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28 
29 /****************************************************************************
30  *  Author: Thomas E. Dickey                 1997-on                        *
31  ****************************************************************************/
32 /*
33  *	trace_buf.c - Tracing/Debugging buffers (attributes)
34  */
35 
36 #include <curses.priv.h>
37 
38 MODULE_ID("$Id: trace_buf.c,v 1.20 2012/02/22 22:34:31 tom Exp $")
39 
40 #ifdef TRACE
41 
42 #define MyList _nc_globals.tracebuf_ptr
43 #define MySize _nc_globals.tracebuf_used
44 
45 static char *
46 _nc_trace_alloc(int bufnum, size_t want)
47 {
48     char *result = 0;
49 
50     if (bufnum >= 0) {
51 	if ((size_t) (bufnum + 1) > MySize) {
52 	    size_t need = (size_t) (bufnum + 1) * 2;
53 	    if ((MyList = typeRealloc(TRACEBUF, need, MyList)) != 0) {
54 		while (need > MySize)
55 		    MyList[MySize++].text = 0;
56 	    }
57 	}
58 
59 	if (MyList != 0) {
60 	    if (MyList[bufnum].text == 0
61 		|| want > MyList[bufnum].size) {
62 		MyList[bufnum].text = typeRealloc(char, want, MyList[bufnum].text);
63 		if (MyList[bufnum].text != 0)
64 		    MyList[bufnum].size = want;
65 	    }
66 	    result = MyList[bufnum].text;
67 	}
68     }
69 #if NO_LEAKS
70     else {
71 	if (MySize) {
72 	    if (MyList) {
73 		while (MySize--) {
74 		    if (MyList[MySize].text != 0) {
75 			free(MyList[MySize].text);
76 		    }
77 		}
78 		free(MyList);
79 		MyList = 0;
80 	    }
81 	    MySize = 0;
82 	}
83     }
84 #endif
85     return result;
86 }
87 
88 /*
89  * (re)Allocate a buffer big enough for the caller's wants.
90  */
91 NCURSES_EXPORT(char *)
92 _nc_trace_buf(int bufnum, size_t want)
93 {
94     char *result = _nc_trace_alloc(bufnum, want);
95     if (result != 0)
96 	*result = '\0';
97     return result;
98 }
99 
100 /*
101  * Append a new string to an existing buffer.
102  */
103 NCURSES_EXPORT(char *)
104 _nc_trace_bufcat(int bufnum, const char *value)
105 {
106     char *buffer = _nc_trace_alloc(bufnum, (size_t) 0);
107     if (buffer != 0) {
108 	size_t have = strlen(buffer);
109 	size_t need = strlen(value) + have;
110 
111 	buffer = _nc_trace_alloc(bufnum, 1 + need);
112 	if (buffer != 0)
113 	    _nc_STRCPY(buffer + have, value, need);
114 
115     }
116     return buffer;
117 }
118 #else
119 EMPTY_MODULE(_nc_empty_trace_buf)
120 #endif /* TRACE */
121