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logit: parse leading <LEVEL> in log messages

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Add support for systemd daemon log style.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2025-07-02 16:43:44 +02:00
parent d95fc5f790
commit f24f76fc80
1 changed files with 41 additions and 5 deletions
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src/logit.c
+41 -5
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@@ -90,15 +90,51 @@ reopen:
return fclose(fp);
}
static int logit(int level, char *buf, size_t len)
/*
* Parse possible systemd style log <level> prefix from message
* For details, see libsystemd/sd-daemon.h
*
* Returns the level, and updates buf to point past the prefix
*/
static int parse_level(char **buf, int default_level)
{
if (buf[0]) {
syslog(level, "%s", buf);
return 0;
char *msg = *buf;
if (msg[0] == '<' && msg[2] == '>' && msg[1] >= '0' && msg[1] <= '7') {
int level;
switch (msg[1]) {
case '0': level = LOG_EMERG; break;
case '1': level = LOG_ALERT; break;
case '2': level = LOG_CRIT; break;
case '3': level = LOG_ERR; break;
case '4': level = LOG_WARNING; break;
case '5': level = LOG_NOTICE; break;
case '6': level = LOG_INFO; break;
case '7': level = LOG_DEBUG; break;
default: level = default_level; break;
}
*buf = msg + 3;
return (default_level & ~LOG_PRIMASK) | level;
}
return default_level;
}
static int do_log(int level, char *msg)
{
syslog(parse_level(&msg, level), "%s", msg);
return 0;
}
static int logit(int level, char *buf, size_t len)
{
if (buf[0])
return do_log(level, buf);
while ((fgets(buf, len, stdin)))
syslog(level, "%s", buf);
do_log(level, buf);
return 0;
}