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#ifdef __GLIBC__
# define _XOPEN_SOURCE // fdopen
#endif
#include "tickit.h"
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h> // getpid
#define streq(a,b) (!strcmp(a,b))
static void (*debug_func)(const char *str, void *data);
static void *debug_func_data;
static FILE *debug_fh;
/* This needs to default true on startup so the first debugging call gets
* made, which then lets us inspect the env. vars. to set it correctly
*/
bool tickit_debug_enabled = true;
struct Flag {
struct Flag *next;
char *name;
};
static struct Flag *enabled_flags;
static bool init_done = false;
void tickit_debug_init(void)
{
if(init_done)
return;
const char *flags_str = getenv("TICKIT_DEBUG_FLAGS");
while(flags_str) {
const char *endp = strchr(flags_str, ',');
if(!endp)
endp = flags_str + strlen(flags_str);
struct Flag *newflag = malloc(sizeof *newflag);
newflag->name = malloc(endp - flags_str + 1);
strncpy(newflag->name, flags_str, endp - flags_str);
newflag->name[endp - flags_str] = 0;
newflag->next = enabled_flags;
enabled_flags = newflag;
flags_str = endp;
if(flags_str[0] == ',')
flags_str++;
else
break;
}
if(!debug_func) {
const char *val;
if((val = getenv("TICKIT_DEBUG_FD")) && val[0]) {
int fd;
if(sscanf(val, "%d", &fd))
tickit_debug_set_fh(fdopen(fd, "a"));
}
else if((val = getenv("TICKIT_DEBUG_FILE")) && val[0]) {
tickit_debug_open(val);
}
else if(enabled_flags) {
char name[17];
sprintf(name, "tickit-%d.log", getpid());
tickit_debug_open(name);
}
}
tickit_debug_enabled = !!enabled_flags && (debug_func || debug_fh);
init_done = true;
}
static bool flag_enabled(const char *name)
{
for(struct Flag *f = enabled_flags; f; f = f->next) {
if(f->name[0] == '*')
return true;
if(name[0] != f->name[0])
continue;
if(!f->name[1])
return true;
if(streq(name+1, f->name+1))
return true;
}
return false;
}
void tickit_debug_set_func(void (*func)(const char *str, void *data), void *data)
{
debug_func = func;
debug_func_data = data;
if(debug_fh)
fclose(debug_fh);
tickit_debug_enabled = !!enabled_flags && (debug_func || debug_fh);
}
void tickit_debug_set_fh(FILE *fh)
{
if(debug_fh)
fclose(debug_fh);
debug_fh = fh;
if(debug_fh)
setvbuf(debug_fh, NULL, _IONBF, 0);
if(debug_func)
debug_func = NULL;
tickit_debug_enabled = !!enabled_flags && (debug_func || debug_fh);
}
bool tickit_debug_open(const char *path)
{
FILE *fh = fopen(path, "a");
if(!fh)
return false;
tickit_debug_set_fh(fh);
return true;
}
void tickit_debug_logf(const char *flag, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
tickit_debug_vlogf(flag, fmt, args);
va_end(args);
}
void tickit_debug_vlogf(const char *flag, const char *fmt, va_list args)
{
if(!init_done)
tickit_debug_init();
if(!tickit_debug_enabled)
return;
if(!flag_enabled(flag))
return;
struct timeval now;
gettimeofday(&now, NULL);
char timestamp[9];
strftime(timestamp, sizeof timestamp, "%H:%M:%S", localtime(&now.tv_sec));
#define LINE_PREFIX "%s.%03d [%-3s]: "
if(debug_func) {
size_t len;
va_list args_copy;
va_copy(args_copy, args);
len = snprintf(NULL, 0, LINE_PREFIX, timestamp, 0, flag) +
vsnprintf(NULL, 0, fmt, args_copy) +
1;
va_end(args_copy);
char *buf = malloc(len + 1);
{
char *s = buf;
s += sprintf(s, LINE_PREFIX, timestamp, (int)(now.tv_usec / 1000), flag);
s += vsprintf(s, fmt, args);
s += sprintf(s, "\n");
}
(*debug_func)(buf, debug_func_data);
free(buf);
}
else if(debug_fh) {
fprintf(debug_fh, LINE_PREFIX, timestamp, (int)(now.tv_usec / 1000), flag);
vfprintf(debug_fh, fmt, args);
fprintf(debug_fh, "\n");
}
#undef LINE_PREFIX
}
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