lib_trace.c

ncurses-5.4

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 * Copyright (c) 1998-2002,2003 Free Software Foundation, Inc.              *
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 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
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 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
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 * in all copies or substantial portions of the Software.                   *
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/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <[e-mail]> 1992,1995               *
 *     and: Eric S. Raymond <[e-mail]>                         *
 ****************************************************************************/

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

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

#include <ctype.h>

MODULE_ID("$Id: lib_trace.c,v 1.53 2003/11/23 00:39:30 tom Exp $")

NCURSES_EXPORT_VAR(unsigned) _nc_tracing = 0;	/* always define this */

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

static FILE *tracefp = 0;	/* default to writing to stderr */

NCURSES_EXPORT(void)
trace(const unsigned int tracelevel)
{
    static bool been_here = FALSE;
    static char my_name[PATH_MAX];

    if ((tracefp == 0) && tracelevel) {
	const char *mode = been_here ? "ab" : "wb";

	if (*my_name == '\0') {
	    if (getcwd(my_name, sizeof(my_name) - 10) == 0) {
		perror("curses: Can't get working directory");
		exit(EXIT_FAILURE);
	    }
	    strcat(my_name, "/trace");
	}

	been_here = TRUE;
	_nc_tracing = tracelevel;
	if (_nc_access(my_name, W_OK) < 0
	    || (tracefp = fopen(my_name, mode)) == 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 (tracelevel=%#x)",
		NCURSES_VERSION,
		NCURSES_VERSION_PATCH,
		tracelevel);
    } else if (tracelevel == 0) {
	if (tracefp != 0) {
	    fclose(tracefp);
	    tracefp = 0;
	}
	_nc_tracing = tracelevel;
    } else if (_nc_tracing != tracelevel) {
	_nc_tracing = tracelevel;
	_tracef("tracelevel=%#x", tracelevel);
    }
}

NCURSES_EXPORT(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 'bool' return-values */
NCURSES_EXPORT(NCURSES_BOOL)
_nc_retrace_bool(NCURSES_BOOL code)
{
    T((T_RETURN("%s"), code ? "TRUE" : "FALSE"));
    return code;
}

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

/* Trace 'unsigned' return-values */
NCURSES_EXPORT(unsigned)
_nc_retrace_unsigned(unsigned code)
{
    T((T_RETURN("%#x"), code));
    return code;
}

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

/* Trace 'SCREEN *' return-values */
NCURSES_EXPORT(SCREEN *)
_nc_retrace_sp(SCREEN * code)
{
    T((T_RETURN("%p"), code));
    return code;
}

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