A fast, lightweight and minimalistic Wayland terminal emulator
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#include "log.h"
#include <errno.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "debug.h"
#include "util.h"
#include "xsnprintf.h"
static bool colorize = false;
static bool do_syslog = true;
static enum log_class log_level = LOG_CLASS_NONE;
static const struct {
const char name[8];
const char log_prefix[7];
uint8_t color;
int syslog_equivalent;
} log_level_map[] = {
[LOG_CLASS_NONE] = {"none", "none", 5, -1},
[LOG_CLASS_ERROR] = {"error", " err", 31, LOG_ERR},
[LOG_CLASS_WARNING] = {"warning", "warn", 33, LOG_WARNING},
[LOG_CLASS_INFO] = {"info", "info", 97, LOG_INFO},
[LOG_CLASS_DEBUG] = {"debug", " dbg", 36, LOG_DEBUG},
};
void
log_init(enum log_colorize _colorize, bool _do_syslog,
enum log_facility syslog_facility, enum log_class _log_level)
{
static const int facility_map[] = {
[LOG_FACILITY_USER] = LOG_USER,
[LOG_FACILITY_DAEMON] = LOG_DAEMON,
};
colorize = _colorize == LOG_COLORIZE_NEVER ? false : _colorize == LOG_COLORIZE_ALWAYS ? true : isatty(STDERR_FILENO);
do_syslog = _do_syslog;
log_level = _log_level;
int slvl = log_level_map[_log_level].syslog_equivalent;
if (do_syslog && slvl != -1) {
openlog(NULL, /*LOG_PID*/0, facility_map[syslog_facility]);
setlogmask(LOG_UPTO(slvl));
}
}
void
log_deinit(void)
{
if (do_syslog)
closelog();
}
static void
_log(enum log_class log_class, const char *module, const char *file, int lineno,
const char *fmt, int sys_errno, va_list va)
{
xassert(log_class > LOG_CLASS_NONE);
xassert(log_class < ALEN(log_level_map));
if (log_class > log_level)
return;
const char *prefix = log_level_map[log_class].log_prefix;
unsigned int class_clr = log_level_map[log_class].color;
char clr[16];
xsnprintf(clr, sizeof(clr), "\033[%um", class_clr);
fprintf(stderr, "%s%s%s: ", colorize ? clr : "", prefix, colorize ? "\033[0m" : "");
if (colorize)
fputs("\033[2m", stderr);
fprintf(stderr, "%s:%d: ", file, lineno);
if (colorize)
fputs("\033[0m", stderr);
vfprintf(stderr, fmt, va);
if (sys_errno != 0)
fprintf(stderr, ": %s", strerror(sys_errno));
fputc('\n', stderr);
}
static void
_sys_log(enum log_class log_class, const char *module,
const char UNUSED *file, int UNUSED lineno,
const char *fmt, int sys_errno, va_list va)
{
xassert(log_class > LOG_CLASS_NONE);
xassert(log_class < ALEN(log_level_map));
if (!do_syslog)
return;
/* Map our log level to syslog's level */
int level = log_level_map[log_class].syslog_equivalent;
char msg[4096];
int n = vsnprintf(msg, sizeof(msg), fmt, va);
xassert(n >= 0);
if (sys_errno != 0 && (size_t)n < sizeof(msg))
snprintf(msg + n, sizeof(msg) - n, ": %s", strerror(sys_errno));
syslog(level, "%s: %s", module, msg);
}
void
log_msg_va(enum log_class log_class, const char *module,
const char *file, int lineno, const char *fmt, va_list va)
{
va_list va2;
va_copy(va2, va);
_log(log_class, module, file, lineno, fmt, 0, va);
_sys_log(log_class, module, file, lineno, fmt, 0, va2);
va_end(va2);
}
void
log_msg(enum log_class log_class, const char *module,
const char *file, int lineno, const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
log_msg_va(log_class, module, file, lineno, fmt, va);
va_end(va);
}
void
log_errno_va(enum log_class log_class, const char *module,
const char *file, int lineno,
const char *fmt, va_list va)
{
log_errno_provided_va(log_class, module, file, lineno, errno, fmt, va);
}
void
log_errno(enum log_class log_class, const char *module,
const char *file, int lineno,
const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
log_errno_va(log_class, module, file, lineno, fmt, va);
va_end(va);
}
void
log_errno_provided_va(enum log_class log_class, const char *module,
const char *file, int lineno, int errno_copy,
const char *fmt, va_list va)
{
va_list va2;
va_copy(va2, va);
_log(log_class, module, file, lineno, fmt, errno_copy, va);
_sys_log(log_class, module, file, lineno, fmt, errno_copy, va2);
va_end(va2);
}
void
log_errno_provided(enum log_class log_class, const char *module,
const char *file, int lineno, int errno_copy,
const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
log_errno_provided_va(log_class, module, file, lineno, errno_copy, fmt, va);
va_end(va);
}
static size_t
map_len(void)
{
size_t len = ALEN(log_level_map);
#ifndef _DEBUG
/* Exclude "debug" entry for non-debug builds */
len--;
#endif
return len;
}
int
log_level_from_string(const char *str)
{
if (unlikely(str[0] == '\0'))
return -1;
for (int i = 0, n = map_len(); i < n; i++)
if (strcmp(str, log_level_map[i].name) == 0)
return i;
return -1;
}
const char *
log_level_string_hint(void)
{
static char buf[64];
if (buf[0] != '\0')
return buf;
for (size_t i = 0, pos = 0, n = map_len(); i < n; i++) {
const char *entry = log_level_map[i].name;
const char *delim = (i + 1 < n) ? ", " : "";
pos += xsnprintf(buf + pos, sizeof(buf) - pos, "'%s'%s", entry, delim);
}
return buf;
}