source: rtems-libbsd/rtemsbsd/rtems/syslog.c @ d5eac12

/**
 * @file
 *
 * @ingroup rtems_bsd_rtems
 *
 * @brief TODO.
 */

/*
 * Copyright (c) 2014 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Dornierstr. 4
 *  82178 Puchheim
 *  Germany
 *  <rtems@embedded-brains.de>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <machine/rtems-bsd-user-space.h>
#include <machine/rtems-bsd-program.h>

#include <syslog.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>

typedef struct {
  int mask;
} rtems_bsd_syslog_context;

/* FIXME: This should be thread specific */
static rtems_bsd_syslog_context rtems_bsd_syslog_instance = {
        .mask = LOG_UPTO(LOG_DEBUG)
};

static const char * const rtems_bsd_syslog_priorities[] = {
        [LOG_EMERG] = "emerg",
        [LOG_ALERT] = "alert",
        [LOG_CRIT] = "crit",
        [LOG_ERR] = "err",
        [LOG_WARNING] = "warning",
        [LOG_NOTICE] = "notice",
        [LOG_INFO] = "info",
        [LOG_DEBUG] = "debug"
};

static rtems_bsd_syslog_context *
rtems_bsd_syslog_get_context(void)
{
        return &rtems_bsd_syslog_instance;
}

static void
rtems_bsd_syslog_format_buffer_overflow(void)
{
        fputs("err: syslog: format buffer overflow\n", stderr);
}

void
syslog(int priority, const char *format, ...)
{
        va_list ap;

        va_start(ap, format);
        vsyslog(priority, format, ap);
        va_end(ap);
}

void
vsyslog(int priority, const char *format, va_list ap)
{
        rtems_bsd_syslog_context *ctx = rtems_bsd_syslog_get_context();
        int pri = LOG_PRI(priority);
        char fmt[128];
        char buf[128];
        const char *src;
        char *dst;
        size_t rem;
        char *m;
        int n;
        size_t len;

        if ((LOG_MASK(pri) & ctx->mask) == 0) {
                return;
        }

        /* Expand the %m in the format string and add a newline character */

        src = format;
        dst = &fmt[0];
        rem = sizeof(fmt) - 2;

        while ((m = strstr(src, "%m")) != NULL) {
                size_t c = m - src;

                if (c > rem) {
                        rtems_bsd_syslog_format_buffer_overflow();
                        return;
                }

                memcpy(dst, src, c);
                dst += c;
                src += c + 2;
                rem -= c;

                n = sniprintf(dst, rem, "%s", strerror(errno));
                if (n > rem || n < 0) {
                        rtems_bsd_syslog_format_buffer_overflow();
                        return;
                }

                dst += (size_t) n;
                rem -= (size_t) n;
        }

        len = strlen(src);
        if (len > rem) {
                rtems_bsd_syslog_format_buffer_overflow();
                return;
        }

        memcpy(dst, src, len);
        dst += len;
        dst[0] = '\n';
        dst[1] = '\0';

        /* Print into buffer */

        dst = &buf[0];
        rem = sizeof(buf) - 1;

        n = sniprintf(dst, rem, "%s: ", rtems_bsd_syslog_priorities[pri]);
        if (n <= rem) {
                dst += (size_t) n;
                rem -= (size_t) n;
        }

        n = sniprintf(dst, rem, "%s: ", rtems_bsd_program_get_name());
        if (n <= rem) {
                dst += (size_t) n;
                rem -= (size_t) n;
        }

        vsniprintf(dst, rem, &fmt[0], ap);

        /* Write in one rush */

        fputs(&buf[0], stderr);
}

void
openlog(const char *ident, int option, int facility)
{
        /* TODO */
}

void
closelog(void)
{
        /* TODO */
}

int
setlogmask(int mask)
{
        rtems_bsd_syslog_context *ctx = rtems_bsd_syslog_get_context();
        int cur = ctx->mask;

        ctx->mask = mask & LOG_UPTO(LOG_DEBUG);

        return cur;
}