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35f72e44 SL |
1 | #ifndef lint |
2 | static char sccsid[] = "@(#)dis.c 1.1 (Berkeley) %G%"; | |
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 | ||
16 | /* | |
17 | #include <local-system> | |
18 | */ | |
19 | #include <signal.h> | |
20 | #include <setjmp.h> | |
21 | #include <sgtty.h> | |
22 | #include <stdio.h> | |
23 | ||
24 | /* | |
25 | ** Parameters | |
26 | */ | |
27 | ||
28 | #define MAXWID 132 | |
29 | #define MAXLEN 80 | |
30 | ||
31 | ||
32 | /* | |
33 | ** Screen buffer | |
34 | */ | |
35 | ||
36 | char * Buf; | |
37 | ||
38 | /* | |
39 | ** Term Cap | |
40 | */ | |
41 | ||
42 | char *CM, *CL; | |
43 | short amflag; | |
44 | ||
45 | extern short ospeed; | |
46 | extern char PC, *BC, *UP; | |
47 | ||
48 | extern char * tgoto(); | |
49 | extern char * tgetstr(); | |
50 | ||
51 | /* | |
52 | ** Screen macro | |
53 | */ | |
54 | ||
55 | #define putcm(cp,p,c) if(*cp++!=c){\ | |
56 | if(move((--cp)-p))\ | |
57 | putc(c,stdout);\ | |
58 | *cp++=c;\ | |
59 | } | |
60 | ||
61 | /* | |
62 | ** Miscellaneous | |
63 | */ | |
64 | ||
65 | jmp_buf alrmbuf; | |
66 | short width; | |
67 | short Width; /* width - 1 */ | |
68 | short length; | |
69 | short Length; /* length - 1 */ | |
70 | char * name; | |
71 | unsigned timeout; | |
72 | short rcount; | |
73 | ||
74 | void | |
75 | tcinit(), | |
76 | dis(), | |
77 | warn(), | |
78 | terror(), | |
79 | outc(); | |
80 | ||
81 | int alrmcatch(); | |
82 | ||
83 | /* | |
84 | ** Externals | |
85 | */ | |
86 | ||
87 | extern char _sobuf[]; | |
88 | extern char * tgetstr(); | |
89 | extern char * malloc(); | |
90 | extern char * getenv(); | |
91 | ||
92 | ||
93 | ||
94 | main(argc, argv) | |
95 | register int argc; | |
96 | register char * argv[]; | |
97 | { | |
98 | register char * cp; | |
99 | register unsigned size; | |
100 | ||
101 | name = *argv++; | |
102 | argc--; | |
103 | ||
104 | while ( argc ) | |
105 | { | |
106 | switch( argv[0][0] ) | |
107 | { | |
108 | case '-': argv[0]++; | |
109 | continue; | |
110 | case 't': timeout = atoi(&argv[0][1]); | |
111 | break; | |
112 | case 'c': rcount = atoi(&argv[0][1]); | |
113 | break; | |
114 | case 'u': setbuf(stdin, NULL); | |
115 | break; | |
116 | default: fprintf(stderr, "%s: bad arg - %s\n", name, argv[0] ); | |
117 | return 1; | |
118 | } | |
119 | argc--; | |
120 | argv++; | |
121 | } | |
122 | ||
123 | setbuf(stdout, _sobuf); | |
124 | tcinit(); | |
125 | size = length * width; | |
126 | if ( (Buf = malloc(size)) == (char *)0 ) | |
127 | { | |
128 | fprintf(stderr, "No memory\n"); | |
129 | exit(2); | |
130 | } | |
131 | bzero(Buf, size); | |
132 | ||
133 | Length = length - 1; | |
134 | Width = width - 1; | |
135 | dis(size); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | ||
141 | ||
142 | ||
143 | void | |
144 | dis(size) | |
145 | unsigned size; | |
146 | { | |
147 | register char * ep; | |
148 | register char * p = Buf; | |
149 | register int c; | |
150 | register int line; | |
151 | /** on stack to avoid setjmp **/ | |
152 | char * cp; | |
153 | char * lastend; | |
154 | int rc; | |
155 | ||
156 | lastend = p; | |
157 | rc = rcount; | |
158 | ||
159 | do | |
160 | { | |
161 | line = 0; | |
162 | cp = p; | |
163 | ep = cp+width; | |
164 | ||
165 | if ( timeout == 0 || setjmp(alrmbuf) == 0 ) | |
166 | { | |
167 | if ( timeout ) | |
168 | { | |
169 | signal(SIGALRM, alrmcatch); | |
170 | alarm(timeout); | |
171 | } | |
172 | while ( (c = getchar()) != EOF ) | |
173 | { | |
174 | if ( rcount && !rc ) | |
175 | { | |
176 | tputs(CL, 1, outc); | |
177 | bzero(p, size); | |
178 | rc = rcount; | |
179 | } | |
180 | if ( c < ' ' ) | |
181 | { | |
182 | switch ( c ) | |
183 | { | |
184 | case '\f': if ( cp != p ) | |
185 | break; | |
186 | continue; | |
