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35f72e44 | 1 | #ifndef lint |
6069ad71 | 2 | static char sccsid[] = "@(#)dis.c 1.2 (Berkeley) %G%"; |
35f72e44 SL |
3 | #endif |
4 | ||
5 | /* | |
6 | ** Dis -- VDU page display program | |
7 | ** | |
8 | ** "dis [-t<timeout>] [-c<refresh count>] [-u]" | |
9 | ** | |
10 | ** Bugs and comments to: Piers Lauder | |
11 | ** Dept of Comp Sci | |
12 | ** Sydney University | |
13 | ** May '80. | |
14 | */ | |
15 | ||
35f72e44 SL |
16 | #include <signal.h> |
17 | #include <setjmp.h> | |
18 | #include <sgtty.h> | |
19 | #include <stdio.h> | |
20 | ||
21 | /* | |
22 | ** Parameters | |
23 | */ | |
24 | ||
25 | #define MAXWID 132 | |
26 | #define MAXLEN 80 | |
27 | ||
28 | ||
29 | /* | |
30 | ** Screen buffer | |
31 | */ | |
32 | ||
33 | char * Buf; | |
34 | ||
35 | /* | |
36 | ** Term Cap | |
37 | */ | |
38 | ||
39 | char *CM, *CL; | |
40 | short amflag; | |
41 | ||
42 | extern short ospeed; | |
43 | extern char PC, *BC, *UP; | |
44 | ||
45 | extern char * tgoto(); | |
46 | extern char * tgetstr(); | |
47 | ||
48 | /* | |
49 | ** Screen macro | |
50 | */ | |
51 | ||
52 | #define putcm(cp,p,c) if(*cp++!=c){\ | |
53 | if(move((--cp)-p))\ | |
54 | putc(c,stdout);\ | |
55 | *cp++=c;\ | |
56 | } | |
57 | ||
58 | /* | |
59 | ** Miscellaneous | |
60 | */ | |
61 | ||
62 | jmp_buf alrmbuf; | |
63 | short width; | |
64 | short Width; /* width - 1 */ | |
65 | short length; | |
66 | short Length; /* length - 1 */ | |
67 | char * name; | |
68 | unsigned timeout; | |
69 | short rcount; | |
70 | ||
71 | void | |
72 | tcinit(), | |
73 | dis(), | |
74 | warn(), | |
75 | terror(), | |
76 | outc(); | |
77 | ||
78 | int alrmcatch(); | |
79 | ||
80 | /* | |
81 | ** Externals | |
82 | */ | |
83 | ||
84 | extern char _sobuf[]; | |
85 | extern char * tgetstr(); | |
86 | extern char * malloc(); | |
87 | extern char * getenv(); | |
88 | ||
89 | ||
90 | ||
91 | main(argc, argv) | |
92 | register int argc; | |
93 | register char * argv[]; | |
94 | { | |
95 | register char * cp; | |
96 | register unsigned size; | |
97 | ||
98 | name = *argv++; | |
99 | argc--; | |
100 | ||
101 | while ( argc ) | |
102 | { | |
103 | switch( argv[0][0] ) | |
104 | { | |
105 | case '-': argv[0]++; | |
106 | continue; | |
107 | case 't': timeout = atoi(&argv[0][1]); | |
108 | break; | |
109 | case 'c': rcount = atoi(&argv[0][1]); | |
110 | break; | |
111 | case 'u': setbuf(stdin, NULL); | |
112 | break; | |
113 | default: fprintf(stderr, "%s: bad arg - %s\n", name, argv[0] ); | |
114 | return 1; | |
115 | } | |
116 | argc--; | |
117 | argv++; | |
118 | } | |
119 | ||
120 | setbuf(stdout, _sobuf); | |
121 | tcinit(); | |
122 | size = length * width; | |
123 | if ( (Buf = malloc(size)) == (char *)0 ) | |
124 | { | |
125 | fprintf(stderr, "No memory\n"); | |
126 | exit(2); | |
127 | } | |
128 | bzero(Buf, size); | |
129 | ||
130 | Length = length - 1; | |
131 | Width = width - 1; | |
132 | dis(size); | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | ||
138 | ||
139 | ||
140 | void | |
141 | dis(size) | |
142 | unsigned size; | |
143 | { | |
144 | register char * ep; | |
145 | register char * p = Buf; | |
146 | register int c; | |
147 | register int line; | |
148 | /** on stack to avoid setjmp **/ | |
149 | char * cp; | |
150 | char * lastend; | |
151 | int rc; | |
152 | ||
153 | lastend = p; | |
154 | rc = rcount; | |
155 | ||
156 | do | |
157 | { | |
158 | line = 0; | |
159 | cp = p; | |
160 | ep = cp+width; | |
161 | ||
162 | if ( timeout == 0 || setjmp(alrmbuf) == 0 ) | |
163 | { | |
164 | if ( timeout ) | |
165 | { | |
166 | signal(SIGALRM, alrmcatch); | |
167 | alarm(timeout); | |
168 | } | |
169 | while ( (c = getchar()) != EOF ) | |
170 | { | |
171 | if ( rcount && !rc ) | |
172 | { | |
173 | tputs(CL, 1, outc); | |
174 | bzero(p, size); | |
175 | rc = rcount; | |
176 | } | |
177 | if ( c < ' ' ) | |
178 | { | |
179 | switch ( c ) | |
