1 /* Error handler for noninteractive utilities
2 Copyright (C) 1990,91,92,93,94,95,96,97,98, 99 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
47 void 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. */
59 void (*error_print_progname) (
60 #if __STDC__ - 0
61 void
62 #endif
63 );
64
65 /* This variable is incremented each time `error' is called. */
66 unsigned 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. */
83 # ifdef __FreeBSD__
84 extern char *__progname;
85 # define program_name __progname
86 # else
87 extern char *program_name;
88 # endif
89
90 # ifdef HAVE_STRERROR_R
91 # define __strerror_r strerror_r
92 # else
93 # if HAVE_STRERROR
94 # ifndef strerror /* On some systems, strerror is a macro */
95 char *strerror ();
96 # endif
97 # else
98 static char *
private_strerror(errnum)99 private_strerror (errnum)
100 int errnum;
101 {
102 extern char *sys_errlist[];
103 extern int sys_nerr;
104
105 if (errnum > 0 && errnum <= sys_nerr)
106 return _(sys_errlist[errnum]);
107 return _("Unknown system error");
108 }
109 # define strerror private_strerror
110 # endif /* HAVE_STRERROR */
111 # endif /* HAVE_STRERROR_R */
112 #endif /* not _LIBC */
113
114 /* Print the program name and error message MESSAGE, which is a printf-style
115 format string with optional args.
116 If ERRNUM is nonzero, print its corresponding system error message.
117 Exit with status STATUS if it is nonzero. */
118 /* VARARGS */
119
120 void
121 #if defined VA_START && __STDC__
error(int status,int errnum,const char * message,...)122 error (int status, int errnum, const char *message, ...)
123 #else
124 error (status, errnum, message, va_alist)
125 int status;
126 int errnum;
127 char *message;
128 va_dcl
129 #endif
130 {
131 #ifdef VA_START
132 va_list args;
133 #endif
134
135 if (error_print_progname)
136 (*error_print_progname) ();
137 else
138 {
139 fflush (stdout);
140 fprintf (stderr, "%s: ", program_name);
141 }
142
143 #ifdef VA_START
144 VA_START (args, message);
145 # if HAVE_VPRINTF || _LIBC
146 vfprintf (stderr, message, args);
147 # else
148 _doprnt (message, args, stderr);
149 # endif
150 va_end (args);
151 #else
152 fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
153 #endif
154
155 ++error_message_count;
156 if (errnum)
157 {
158 #if defined HAVE_STRERROR_R || defined _LIBC
159 char errbuf[1024];
160 /* Don't use __strerror_r's return value because on some systems
161 (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'. */
162 __strerror_r (errnum, errbuf, sizeof errbuf);
163 fprintf (stderr, ": %s", errbuf);
164 #else
165 fprintf (stderr, ": %s", strerror (errnum));
166 #endif
167 }
168 putc ('\n', stderr);
169 fflush (stderr);
170 if (status)
171 exit (status);
172 }
173
174 /* Sometimes we want to have at most one error per line. This
175 variable controls whether this mode is selected or not. */
176 int error_one_per_line;
177
178 void
179 #if defined VA_START && __STDC__
error_at_line(int status,int errnum,const char * file_name,unsigned int line_number,const char * message,...)180 error_at_line (int status, int errnum, const char *file_name,
181 unsigned int line_number, const char *message, ...)
182 #else
183 error_at_line (status, errnum, file_name, line_number, message, va_alist)
184 int status;
185 int errnum;
186 const char *file_name;
187 unsigned int line_number;
188 char *message;
189 va_dcl
190 #endif
191 {
192 #ifdef VA_START
193 va_list args;
194 #endif
195
196 if (error_one_per_line)
197 {
198 static const char *old_file_name;
199 static unsigned int old_line_number;
200
201 if (old_line_number == line_number &&
202 (file_name == old_file_name || !strcmp (old_file_name, file_name)))
203 /* Simply return and print nothing. */
204 return;
205
206 old_file_name = file_name;
207 old_line_number = line_number;
208 }
209
210 if (error_print_progname)
211 (*error_print_progname) ();
212 else
213 {
214 fflush (stdout);
215 fprintf (stderr, "%s:", program_name);
216 }
217
218 if (file_name != NULL)
219 fprintf (stderr, "%s:%d: ", file_name, line_number);
220
221 #ifdef VA_START
222 VA_START (args, message);
223 # if HAVE_VPRINTF || _LIBC
224 vfprintf (stderr, message, args);
225 # else
226 _doprnt (message, args, stderr);
227 # endif
228 va_end (args);
229 #else
230 fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
231 #endif
232
233 ++error_message_count;
234 if (errnum)
235 {
236 #if defined HAVE_STRERROR_R || defined _LIBC
237 char errbuf[1024];
238 /* Don't use __strerror_r's return value because on some systems
239 (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'. */
240 __strerror_r (errnum, errbuf, sizeof errbuf);
241 fprintf (stderr, ": %s", errbuf);
242 #else
243 fprintf (stderr, ": %s", strerror (errnum));
244 #endif
245 }
246 putc ('\n', stderr);
247 fflush (stderr);
248 if (status)
249 exit (status);
250 }
251
252 #ifdef _LIBC
253 /* Make the weak alias. */
254 # undef error
255 # undef error_at_line
256 weak_alias (__error, error)
257 weak_alias (__error_at_line, error_at_line)
258 #endif
259