Commit | Line | Data |
---|---|---|
05862919 SL |
1 | #ifndef lint |
2 | static char sccsid[] = "@(#)remcap.c 4.8 (Berkeley) %G%"; | |
4b675d70 | 3 | #endif |
ff9b62f7 | 4 | |
ff9b62f7 | 5 | /* |
3095e901 SL |
6 | * remcap - routines for dealing with the remote host data base |
7 | * | |
05862919 | 8 | * derived from termcap |
3095e901 | 9 | */ |
05862919 SL |
10 | #include <sys/file.h> |
11 | #include <ctype.h> | |
12 | ||
13 | #ifndef BUFSIZ | |
14 | #define BUFSIZ 1024 | |
15 | #endif | |
16 | #define MAXHOP 32 /* max number of tc= indirections */ | |
17 | #define SYSREMOTE "/etc/remote" /* system remote file */ | |
3095e901 | 18 | |
3095e901 SL |
19 | #define tgetent rgetent |
20 | #define tnchktc rnchktc | |
21 | #define tnamatch rnamatch | |
22 | #define tgetnum rgetnum | |
23 | #define tgetflag rgetflag | |
24 | #define tgetstr rgetstr | |
6b46907f | 25 | #define E_TERMCAP RM = SYSREMOTE |
fa7b15dc SL |
26 | #define V_TERMCAP "REMOTE" |
27 | #define V_TERM "HOST" | |
28 | ||
3095e901 | 29 | char *RM; |
3095e901 SL |
30 | |
31 | /* | |
32 | * termcap - routines for dealing with the terminal capability data base | |
ff9b62f7 BJ |
33 | * |
34 | * BUG: Should use a "last" pointer in tbuf, so that searching | |
35 | * for capabilities alphabetically would not be a n**2/2 | |
36 | * process when large numbers of capabilities are given. | |
3095e901 SL |
37 | * Note: If we add a last pointer now we will screw up the |
38 | * tc capability. We really should compile termcap. | |
ff9b62f7 BJ |
39 | * |
40 | * Essentially all the work here is scanning and decoding escapes | |
3095e901 SL |
41 | * in string capabilities. We don't use stdio because the editor |
42 | * doesn't, and because living w/o it is not hard. | |
43 | */ | |
ff9b62f7 | 44 | |
3095e901 SL |
45 | static char *tbuf; |
46 | static int hopcount; /* detect infinite loops in termcap, init 0 */ | |
47 | char *tskip(); | |
48 | char *tgetstr(); | |
49 | char *tdecode(); | |
ff9b62f7 | 50 | char *getenv(); |
05862919 | 51 | static char *remotefile; |
ff9b62f7 BJ |
52 | |
53 | /* | |
3095e901 SL |
54 | * Get an entry for terminal name in buffer bp, |
55 | * from the termcap file. Parse is very rudimentary; | |
ff9b62f7 BJ |
56 | * we just notice escaped newlines. |
57 | */ | |
3095e901 | 58 | tgetent(bp, name) |
ff9b62f7 BJ |
59 | char *bp, *name; |
60 | { | |
05862919 SL |
61 | char lbuf[BUFSIZ], *cp, *p; |
62 | int rc1, rc2; | |
6b46907f RC |
63 | |
64 | remotefile = cp = getenv(V_TERMCAP); | |
65 | if (cp == (char *)0 || strcmp(cp, SYSREMOTE) == 0) { | |
66 | remotefile = cp = SYSREMOTE; | |
05862919 | 67 | return (getent(bp, name, cp)); |
6b46907f RC |
68 | } else { |
69 | if ((rc1 = getent(bp, name, cp)) != 1) | |
70 | *bp = '\0'; | |
71 | remotefile = cp = SYSREMOTE; | |
72 | rc2 = getent(lbuf, name, cp); | |
73 | if (rc1 != 1 && rc2 != 1) | |
05862919 | 74 | return (rc2); |
6b46907f RC |
75 | if (rc2 == 1) { |
76 | p = lbuf; | |
77 | if (rc1 == 1) | |
78 | while (*p++ != ':') | |
79 | ; | |
80 | if (strlen(bp) + strlen(p) > BUFSIZ) { | |
81 | write(2, "Remcap entry too long\n", 23); | |
05862919 | 82 | return (-1); |
