1: /* error.c -- error handler for noninteractive utilities
2: Copyright (C) 1990, 91, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
3:
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.
8:
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.
13:
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
17:
18: /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
19:
20: #ifdef HAVE_CONFIG_H
21: # include <config.h>
22: #endif
23:
24: #include <stdio.h>
25:
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
38:
39: #if STDC_HEADERS || _LIBC
40: # include <stdlib.h>
41: # include <string.h>
42: #else
43: void exit ();
44: #endif
45:
46: #ifndef _
47: # define _(String) String
48: #endif
49:
50: /* If NULL, error will flush stdout, then print on stderr the program
51: name, a colon and a space. Otherwise, error will call this
52: function without parameters instead. */
53: void (*error_print_progname) (
54: #if __STDC__ - 0
55: void
56: #endif
57: );
58:
59: /* This variable is incremented each time `error' is called. */
60: unsigned int error_message_count;
61:
62: #ifdef _LIBC
63: /* In the GNU C library, there is a predefined variable for this. */
64:
65: # define program_name program_invocation_name
66: # include <errno.h>
67:
68: #else
69:
70: /* The calling program should define program_name and set it to the
71: name of the executing program. */
72: extern char *program_name;
73:
74: # if HAVE_STRERROR
75: # ifndef strerror /* On some systems, strerror is a macro */
76: char *strerror ();
77: # endif
78: # else
79: static char *
80: private_strerror (errnum)
81: int errnum;
82: {
83: extern char *sys_errlist[];
84: extern int sys_nerr;
85:
86: if (errnum > 0 && errnum <= sys_nerr)
87: return sys_errlist[errnum];
88: return _("Unknown system error");
89: }
90: # define strerror private_strerror
91: # endif /* HAVE_STRERROR */
92: #endif /* _LIBC */
93:
94: /* Print the program name and error message MESSAGE, which is a printf-style
95: format string with optional args.
96: If ERRNUM is nonzero, print its corresponding system error message.
97: Exit with status STATUS if it is nonzero. */
98: /* VARARGS */
99:
100: void
101: #if defined(VA_START) && __STDC__
102: error (int status, int errnum, const char *message, ...)
103: #else
104: error (status, errnum, message, va_alist)
105: int status;
106: int errnum;
107: char *message;
108: va_dcl
109: #endif
110: {
111: #ifdef VA_START
112: va_list args;
113: #endif
114:
115: if (error_print_progname)
116: (*error_print_progname) ();
117: else
118: {
119: fflush (stdout);
120: fprintf (stderr, "%s: ", program_name);
121: }
122:
123: #ifdef VA_START
124: VA_START (args, message);
125: # if HAVE_VPRINTF || _LIBC
126: vfprintf (stderr, message, args);
127: # else
128: _doprnt (message, args, stderr);
129: # endif
130: va_end (args);
131: #else
132: fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
133: #endif
134:
135: ++error_message_count;
136: if (errnum)
137: fprintf (stderr, ": %s", strerror (errnum));
138: putc ('\n', stderr);
139: fflush (stderr);
140: if (status)
141: exit (status);
142: }
143:
144: /* Sometimes we want to have at most one error per line. This
145: variable controls whether this mode is selected or not. */
146: int error_one_per_line;
147:
148: void
149: #if defined(VA_START) && __STDC__
150: error_at_line (int status, int errnum, const char *file_name,
151: unsigned int line_number, const char *message, ...)
152: #else
153: error_at_line (status, errnum, file_name, line_number, message, va_alist)
154: int status;
155: int errnum;
156: const char *file_name;
157: unsigned int line_number;
158: char *message;
159: va_dcl
160: #endif
161: {
162: #ifdef VA_START
163: va_list args;
164: #endif
165:
166: if (error_one_per_line)
167: {
168: static const char *old_file_name;
169: static unsigned int old_line_number;
170:
171: if (old_line_number == line_number &&
172: (file_name == old_file_name || !strcmp (old_file_name, file_name)))
173: /* Simply return and print nothing. */
174: return;
175:
176: old_file_name = file_name;
177: old_line_number = line_number;
178: }
179:
180: if (error_print_progname)
181: (*error_print_progname) ();
182: else
183: {
184: fflush (stdout);
185: fprintf (stderr, "%s:", program_name);
186: }
187:
188: if (file_name != NULL)
189: fprintf (stderr, "%s:%d: ", file_name, line_number);
190:
191: #ifdef VA_START
192: VA_START (args, message);
193: # if HAVE_VPRINTF || _LIBC
194: vfprintf (stderr, message, args);
195: # else
196: _doprnt (message, args, stderr);
197: # endif
198: va_end (args);
199: #else
200: fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8);
201: #endif
202:
203: ++error_message_count;
204: if (errnum)
205: fprintf (stderr, ": %s", strerror (errnum));
206: putc ('\n', stderr);
207: fflush (stderr);
208: if (status)
209: exit (status);
210: }
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