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Refactor, reduce code duplication

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Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg committed 2021-03-07 10:28:54 +01:00
1 parent d6390244ad
commit 305ad302f2
5 files changed
+113 -136
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src/utmp-api.c
+3 -66
View File
@@ -35,6 +35,9 @@
#define MAX_NO 5
#define MAX_SZ 100 * 1024
extern int logrotate(char *file, int num, off_t sz);
static void utmp_strncpy(char *dst, const char *src, size_t dlen)
{
size_t i;
@@ -46,72 +49,6 @@ static void utmp_strncpy(char *dst, const char *src, size_t dlen)
dst[i] = 0;
}
#ifdef LOGROTATE_ENABLED
/*
* This function triggers a log rotates of @file when size >= @sz bytes
* At most @num old versions are kept and by default it starts gzipping
* .2 and older log files. If gzip is not available in $PATH then @num
* files are kept uncompressed.
*/
static int logrotate(char *file, int num, off_t sz)
{
int cnt;
struct stat st;
if (stat(file, &st))
return 1;
if (sz > 0 && S_ISREG(st.st_mode) && st.st_size > sz) {
if (num > 0) {
size_t len = strlen(file) + 10 + 1;
char ofile[len];
char nfile[len];
/* First age zipped log files */
for (cnt = num; cnt > 2; cnt--) {
snprintf(ofile, len, "%s.%d.gz", file, cnt - 1);
snprintf(nfile, len, "%s.%d.gz", file, cnt);
/* May fail because ofile doesn't exist yet, ignore. */
if (rename(ofile, nfile) && errno != ENOENT)
logit(LOG_ERR, "Failed logrotate %s: %s",
ofile, strerror(errno));
}
for (cnt = num; cnt > 0; cnt--) {
snprintf(ofile, len, "%s.%d", file, cnt - 1);
snprintf(nfile, len, "%s.%d", file, cnt);
/* May fail because ofile doesn't exist yet, ignore. */
if (rename(ofile, nfile) && errno != ENOENT) {
logit(LOG_ERR, "Failed logrotate %s: %s",
ofile, strerror(errno));
continue;
}
if (cnt == 2 && fexist(nfile)) {
if (systemf("gzip %s", nfile))
continue; /* no gzip, probably */
(void)remove(nfile);
}
}
if (rename(file, nfile))
goto fallback;
create(file, st.st_mode, st.st_uid, st.st_gid);
} else {
fallback:
if (truncate(file, 0))
logit(LOG_ERR, "Failed truncating %s during logrotate: %s",
file, strerror(errno));
}
}
return 0;
}
#endif /* LOGROTATE_ENABLED */
/*
* Rotate /var/log/wtmp (+ btmp?) and /run/utmp
*