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#include <errno.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include "log.h"
const long NSEC_PER_SEC = 1000000000;
static void log_stderr(enum libseat_log_level level, const char *fmt, va_list args);
static enum libseat_log_level current_log_level;
static libseat_log_func current_log_handler = log_stderr;
static struct timespec start_time = {-1, -1};
static bool colored = false;
static const char *verbosity_colors[] = {
[LIBSEAT_LOG_LEVEL_SILENT] = "",
[LIBSEAT_LOG_LEVEL_ERROR] = "\x1B[1;31m",
[LIBSEAT_LOG_LEVEL_INFO] = "\x1B[1;34m",
[LIBSEAT_LOG_LEVEL_DEBUG] = "\x1B[1;90m",
};
static const char *verbosity_headers[] = {
[LIBSEAT_LOG_LEVEL_SILENT] = "",
[LIBSEAT_LOG_LEVEL_ERROR] = "[ERROR]",
[LIBSEAT_LOG_LEVEL_INFO] = "[INFO]",
[LIBSEAT_LOG_LEVEL_DEBUG] = "[DEBUG]",
};
static void timespec_sub(struct timespec *r, const struct timespec *a, const struct timespec *b) {
r->tv_sec = a->tv_sec - b->tv_sec;
r->tv_nsec = a->tv_nsec - b->tv_nsec;
if (r->tv_nsec < 0) {
r->tv_sec--;
r->tv_nsec += NSEC_PER_SEC;
}
}
static void log_stderr(enum libseat_log_level level, const char *fmt, va_list args) {
struct timespec ts = {0};
clock_gettime(CLOCK_MONOTONIC, &ts);
timespec_sub(&ts, &ts, &start_time);
unsigned c = (level < LIBSEAT_LOG_LEVEL_LAST) ? level : LIBSEAT_LOG_LEVEL_LAST - 1;
const char *prefix, *postfix;
if (colored) {
prefix = verbosity_colors[c];
postfix = "\x1B[0m\n";
} else {
prefix = verbosity_headers[c];
postfix = "\n";
}
fprintf(stderr, "%02d:%02d:%02d.%03ld %s ", (int)(ts.tv_sec / 60 / 60),
(int)(ts.tv_sec / 60 % 60), (int)(ts.tv_sec % 60), ts.tv_nsec / 1000000, prefix);
vfprintf(stderr, fmt, args);
fprintf(stderr, "%s", postfix);
}
void log_init(enum libseat_log_level level) {
if (start_time.tv_sec >= 0) {
return;
}
clock_gettime(CLOCK_MONOTONIC, &start_time);
current_log_level = level;
colored = isatty(STDERR_FILENO);
}
void _logf(enum libseat_log_level level, const char *fmt, ...) {
int stored_errno = errno;
va_list args;
if (level > current_log_level) {
return;
}
va_start(args, fmt);
current_log_handler(level, fmt, args);
va_end(args);
errno = stored_errno;
}
void libseat_set_log_handler(libseat_log_func handler) {
if (handler == NULL) {
handler = log_stderr;
}
current_log_handler = handler;
}
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