1
0
mirror of https://github.com/pevans/erc-c.git synced 2024-07-17 03:29:10 +00:00
erc-c/src/log.c

88 lines
1.7 KiB
C

/*
* log.c
*
* The functions here support our logging mechanism.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "log.h"
/*
* This is the file stream we will write to for our logging. It can be
* any number of things, from a literal file on the filesystem, to
* stdout.
*/
static FILE *_stream = NULL;
/*
* Close the file stream we opened (or were given) in `log_open()`.
* Nota bene: if you passed stdout into log_open(), this will actually
* _close_ the stdout stream (!).
*/
int
log_close()
{
int rval = 0;
if (_stream != NULL) {
rval = fclose(_stream);
_stream = NULL;
}
return rval;
}
/*
* This function will assign the _stream variable to either a given
* file stream, or if none given, to the default location (which is a
* filename defined by the `LOG_FILENAME` macro).
*/
void
log_open(FILE *stream)
{
// Oh, you're telling _me_ what the stream is? Neat!
if (stream != NULL) {
_stream = stream;
return;
}
// Oh, well. I'll just open this dang thing.
_stream = fopen(LOG_FILENAME, "w");
if (_stream == NULL) {
perror("Couldn't open log file (" LOG_FILENAME ")");
exit(1);
}
}
/*
* Write to the log stream. This function can accept variable arguments,
* ala `printf()`. There is some support for different log levels, but
* as you may note, we do not use them at present.
*/
void
log_write(int level, const char *fmt, ...)
{
va_list ap;
if (_stream == NULL) {
_stream = stdout;
}
va_start(ap, fmt);
vfprintf(_stream, fmt, ap);
fprintf(_stream, "\n");
va_end(ap);
}
/*
* Return the file stream we're currently using for logging.
*/
FILE *
log_stream()
{
return _stream;
}