source: viewwin.c @ 4d9e4254

release-1.10release-1.7release-1.8release-1.9
Last change on this file since 4d9e4254 was fe4c786, checked in by David Benjamin <davidben@mit.edu>, 14 years ago
Avoids segfault on NULL curswin for viewwin When the screen is too small, newwin() fails and gives back a NULL window. This avoids the crash.
  • Property mode set to 100644
File size: 3.9 KB
Line 
1#include <string.h>
2#include "owl.h"
3
4#define BOTTOM_OFFSET 1
5
6/* initialize the viewwin e.  'win' is an already initialzed curses
7 * window that will be used by viewwin
8 */
9void owl_viewwin_init_text(owl_viewwin *v, WINDOW *win, int winlines, int wincols, const char *text)
10{
11  owl_fmtext_init_null(&(v->fmtext));
12  if (text) {
13    owl_fmtext_append_normal(&(v->fmtext), text);
14    if (text[0] != '\0' && text[strlen(text) - 1] != '\n') {
15      owl_fmtext_append_normal(&(v->fmtext), "\n");
16    }
17    v->textlines=owl_fmtext_num_lines(&(v->fmtext));
18  }
19  v->topline=0;
20  v->rightshift=0;
21  v->winlines=winlines;
22  v->wincols=wincols;
23  v->curswin=win;
24  v->onclose_hook = NULL;
25}
26
27void owl_viewwin_append_text(owl_viewwin *v, const char *text) {
28    owl_fmtext_append_normal(&(v->fmtext), text);
29    v->textlines=owl_fmtext_num_lines(&(v->fmtext)); 
30}
31
32/* initialize the viewwin e.  'win' is an already initialzed curses
33 * window that will be used by viewwin
34 */
35void owl_viewwin_init_fmtext(owl_viewwin *v, WINDOW *win, int winlines, int wincols, const owl_fmtext *fmtext)
36{
37  char *text;
38
39  owl_fmtext_copy(&(v->fmtext), fmtext);
40  text = owl_fmtext_print_plain(fmtext);
41  if (text[0] != '\0' && text[strlen(text) - 1] != '\n') {
42      owl_fmtext_append_normal(&(v->fmtext), "\n");
43  }
44  owl_free(text);
45  v->textlines=owl_fmtext_num_lines(&(v->fmtext));
46  v->topline=0;
47  v->rightshift=0;
48  v->winlines=winlines;
49  v->wincols=wincols;
50  v->curswin=win;
51}
52
53void owl_viewwin_set_curswin(owl_viewwin *v, WINDOW *w, int winlines, int wincols)
54{
55  v->curswin=w;
56  v->winlines=winlines;
57  v->wincols=wincols;
58}
59
60void owl_viewwin_set_onclose_hook(owl_viewwin *v, void (*onclose_hook) (owl_viewwin *vwin, void *data), void *onclose_hook_data) {
61  v->onclose_hook = onclose_hook;
62  v->onclose_hook_data = onclose_hook_data;
63}
64
65/* regenerate text on the curses window. */
66void owl_viewwin_redisplay(owl_viewwin *v)
67{
68  owl_fmtext fm1, fm2;
69
70  /* avoid segfault when screen too small to create curswin */
71  if (v->curswin == NULL)
72    return;
73 
74  werase(v->curswin);
75  wmove(v->curswin, 0, 0);
76
77  owl_fmtext_init_null(&fm1);
78  owl_fmtext_init_null(&fm2);
79 
80  owl_fmtext_truncate_lines(&(v->fmtext), v->topline, v->winlines-BOTTOM_OFFSET, &fm1);
81  owl_fmtext_truncate_cols(&fm1, v->rightshift, v->wincols-1+v->rightshift, &fm2);
82
83  owl_fmtext_curs_waddstr_without_search(&fm2, v->curswin);
84
85  /* print the message at the bottom */
86  wmove(v->curswin, v->winlines-1, 0);
87  wattrset(v->curswin, A_REVERSE);
88  if (v->textlines - v->topline > v->winlines-BOTTOM_OFFSET) {
89    waddstr(v->curswin, "--More-- (Space to see more, 'q' to quit)");
90  } else {
91    waddstr(v->curswin, "--End-- (Press 'q' to quit)");
92  }
93  wattroff(v->curswin, A_REVERSE);
94
95  owl_fmtext_cleanup(&fm1);
96  owl_fmtext_cleanup(&fm2);
97}
98
99void owl_viewwin_pagedown(owl_viewwin *v)
100{
101  v->topline+=v->winlines - BOTTOM_OFFSET;
102  if ( (v->topline+v->winlines-BOTTOM_OFFSET) > v->textlines) {
103    v->topline = v->textlines - v->winlines + BOTTOM_OFFSET;
104  }
105}
106
107void owl_viewwin_linedown(owl_viewwin *v)
108{
109  v->topline++;
110  if ( (v->topline+v->winlines-BOTTOM_OFFSET) > v->textlines) {
111    v->topline = v->textlines - v->winlines + BOTTOM_OFFSET;
112  }
113}
114
115void owl_viewwin_pageup(owl_viewwin *v)
116{
117  v->topline-=v->winlines;
118  if (v->topline<0) v->topline=0;
119}
120
121void owl_viewwin_lineup(owl_viewwin *v)
122{
123  v->topline--;
124  if (v->topline<0) v->topline=0;
125}
126
127void owl_viewwin_right(owl_viewwin *v, int n)
128{
129  v->rightshift+=n;
130}
131
132void owl_viewwin_left(owl_viewwin *v, int n)
133{
134  v->rightshift-=n;
135  if (v->rightshift<0) v->rightshift=0;
136}
137
138void owl_viewwin_top(owl_viewwin *v)
139{
140  v->topline=0;
141  v->rightshift=0;
142}
143
144void owl_viewwin_bottom(owl_viewwin *v)
145{
146  v->topline = v->textlines - v->winlines + BOTTOM_OFFSET;
147}
148
149void owl_viewwin_cleanup(owl_viewwin *v)
150{
151  if (v->onclose_hook) {
152    v->onclose_hook(v, v->onclose_hook_data);
153    v->onclose_hook = NULL;
154    v->onclose_hook_data = NULL;
155  }
156  owl_fmtext_cleanup(&(v->fmtext));
157}
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