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#include "log.h"
#include <stdbool.h>
#include <unistd.h>
#include <errno.h>
static FILE *log_file = NULL;
static void get_timestamp(char timestamp[24]) {
struct tm tm = {0};
localtime_r((const time_t[1]) { time(NULL) }, &tm);
strftime(timestamp, 24, "[%Y-%m-%d %H:%M:%S]", &tm);
}
void log_init(const char *out) {
assert(!log_file);
log_file = fopen(out, "a");
if (log_file) {
char timestamp[24] = {0};
get_timestamp(timestamp);
fprintf(log_file, "\n\n--- new session %s ---\n", timestamp);
} else {
perror("fopen");
}
}
void log_message(int severity, const char *fmt, va_list args) {
char *message = va_sprintf(fmt, args);
if (!message) return;
if (log_file) {
char timestamp[24] = {0};
get_timestamp(timestamp);
fprintf(log_file, "%s ", timestamp);
}
const char *color_start = "", *severity_str = "???";
switch (severity) {
case LOG_ERROR:
color_start = "\x1b[91m";
severity_str = "error";
break;
case LOG_WARNING:
color_start = "\x1b[93m";
severity_str = "warning";
break;
}
bool color = isatty(2) == 1;
if (color)
fprintf(stderr, "%s", color_start);
fprintf(stderr, "%s: ", severity_str);
if (color)
fprintf(stderr, "\x1b[0m");
fprintf(stderr, "%s\n", message);
if (log_file) fprintf(log_file, "%s: %s\n", severity_str, message);
free(message);
}
void log_error(const char *fmt, ...) {
va_list args;
va_start(args, fmt);
log_message(LOG_ERROR, fmt, args);
va_end(args);
}
void log_perror(const char *fmt, ...) {
int err = errno;
va_list args;
va_start(args, fmt);
char *prefix = va_sprintf(fmt, args);
va_end(args);
char error[64];
*error = '\0';
strerror_r(err, error, sizeof error);
log_error("%s: %s", prefix, error);
free(prefix);
}
void log_warning(const char *fmt, ...) {
va_list args;
va_start(args, fmt);
log_message(LOG_WARNING, fmt, args);
va_end(args);
}
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