A fast, lightweight and minimalistic Wayland terminal emulator
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4.3 KiB

#include "log.h"
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <stdbool.h>
#include <errno.h>
#include <assert.h>
#include <unistd.h>
#include <syslog.h>
static bool colorize = false;
static void __attribute__((constructor))
init(void)
{
colorize = isatty(STDOUT_FILENO);
}
void
log_init(enum log_facility syslog_facility, enum log_class syslog_level)
{
static const int facility_map[] = {
[LOG_FACILITY_USER] = LOG_USER,
[LOG_FACILITY_DAEMON] = LOG_DAEMON,
};
static const int level_map[] = {
[LOG_CLASS_ERROR] = LOG_ERR,
[LOG_CLASS_WARNING] = LOG_WARNING,
[LOG_CLASS_INFO] = LOG_INFO,
[LOG_CLASS_DEBUG] = LOG_DEBUG,
};
openlog(NULL, /*LOG_PID*/0, facility_map[syslog_facility]);
setlogmask(LOG_UPTO(level_map[syslog_level]));
}
void
log_deinit(void)
{
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)
{
const char *class = "abcd";
int class_clr = 0;
switch (log_class) {
case LOG_CLASS_ERROR: class = " err"; class_clr = 31; break;
case LOG_CLASS_WARNING: class = "warn"; class_clr = 33; break;
case LOG_CLASS_INFO: class = "info"; class_clr = 97; break;
case LOG_CLASS_DEBUG: class = " dbg"; class_clr = 36; break;
}
char clr[16];
snprintf(clr, sizeof(clr), "\e[%dm", class_clr);
printf("%s%s%s: ", colorize ? clr : "", class, colorize ? "\e[0m" : "");
if (colorize)
printf("\e[2m");
#if defined(_DEBUG)
printf("%s:%d: ", file, lineno);
#else
printf("%s: ", module);
#endif
if (colorize)
printf("\e[0m");
vprintf(fmt, va);
if (sys_errno != 0)
printf(": %s", strerror(sys_errno));
printf("\n");
}
static void
_sys_log(enum log_class log_class, const char *module,
const char *file __attribute__((unused)),
int lineno __attribute__((unused)),
const char *fmt, int sys_errno, va_list va)
{
/* Map our log level to syslog's level */
int level = -1;
switch (log_class) {
case LOG_CLASS_ERROR: level = LOG_ERR; break;
case LOG_CLASS_WARNING: level = LOG_WARNING; break;
case LOG_CLASS_INFO: level = LOG_INFO; break;
case LOG_CLASS_DEBUG: level = LOG_DEBUG; break;
}
assert(level != -1);
const char *sys_err = sys_errno != 0 ? strerror(sys_errno) : NULL;
va_list va2;
va_copy(va2, va);
/* Calculate required size of buffer holding the entire log message */
int required_len = 0;
required_len += strlen(module) + 2; /* "%s: " */
required_len += vsnprintf(NULL, 0, fmt, va2); va_end(va2);
if (sys_errno != 0)
required_len += strlen(sys_err) + 2; /* ": %s" */
/* Format the msg */
char *msg = malloc(required_len + 1);
int idx = 0;
idx += snprintf(&msg[idx], required_len + 1 - idx, "%s: ", module);
idx += vsnprintf(&msg[idx], required_len + 1 - idx, fmt, va);
if (sys_errno != 0) {
snprintf(
&msg[idx], required_len + 1 - idx, ": %s", strerror(sys_errno));
}
syslog(level, "%s", msg);
free(msg);
}
void
log_msg(enum log_class log_class, const char *module,
const char *file, int lineno, const char *fmt, ...)
{
va_list ap1, ap2;
va_start(ap1, fmt);
va_copy(ap2, ap1);
_log(log_class, module, file, lineno, fmt, 0, ap1);
_sys_log(log_class, module, file, lineno, fmt, 0, ap2);
va_end(ap1);
va_end(ap2);
}
void log_errno(enum log_class log_class, const char *module,
const char *file, int lineno,
const char *fmt, ...)
{
va_list ap1, ap2;
va_start(ap1, fmt);
va_copy(ap2, ap1);
_log(log_class, module, file, lineno, fmt, errno, ap1);
_sys_log(log_class, module, file, lineno, fmt, errno, ap2);
va_end(ap1);
va_end(ap2);
}
void log_errno_provided(enum log_class log_class, const char *module,
const char *file, int lineno, int _errno,
const char *fmt, ...)
{
va_list ap1, ap2;
va_start(ap1, fmt);
va_copy(ap2, ap1);
_log(log_class, module, file, lineno, fmt, _errno, ap1);
_sys_log(log_class, module, file, lineno, fmt, _errno, ap2);
va_end(ap1);
va_end(ap2);
}