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1 | /* |
2 | * Copyright (c) 1988 Mark Nudleman | |
3 | * Copyright (c) 1988 Regents of the University of California. | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * 3. All advertising materials mentioning features or use of this software | |
15 | * must display the following acknowledgement: | |
16 | * This product includes software developed by the University of | |
17 | * California, Berkeley and its contributors. | |
18 | * 4. Neither the name of the University nor the names of its contributors | |
19 | * may be used to endorse or promote products derived from this software | |
20 | * without specific prior written permission. | |
21 | * | |
22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
32 | * SUCH DAMAGE. | |
33 | */ | |
34 | ||
35 | #ifndef lint | |
36 | static char sccsid[] = "@(#)output.c 5.10 (Berkeley) 7/24/91"; | |
37 | #endif /* not lint */ | |
38 | ||
39 | /* | |
40 | * High level routines dealing with the output to the screen. | |
41 | */ | |
42 | ||
43 | #include <stdio.h> | |
44 | #include <less.h> | |
45 | ||
46 | int errmsgs; /* Count of messages displayed by error() */ | |
47 | ||
48 | extern int sigs; | |
49 | extern int sc_width, sc_height; | |
50 | extern int ul_width, ue_width; | |
51 | extern int so_width, se_width; | |
52 | extern int bo_width, be_width; | |
53 | extern int tabstop; | |
54 | extern int screen_trashed; | |
55 | extern int any_display; | |
56 | extern char *line; | |
57 | ||
58 | /* display the line which is in the line buffer. */ | |
59 | put_line() | |
60 | { | |
61 | register char *p; | |
62 | register int c; | |
63 | register int column; | |
64 | extern int auto_wrap, ignaw; | |
65 | ||
66 | if (sigs) | |
67 | { | |
68 | /* | |
69 | * Don't output if a signal is pending. | |
70 | */ | |
71 | screen_trashed = 1; | |
72 | return; | |
73 | } | |
74 | ||
75 | if (line == NULL) | |
76 | line = ""; | |
77 | ||
78 | column = 0; | |
79 | for (p = line; *p != '\0'; p++) | |
80 | { | |
81 | switch (c = *p) | |
82 | { | |
83 | case UL_CHAR: | |
84 | ul_enter(); | |
e3364dda | 85 | column += ul_width; /* +1; XXX */ |
2ec5f51d NW |
86 | break; |
87 | case UE_CHAR: | |
88 | ul_exit(); | |
89 | column += ue_width; | |
90 | break; | |
91 | case BO_CHAR: | |
92 | bo_enter(); | |
e3364dda | 93 | column += bo_width; /* +1; XXX */ |
2ec5f51d NW |
94 | break; |
95 | case BE_CHAR: | |
96 | bo_exit(); | |
97 | column += be_width; | |
98 | break; | |
99 | case '\t': | |
100 | do | |
101 | { | |
102 | putchr(' '); | |
103 | column++; | |
104 | } while ((column % tabstop) != 0); | |
105 | break; | |
106 | case '\b': | |
107 | putbs(); | |
108 | column--; | |
109 | break; | |
110 | default: | |
111 | if (c & 0200) | |
112 | { | |
113 | /* | |
114 | * Control characters arrive here as the | |
115 | * normal character [CARAT_CHAR(c)] with | |
116 | * the 0200 bit set. See pappend(). | |
117 | */ | |
118 | putchr('^'); | |
119 | putchr(c & 0177); | |
120 | column += 2; | |
121 | } else | |
122 | { | |
123 | putchr(c); | |
124 | column++; | |
125 | } | |
126 | } | |
127 | } | |
128 | if (column < sc_width || !auto_wrap || ignaw) | |
129 | putchr('\n'); | |
130 | } | |
131 | ||
132 | static char obuf[1024]; | |
133 | static char *ob = obuf; | |
134 | ||
135 | /* | |
136 | * Flush buffered output. | |
137 | */ | |
138 | flush() | |
139 | { | |
140 | register int n; | |
141 | ||
142 | n = ob - obuf; | |
143 | if (n == 0) | |
144 | return; | |
145 | if (write(1, obuf, n) != n) | |
146 | screen_trashed = 1; | |
147 | ob = obuf; | |
148 | } | |
149 | ||
150 | /* | |
151 | * Purge any pending output. | |
152 | */ | |
153 | purge() | |
154 | { | |
155 | ||
156 | ob = obuf; | |
157 | } | |
158 | ||
159 | /* | |
160 | * Output a character. | |
161 | */ | |
162 | putchr(c) | |
163 | int c; | |
164 | { | |
165 | if (ob >= &obuf[sizeof(obuf)]) | |
166 | flush(); | |
167 | *ob++ = c; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Output a string. | |
172 | */ | |
173 | putstr(s) | |
174 | register char *s; | |
175 | { | |
176 | while (*s != '\0') | |
177 | putchr(*s++); | |
178 | } | |
179 | ||
180 | int cmdstack; | |
181 | static char return_to_continue[] = "(press RETURN)"; | |
182 | ||
183 | /* | |
184 | * Output a message in the lower left corner of the screen | |
185 | * and wait for carriage return. | |
186 | */ | |
187 | error(s) | |
188 | char *s; | |
189 | { | |
190 | int ch; | |
191 | ||
192 | ++errmsgs; | |
193 | if (!any_display) { | |
194 | /* | |
195 | * Nothing has been displayed yet. Output this message on | |
196 | * error output (file descriptor 2) and don't wait for a | |
197 | * keystroke to continue. | |
198 | * | |
199 | * This has the desirable effect of producing all error | |
200 | * messages on error output if standard output is directed | |
201 | * to a file. It also does the same if we never produce | |
202 | * any real output; for example, if the input file(s) cannot | |
203 | * be opened. If we do eventually produce output, code in | |
204 | * edit() makes sure these messages can be seen before they | |
205 | * are overwritten or scrolled away. | |
206 | */ | |
207 | (void)write(2, s, strlen(s)); | |
208 | (void)write(2, "\n", 1); | |
209 | return; | |
210 | } | |
211 | ||
212 | lower_left(); | |
213 | clear_eol(); | |
214 | so_enter(); | |
215 | if (s) { | |
216 | putstr(s); | |
217 | putstr(" "); | |
218 | } | |
219 | putstr(return_to_continue); | |
220 | so_exit(); | |
221 | ||
222 | if ((ch = getchr()) != '\n') { | |
223 | if (ch == 'q') | |
224 | quit(); | |
225 | cmdstack = ch; | |
226 | } | |
227 | lower_left(); | |
228 | ||
229 | if (strlen(s) + sizeof(return_to_continue) + | |
230 | so_width + se_width + 1 > sc_width) | |
231 | /* | |
232 | * Printing the message has probably scrolled the screen. | |
233 | * {{ Unless the terminal doesn't have auto margins, | |
234 | * in which case we just hammered on the right margin. }} | |
235 | */ | |
9368ffc5 AM |
236 | /* repaint(); */ |
237 | screen_trashed = 1; /* XXX */ | |
2ec5f51d NW |
238 | flush(); |
239 | } | |
240 | ||
241 | static char intr_to_abort[] = "... (interrupt to abort)"; | |
242 | ||
243 | ierror(s) | |
244 | char *s; | |
245 | { | |
246 | lower_left(); | |
247 | clear_eol(); | |
248 | so_enter(); | |
249 | putstr(s); | |
250 | putstr(intr_to_abort); | |
251 | so_exit(); | |
252 | flush(); | |
253 | } |