1/* Error handler for noninteractive utilities
2   Copyright (C) 1990,91,92,93,94,95,96,97,98 Free Software Foundation, Inc.
3
4   This file is part of the GNU C Library.  Its master source is NOT part of
5   the C library, however.  The master source lives in /gd/gnu/lib.
6
7   The GNU C Library is free software; you can redistribute it and/or
8   modify it under the terms of the GNU Library General Public License as
9   published by the Free Software Foundation; either version 2 of the
10   License, or (at your option) any later version.
11
12   The GNU C Library is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15   Library General Public License for more details.
16
17   You should have received a copy of the GNU Library General Public
18   License along with the GNU C Library; see the file COPYING.LIB.  If not,
19   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20   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
30#if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
31# if __STDC__
32#  include <stdarg.h>
33#  define VA_START(args, lastarg) va_start(args, lastarg)
34# else
35#  include <varargs.h>
36#  define VA_START(args, lastarg) va_start(args)
37# endif
38#else
39# define va_alist a1, a2, a3, a4, a5, a6, a7, a8
40# define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
41#endif
42
43#if STDC_HEADERS || _LIBC
44# include <stdlib.h>
45# include <string.h>
46#else
47void exit ();
48#endif
49
50#include "error.h"
51
52#ifndef _
53# define _(String) String
54#endif
55
56/* If NULL, error will flush stdout, then print on stderr the program
57   name, a colon and a space.  Otherwise, error will call this
58   function without parameters instead.  */
59void (*error_print_progname) (
60#if __STDC__ - 0
61			      void
62#endif
63			      );
64
65/* This variable is incremented each time `error' is called.  */
66unsigned int error_message_count;
67
68#ifdef _LIBC
69/* In the GNU C library, there is a predefined variable for this.  */
70
71# define program_name program_invocation_name
72# include <errno.h>
73
74/* In GNU libc we want do not want to use the common name `error' directly.
75   Instead make it a weak alias.  */
76# define error __error
77# define error_at_line __error_at_line
78
79#else /* not _LIBC */
80
81/* The calling program should define program_name and set it to the
82   name of the executing program.  */
83extern char *program_name;
84
85# ifdef HAVE_STRERROR_R
86#  define __strerror_r strerror_r
87# else
88#  if HAVE_STRERROR
89#   ifndef strerror		/* On some systems, strerror is a macro */
90char *strerror ();
91#   endif
92#  else
93static char *
94private_strerror (errnum)
95     int errnum;
96{
97  extern char *sys_errlist[];
98  extern int sys_nerr;
99
100  if (errnum > 0 && errnum <= sys_nerr)
101    return _(sys_errlist[errnum]);
102  return _("Unknown system error");
103}
104#   define strerror private_strerror
105#  endif /* HAVE_STRERROR */
106# endif	/* HAVE_STRERROR_R */
107#endif	/* not _LIBC */
108
109/* Print the program name and error message MESSAGE, which is a printf-style
110   format string with optional args.
111   If ERRNUM is nonzero, print its corresponding system error message.
112   Exit with status STATUS if it is nonzero.  */
113/* VARARGS */
114
115void
116#if defined VA_START && __STDC__
117error (int status, int errnum, const char *message, ...)
118#else
119error (status, errnum, message, va_alist)
120     int status;
121     int errnum;
122     char *message;
123     va_dcl
124#endif
125{
126#ifdef VA_START
127  va_list args;
128#endif
129
130  if (error_print_progname)
131    (*error_print_progname) ();
132  else
133    {
134      fflush (stdout);
135      fprintf (stderr, "%s: ", program_name);
136    }
137
138#ifdef VA_START
139  VA_START (args, message);
140# if HAVE_VPRINTF || _LIBC
141  vfprintf (stderr, message, args);
142# else
143  _doprnt (message, args, stderr);
144# endif
145  va_end (args);
146#else
147  fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
148#endif
149
150  ++error_message_count;
151  if (errnum)
152    {
153#if defined HAVE_STRERROR_R || defined _LIBC
154      char errbuf[1024];
155      /* Don't use __strerror_r's return value because on some systems
156	 (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'.  */
157      __strerror_r (errnum, errbuf, sizeof errbuf);
158      fprintf (stderr, ": %s", errbuf);
159#else
160      fprintf (stderr, ": %s", strerror (errnum));
161#endif
162    }
163  putc ('\n', stderr);
164  fflush (stderr);
165  if (status)
166    exit (status);
167}
168
169/* Sometimes we want to have at most one error per line.  This
170   variable controls whether this mode is selected or not.  */
171int error_one_per_line;
172
173void
174#if defined VA_START && __STDC__
175error_at_line (int status, int errnum, const char *file_name,
176	       unsigned int line_number, const char *message, ...)
177#else
178error_at_line (status, errnum, file_name, line_number, message, va_alist)
179     int status;
180     int errnum;
181     const char *file_name;
182     unsigned int line_number;
183     char *message;
184     va_dcl
185#endif
186{
187#ifdef VA_START
188  va_list args;
189#endif
190
191  if (error_one_per_line)
192    {
193      static const char *old_file_name;
194      static unsigned int old_line_number;
195
196      if (old_line_number == line_number &&
197	  (file_name == old_file_name || !strcmp (old_file_name, file_name)))
198	/* Simply return and print nothing.  */
199	return;
200
201      old_file_name = file_name;
202      old_line_number = line_number;
203    }
204
205  if (error_print_progname)
206    (*error_print_progname) ();
207  else
208    {
209      fflush (stdout);
210      fprintf (stderr, "%s:", program_name);
211    }
212
213  if (file_name != NULL)
214    fprintf (stderr, "%s:%d: ", file_name, line_number);
215
216#ifdef VA_START
217  VA_START (args, message);
218# if HAVE_VPRINTF || _LIBC
219  vfprintf (stderr, message, args);
220# else
221  _doprnt (message, args, stderr);
222# endif
223  va_end (args);
224#else
225  fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
226#endif
227
228  ++error_message_count;
229  if (errnum)
230    {
231#if defined HAVE_STRERROR_R || defined _LIBC
232      char errbuf[1024];
233      fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf));
234#else
235      fprintf (stderr, ": %s", strerror (errnum));
236#endif
237    }
238  putc ('\n', stderr);
239  fflush (stderr);
240  if (status)
241    exit (status);
242}
243
244#ifdef _LIBC
245/* Make the weak alias.  */
246# undef error
247# undef error_at_line
248weak_alias (__error, error)
249weak_alias (__error_at_line, error_at_line)
250#endif
251