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