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misc: general documentation
author David Demelier <markand@malikania.fr>
date Thu, 04 Aug 2022 16:47:10 +0200
parents lib/log.c@081e1c258e64
children 835d52f72786
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1 /*
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2 * log.c -- logging routines
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3 *
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4 * Copyright (c) 2020-2022 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20 #include <stdio.h>
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21 #include <syslog.h>
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22 #include <time.h>
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23
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24 #include "log.h"
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25
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26 /* TODO: replace. */
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27 static struct {
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28 enum log_level verbosity;
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29 } config = {
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30 .verbosity = LOG_LEVEL_DEBUG
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31 };
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32
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33 static int syslog_levels[] = {
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34 [LOG_LEVEL_DEBUG] = LOG_DEBUG,
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35 [LOG_LEVEL_INFO] = LOG_INFO,
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36 [LOG_LEVEL_WARNING] = LOG_WARNING
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37 };
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38
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39 static const char * const levelsyms[] = {
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40 [LOG_LEVEL_DEBUG] = "D",
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41 [LOG_LEVEL_INFO] = "I",
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42 [LOG_LEVEL_WARNING] = "W"
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43 };
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44
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45 void
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46 log_open(const char *name)
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47 {
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48 openlog(name, 0, LOG_USER);
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49 }
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50
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51 void
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52 log_write(enum log_level level, const char *fmt, ...)
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53 {
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54 assert(level >= LOG_LEVEL_WARNING && level <= LOG_LEVEL_DEBUG);
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55 assert(fmt);
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56
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57 if (config.verbosity >= level) {
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58 va_list ap;
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59
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60 va_start(ap, fmt);
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61 log_vwrite(level, fmt, ap);
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62 va_end(ap);
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63 }
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64 }
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65
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66 void
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67 log_vwrite(enum log_level level, const char *fmt, va_list ap)
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68 {
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69 assert(level >= LOG_LEVEL_WARNING && level <= LOG_LEVEL_DEBUG);
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70 assert(fmt);
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71
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72 char line[BUFSIZ] = {0}, timebuf[32] = {0};
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73 time_t timestamp = time(NULL);
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74 struct tm *tm = localtime(&timestamp);
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75
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76 vsnprintf(line, sizeof (line), fmt, ap);
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77 syslog(syslog_levels[level], "%s", line);
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79 strftime(timebuf, sizeof (timebuf), "%F %T", tm);
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80 printf("%s %s %s\n", timebuf, levelsyms[level], line);
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81 }
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82
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83 void
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84 log_finish(void)
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85 {
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86 if (config.verbosity > 0)
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87 closelog();
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88 }