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 <[email protected]>. */
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
50 void 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
59 char *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. */
69 void (*error_print_progname) (
70 #if __STDC__ - 0
71 void
72 #endif
73 );
74
75 /* This variable is incremented each time `error' is called. */
76 unsigned 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. */
98 extern 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 */
105 char *strerror ();
106 # endif
107 # else
108 static char *
private_strerror(errnum)109 private_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
130 void
131 #if defined VA_START && __STDC__
error(int status,int errnum,const char * message,...)132 error (int status, int errnum, const char *message, ...)
133 #else
134 error (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. */
190 int error_one_per_line;
191
192 void
193 #if defined VA_START && __STDC__
error_at_line(int status,int errnum,const char * file_name,unsigned int line_number,const char * message,...)194 error_at_line (int status, int errnum, const char *file_name,
195 unsigned int line_number, const char *message, ...)
196 #else
197 error_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
274 weak_alias (__error, error)
275 weak_alias (__error_at_line, error_at_line)
276 #endif
277