180 | { | |
181 | case '\f': if ( cp != p ) | |
182 | break; | |
183 | continue; | |
184 | case '\t': c = cp - &p[line*width] + 1; | |
185 | putcm(cp, p, ' '); | |
186 | while ( c++&7 ) | |
187 | putcm(cp, p, ' '); | |
188 | continue; | |
189 | case '\n': while ( cp < ep ) | |
190 | putcm(cp, p, ' '); | |
191 | if ( line < Length ) | |
192 | { | |
193 | cp = &p[(++line)*width]; | |
194 | ep = cp+width; | |
195 | } | |
196 | continue; | |
197 | default: | |
198 | if ( cp < ep ) | |
199 | putcm(cp, p, '?'); | |
200 | continue; | |
201 | } | |
202 | } | |
203 | else | |
204 | { | |
205 | if ( cp < ep ) | |
206 | putcm(cp, p, c); | |
207 | continue; | |
208 | } | |
209 | break; | |
210 | } | |
211 | if ( timeout ) | |
212 | alarm(0); | |
213 | } | |
214 | ep = cp - 1; | |
215 | while ( cp < lastend ) | |
216 | putcm(cp, p, ' '); | |
217 | lastend = ep; | |
218 | if ( (line = (ep-p)/width) < Length ) | |
219 | line++; | |
220 | (void)move(line*width); | |
221 | fflush(stdout); | |
222 | if ( rcount ) | |
223 | --rc; | |
224 | } | |
225 | while | |
226 | ( c != EOF ); | |
227 | } | |
228 | ||
229 | ||
230 | ||
231 | ||
232 | int | |
233 | move(pos) | |
234 | register int pos; | |
235 | { | |
236 | register int x = pos%width; | |
237 | register int y = pos/width; | |
238 | register int i; | |
239 | static int oy, ox = -1; | |
240 | ||
241 | if ( oy == y ) | |
242 | { | |
243 | if ( (i = x - ox) != 1 ) | |
244 | if ( i <= 3 && i > 0 ) | |
245 | { | |
246 | i--; | |
247 | pos -= i; | |
248 | do | |
249 | putc(Buf[pos++], stdout); | |
250 | while | |
251 | ( --i > 0 ); | |
252 | } | |
253 | else | |
254 | tputs(tgoto(CM, x, y), 1, outc); | |
255 | } | |
256 | else | |
257 | if ( oy == (y-1) && x == 0 ) | |
258 | { | |
259 | if ( ox != Width || !amflag ) | |
260 | putc('\n', stdout); | |
261 | } | |
262 | else | |
263 | tputs(tgoto(CM, x, y), oy<y?y-oy:oy-y, outc); | |
264 | ||
265 | ox = x; oy = y; | |
266 | if ( y==Length && x==Width && amflag ) | |
267 | return 0; | |
268 | return 1; | |
269 | } | |
270 | ||
271 | ||
272 | ||
273 | ||
274 | int | |
275 | alrmcatch() | |
276 | { | |
277 | longjmp(alrmbuf, 1); | |
278 | } | |
279 | ||
280 | ||
281 | ||
282 | ||
283 | void | |
284 | tcinit() | |
285 | { | |
286 | register char * cp; | |
287 | struct sgttyb gb; | |
288 | char bp[1024]; | |
289 | static char buf[100]; | |
290 | char *area = buf; | |
291 | ||
292 | if ( tgetent(bp, getenv("TERM")) != 1 ) | |
293 | terror("no \"termcap\" entry"); | |
294 | if ( (CL = tgetstr("cl", &area)) == (char *)0 ) | |
295 | terror("not VDU"); | |
296 | if ( (CM = tgetstr("cm", &area)) == (char *)0 ) | |
297 | terror("no cursor addressing"); | |
298 | UP = tgetstr("up", &area); | |
299 | BC = tgetstr("bc", &area); | |
300 | if ( tgetflag("am") == 1 ) | |
301 | amflag++; | |
302 | if ( (cp = getenv("WIDTH")) != (char *)0 ) | |
303 | width = atoi(cp); | |
304 | else | |
305 | width = tgetnum("co"); | |
306 | if ( width > MAXWID ) | |
307 | { | |
308 | width = MAXWID; | |
309 | warn("width truncated"); | |
310 | } | |
311 | if ( (length = tgetnum("li")) > MAXLEN ) | |
312 | { | |
313 | length = MAXLEN; | |
314 | warn("length truncated"); | |
315 | } | |
316 | if ( (cp = tgetstr("pc", &area)) != (char *)0 ) | |
317 | PC = *cp; | |
318 | gtty(1, &gb); | |
319 | ospeed = gb.sg_ospeed; | |
320 | ||
321 | tputs(CL, 1, outc); | |
322 | fflush(stdout); | |
323 | } | |
324 | ||
325 | ||
326 | ||
327 | ||
328 | void | |
329 | outc(c) | |
330 | { | |
331 | putc(c, stdout); | |
332 | } | |
333 | ||
334 | ||
335 | ||
336 | ||
337 | void | |
338 | warn(s) | |
339 | char * s; | |
340 | { | |
341 | fprintf(stderr, "Warning: %s\n", s); | |
342 | sleep(2); | |
343 | } | |
344 | ||
345 | ||
346 | ||
347 | ||
348 | void | |
349 | terror(s) | |
350 | char * s; | |
351 | { | |
352 | fprintf(stderr, "Terminal capability error - %s\n", s); | |
353 | exit(1); | |
354 | } |