klog.c

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/*
 * Copyright (c) 2006 Josef Cejka
 * Copyright (c) 2006 Jakub Vana
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <libc.h>
#include <str.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <io/klog.h>
#include <io/printf_core.h>

size_t klog_write(const void *buf, size_t size)
{
        ssize_t ret = (ssize_t) __SYSCALL3(SYS_KLOG, 1, (sysarg_t) buf, size);
        
        if (ret >= 0)
                return (size_t) ret;
        
        return 0;
}

void klog_update(void)
{
        (void) __SYSCALL3(SYS_KLOG, 1, (uintptr_t) NULL, 0);
}

int klog_printf(const char *fmt, ...)
{
        va_list args;
        va_start(args, fmt);
        
        int ret = klog_vprintf(fmt, args);
        
        va_end(args);
        
        return ret;
}

static int klog_vprintf_str_write(const char *str, size_t size, void *data)
{
        size_t wr = klog_write(str, size);
        return str_nlength(str, wr);
}

static int klog_vprintf_wstr_write(const wchar_t *str, size_t size, void *data)
{
        size_t offset = 0;
        size_t chars = 0;
        
        while (offset < size) {
                char buf[STR_BOUNDS(1)];
                size_t sz = 0;
                
                if (chr_encode(str[chars], buf, &sz, STR_BOUNDS(1)) == EOK)
                        klog_write(buf, sz);
                
                chars++;
                offset += sizeof(wchar_t);
        }
        
        return chars;
}

int klog_vprintf(const char *fmt, va_list ap)
{
        printf_spec_t ps = {
                klog_vprintf_str_write,
                klog_vprintf_wstr_write,
                NULL
        };
        
        return printf_core(fmt, &ps, ap);
}

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