1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <error.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <stddef.h>
/**
* Print an error message with a detailed description, and optionally exit.
*
* This is a GNU extension.
*
* @param status The process will exit, with the function returning, with this
* exit status, unless it is zero. If zero, the process shall not exit.
* @param errnum The value of `errno` when the error occurred, zero if the a textual
* description of the error, further than that of `format`, shall not
* be printed.
* @param format Formatting-string for a detailed description of what happend.
* @param args Formatting-arguments for `format`.
*/
void error(int status, int errnum, const char* format, ...)
{
va_list args;
va_start(args, format);
verror_at_line(status, errnum, NULL, 0, format, args);
va_end(args);
}
/**
* Variant of `error` that uses `va_list` instead of variadic arguments.
*
* This is a slibc extension to the GNU extension `error`.
*
* @param status The process will exit, with the function returning, with this
* exit status, unless it is zero. If zero, the process shall not exit.
* @param errnum The value of `errno` when the error occurred, zero if the a textual
* description of the error, further than that of `format`, shall not
* be printed.
* @param format Formatting-string for a detailed description of what happend.
* @param args Formatting-arguments for `format`.
*/
void verror(int status, int errnum, const char* format, va_list args)
{
verror_at_line(status, errnum, NULL, 0, format, args);
}
/**
* Variant of `error` that prints the filename and the line
* number whence the error occurred.
*
* This is a GNU extension.
*
* @param status The process will exit, with the function returning, with this
* exit status, unless it is zero. If zero, the process shall not exit.
* @param errnum The value of `errno` when the error occurred, zero if the a textual
* description of the error, further than that of `format`, shall not
* be printed.
* @param filename The filename of the source code file where the error occurred.
* @param linenum The line number of in the source code file where the error occurred.
* @param format Formatting-string for a detailed description of what happend.
* @param args Formatting-arguments for `format`.
*/
void error_at_line(int status, int errnum, const char* filename,
unsigned int linenum, const char* format, ...)
{
va_list args;
va_start(args, format);
verror_at_line(status, errnu, filename, linenum, format, args);
va_end(args);
}
/**
* Variant of `verror` that prints the filename and the line
* number whence the error occurred.
*
* This is a slibc extension to the GNU extension `error_at_line`.
*
* @param status The process will exit, with the function returning, with this
* exit status, unless it is zero. If zero, the process shall not exit.
* @param errnum The value of `errno` when the error occurred, zero if the a textual
* description of the error, further than that of `format`, shall not
* be printed.
* @param filename The filename of the source code file where the error occurred.
* @param linenum The line number of in the source code file where the error occurred.
* @param format Formatting-string for a detailed description of what happend.
* @param args Formatting-arguments for `format`.
*/
void verror_at_line(int status, int errnum, const char* filename,
unsigned int linenum, const char* format, va_list args)
{
int tty = isatty(STDERR_FILENO);
void (*pname)(void) = error_print_progname;
static const char* last_filename = NULL;
static unsigned int last_linenum = 0;
static int last_errnum = 0;
if (error_one_per_line)
if ((last_filename == filename) && (last_linenum == linenum) && (last_errnum == errnum))
goto skip_print;
if (pname != NULL)
pname();
else
{
fflush(stdout);
fprintf(stderr, "%(\033[0;1;31m)%s%(\033[0m)",
tty, program_invocation_name, tty);
}
fprintf(stderr, "%(: %(\033[35m%)%s%(\033[0m%): %(\033[32m%)%u%(\033[0m%)%)%(: %s%)%(: %)",
filename != NULL, tty, filename, tty, tty, filenum, tty,
errnum != 0, strerror(errnum) /* TODO strerror is not MT-Safe */, format != NULL);
if (filename != NULL)
last_filename = filename, last_linenum = linenum, last_errnum = errnum;
vfprintf(stderr, format, args);
fprintf(stderr, "\n", program_invocation_name);
fflush(stderr);
skip_print:
error_message_count++; /* TODO lock around this */
if (status)
exit(status);
}
/**
* Counts the number of times `error` ( verror`) and
* `error_at_line` (`verror_at_line`) has returned.
* This variable is global and shared by all threads.
*
* This is a GNU extension.
*/
volatile unsigned int error_message_count = 0;
/**
* If set to non-zero (the default), `error_at_line`
* and `verror_at_line` restrict themself to only
* print an error the first time it appears. This
* is determined by the uniqueness of the combination
* of the values on `filename` and `linenum`. However
* it will forget the line the next time the function
* is called from a different line. This variable is
* global and shared by all threads. Has a slibc
* modification, `errnum` is also remembered, meaning
* if the error code is different (zero is considered
* an error code), the error is printed even if it
* occurred on the same line as the last time.
*
* This is a GNU extension.
*/
volatile int error_one_per_line = 1;
/**
* If not `NULL`, this function is used instead of
* flushing stdout and printing the process name to
* stderr, by `error` (`verror`) and `verror_at_line`
* (`verror_at_line`). This variable is global and
* shared by all threads.
*
* This is a GNU extension.
*/
volatile void (*error_print_progname)(void) = NULL;
|
