* xargs/Makefile.am: add ansi2knr
[findutils.git] / lib / error.c
blob53b650c57837e1bc17e13b084e371d52974903d1
1 /* Error handler for noninteractive utilities
2 Copyright (C) 1990,91,92,93,94,95,96,97,98, 99 Free Software Foundation, Inc.
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.
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.
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.
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. */
22 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
24 #ifdef HAVE_CONFIG_H
25 # include <config.h>
26 #endif
28 #include <stdio.h>
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
43 #if STDC_HEADERS || _LIBC
44 # include <stdlib.h>
45 # include <string.h>
46 #else
47 void exit ();
48 #endif
50 #include "error.h"
52 #ifndef _
53 # define _(String) String
54 #endif
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
65 /* This variable is incremented each time `error' is called. */
66 unsigned int error_message_count;
68 #ifdef _LIBC
69 /* In the GNU C library, there is a predefined variable for this. */
71 # define program_name program_invocation_name
72 # include <errno.h>
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
79 #else /* not _LIBC */
81 /* The calling program should define program_name and set it to the
82 name of the executing program. */
83 extern char *program_name;
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 */
90 char *strerror ();
91 # endif
92 # else
93 static char *
94 private_strerror (errnum)
95 int errnum;
97 extern char *sys_errlist[];
98 extern int sys_nerr;
100 if (errnum > 0 && errnum <= sys_nerr)
101 return _(sys_errlist[errnum]);
102 return _("Unknown system error");
104 # define strerror private_strerror
105 # endif /* HAVE_STRERROR */
106 # endif /* HAVE_STRERROR_R */
107 #endif /* not _LIBC */
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 */
115 void
116 #if defined VA_START && __STDC__
117 error (int status, int errnum, const char *message, ...)
118 #else
119 error (status, errnum, message, va_alist)
120 int status;
121 int errnum;
122 char *message;
123 va_dcl
124 #endif
126 #ifdef VA_START
127 va_list args;
128 #endif
130 if (error_print_progname)
131 (*error_print_progname) ();
132 else
134 fflush (stdout);
135 fprintf (stderr, "%s: ", program_name);
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
150 ++error_message_count;
151 if (errnum)
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
163 putc ('\n', stderr);
164 fflush (stderr);
165 if (status)
166 exit (status);
169 /* Sometimes we want to have at most one error per line. This
170 variable controls whether this mode is selected or not. */
171 int error_one_per_line;
173 void
174 #if defined VA_START && __STDC__
175 error_at_line (int status, int errnum, const char *file_name,
176 unsigned int line_number, const char *message, ...)
177 #else
178 error_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
187 #ifdef VA_START
188 va_list args;
189 #endif
191 if (error_one_per_line)
193 static const char *old_file_name;
194 static unsigned int old_line_number;
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;
201 old_file_name = file_name;
202 old_line_number = line_number;
205 if (error_print_progname)
206 (*error_print_progname) ();
207 else
209 fflush (stdout);
210 fprintf (stderr, "%s:", program_name);
213 if (file_name != NULL)
214 fprintf (stderr, "%s:%d: ", file_name, line_number);
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
228 ++error_message_count;
229 if (errnum)
231 #if defined HAVE_STRERROR_R || defined _LIBC
232 char errbuf[1024];
233 /* Don't use __strerror_r's return value because on some systems
234 (at least DEC UNIX 4.0[A-D]) strerror_r returns `int'. */
235 __strerror_r (errnum, errbuf, sizeof errbuf);
236 fprintf (stderr, ": %s", errbuf);
237 #else
238 fprintf (stderr, ": %s", strerror (errnum));
239 #endif
241 putc ('\n', stderr);
242 fflush (stderr);
243 if (status)
244 exit (status);
247 #ifdef _LIBC
248 /* Make the weak alias. */
249 # undef error
250 # undef error_at_line
251 weak_alias (__error, error)
252 weak_alias (__error_at_line, error_at_line)
253 #endif