1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <error.h>
30
31 #include <errno.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 unsigned int error_message_count = 0;
37 void (*error_print_progname)(void) = nullptr;
38 int error_one_per_line = 0;
39
__error_head()40 static void __error_head() {
41 ++error_message_count;
42
43 if (error_print_progname != nullptr) {
44 error_print_progname();
45 } else {
46 fflush(stdout);
47 fprintf(stderr, "%s:", getprogname());
48 }
49 }
50
__error_tail(int status,int error)51 static void __error_tail(int status, int error) {
52 if (error != 0) {
53 fprintf(stderr, ": %s", strerror(error));
54 }
55
56 putc('\n', stderr);
57 fflush(stderr);
58
59 if (status != 0) {
60 exit(status);
61 }
62 }
63
error(int status,int error,const char * fmt,...)64 void error(int status, int error, const char* fmt, ...) {
65 __error_head();
66 putc(' ', stderr);
67
68 va_list ap;
69 va_start(ap, fmt);
70 vfprintf(stderr, fmt, ap);
71 va_end(ap);
72
73 __error_tail(status, error);
74 }
75
error_at_line(int status,int error,const char * file,unsigned int line,const char * fmt,...)76 void error_at_line(int status, int error, const char* file, unsigned int line, const char* fmt, ...) {
77 if (error_one_per_line) {
78 static const char* last_file;
79 static unsigned int last_line;
80 if (last_line == line && last_file != nullptr && strcmp(last_file, file) == 0) {
81 return;
82 }
83 last_file = file;
84 last_line = line;
85 }
86
87 __error_head();
88 fprintf(stderr, "%s:%d: ", file, line);
89
90 va_list ap;
91 va_start(ap, fmt);
92 vfprintf(stderr, fmt, ap);
93 va_end(ap);
94
95 __error_tail(status, error);
96 }
97