/*	$OpenBSD: lib_trace.c,v 1.3 2000/01/09 05:06:02 millert Exp $	*/

/****************************************************************************
 * Copyright (c) 1998-2000 Free Software Foundation, Inc.                   *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/

/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 ****************************************************************************/

/*
 *	lib_trace.c - Tracing/Debugging routines
 */

#include <curses.priv.h>
#include <tic.h>

#include <ctype.h>

MODULE_ID("$From: lib_trace.c,v 1.32 2000/01/08 17:37:04 tom Exp $")

unsigned _nc_tracing = 0;	/* always define this */

#ifdef TRACE
const char *_nc_tputs_trace = "";
long _nc_outchars = 0;

static FILE *tracefp;		/* default to writing to stderr */
#endif

void
trace(const unsigned int tracelevel GCC_UNUSED)
{
#ifdef TRACE
    static bool been_here = FALSE;
    static char my_name[] = "trace";

    _nc_tracing = tracelevel;
    if (!been_here && tracelevel) {
	been_here = TRUE;

	if (_nc_access(my_name, W_OK) < 0
	    || (tracefp = fopen(my_name, "w")) == 0) {
	    perror("curses: Can't open 'trace' file: ");
	    exit(EXIT_FAILURE);
	}
	/* Try to set line-buffered mode, or (failing that) unbuffered,
	 * so that the trace-output gets flushed automatically at the
	 * end of each line.  This is useful in case the program dies. 
	 */
#if HAVE_SETVBUF		/* ANSI */
	(void) setvbuf(tracefp, (char *) 0, _IOLBF, 0);
#elif HAVE_SETBUF		/* POSIX */
	(void) setbuffer(tracefp, (char *) 0);
#endif
	_tracef("TRACING NCURSES version %s (%d)",
	    NCURSES_VERSION, NCURSES_VERSION_PATCH);
    }
#endif
}

const char *
_nc_visbuf2(int bufnum, const char *buf)
/* visibilize a given string */
{
    char *vbuf;
    char *tp;
    int c;

    if (buf == 0)
	return ("(null)");
    if (buf == CANCELLED_STRING)
	return ("(cancelled)");

    tp = vbuf = _nc_trace_buf(bufnum, (strlen(buf) * 4) + 5);
    *tp++ = '"';
    while ((c = *buf++) != '\0') {
	if (c == '"') {
	    *tp++ = '\\';
	    *tp++ = '"';
	} else if (is7bits(c) && (isgraph(c) || c == ' ')) {
	    *tp++ = c;
	} else if (c == '\n') {
	    *tp++ = '\\';
	    *tp++ = 'n';
	} else if (c == '\r') {
	    *tp++ = '\\';
	    *tp++ = 'r';
	} else if (c == '\b') {
	    *tp++ = '\\';
	    *tp++ = 'b';
	} else if (c == '\033') {
	    *tp++ = '\\';
	    *tp++ = 'e';
	} else if (is7bits(c) && iscntrl(c)) {
	    *tp++ = '\\';
	    *tp++ = '^';
	    *tp++ = '@' + c;
	} else {
	    sprintf(tp, "\\%03o", c & 0xff);
	    tp += strlen(tp);
	}
    }
    *tp++ = '"';
    *tp++ = '\0';
    return (vbuf);
}

const char *
_nc_visbuf(const char *buf)
{
    return _nc_visbuf2(0, buf);
}

#ifdef TRACE
void
_tracef(const char *fmt,...)
{
    static const char Called[] = T_CALLED("");
    static const char Return[] = T_RETURN("");
    static int level;
    va_list ap;
    bool before = FALSE;
    bool after = FALSE;
    int doit = _nc_tracing;
    int save_err = errno;

    if (strlen(fmt) >= sizeof(Called) - 1) {
	if (!strncmp(fmt, Called, sizeof(Called) - 1)) {
	    before = TRUE;
	    level++;
	} else if (!strncmp(fmt, Return, sizeof(Return) - 1)) {
	    after = TRUE;
	}
	if (before || after) {
	    if ((level <= 1)
		|| (doit & TRACE_ICALLS) != 0)
		doit &= (TRACE_CALLS | TRACE_CCALLS);
	    else
		doit = 0;
	}
    }

    if (doit != 0) {
	if (tracefp == 0)
	    tracefp = stderr;
	if (before || after) {
	    int n;
	    for (n = 1; n < level; n++)
		fputs("+ ", tracefp);
	}
	va_start(ap, fmt);
	vfprintf(tracefp, fmt, ap);
	fputc('\n', tracefp);
	va_end(ap);
	fflush(tracefp);
    }

    if (after && level)
	level--;
    errno = save_err;
}

/* Trace 'int' return-values */
int
_nc_retrace_int(int code)
{
    T((T_RETURN("%d"), code));
    return code;
}

/* Trace 'char*' return-values */
char *
_nc_retrace_ptr(char *code)
{
    T((T_RETURN("%s"), _nc_visbuf(code)));
    return code;
}

/* Trace 'WINDOW *' return-values */
WINDOW *
_nc_retrace_win(WINDOW *code)
{
    T((T_RETURN("%p"), code));
    return code;
}
#endif /* TRACE */