1/* Error handler for noninteractive utilities
2   Copyright (C) 1990-1998, 2000 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#if HAVE_LIBINTL_H
30# include <libintl.h>
31#endif
32
33#if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
34# if __STDC__
35#  include <stdarg.h>
36#  define VA_START(args, lastarg) va_start(args, lastarg)
37# else
38#  include <varargs.h>
39#  define VA_START(args, lastarg) va_start(args)
40# endif
41#else
42# define va_alist a1, a2, a3, a4, a5, a6, a7, a8
43# define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
44#endif
45
46#if STDC_HEADERS || _LIBC
47# include <stdlib.h>
48# include <string.h>
49#else
50void exit ();
51#endif
52
53#include "error.h"
54
55#ifndef HAVE_DECL_STRERROR_R
56"this configure-time declaration test was not run"
57#endif
58#if !HAVE_DECL_STRERROR_R
59char *strerror_r ();
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.  */
69void (*error_print_progname) (
70#if __STDC__ - 0
71			      void
72#endif
73			      );
74
75/* This variable is incremented each time `error' is called.  */
76unsigned 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
84/* In GNU libc we want do not want to use the common name `error' directly.
85   Instead make it a weak alias.  */
86# define error __error
87# define error_at_line __error_at_line
88
89# ifdef USE_IN_LIBIO
90#  include <libio/iolibio.h>
91#  define fflush(s) _IO_fflush (s)
92# endif
93
94#else /* not _LIBC */
95
96/* The calling program should define program_name and set it to the
97   name of the executing program.  */
98extern char *program_name;
99
100# ifdef HAVE_STRERROR_R
101#  define __strerror_r strerror_r
102# else
103#  if HAVE_STRERROR
104#   ifndef strerror		/* On some systems, strerror is a macro */
105char *strerror ();
106#   endif
107#  else
108static char *
109private_strerror (errnum)
110     int errnum;
111{
112  extern char *sys_errlist[];
113  extern int sys_nerr;
114
115  if (errnum > 0 && errnum <= sys_nerr)
116    return _(sys_errlist[errnum]);
117  return _("Unknown system error");
118}
119#   define strerror private_strerror
120#  endif /* HAVE_STRERROR */
121# endif	/* HAVE_STRERROR_R */
122#endif	/* not _LIBC */
123
124/* Print the program name and error message MESSAGE, which is a printf-style
125   format string with optional args.
126   If ERRNUM is nonzero, print its corresponding system error message.
127   Exit with status STATUS if it is nonzero.  */
128/* VARARGS */
129
130void
131#if defined VA_START && __STDC__
132error (int status, int errnum, const char *message, ...)
133#else
134error (status, errnum, message, va_alist)
135     int status;
136     int errnum;
137     char *message;
138     va_dcl
139#endif
140{
141#ifdef VA_START
142  va_list args;
143#endif
144
145  if (error_print_progname)
146    (*error_print_progname) ();
147  else
148    {
149      fflush (stdout);
150      fprintf (stderr, "%s: ", program_name);
151    }
152
153#ifdef VA_START
154  VA_START (args, message);
155# if HAVE_VPRINTF || _LIBC
156  vfprintf (stderr, message, args);
157# else
158  _doprnt (message, args, stderr);
159# endif
160  va_end (args);
161#else
162  fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
163#endif
164
165  ++error_message_count;
166  if (errnum)
167    {
168#if defined HAVE_STRERROR_R || _LIBC
169      char errbuf[1024];
170# if HAVE_WORKING_STRERROR_R || _LIBC
171      fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf));
172# else
173      /* Don't use __strerror_r's return value because on some systems
174	 (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'.  */
175      __strerror_r (errnum, errbuf, sizeof errbuf);
176      fprintf (stderr, ": %s", errbuf);
177# endif
178#else
179      fprintf (stderr, ": %s", strerror (errnum));
180#endif
181    }
182  putc ('\n', stderr);
183  fflush (stderr);
184  if (status)
185    exit (status);
186}
187
188/* Sometimes we want to have at most one error per line.  This
189   variable controls whether this mode is selected or not.  */
190int error_one_per_line;
191
192void
193#if defined VA_START && __STDC__
194error_at_line (int status, int errnum, const char *file_name,
195	       unsigned int line_number, const char *message, ...)
196#else
197error_at_line (status, errnum, file_name, line_number, message, va_alist)
198     int status;
199     int errnum;
200     const char *file_name;
201     unsigned int line_number;
202     char *message;
203     va_dcl
204#endif
205{
206#ifdef VA_START
207  va_list args;
208#endif
209
210  if (error_one_per_line)
211    {
212      static const char *old_file_name;
213      static unsigned int old_line_number;
214
215      if (old_line_number == line_number &&
216	  (file_name == old_file_name || !strcmp (old_file_name, file_name)))
217	/* Simply return and print nothing.  */
218	return;
219
220      old_file_name = file_name;
221      old_line_number = line_number;
222    }
223
224  if (error_print_progname)
225    (*error_print_progname) ();
226  else
227    {
228      fflush (stdout);
229      fprintf (stderr, "%s:", program_name);
230    }
231
232  if (file_name != NULL)
233    fprintf (stderr, "%s:%d: ", file_name, line_number);
234
235#ifdef VA_START
236  VA_START (args, message);
237# if HAVE_VPRINTF || _LIBC
238  vfprintf (stderr, message, args);
239# else
240  _doprnt (message, args, stderr);
241# endif
242  va_end (args);
243#else
244  fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
245#endif
246
247  ++error_message_count;
248  if (errnum)
249    {
250#if defined HAVE_STRERROR_R || _LIBC
251      char errbuf[1024];
252# if HAVE_WORKING_STRERROR_R || _LIBC
253      fprintf (stderr, ": %s", __strerror_r (errnum, errbuf, sizeof errbuf));
254# else
255      /* Don't use __strerror_r's return value because on some systems
256	 (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'.  */
257      __strerror_r (errnum, errbuf, sizeof errbuf);
258      fprintf (stderr, ": %s", errbuf);
259# endif
260#else
261      fprintf (stderr, ": %s", strerror (errnum));
262#endif
263    }
264  putc ('\n', stderr);
265  fflush (stderr);
266  if (status)
267    exit (status);
268}
269
270#ifdef _LIBC
271/* Make the weak alias.  */
272# undef error
273# undef error_at_line
274weak_alias (__error, error)
275weak_alias (__error_at_line, error_at_line)
276#endif
277