tlog.c - ics2txt - convert icalendar .ics file to plain text
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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 }