1 /****************************************************************************
2  * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
3  *                                                                          *
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5  * copy of this software and associated documentation files (the            *
6  * "Software"), to deal in the Software without restriction, including      *
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9  * copies of the Software, and to permit persons to whom the Software is    *
10  * furnished to do so, subject to the following conditions:                 *
11  *                                                                          *
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14  *                                                                          *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22  *                                                                          *
23  * Except as contained in this notice, the name(s) of the above copyright   *
24  * holders shall not be used in advertising or otherwise to promote the     *
25  * sale, use or other dealings in this Software without prior written       *
26  * authorization.                                                           *
27  ****************************************************************************/
28 
29 /****************************************************************************
30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
32  *     and: Thomas E. Dickey                        1996-on                 *
33  ****************************************************************************/
34 
35 /*
36  *	lib_trace.c - Tracing/Debugging routines
37  *
38  * The _tracef() function is originally from pcurses (by Pavel Curtis) in 1982.
39  * pcurses allowed one to enable/disable tracing using traceon() and traceoff()
40  * functions.  ncurses provides a trace() function which allows one to
41  * selectively enable or disable several tracing features.
42  */
43 
44 #include <curses.priv.h>
45 #include <tic.h>
46 
47 #include <ctype.h>
48 
49 MODULE_ID("$Id: lib_trace.c,v 1.71 2008/08/23 18:04:29 tom Exp $")
50 
51 NCURSES_EXPORT_VAR(unsigned) _nc_tracing = 0; /* always define this */
52 
53 #ifdef TRACE
54 
55 #if USE_REENTRANT
56 NCURSES_EXPORT(const char *)
57 NCURSES_PUBLIC_VAR(_nc_tputs_trace) (void)
58 {
59     return SP ? SP->_tputs_trace : _nc_prescreen._tputs_trace;
60 }
61 NCURSES_EXPORT(long)
62 NCURSES_PUBLIC_VAR(_nc_outchars) (void)
63 {
64     return SP ? SP->_outchars : _nc_prescreen._outchars;
65 }
66 NCURSES_EXPORT(void)
67 _nc_set_tputs_trace(const char *s)
68 {
69     if (SP)
70 	SP->_tputs_trace = s;
71     else
72 	_nc_prescreen._tputs_trace = s;
73 }
74 NCURSES_EXPORT(void)
75 _nc_count_outchars(long increment)
76 {
77     if (SP)
78 	SP->_outchars += increment;
79     else
80 	_nc_prescreen._outchars += increment;
81 }
82 #else
83 NCURSES_EXPORT_VAR(const char *) _nc_tputs_trace = "";
84 NCURSES_EXPORT_VAR(long) _nc_outchars = 0;
85 #endif
86 
87 #define TraceFP		_nc_globals.trace_fp
88 #define TracePath	_nc_globals.trace_fname
89 #define TraceLevel	_nc_globals.trace_level
90 
91 NCURSES_EXPORT(void)
92 trace(const unsigned int tracelevel)
93 {
94     if ((TraceFP == 0) && tracelevel) {
95 	const char *mode = _nc_globals.init_trace ? "ab" : "wb";
96 
97 	if (TracePath[0] == '\0') {
98 	    int size = sizeof(TracePath) - 12;
99 	    if (getcwd(TracePath, size) == 0) {
100 		perror("curses: Can't get working directory");
101 		exit(EXIT_FAILURE);
102 	    }
103 	    TracePath[size] = '\0';
104 	    assert(strlen(TracePath) <= size);
105 	    strcat(TracePath, "/trace");
106 	    if (_nc_is_dir_path(TracePath)) {
107 		strcat(TracePath, ".log");
108 	    }
109 	}
110 
111 	_nc_globals.init_trace = TRUE;
112 	_nc_tracing = tracelevel;
113 	if (_nc_access(TracePath, W_OK) < 0
114 	    || (TraceFP = fopen(TracePath, mode)) == 0) {
115 	    perror("curses: Can't open 'trace' file");
116 	    exit(EXIT_FAILURE);
117 	}
118 	/* Try to set line-buffered mode, or (failing that) unbuffered,
119 	 * so that the trace-output gets flushed automatically at the
120 	 * end of each line.  This is useful in case the program dies.
121 	 */
122 #if HAVE_SETVBUF		/* ANSI */
123 	(void) setvbuf(TraceFP, (char *) 0, _IOLBF, 0);
124 #elif HAVE_SETBUF		/* POSIX */
125 	(void) setbuffer(TraceFP, (char *) 0);
126 #endif
127 	_tracef("TRACING NCURSES version %s.%d (tracelevel=%#x)",
128 		NCURSES_VERSION,
129 		NCURSES_VERSION_PATCH,
130 		tracelevel);
131     } else if (tracelevel == 0) {
132 	if (TraceFP != 0) {
133 	    fclose(TraceFP);
134 	    TraceFP = 0;
135 	}
136 	_nc_tracing = tracelevel;
137     } else if (_nc_tracing != tracelevel) {
138 	_nc_tracing = tracelevel;
139 	_tracef("tracelevel=%#x", tracelevel);
140     }
141 }
142 
143 static void
144 _nc_va_tracef(const char *fmt, va_list ap)
145 {
146     static const char Called[] = T_CALLED("");
147     static const char Return[] = T_RETURN("");
148 
149     bool before = FALSE;
150     bool after = FALSE;
151     unsigned doit = _nc_tracing;
152     int save_err = errno;
153 
154     if (strlen(fmt) >= sizeof(Called) - 1) {
155 	if (!strncmp(fmt, Called, sizeof(Called) - 1)) {
156 	    before = TRUE;
157 	    TraceLevel++;
158 	} else if (!strncmp(fmt, Return, sizeof(Return) - 1)) {
159 	    after = TRUE;
160 	}
161 	if (before || after) {
162 	    if ((TraceLevel <= 1)
163 		|| (doit & TRACE_ICALLS) != 0)
164 		doit &= (TRACE_CALLS | TRACE_CCALLS);
165 	    else
166 		doit = 0;
167 	}
168     }
169 
170     if (doit != 0) {
171 	if (TraceFP == 0)
172 	    TraceFP = stderr;
173 #ifdef USE_PTHREADS
174 	/*
175 	 * TRACE_ICALLS is "really" needed to show normal use with threaded
176 	 * applications, since anything can be running during a napms(),
177 	 * making it appear in the hierarchical trace as it other functions
178 	 * are being called.
