 290 #ifdef _LIBC
 291   _IO_funlockfile (stderr);
 292 # ifdef __libc_ptf_call
 293   __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
 294 # endif
 295 #endif
 296 }
 297
 298 #ifdef _LIBC
 299 /* Make the weak alias.  */
 300 # undef error
 301 # undef error_at_line
 302 weak_alias (__error, error)
 303 weak_alias (__error_at_line, error_at_line)
 304 #endif