MFC r1.5 r1.49 r1.40 (HEAD):
[dragonfly.git] / contrib / cpio / error.c
bloba36198b6b6e89a40b93d1e5b45ccec1a8baf2b88
1 /* error.c -- error handler for noninteractive utilities
2 Copyright (C) 1990, 91, 92, 93, 94, 95 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
24 #include <stdio.h>
26 #if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC
27 # if __STDC__
28 # include <stdarg.h>
29 # define VA_START(args, lastarg) va_start(args, lastarg)
30 # else
31 # include <varargs.h>
32 # define VA_START(args, lastarg) va_start(args)
33 # endif
34 #else
35 # define va_alist a1, a2, a3, a4, a5, a6, a7, a8
36 # define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
37 #endif
39 #if STDC_HEADERS || _LIBC
40 # include <stdlib.h>
41 # include <string.h>
42 #else
43 void exit ();
44 #endif
46 /* This variable is incremented each time `error' is called. */
47 unsigned int error_message_count;
49 /* If NULL, error will flush stdout, then print on stderr the program
50 name, a colon and a space. Otherwise, error will call this
51 function without parameters instead. */
52 void (*error_print_progname) () = NULL;
54 #ifdef _LIBC
55 #define program_name program_invocation_name
56 #endif
58 /* The calling program should define program_name and set it to the
59 name of the executing program. */
60 extern char *program_name;
62 #if HAVE_STRERROR || _LIBC
63 # ifndef strerror /* On some systems, strerror is a macro */
64 char *strerror ();
65 # endif
66 #else
67 static char *
68 private_strerror (errnum)
69 int errnum;
71 extern char *sys_errlist[];
72 extern int sys_nerr;
74 if (errnum > 0 && errnum <= sys_nerr)
75 return sys_errlist[errnum];
76 return "Unknown system error";
78 #define strerror private_strerror
79 #endif
81 /* Print the program name and error message MESSAGE, which is a printf-style
82 format string with optional args.
83 If ERRNUM is nonzero, print its corresponding system error message.
84 Exit with status STATUS if it is nonzero. */
85 /* VARARGS */
87 void
88 #if defined(VA_START) && __STDC__
89 error (int status, int errnum, const char *message, ...)
90 #else
91 error (status, errnum, message, va_alist)
92 int status;
93 int errnum;
94 char *message;
95 va_dcl
96 #endif
98 #ifdef VA_START
99 va_list args;
100 #endif
102 if (error_print_progname)
103 (*error_print_progname) ();
104 else
106 fflush (stdout);
107 fprintf (stderr, "%s: ", program_name);
110 #ifdef VA_START
111 VA_START (args, message);
112 # if HAVE_VPRINTF || _LIBC
113 vfprintf (stderr, message, args);
114 # else
115 _doprnt (message, args, stderr);
116 # endif
117 va_end (args);
118 #else
119 fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
120 #endif
122 ++error_message_count;
124 if (errnum)
125 fprintf (stderr, ": %s", strerror (errnum));
126 putc ('\n', stderr);
127 fflush (stderr);
128 if (status)
129 exit (status);