static void verror_msg_helper(const char *s,
va_list p,
const char* strerr,
int flags)
{
char *msg;
int prefix_len, strerr_len, msgeol_len, used;
if (!logmode)
return;
used = vasprintf(&msg, s, p);
if (used < 0)
return;
/* This is ugly and costs +60 bytes compared to multiple
* fprintf's, but is guaranteed to do a single write.
* This is needed for e.g. when multiple children
* can produce log messages simultaneously. */
prefix_len = msg_prefix[0] ? strlen(msg_prefix) + 2 : 0;
strerr_len = strerr ? strlen(strerr) : 0;
msgeol_len = strlen(msg_eol);
/* +3 is for ": " before strerr and for terminating NUL */
msg = (char*) xrealloc(msg, prefix_len + used + strerr_len + msgeol_len + 3);
/* TODO: maybe use writev instead of memmoving? Need full_writev? */
if (prefix_len) {
char *p;
memmove(msg + prefix_len, msg, used);
used += prefix_len;
p = stpcpy(msg, msg_prefix);
p[0] = ':';
p[1] = ' ';
}
if (strerr) {
if (s[0]) {
msg[used++] = ':';
msg[used++] = ' ';
}
strcpy(&msg[used], strerr);
used += strerr_len;
}
strcpy(&msg[used], msg_eol);
if (flags & LOGMODE_STDIO) {
fflush(stdout);
full_write(STDERR_FILENO, msg, used + msgeol_len);
}
msg[used] = '\0'; /* remove msg_eol (usually "\n") */
if (flags & LOGMODE_SYSLOG) {
syslog(LOG_ERR, "%s", msg + prefix_len);
}
if ((flags & LOGMODE_CUSTOM) && g_custom_logger) {
g_custom_logger(msg + prefix_len);
}
free(msg);
}
static void verror_msg_helper(const char *s,
va_list p,
const char *strerr,
int flags)
{
if (!logmode)
return;
/* This is ugly and costs +60 bytes compared to multiple
* fprintf's, but is guaranteed to do a single write.
* This is needed for e.g. when multiple children
* can produce log messages simultaneously. */
int prefix_len = msg_prefix[0] ? strlen(msg_prefix) + 2 : 0;
int strerr_len = strerr ? strlen(strerr) : 0;
int msgeol_len = strlen(msg_eol);
int used;
/* Try to format the message in a fixed buffer.
* This eliminates malloc.
* Main reason isn't the speed optimization, but to make
* short logging safe after fork in multithreaded libraries.
*/
char buf[1024];
va_list p2;
va_copy(p2, p);
if (prefix_len < sizeof(buf))
used = vsnprintf(buf + prefix_len, sizeof(buf) - prefix_len, s, p2);
else
used = vsnprintf(buf, 0, s, p2);
va_end(p2);
char *msg = buf;
/* +3 is for ": " before strerr and for terminating NUL */
unsigned total_len = prefix_len + used + strerr_len + msgeol_len + 3;
#if USE_ALLOCA
if (total_len >= sizeof(buf))
{
msg = alloca(total_len);
used = vsnprintf(msg + prefix_len, total_len - prefix_len, s, p);
}
#else
#define LOGMODE_DIE ((unsigned)INT_MAX + 1)
char *malloced = NULL;
if (total_len >= sizeof(buf))
{
/* Nope, need to malloc the buffer.
* Can't use xmalloc: it calls error_msg_and_die on failure,
* that will result in a recursion.
*/
msg = malloced = malloc(total_len);
if (!msg)
{
/* Same as xmalloc error */
msg = strcpy(buf, "Out of memory, exiting\n");
used = strlen(msg) - 1;
msgeol_len = 1; /* '\n' */
prefix_len = 0;
flags |= LOGMODE_DIE;
goto send_it;
}
used = vsnprintf(msg + prefix_len, total_len - prefix_len, s, p);
}
#endif
if (prefix_len) {
char *p;
used += prefix_len;
p = stpcpy(msg, msg_prefix);
p[0] = ':';
p[1] = ' ';
}
if (strerr) {
if (s[0]) {
msg[used++] = ':';
msg[used++] = ' ';
}
strcpy(&msg[used], strerr);
used += strerr_len;
}
strcpy(&msg[used], msg_eol);
#if !USE_ALLOCA
send_it:
#endif
if (flags & LOGMODE_STDIO) {
/*fflush(stdout); - unsafe after fork! */
full_write(STDERR_FILENO, msg, used + msgeol_len);
}
msg[used] = '\0'; /* remove msg_eol (usually "\n") */
if (flags & LOGMODE_SYSLOG) {
syslog(LOG_ERR, "%s", msg + prefix_len);
}
if ((flags & LOGMODE_CUSTOM) && g_custom_logger) {
g_custom_logger(msg + prefix_len);
}
#if !USE_ALLOCA
free(malloced);
if (flags & LOGMODE_DIE)
xfunc_die();
#endif
}