gnu/dist/diffutils/lib/error.c

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