summaryrefslogtreecommitdiff
path: root/lib/error.c
blob: 676ce1d685132f46217969ea4746cc28711da462 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
/* Error handler for noninteractive utilities
   Copyright (C) 1990-2000 Free Software Foundation, Inc.

   This file is part of the GNU C Library.  Its master source is NOT part of
   the C library, however.  The master source lives in /gd/gnu/lib.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* Written by David MacKenzie <djm@gnu.ai.mit.edu>.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <stdio.h>

#if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
# if __STDC__
#  include <stdarg.h>
#  define VA_START(args, lastarg) va_start(args, lastarg)
# else
#  include <varargs.h>
#  define VA_START(args, lastarg) va_start(args)
# endif
#else
# define va_alist a1, a2, a3, a4, a5, a6, a7, a8
# define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
#endif

#if STDC_HEADERS || _LIBC
# include <stdlib.h>
# include <string.h>
#else
void exit ();
#endif

#include "error.h"

#ifndef _
# define _(String) String
#endif

/* If NULL, error will flush stdout, then print on stderr the program
   name, a colon and a space.  Otherwise, error will call this
   function without parameters instead.  */
void (*error_print_progname) (
#if __STDC__ - 0
			      void
#endif
			      );

/* This variable is incremented each time `error' is called.  */
unsigned int error_message_count;

#ifdef _LIBC
/* In the GNU C library, there is a predefined variable for this.  */

# define program_name program_invocation_name
# include <errno.h>

/* In GNU libc we want do not want to use the common name `error' directly.
   Instead make it a weak alias.  */
# define error __error
# define error_at_line __error_at_line

#else /* not _LIBC */

/* The calling program should define program_name and set it to the
   name of the executing program.  */
extern char *program_name;

# ifdef HAVE_STRERROR_R
#  define __strerror_r strerror_r
# else
#  if HAVE_STRERROR
#   ifndef strerror		/* On some systems, strerror is a macro */
char *strerror ();
#   endif
#  else
static char *
private_strerror (errnum)
     int errnum;
{
  extern char *sys_errlist[];
  extern int sys_nerr;

  if (errnum > 0 && errnum <= sys_nerr)
    return _(sys_errlist[errnum]);
  return _("Unknown system error");
}
#   define strerror private_strerror
#  endif /* HAVE_STRERROR */
# endif	/* HAVE_STRERROR_R */
#endif	/* not _LIBC */

/* Print the program name and error message MESSAGE, which is a printf-style
   format string with optional args.
   If ERRNUM is nonzero, print its corresponding system error message.
   Exit with status STATUS if it is nonzero.  */
/* VARARGS */

void
#if defined VA_START && __STDC__
error (int status, int errnum, const char *message, ...)
#else
error (status, errnum, message, va_alist)
     int status;
     int errnum;
     char *message;
     va_dcl
#endif
{
#ifdef VA_START
  va_list args;
#endif

  if (error_print_progname)
    (*error_print_progname) ();
  else
    {
      fflush (stdout);
      fprintf (stderr, "%s: ", program_name);
    }

#ifdef VA_START
  VA_START (args, message);
# if HAVE_VPRINTF || _LIBC
  vfprintf (stderr, message, args);
# else
  _doprnt (message, args, stderr);
# endif
  va_end (args);
#else
  fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
#endif

  ++error_message_count;
  if (errnum)
    {
#if defined HAVE_STRERROR_R || _LIBC
      char errbuf[1024];
# if HAVE_WORKING_STRERROR_R || _LIBC
      fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf));
# else
      /* Don't use __strerror_r's return value because on some systems
	 (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'.  */
      __strerror_r (errnum, errbuf, sizeof errbuf);
      fprintf (stderr, ": %s", errbuf);
# endif
#else
      fprintf (stderr, ": %s", strerror (errnum));
#endif
    }
  putc ('\n', stderr);
  fflush (stderr);
  if (status)
    exit (status);
}

/* Sometimes we want to have at most one error per line.  This
   variable controls whether this mode is selected or not.  */
int error_one_per_line;

void
#if defined VA_START && __STDC__
error_at_line (int status, int errnum, const char *file_name,
	       unsigned int line_number, const char *message, ...)
#else
error_at_line (status, errnum, file_name, line_number, message, va_alist)
     int status;
     int errnum;
     const char *file_name;
     unsigned int line_number;
     char *message;
     va_dcl
#endif
{
#ifdef VA_START
  va_list args;
#endif

  if (error_one_per_line)
    {
      static const char *old_file_name;
      static unsigned int old_line_number;

      if (old_line_number == line_number &&
	  (file_name == old_file_name || !strcmp (old_file_name, file_name)))
	/* Simply return and print nothing.  */
	return;

      old_file_name = file_name;
      old_line_number = line_number;
    }

  if (error_print_progname)
    (*error_print_progname) ();
  else
    {
      fflush (stdout);
      fprintf (stderr, "%s:", program_name);
    }

  if (file_name != NULL)
    fprintf (stderr, "%s:%d: ", file_name, line_number);

#ifdef VA_START
  VA_START (args, message);
# if HAVE_VPRINTF || _LIBC
  vfprintf (stderr, message, args);
# else
  _doprnt (message, args, stderr);
# endif
  va_end (args);
#else
  fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
#endif

  ++error_message_count;
  if (errnum)
    {
#if defined HAVE_STRERROR_R || defined _LIBC
      char errbuf[1024];
# if HAVE_WORKING_STRERROR_R || _LIBC
      fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf));
# else
      /* Don't use __strerror_r's return value because on some systems
	 (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'.  */
      __strerror_r (errnum, errbuf, sizeof errbuf);
      fprintf (stderr, ": %s", errbuf);
# endif
#else
      fprintf (stderr, ": %s", strerror (errnum));
#endif
    }
  putc ('\n', stderr);
  fflush (stderr);
  if (status)
    exit (status);
}

#ifdef _LIBC
/* Make the weak alias.  */
# undef error
# undef error_at_line
weak_alias (__error, error)
weak_alias (__error_at_line, error_at_line)
#endif