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tlog.c - iomenu - interactive terminal-based selection menu
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tlog.c (1217B)
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1 #include "log.h"
2
3 #include <assert.h>
4 #include <errno.h>
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <string.h>
8
9 #ifndef LOG_DEFAULT
10 #define LOG_DEFAULT 3 /* info */
11 #endif
12
13 char *arg0 = NULL;
14 static int log_level = -1;
15
16 void
17 log_vprintf(int level, char const *flag, char const *fmt, va_list va)
18 {
19 char *env;
20 int old_errno = errno;
21
22 if (log_level < 0) {
23 env = getenv("LOG");
24 log_level = (env == NULL) ? 0 : atoi(env);
25 if (log_level == 0)
26 log_level = LOG_DEFAULT;
27 }
28
29 if (log_level < level)
30 return;
31
32 if (arg0 != NULL)
33 fprintf(stderr, "%s: ", arg0);
34
35 fprintf(stderr, "%s: ", flag);
36 vfprintf(stderr, fmt, va);
37
38 if (old_errno != 0)
39 fprintf(stderr, ": %s", strerror(old_errno));
40
41 fprintf(stderr, "\n");
42 fflush(stderr);
43 }
44
45 void
46 die(char const *fmt, ...)
47 {
48 va_list va;
49 va_start(va, fmt); log_vprintf(1, "error", fmt, va); va_end(va);
50 exit(1);
51 }
52
53 void
54 warn(char const *fmt, ...)
55 {
56 va_list va;
57 va_start(va, fmt); log_vprintf(2, "warn", fmt, va); va_end(va);
58 }
59
60 void
61 info(char const *fmt, ...)
62 {
63 va_list va;
64 va_start(va, fmt); log_vprintf(3, "info", fmt, va); va_end(va);
65 }
66
67 void
68 debug(char const *fmt, ...)
69 {
70 va_list va;
71 va_start(va, fmt); log_vprintf(4, "debug", fmt, va); va_end(va);
72 }