6b46907f RC |
83 | } |
84 | strcat(bp, p); | |
85 | } | |
86 | tbuf = bp; | |
05862919 | 87 | return (1); |
6b46907f RC |
88 | } |
89 | } | |
90 | ||
91 | getent(bp, name, cp) | |
92 | char *bp, *name, *cp; | |
93 | { | |
ff9b62f7 BJ |
94 | register int c; |
95 | register int i = 0, cnt = 0; | |
05862919 | 96 | char ibuf[BUFSIZ], *cp2; |
ff9b62f7 BJ |
97 | int tf; |
98 | ||
3095e901 SL |
99 | tbuf = bp; |
100 | tf = 0; | |
3095e901 SL |
101 | /* |
102 | * TERMCAP can have one of two things in it. It can be the | |
103 | * name of a file to use instead of /etc/termcap. In this | |
104 | * case it better start with a "/". Or it can be an entry to | |
105 | * use so we don't have to read the file. In this case it | |
106 | * has to already have the newlines crunched out. | |
107 | */ | |
108 | if (cp && *cp) { | |
109 | if (*cp!='/') { | |
fa7b15dc | 110 | cp2 = getenv(V_TERM); |
05862919 | 111 | if (cp2 == (char *)0 || strcmp(name,cp2) == 0) { |
3095e901 | 112 | strcpy(bp,cp); |
05862919 SL |
113 | return (tnchktc()); |
114 | } else | |
115 | tf = open(E_TERMCAP, O_RDONLY); | |
3095e901 | 116 | } else |
05862919 | 117 | tf = open(RM = cp, O_RDONLY); |
3095e901 | 118 | } |
05862919 SL |
119 | if (tf == 0) |
120 | tf = open(E_TERMCAP, O_RDONLY); | |
3095e901 | 121 | if (tf < 0) |
ff9b62f7 BJ |
122 | return (-1); |
123 | for (;;) { | |
124 | cp = bp; | |
125 | for (;;) { | |
126 | if (i == cnt) { | |
127 | cnt = read(tf, ibuf, BUFSIZ); | |
128 | if (cnt <= 0) { | |
129 | close(tf); | |
130 | return (0); | |
131 | } | |
132 | i = 0; | |
133 | } | |
134 | c = ibuf[i++]; | |
135 | if (c == '\n') { | |
6b46907f | 136 | if (cp > bp && cp[-1] == '\\') { |
ff9b62f7 BJ |
137 | cp--; |
138 | continue; | |
139 | } | |
140 | break; | |
141 | } | |
3095e901 | 142 | if (cp >= bp+BUFSIZ) { |
6b46907f | 143 | write(2,"Remcap entry too long\n", 23); |
3095e901 SL |
144 | break; |
145 | } else | |
146 | *cp++ = c; | |
ff9b62f7 BJ |
147 | } |
148 | *cp = 0; | |
149 | ||
150 | /* | |
151 | * The real work for the match. | |
152 | */ | |
3095e901 | 153 | if (tnamatch(name)) { |
ff9b62f7 | 154 | close(tf); |
05862919 | 155 | return (tnchktc()); |
3095e901 SL |
156 | } |
157 | } | |
158 | } | |
159 | ||
160 | /* | |
161 | * tnchktc: check the last entry, see if it's tc=xxx. If so, | |
162 | * recursively find xxx and append that entry (minus the names) | |
163 | * to take the place of the tc=xxx entry. This allows termcap | |
164 | * entries to say "like an HP2621 but doesn't turn on the labels". | |
165 | * Note that this works because of the left to right scan. | |
166 | */ | |
167 | tnchktc() | |
168 | { | |
169 | register char *p, *q; | |
170 | char tcname[16]; /* name of similar terminal */ | |
171 | char tcbuf[BUFSIZ]; | |
172 | char *holdtbuf = tbuf; | |
173 | int l; | |
6b46907f | 174 | char *cp; |
3095e901 SL |
175 | |
176 | p = tbuf + strlen(tbuf) - 2; /* before the last colon */ | |
177 | while (*--p != ':') | |
178 | if (p<tbuf) { | |
6b46907f | 179 | write(2, "Bad remcap entry\n", 18); |
3095e901 | 180 | return (0); |
ff9b62f7 | 181 | } |
3095e901 SL |
182 | p++; |
