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      1 /*	$NetBSD: ctrace.c,v 1.24 2024/06/09 13:02:24 rillig Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if 0
     34 static char sccsid[] = "@(#)ctrace.c	8.2 (Berkeley) 10/5/93";
     35 #else
     36 __RCSID("$NetBSD: ctrace.c,v 1.24 2024/06/09 13:02:24 rillig Exp $");
     37 #endif
     38 
     39 #ifdef DEBUG
     40 #include <stdarg.h>
     41 #include <stdio.h>
     42 #include <stdlib.h>
     43 
     44 #include <sys/time.h>
     45 #include <string.h>
     46 
     47 #include "curses.h"
     48 #include "curses_private.h"
     49 
     50 static FILE *tracefp = NULL;		/* Curses debugging file descriptor. */
     51 
     52 static int tracemask;	/* Areas of trace output we want. */
     53 
     54 static int init_done = 0;
     55 
     56 static void
     57 __CTRACE_init(void)
     58 {
     59 	char *tf, *tm;
     60 
     61 	tm = getenv("CURSES_TRACE_MASK");
     62 	if (tm == NULL)
     63 		tracemask = __CTRACE_ALL;
     64 	else
     65 		tracemask = (int)strtol(tm, NULL, 0);
     66 	if (tracemask < 0)
     67 		tracemask = (0 - tracemask) ^ __CTRACE_ALL;
     68 	if (tracemask == 0)
     69 		return;
     70 
     71 	tf = getenv("CURSES_TRACE_FILE");
     72 
     73 	if ((tf != NULL) && !strcmp( tf, "<none>"))
     74 		tf = NULL;
     75 
     76 	if (tf != NULL)
     77 		tracefp = fopen(tf, "w");
     78 
     79 	init_done = 1;
     80 	__CTRACE(__CTRACE_ALL, "Trace mask: 0x%08x\n", tracemask);
     81 }
     82 
     83 void
     84 __CTRACE(int area, const char *fmt,...)
     85 {
     86         static int seencr = 1;
     87 	va_list ap;
     88 
     89 	if (!init_done)
     90 		__CTRACE_init();
     91 	if (tracefp == NULL || !(tracemask & area))
     92 		return;
     93 
     94         if (seencr && (tracemask & __CTRACE_TSTAMP)) {
     95 		struct timeval tv;
     96                 gettimeofday(&tv, NULL);
     97                 (void)fprintf(tracefp, "%llu.%06lu: ",
     98 		    (long long)tv.tv_sec, (long)tv.tv_usec);
     99         }
    100 	va_start(ap, fmt);
    101         (void)vfprintf(tracefp, fmt, ap);
    102         seencr = (strchr(fmt, '\n') != NULL);
    103 	va_end(ap);
    104 	(void)fflush(tracefp);
    105 }
    106 #else
    107 /* Prevent an 'empty translation unit' message from lint. */
    108 typedef int dummy;
    109 #endif
    110