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tlog.c - ploot - simple plotting tools |
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git clone git://bitreich.org/ploot git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/ploot (git://bitreich.org) |
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README |
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--- |
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tlog.c (1502B) |
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--- |
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1 #include "log.h" |
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2 |
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3 #include <string.h> |
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4 |
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5 /* |
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6 * log.c - log to standard error according to the log level |
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7 * |
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8 * Instead of logging to syslog, delegate logging to a separate |
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9 * tool, such as FreeBSD's daemon(8), POSIX's logger(1). |
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10 * |
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11 * log_init() sets the log level to the "LOG" environment variable |
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12 * if set, or to 4 (log down to info included) otherwise. |
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13 */ |
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14 |
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15 #include <errno.h> |
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16 #include <stdlib.h> |
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17 #include <stdio.h> |
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18 |
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19 #define LOG_DEFAULT 2 /* info */ |
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20 |
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21 int log_level = -1; |
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22 |
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23 void |
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24 vlogf(int level, char const *flag, char const *fmt, va_list va) |
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25 { |
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26 char *env; |
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27 |
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28 if (log_level == -1) { |
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29 env = getenv("LOG"); |
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30 log_level = env ? atoi(env) : 0; |
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31 log_level = log_level > 0 ? log_level : LOG_DEFAULT; |
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32 } |
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33 |
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34 if (log_level < level) |
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35 return; |
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36 |
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37 fprintf(stderr, "%s: ", flag); |
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38 vfprintf(stderr, fmt, va); |
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39 |
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40 if (errno) |
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41 fprintf(stderr, ": %s", strerror(errno)); |
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42 errno = 0; |
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43 |
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44 fprintf(stderr, "\n"); |
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45 fflush(stderr); |
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46 } |
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47 |
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48 void |
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49 die(int exitcode, char const *fmt, ...) |
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50 { |
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51 va_list va; |
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52 |
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53 va_start(va, fmt); |
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54 vlogf(0, "error", fmt, va); |
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55 va_end(va); |
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56 exit(exitcode); |
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57 } |
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58 |
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59 void |
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60 error(char const *fmt, ...) |
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61 { |
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62 va_list va; |
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63 |
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64 va_start(va, fmt); |
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65 vlogf(0, "error", fmt, va); |
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66 va_end(va); |
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67 } |
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68 |
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69 void |
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70 warn(char const *fmt, ...) |
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71 { |
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72 va_list va; |
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73 |
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74 va_start(va, fmt); |
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75 vlogf(1, "warn", fmt, va); |
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76 va_end(va); |
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77 } |
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78 |
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79 void |
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80 info(char const *fmt, ...) |
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81 { |
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82 va_list va; |
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83 |
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84 va_start(va, fmt); |
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85 vlogf(2, "info", fmt, va); |
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86 va_end(va); |
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87 } |
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88 |
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89 void |
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90 debug(char const *fmt, ...) |
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91 { |
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92 va_list va; |
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93 |
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94 va_start(va, fmt); |
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95 vlogf(3, "debug", fmt, va); |
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96 va_end(va); |
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97 } |
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