179 	 *
180 	 * Rather than add the complication of a per-thread stack, just
181 	 * show the thread-id in each line of the trace.
182 	 */
183 # if USE_WEAK_SYMBOLS
184 	if ((pthread_self))
185 # endif
186 	    fprintf(TraceFP, "%#lx:", (long) (void *) pthread_self());
187 #endif
188 	if (before || after) {
189 	    int n;
190 	    for (n = 1; n < TraceLevel; n++)
191 		fputs("+ ", TraceFP);
192 	}
193 	vfprintf(TraceFP, fmt, ap);
194 	fputc('\n', TraceFP);
195 	fflush(TraceFP);
196     }
197 
198     if (after && TraceLevel)
199 	TraceLevel--;
200 
201     errno = save_err;
202 }
203 
204 NCURSES_EXPORT(void)
205 _tracef(const char *fmt,...)
206 {
207     va_list ap;
208 
209     va_start(ap, fmt);
210     _nc_va_tracef(fmt, ap);
211     va_end(ap);
212 }
213 
214 /* Trace 'bool' return-values */
215 NCURSES_EXPORT(NCURSES_BOOL)
216 _nc_retrace_bool(NCURSES_BOOL code)
217 {
218     T((T_RETURN("%s"), code ? "TRUE" : "FALSE"));
219     return code;
220 }
221 
222 /* Trace 'int' return-values */
223 NCURSES_EXPORT(int)
224 _nc_retrace_int(int code)
225 {
226     T((T_RETURN("%d"), code));
227     return code;
228 }
229 
230 /* Trace 'unsigned' return-values */
231 NCURSES_EXPORT(unsigned)
232 _nc_retrace_unsigned(unsigned code)
233 {
234     T((T_RETURN("%#x"), code));
235     return code;
236 }
237 
238 /* Trace 'char*' return-values */
239 NCURSES_EXPORT(char *)
240 _nc_retrace_ptr(char *code)
241 {
242     T((T_RETURN("%s"), _nc_visbuf(code)));
243     return code;
244 }
245 
246 /* Trace 'const char*' return-values */
247 NCURSES_EXPORT(const char *)
248 _nc_retrace_cptr(const char *code)
249 {
250     T((T_RETURN("%s"), _nc_visbuf(code)));
251     return code;
252 }
253 
254 /* Trace 'NCURSES_CONST void*' return-values */
255 NCURSES_EXPORT(NCURSES_CONST void *)
256 _nc_retrace_cvoid_ptr(NCURSES_CONST void *code)
257 {
258     T((T_RETURN("%p"), code));
259     return code;
260 }
261 
262 /* Trace 'void*' return-values */
263 NCURSES_EXPORT(void *)
264 _nc_retrace_void_ptr(void *code)
265 {
266     T((T_RETURN("%p"), code));
267     return code;
268 }
269 
270 /* Trace 'SCREEN *' return-values */
271 NCURSES_EXPORT(SCREEN *)
272 _nc_retrace_sp(SCREEN *code)
273 {
274     T((T_RETURN("%p"), code));
275     return code;
276 }
277 
278 /* Trace 'WINDOW *' return-values */
279 NCURSES_EXPORT(WINDOW *)
280 _nc_retrace_win(WINDOW *code)
281 {
282     T((T_RETURN("%p"), code));
283     return code;
284 }
285 
286 #if USE_REENTRANT
287 /*
288  * Check if the given trace-mask is enabled.
289  *
290  * This function may be called from within one of the functions that fills
291  * in parameters for _tracef(), but in that case we do not want to lock the
292  * mutex, since it is already locked.
293  */
294 NCURSES_EXPORT(int)
295 _nc_use_tracef(unsigned mask)
296 {
297     bool result = FALSE;
298 
299     _nc_lock_global(tst_tracef);
300     if (!_nc_globals.nested_tracef++) {
301 	if ((result = (_nc_tracing & (mask))) != 0
302 	    && _nc_try_global(tracef) == 0) {
303 	    /* we will call _nc_locked_tracef(), no nesting so far */
304 	} else {
305 	    /* we will not call _nc_locked_tracef() */
306 	    _nc_globals.nested_tracef = 0;
307 	}
308     } else {
309 	/* we may call _nc_locked_tracef(), but with nested_tracef > 0 */
310 	result = (_nc_tracing & (mask));
311     }
312     _nc_unlock_global(tst_tracef);
313     return result;
314 }
315 
316 /*
317  * We call this if _nc_use_tracef() returns true, which means we must unlock
318  * the tracef mutex.
319  */
320 NCURSES_EXPORT(void)
321 _nc_locked_tracef(const char *fmt,...)
322 {
323     va_list ap;
324 
325     va_start(ap, fmt);
326     _nc_va_tracef(fmt, ap);
327     va_end(ap);
328 
329     if (--(_nc_globals.nested_tracef) == 0)
330 	_nc_unlock_global(tracef);
331 }
332 #endif /* USE_REENTRANT */
333 
334 #endif /* TRACE */
335