183 | /* p now points to beginning of last field */ | |
184 | if (p[0] != 't' || p[1] != 'c') | |
05862919 | 185 | return (1); |
6b46907f | 186 | strcpy(tcname, p+3); |
3095e901 | 187 | q = tcname; |
6b46907f | 188 | while (*q && *q != ':') |
3095e901 SL |
189 | q++; |
190 | *q = 0; | |
191 | if (++hopcount > MAXHOP) { | |
192 | write(2, "Infinite tc= loop\n", 18); | |
193 | return (0); | |
194 | } | |
6b46907f RC |
195 | if (getent(tcbuf, tcname, remotefile) != 1) { |
196 | if (strcmp(remotefile, SYSREMOTE) == 0) | |
05862919 | 197 | return (0); |
6b46907f | 198 | else if (getent(tcbuf, tcname, SYSREMOTE) != 1) |
05862919 | 199 | return (0); |
6b46907f RC |
200 | } |
201 | for (q = tcbuf; *q++ != ':'; ) | |
3095e901 SL |
202 | ; |
203 | l = p - holdtbuf + strlen(q); | |
204 | if (l > BUFSIZ) { | |
6b46907f RC |
205 | write(2, "Remcap entry too long\n", 23); |
206 | q[BUFSIZ - (p-holdtbuf)] = 0; | |
ff9b62f7 | 207 | } |
6b46907f | 208 | strcpy(p, q); |
3095e901 | 209 | tbuf = holdtbuf; |
05862919 | 210 | return (1); |
ff9b62f7 BJ |
211 | } |
212 | ||
213 | /* | |
3095e901 | 214 | * Tnamatch deals with name matching. The first field of the termcap |
ff9b62f7 BJ |
215 | * entry is a sequence of names separated by |'s, so we compare |
216 | * against each such name. The normal : terminator after the last | |
217 | * name (before the first field) stops us. | |
218 | */ | |
3095e901 | 219 | tnamatch(np) |
ff9b62f7 BJ |
220 | char *np; |
221 | { | |
222 | register char *Np, *Bp; | |
223 | ||
3095e901 SL |
224 | Bp = tbuf; |
225 | if (*Bp == '#') | |
05862919 | 226 | return (0); |
ff9b62f7 BJ |
227 | for (;;) { |
228 | for (Np = np; *Np && *Bp == *Np; Bp++, Np++) | |
229 | continue; | |
230 | if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0)) | |
231 | return (1); | |
232 | while (*Bp && *Bp != ':' && *Bp != '|') | |
233 | Bp++; | |
234 | if (*Bp == 0 || *Bp == ':') | |
235 | return (0); | |
236 | Bp++; | |
237 | } | |
238 | } | |
239 | ||
240 | /* | |
241 | * Skip to the next field. Notice that this is very dumb, not | |
242 | * knowing about \: escapes or any such. If necessary, :'s can be put | |
3095e901 | 243 | * into the termcap file in octal. |
ff9b62f7 BJ |
244 | */ |
245 | static char * | |
3095e901 | 246 | tskip(bp) |
ff9b62f7 BJ |
247 | register char *bp; |
248 | { | |
249 | ||
250 | while (*bp && *bp != ':') | |
251 | bp++; | |
252 | if (*bp == ':') | |
253 | bp++; | |
254 | return (bp); | |
255 | } | |
256 | ||
257 | /* | |
258 | * Return the (numeric) option id. | |
259 | * Numeric options look like | |
260 | * li#80 | |
261 | * i.e. the option string is separated from the numeric value by | |
262 | * a # character. If the option is not found we return -1. | |
263 | * Note that we handle octal numbers beginning with 0. | |
264 | */ | |
3095e901 | 265 | tgetnum(id) |
ff9b62f7 BJ |
266 | char *id; |
267 | { | |
268 | register int i, base; | |
3095e901 | 269 | register char *bp = tbuf; |
ff9b62f7 BJ |
270 | |
271 | for (;;) { | |
3095e901 | 272 | bp = tskip(bp); |
ff9b62f7 BJ |
273 | if (*bp == 0) |
274 | return (-1); | |
275 | if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1]) | |
