ncurses 4.2
[ncurses.git] / ncurses / trace / trace_buf.c
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28
29 /****************************************************************************
30  *  Author: Thomas E. Dickey <dickey@clark.net> 1997                        *
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 1.7 1999/02/27 19:50:58 tom Exp $")
39
40 typedef struct {
41         char *text;
42         size_t size;
43 } LIST;
44
45 char * _nc_trace_buf(int bufnum, size_t want)
46 {
47         static LIST *list;
48         static size_t have;
49
50 #if NO_LEAKS
51         if (bufnum < 0) {
52                 if (have) {
53                         while (have--) {
54                                 free(list[have].text);
55                         }
56                         free(list);
57                 }
58                 return 0;
59         }
60 #endif
61
62         if ((size_t)(bufnum+1) > have) {
63                 size_t need = (bufnum + 1) * 2;
64                 if ((list = typeRealloc(LIST, need, list)) == 0)
65                         return(0);
66                 while (need > have)
67                         list[have++].text = 0;
68         }
69
70         if (list[bufnum].text == 0
71          || want > list[bufnum].size)
72         {
73                 if ((list[bufnum].text = typeRealloc(char, want, list[bufnum].text)) != 0)
74                         list[bufnum].size = want;
75         }
76
77         if (list[bufnum].text != 0)
78                 *(list[bufnum].text) = '\0';
79         return list[bufnum].text;
80 }