ultimecia

A ps1 emulator in c
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log.c (3918B)

      1 /*
      2  * Copyright (c) 2020 rxi
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a copy
      5  * of this software and associated documentation files (the "Software"), to
      6  * deal in the Software without restriction, including without limitation the
      7  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
      8  * sell copies of the Software, and to permit persons to whom the Software is
      9  * furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice shall be included in
     12  * all copies or substantial portions of the Software.
     13  *
     14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     20  * IN THE SOFTWARE.
     21  */
     22 
     23 #include "log.h"
     24 
     25 #define MAX_CALLBACKS 32
     26 
     27 typedef struct {
     28   log_LogFn fn;
     29   void *udata;
     30   int level;
     31 } Callback;
     32 
     33 static struct {
     34   void *udata;
     35   log_LockFn lock;
     36   int level;
     37   bool quiet;
     38   Callback callbacks[MAX_CALLBACKS];
     39 } L;
     40 
     41 
     42 static const char *level_strings[] = {
     43   "TRACE", "DEBUG", "INFO", "WARN", "ERROR", "FATAL"
     44 };
     45 
     46 #ifdef LOG_USE_COLOR
     47 static const char *level_colors[] = {
     48   "\x1b[94m", "\x1b[36m", "\x1b[32m", "\x1b[33m", "\x1b[31m", "\x1b[35m"
     49 };
     50 #endif
     51 
     52 
     53 static void stdout_callback(log_Event *ev) {
     54   char buf[16];
     55   buf[strftime(buf, sizeof(buf), "%H:%M:%S", ev->time)] = '\0';
     56 #ifdef LOG_USE_COLOR
     57   fprintf(
     58     ev->udata, "%s %s%-5s\x1b[0m \x1b[90m%s:%d:\x1b[0m ",
     59     buf, level_colors[ev->level], level_strings[ev->level],
     60     ev->file, ev->line);
     61 #else
     62   fprintf(
     63     ev->udata, "%s %-5s %s:%d: ",
     64     buf, level_strings[ev->level], ev->file, ev->line);
     65 #endif
     66   vfprintf(ev->udata, ev->fmt, ev->ap);
     67   fprintf(ev->udata, "\n");
     68   fflush(ev->udata);
     69 }
     70 
     71 
     72 static void file_callback(log_Event *ev) {
     73   char buf[64];
     74   buf[strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", ev->time)] = '\0';
     75   fprintf(
     76     ev->udata, "%s %-5s %s:%d: ",
     77     buf, level_strings[ev->level], ev->file, ev->line);
     78   vfprintf(ev->udata, ev->fmt, ev->ap);
     79   fprintf(ev->udata, "\n");
     80   fflush(ev->udata);
     81 }
     82 
     83 
     84 static void lock(void)   {
     85   if (L.lock) { L.lock(true, L.udata); }
     86 }
     87 
     88 
     89 static void unlock(void) {
     90   if (L.lock) { L.lock(false, L.udata); }
     91 }
     92 
     93 
     94 const char* log_level_string(int level) {
     95   return level_strings[level];
     96 }
     97 
     98 
     99 void log_set_lock(log_LockFn fn, void *udata) {
    100   L.lock = fn;
    101   L.udata = udata;
    102 }
    103 
    104 
    105 void log_set_level(int level) {
    106   L.level = level;
    107 }
    108 
    109 
    110 void log_set_quiet(bool enable) {
    111   L.quiet = enable;
    112 }
    113 
    114 
    115 int log_add_callback(log_LogFn fn, void *udata, int level) {
    116   for (int i = 0; i < MAX_CALLBACKS; i++) {
    117     if (!L.callbacks[i].fn) {
    118       L.callbacks[i] = (Callback) { fn, udata, level };
    119       return 0;
    120     }
    121   }
    122   return -1;
    123 }
    124 
    125 
    126 int log_add_fp(FILE *fp, int level) {
    127   return log_add_callback(file_callback, fp, level);
    128 }
    129 
    130 
    131 static void init_event(log_Event *ev, void *udata) {
    132   if (!ev->time) {
    133     time_t t = time(NULL);
    134     ev->time = localtime(&t);
    135   }
    136   ev->udata = udata;
    137 }
    138 
    139 
    140 void log_log(int level, const char *file, int line, const char *fmt, ...) {
    141   log_Event ev = {
    142     .fmt   = fmt,
    143     .file  = file,
    144     .line  = line,
    145     .level = level,
    146   };
    147 
    148   lock();
    149 
    150   if (!L.quiet && level >= L.level) {
    151     init_event(&ev, stderr);
    152     va_start(ev.ap, fmt);
    153     stdout_callback(&ev);
    154     va_end(ev.ap);
    155   }
    156 
    157   for (int i = 0; i < MAX_CALLBACKS && L.callbacks[i].fn; i++) {
    158     Callback *cb = &L.callbacks[i];
    159     if (level >= cb->level) {
    160       init_event(&ev, cb->udata);
    161       va_start(ev.ap, fmt);
    162       cb->fn(&ev);
    163       va_end(ev.ap);
    164     }
    165   }
    166 
    167   unlock();
    168 }