187 | case '\t': c = cp - &p[line*width] + 1; | |
188 | putcm(cp, p, ' '); | |
189 | while ( c++&7 ) | |
190 | putcm(cp, p, ' '); | |
191 | continue; | |
192 | case '\n': while ( cp < ep ) | |
193 | putcm(cp, p, ' '); | |
194 | if ( line < Length ) | |
195 | { | |
196 | cp = &p[(++line)*width]; | |
197 | ep = cp+width; | |
198 | } | |
199 | continue; | |
200 | default: | |
201 | if ( cp < ep ) | |
202 | putcm(cp, p, '?'); | |
203 | continue; | |
204 | } | |
205 | } | |
206 | else | |
207 | { | |
208 | if ( cp < ep ) | |
209 | putcm(cp, p, c); | |
210 | continue; | |
211 | } | |
212 | break; | |
213 | } | |
214 | if ( timeout ) | |
215 | alarm(0); | |
216 | } | |
217 | ep = cp - 1; | |
218 | while ( cp < lastend ) | |
219 | putcm(cp, p, ' '); | |
220 | lastend = ep; | |
221 | if ( (line = (ep-p)/width) < Length ) | |
222 | line++; | |
223 | (void)move(line*width); | |
224 | fflush(stdout); | |
225 | if ( rcount ) | |
226 | --rc; | |
227 | } | |
228 | while | |
229 | ( c != EOF ); | |
230 | } | |
231 | ||
232 | ||
233 | ||
234 | ||
235 | int | |
236 | move(pos) | |
237 | register int pos; | |
238 | { | |
239 | register int x = pos%width; | |
240 | register int y = pos/width; | |
241 | register int i; | |
242 | static int oy, ox = -1; | |
243 | ||
244 | if ( oy == y ) | |
245 | { | |
246 | if ( (i = x - ox) != 1 ) | |
247 | if ( i <= 3 && i > 0 ) | |
248 | { | |
249 | i--; | |
250 | pos -= i; | |
251 | do | |
252 | putc(Buf[pos++], stdout); | |
253 | while | |
254 | ( --i > 0 ); | |
255 | } | |
256 | else | |
257 | tputs(tgoto(CM, x, y), 1, outc); | |
258 | } | |
259 | else | |
260 | if ( oy == (y-1) && x == 0 ) | |
261 | { | |
262 | if ( ox != Width || !amflag ) | |
263 | putc('\n', stdout); | |
264 | } | |
265 | else | |
266 | tputs(tgoto(CM, x, y), oy<y?y-oy:oy-y, outc); | |
267 | ||
268 | ox = x; oy = y; | |
269 | if ( y==Length && x==Width && amflag ) | |
270 | return 0; | |
271 | return 1; | |
272 | } | |
273 | ||
274 | ||
275 | ||
276 | ||
277 | int | |
278 | alrmcatch() | |
279 | { | |
280 | longjmp(alrmbuf, 1); | |
281 | } | |
282 | ||
283 | ||
284 | ||
285 | ||
286 | void | |
287 | tcinit() | |
288 | { | |
289 | register char * cp; | |
290 | struct sgttyb gb; | |
291 | char bp[1024]; | |
292 | static char buf[100]; | |
293 | char *area = buf; | |
294 | ||
295 | if ( tgetent(bp, getenv("TERM")) != 1 ) | |
296 | terror("no \"termcap\" entry"); | |
297 | if ( (CL = tgetstr("cl", &area)) == (char *)0 ) | |
298 | terror("not VDU"); | |
299 | if ( (CM = tgetstr("cm", &area)) == (char *)0 ) | |
300 | terror("no cursor addressing"); | |
301 | UP = tgetstr("up", &area); | |
302 | BC = tgetstr("bc", &area); | |
303 | if ( tgetflag("am") == 1 ) | |
304 | amflag++; | |
305 | if ( (cp = getenv("WIDTH")) != (char *)0 ) | |
306 | width = atoi(cp); | |
307 | else | |
308 | width = tgetnum("co"); | |
309 | if ( width > MAXWID ) | |
310 | { | |
311 | width = MAXWID; | |
312 | warn("width truncated"); | |
313 | } | |
314 | if ( (length = tgetnum("li")) > MAXLEN ) | |
315 | { | |
316 | length = MAXLEN; | |
317 | warn("length truncated"); | |
318 | } | |
319 | if ( (cp = tgetstr("pc", &area)) != (char *)0 ) | |
320 | PC = *cp; | |
321 | gtty(1, &gb); | |
322 | ospeed = gb.sg_ospeed; | |
323 | ||
324 | tputs(CL, 1, outc); | |
325 | fflush(stdout); | |
326 | } | |
327 | ||
328 | ||
329 | ||
330 | ||
331 | void | |
332 | outc(c) | |
333 | { | |
334 | putc(c, stdout); | |
335 | } | |
336 | ||
337 | ||
338 | ||
339 | ||
340 | void | |
341 | warn(s) | |
342 | char * s; | |
343 | { | |
344 | fprintf(stderr, "Warning: %s\n", s); | |
345 | sleep(2); | |
346 | } | |
347 | ||
348 | ||
349 | ||
350 | ||
351 | void | |
352 | terror(s) | |
353 | char * s; | |
354 | { | |
355 | fprintf(stderr, "Terminal capability error - %s\n", s); | |
356 | exit(1); | |
357 | } |