clog.c


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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "clog.h"

#define TIMESTRLEN 20

int lprintf(const char *format, ...)
{
	va_list ap;
	va_start(ap, format);

	int n = vlprintf(format, ap);

	va_end(ap);
	return n;
}

int vlprintf(const char *format, va_list ap)
{
	time_t timer = time(NULL);
	struct tm *tm_info = localtime(&timer);

	char buf[TIMESTRLEN];
	strftime(buf, TIMESTRLEN, "%Y/%m/%d %H:%M:%S", tm_info);
	free(tm_info);

	int n = printf("%s ", buf);

	size_t fmtlen = strlen(format) + 2;
	char fmt[fmtlen];

	memset(fmt, '\0', fmtlen);
	strcpy(fmt, format);
	strcat(fmt, "\n");

	n += vprintf(format, ap);
	return n;
}