tlog.c - ics2txt - convert icalendar .ics file to plain text
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tlog.c (1353B)
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1 #include "log.h"
2
3 #include <assert.h>
4 #include <string.h>
5
6 /*
7 * log.c - log to standard error according to the log level
8 *
9 * Instead of logging to syslog, delegate logging to a separate
10 * tool, such as FreeBSD's daemon(8), POSIX's logger(1).
11 */
12
13 #include <errno.h>
14 #include <stdio.h>
15 #include <stdlib.h>
16
17 #define LOG_DEFAULT 3 /* info */
18
19 int log_level = -1;
20 char *log_arg0 = NULL;
21
22 void
23 vlogf(int level, char const *flag, char const *fmt, va_list va)
24 {
25 char *env;
26 int e = errno;
27
28 if (log_level < 0) {
29 env = getenv("LOG");
30 log_level = (env == NULL ? 0 : atoi(env));
31 log_level = (log_level > 0 ? log_level : LOG_DEFAULT);
32 }
33
34 if (log_level < level)
35 return;
36
37 if (log_arg0 != NULL)
38 fprintf(stderr, "%s: ", log_arg0);
39
40 fprintf(stderr, "%s: ", flag);
41 vfprintf(stderr, fmt, va);
42
43 if (e != 0)
44 fprintf(stderr, ": %s", strerror(e));
45
46 fprintf(stderr, "\n");
47 fflush(stderr);
48 }
49
50 void
51 die(char const *fmt, ...)
52 {
53 va_list va;
54
55 va_start(va, fmt);
56 vlogf(1, "error", fmt, va);
57 va_end(va);
58 exit(1);
59 }
60
61 void
62 warn(char const *fmt, ...)
63 {
64 va_list va;
65
66 va_start(va, fmt);
67 vlogf(2, "warn", fmt, va);
68 va_end(va);
69 }
70
71 void
72 info(char const *fmt, ...)
73 {
74 va_list va;
75
76 va_start(va, fmt);
77 vlogf(3, "info", fmt, va);
78 va_end(va);
79 }
80
81 void
82 debug(char const *fmt, ...)
83 {
84 va_list va;
85
86 va_start(va, fmt);
87 vlogf(4, "debug", fmt, va);
88 va_end(va);
89 }