/*      $OpenBSD: log.c,v 1.47 2015/11/05 09:48:21 nicm Exp $   */
/*
 * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
 * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
 * All rights reserved.
 *
 * 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. 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 ``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 <errno.h>
#include <stdlib.h>
#include <string.h>

#include "cvs.h"

extern char *__progname;

/*
 * cvs_log()
 *
 * Log the format-string message
 * The <fmt> argument should not have a terminating newline, as this is taken
 * care of by the logging facility.
 */
void
cvs_log(u_int level, const char *fmt, ...)
{
        va_list vap;

        va_start(vap, fmt);
        cvs_vlog(level, fmt, vap);
        va_end(vap);
}

/*
 * cvs_vlog()
 *
 * The <fmt> argument should not have a terminating newline, as this is taken
 * care of by the logging facility.
 */
void
cvs_vlog(u_int level, const char *fmt, va_list vap)
{
        int ecp;
        FILE *out;
        char *cmdname;

        if (cvs_trace != 1 && level == LP_TRACE)
                return;

        if (level == LP_ERRNO)
                ecp = errno;
        else
                ecp = 0;

        if (level == LP_NOTICE)
                out = stdout;
        else
                out = stderr;

        if (cvs_server_active) {
                if (out == stdout)
                        putc('M', out);
                else {
                        out = stdout;
                        putc('E', out);
                }

                putc(' ', out);
        }

        cmdname = (cmdp != NULL) ? cmdp->cmd_name : __progname;

        /* The cvs program appends the command name to the program name */
        if (level == LP_TRACE) {
                if (cvs_server_active)
                        putc('S', out);
                else
                        putc('C', out);
                (void)fputs("-> ", out);
        } else if (level != LP_RCS) {
                (void)fputs(__progname, out);
                putc(' ', out);
                if (level == LP_ABORT)
                        (void)fprintf(out,
                            "[%s aborted]", cmdname);
                else
                        (void)fputs(cmdname, out);
                (void)fputs(": ", out);
        }

        (void)vfprintf(out, fmt, vap);
        if (level == LP_ERRNO) {
                (void)fprintf(out, ": %s\n", strerror(ecp));

                /* preserve it just in case we changed it? */
                errno = ecp;
        } else
                fputc('\n', out);
}

/*
 * cvs_printf()
 *
 * Wrapper function around printf() that prepends a 'M' command when
 * the program is acting as server.
 */
int
cvs_printf(const char *fmt, ...)
{
        static int send_m = 1;
        int ret;
        char *nstr, *dp, *sp;
        va_list vap;

        va_start(vap, fmt);

        ret = vasprintf(&nstr, fmt, vap);
        if (ret == -1)
                fatal("cvs_printf: could not allocate memory");

        for (dp = nstr; *dp != '\0';) {
                sp = strchr(dp, '\n');
                if (sp == NULL)
                        for (sp = dp; *sp != '\0'; sp++)
                                ;

                if (cvs_server_active && send_m) {
                        send_m = 0;
                        putc('M', stdout);
                        putc(' ', stdout);
                }

                if (dp != nstr && dp != sp &&
                    !strncmp(dp, LOG_REVSEP, sp - dp))
                        putc('>', stdout);

                fwrite(dp, sizeof(char), (size_t)(sp - dp), stdout);

                if (*sp != '\n')
                        break;

                putc('\n', stdout);
                send_m = 1;
                dp = sp + 1;
        }

        free(nstr);
        va_end(vap);

        return (ret);
}