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logging_format.c
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logging_format.c
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/* Logging facility formatter.
* Copyright (C) 2009, 2010 Likai Liu <[email protected]>
*
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "logging.h"
#include <string.h>
#include "stringx.h"
static char *
logging_append_info(char *dest, const char *dest_end,
logging_record_t *rec_p, const char *key, int key_len)
{
/* Verify this list against the output of:
* $ cat logging_variables.txt \
* | awk '{ print length($_), $_ }' \
* | sort -n
*/
/* TODO(liulk): very low priority, rewrite the following section
* using binary search.
*/
size_t buf_size = dest_end - dest;
switch (key_len) {
case 4:
if (strncmp(key, "name", key_len) == 0)
dest = strxcpy(dest, dest_end, rec_p->name, buf_size);
break;
case 5:
if (strncmp(key, "msecs", key_len) == 0)
dest = sxprintf(dest, dest_end, "%03d", rec_p->msecs);
break;
case 6:
if (strncmp(key, "lineno", key_len) == 0)
dest = sxprintf(dest, dest_end, "%d", rec_p->lineno);
else if (strncmp(key, "thread", key_len) == 0)
dest = sxprintf(dest, dest_end, "%lu", rec_p->thread);
break;
case 7:
if (strncmp(key, "levelno", key_len) == 0)
dest = sxprintf(dest, dest_end, "%d", rec_p->levelno);
else if (strncmp(key, "created", key_len) == 0)
dest = sxprintf(dest, dest_end, "%f", rec_p->created);
else if (strncmp(key, "asctime", key_len) == 0)
dest = strxcpy(dest, dest_end, rec_p->asctime, buf_size);
else if (strncmp(key, "process", key_len) == 0)
dest = sxprintf(dest, dest_end, "%d", rec_p->process);
else if (strncmp(key, "message", key_len) == 0)
dest = vsxprintf(dest, dest_end, rec_p->msg, rec_p->ap);
break;
case 8:
if (strncmp(key, "pathname", key_len) == 0)
dest = strxcpy(dest, dest_end, rec_p->pathname, buf_size);
else if (strncmp(key, "filename", key_len) == 0)
dest = strxcpy(dest, dest_end, rec_p->filename, buf_size);
else if (strncmp(key, "funcName", key_len) == 0)
dest = strxcpy(dest, dest_end, rec_p->func_name, buf_size);
break;
case 9:
if (strncmp(key, "levelname", key_len) == 0)
dest = strxcpy(dest, dest_end, rec_p->levelname, buf_size);
break;
case 10:
if (strncmp(key, "threadName", key_len) == 0)
dest = strxcpy(dest, dest_end, rec_p->thread_name, buf_size);
break;
case 15:
if (strncmp(key, "relativeCreated", key_len) == 0)
dest = sxprintf(dest, dest_end, "%f", rec_p->relative_created);
break;
}
return dest;
}
static char *strchrnul(const char *s, int c) {
for ( ; *s != '\0'; s++)
if (*s == c)
return (char *) s;
return (char *) s;
}
size_t logging_formatter(logging_record_t *rec_p, const char *log_fmt,
char *buf, size_t buf_size)
{
/* In the format parser below, we also use buf_size liberally as a
* lose upper bound for number of bytes to copy. This does not
* cause the strx functions to overflow buffer. The variable
* dest_end is the guard that prevents overflow.
*/
const char *dest_end = buf + buf_size;
char *dest = buf;
while (dest < dest_end - 1) {
/* Copy the format string verbatim until the next occurrence of '%'. */
const char *ahead = strchrnul(log_fmt, '%');
dest = strxcpy(dest, dest_end, log_fmt, ahead - log_fmt);
if (*ahead == '\0')
break;
/* Handle format specification, somewhat Python style. We do not
* support any modifiers.
*/
log_fmt = ahead + 1;
if (*log_fmt == '\0')
break;
else if (*log_fmt == '(') {
ahead = strchrnul(log_fmt, ')');
if (ahead == '\0')
break;
const char *subject = log_fmt + 1;
int len = ahead - subject;
char type = *(ahead + 1);
if (type == 's' || type == 'd' || type == 'f') {
dest = logging_append_info(dest, dest_end, rec_p, subject, len);
ahead += 2;
} else {
/* Not a format specification. Ignore. */
dest = strxcpy(dest, dest_end, log_fmt - 1, ahead - log_fmt + 2);
ahead += 1;
}
log_fmt = ahead;
}
else {
dest = strxcpy(dest, dest_end, log_fmt, 1);
log_fmt++;
}
}
dest = strxcpy(dest, dest_end, "\n", 1);
return dest - buf;
}