tlog.c - iomenu - interactive terminal-based selection menu
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       ---
       tlog.c (1217B)
       ---
            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 }