276 | continue; | |
3095e901 | 277 | if (*bp == '@') |
05862919 | 278 | return (-1); |
ff9b62f7 BJ |
279 | if (*bp != '#') |
280 | continue; | |
281 | bp++; | |
282 | base = 10; | |
283 | if (*bp == '0') | |
284 | base = 8; | |
285 | i = 0; | |
286 | while (isdigit(*bp)) | |
287 | i *= base, i += *bp++ - '0'; | |
288 | return (i); | |
289 | } | |
290 | } | |
291 | ||
292 | /* | |
293 | * Handle a flag option. | |
294 | * Flag options are given "naked", i.e. followed by a : or the end | |
295 | * of the buffer. Return 1 if we find the option, or 0 if it is | |
296 | * not given. | |
297 | */ | |
3095e901 | 298 | tgetflag(id) |
ff9b62f7 BJ |
299 | char *id; |
300 | { | |
3095e901 | 301 | register char *bp = tbuf; |
ff9b62f7 BJ |
302 | |
303 | for (;;) { | |
3095e901 | 304 | bp = tskip(bp); |
ff9b62f7 BJ |
305 | if (!*bp) |
306 | return (0); | |
3095e901 SL |
307 | if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) { |
308 | if (!*bp || *bp == ':') | |
309 | return (1); | |
310 | else if (*bp == '@') | |
05862919 | 311 | return (0); |
3095e901 | 312 | } |
ff9b62f7 BJ |
313 | } |
314 | } | |
315 | ||
316 | /* | |
317 | * Get a string valued option. | |
318 | * These are given as | |
319 | * cl=^Z | |
320 | * Much decoding is done on the strings, and the strings are | |
321 | * placed in area, which is a ref parameter which is updated. | |
322 | * No checking on area overflow. | |
323 | */ | |
324 | char * | |
3095e901 | 325 | tgetstr(id, area) |
ff9b62f7 BJ |
326 | char *id, **area; |
327 | { | |
3095e901 | 328 | register char *bp = tbuf; |
ff9b62f7 BJ |
329 | |
330 | for (;;) { | |
3095e901 | 331 | bp = tskip(bp); |
ff9b62f7 BJ |
332 | if (!*bp) |
333 | return (0); | |
334 | if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1]) | |
335 | continue; | |
3095e901 | 336 | if (*bp == '@') |
05862919 | 337 | return (0); |
ff9b62f7 BJ |
338 | if (*bp != '=') |
339 | continue; | |
340 | bp++; | |
3095e901 | 341 | return (tdecode(bp, area)); |
ff9b62f7 BJ |
342 | } |
343 | } | |
344 | ||
345 | /* | |
346 | * Tdecode does the grung work to decode the | |
347 | * string capability escapes. | |
348 | */ | |
3095e901 SL |
349 | static char * |
350 | tdecode(str, area) | |
ff9b62f7 BJ |
351 | register char *str; |
352 | char **area; | |
353 | { | |
354 | register char *cp; | |
355 | register int c; | |
356 | register char *dp; | |
357 | int i; | |
358 | ||
359 | cp = *area; | |
360 | while ((c = *str++) && c != ':') { | |
361 | switch (c) { | |
362 | ||
363 | case '^': | |
364 | c = *str++ & 037; | |
365 | break; | |
366 | ||
367 | case '\\': | |
368 | dp = "E\033^^\\\\::n\nr\rt\tb\bf\f"; | |
369 | c = *str++; | |
370 | nextc: | |
371 | if (*dp++ == c) { | |
372 | c = *dp++; | |
373 | break; | |
374 | } | |
375 | dp++; | |
376 | if (*dp) | |
377 | goto nextc; | |
378 | if (isdigit(c)) { | |
379 | c -= '0', i = 2; | |
380 | do | |
381 | c <<= 3, c |= *str++ - '0'; | |
382 | while (--i && isdigit(*str)); | |
383 | } | |
384 | break; | |
385 | } | |
386 | *cp++ = c; | |
387 | } | |
388 | *cp++ = 0; | |
389 | str = *area; | |
390 | *area = cp; | |
391 | return (str); | |
392 | } |