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log.c
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log.c
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/* Logging functionality. Mainly useful for debugging. */
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "globals.h"
FILE *log_file = NULL;
int log_open(char *filename) {
if (log_file != NULL) {
fclose(log_file);
}
log_file = fopen(filename, "a");
return (log_file == NULL);
}
void log_close(void) {
fclose(log_file);
log_file = NULL;
}
void log_write(char *format, ...) {
if (log_file != NULL) {
/* Print timestamp */
time_t tt = time(NULL);
struct tm *t = localtime(&tt);
fprintf(log_file, "[%02d-%02d-%04d %02d:%02d:%02d] ", t->tm_mday,
t->tm_mon, t->tm_year + 1900, t->tm_hour, t->tm_min, t->tm_sec);
va_list ap;
va_start(ap, format);
(void)vfprintf(log_file, format, ap);
va_end(ap);
fprintf(log_file, "\n");
fflush(log_file);
}
}