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	tlog.c - ics2txt - convert icalendar .ics file to plain text
	git clone git://bitreich.org/ics2txt git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws…
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	---
	tlog.c (1353B)
	---
	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 }