Mercurial > vim
annotate src/termlib.c @ 19081:3b1f83fdaabc v8.2.0101
patch 8.2.0101: crash when passing null object to ":echomsg"
Commit: https://github.com/vim/vim/commit/9db2afe46d3208775d1c3075bbee073a17f8fdc6
Author: Bram Moolenaar <Bram@vim.org>
Date: Wed Jan 8 18:56:20 2020 +0100
patch 8.2.0101: crash when passing null object to ":echomsg"
Problem: Crash when passing null object to ":echomsg".
Solution: Check for NULL pointer. (Yasuhiro Matsumoto, closes https://github.com/vim/vim/issues/5460)
| author | Bram Moolenaar <Bram@vim.org> |
|---|---|
| date | Wed, 08 Jan 2020 19:00:04 +0100 |
| parents | 7e7ec935e7c8 |
| children | 4c5eec1ef612 |
| rev | line source |
|---|---|
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1 /* vi:set ts=8 sts=4 sw=4 noet: */ |
| 7 | 2 /* |
| 3 * The following software is (C) 1984 Peter da Silva, the Mad Australian, in | |
| 4 * the public domain. It may be re-distributed for any purpose with the | |
| 5 * inclusion of this notice. | |
| 6 */ | |
| 7 | |
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8 // Modified by Bram Moolenaar for use with VIM - Vi Improved. |
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9 // A few bugs removed by Olaf 'Rhialto' Seibert. |
| 7 | 10 |
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11 // TERMLIB: Terminal independent database. |
| 7 | 12 |
| 13 #include "vim.h" | |
| 14 #include "termlib.pro" | |
| 15 | |
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16 #if !defined(AMIGA) && !defined(VMS) |
| 7 | 17 # include <sgtty.h> |
| 18 #endif | |
| 19 | |
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20 static int getent(char *, char *, FILE *, int); |
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21 static int nextent(char *, FILE *, int); |
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22 static int _match(char *, char *); |
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23 static char *_addfmt(char *, char *, int); |
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24 static char *_find(char *, char *); |
| 7 | 25 |
| 26 /* | |
| 27 * Global variables for termlib | |
| 28 */ | |
| 29 | |
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30 char *tent; // Pointer to terminal entry, set by tgetent |
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31 char PC = 0; // Pad character, default NULL |
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32 char *UP = 0, *BC = 0; // Pointers to UP and BC strings from database |
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33 short ospeed; // Baud rate (1-16, 1=300, 16=19200), as in stty |
| 7 | 34 |
| 35 /* | |
| 36 * Module: tgetent | |
| 37 * | |
| 38 * Purpose: Get termcap entry for <term> into buffer at <tbuf>. | |
| 39 * | |
| 40 * Calling conventions: char tbuf[TBUFSZ+], term=canonical name for terminal. | |
| 41 * | |
| 42 * Returned values: 1 = success, -1 = can't open file, | |
| 43 * 0 = can't find terminal. | |
| 44 * | |
| 45 * Notes: | |
| 46 * - Should probably supply static buffer. | |
| 47 * - Uses environment variables "TERM" and "TERMCAP". If TERM = term (that is, | |
| 48 * if the argument matches the environment) then it looks at TERMCAP. | |
| 49 * - If TERMCAP begins with a slash, then it assumes this is the file to | |
| 50 * search rather than /etc/termcap. | |
| 51 * - If TERMCAP does not begin with a slash, and it matches TERM, then this is | |
| 52 * used as the entry. | |
| 53 * - This could be simplified considerably for non-UNIX systems. | |
| 54 */ | |
| 55 | |
| 56 #ifndef TERMCAPFILE | |
| 57 # ifdef AMIGA | |
| 58 # define TERMCAPFILE "s:termcap" | |
| 59 # else | |
| 60 # ifdef VMS | |
| 61 # define TERMCAPFILE "VIMRUNTIME:termcap" | |
| 62 # else | |
| 63 # define TERMCAPFILE "/etc/termcap" | |
| 64 # endif | |
| 65 # endif | |
| 66 #endif | |
| 67 | |
| 68 int | |
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69 tgetent( |
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70 char *tbuf, // Buffer to hold termcap entry, TBUFSZ bytes max |
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71 char *term) // Name of terminal |
| 7 | 72 { |
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73 char tcbuf[32]; // Temp buffer to handle |
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74 char *tcptr = tcbuf; // extended entries |
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75 char *tcap = TERMCAPFILE; // Default termcap file |
| 7 | 76 char *tmp; |
| 77 FILE *termcap; | |
| 78 int retval = 0; | |
| 79 int len; | |
| 80 | |
| 81 if ((tmp = (char *)mch_getenv((char_u *)"TERMCAP")) != NULL) | |
| 82 { | |
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83 if (*tmp == '/') // TERMCAP = name of termcap file |
| 7 | 84 { |
| 85 tcap = tmp ; | |
| 86 #if defined(AMIGA) | |
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87 // Convert /usr/share/lib/termcap to usr:share/lib/termcap |
| 7 | 88 tcap++; |
| 89 tmp = strchr(tcap, '/'); | |
| 90 if (tmp) | |
| 91 *tmp = ':'; | |
| 92 #endif | |
| 93 } | |
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94 else // TERMCAP = termcap entry itself |
| 7 | 95 { |
| 96 int tlen = strlen(term); | |
| 97 | |
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98 while (*tmp && *tmp != ':') // Check if TERM matches |
| 7 | 99 { |
| 100 char *nexttmp; | |
| 101 | |
| 102 while (*tmp == '|') | |
| 103 tmp++; | |
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104 nexttmp = _find(tmp, ":|"); // Rhialto |
| 7 | 105 if (tmp+tlen == nexttmp && _match(tmp, term) == tlen) |
| 106 { | |
| 107 strcpy(tbuf, tmp); | |
| 108 tent = tbuf; | |
| 109 return 1; | |
| 110 } | |
| 111 else | |
| 112 tmp = nexttmp; | |
| 113 } | |
| 114 } | |
| 115 } | |
| 116 if (!(termcap = mch_fopen(tcap, "r"))) | |
| 117 { | |
| 118 strcpy(tbuf, tcap); | |
| 119 return -1; | |
| 120 } | |
| 121 | |
| 122 len = 0; | |
| 123 while (getent(tbuf + len, term, termcap, TBUFSZ - len)) | |
| 124 { | |
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125 tcptr = tcbuf; // Rhialto |
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126 if ((term = tgetstr("tc", &tcptr))) // extended entry |
| 7 | 127 { |
| 128 rewind(termcap); | |
| 129 len = strlen(tbuf); | |
| 130 } | |
| 131 else | |
| 132 { | |
| 133 retval = 1; | |
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134 tent = tbuf; // reset it back to the beginning |
| 7 | 135 break; |
| 136 } | |
| 137 } | |
| 138 fclose(termcap); | |
| 139 return retval; | |
| 140 } | |
| 141 | |
| 142 static int | |
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143 getent(char *tbuf, char *term, FILE *termcap, int buflen) |
| 7 | 144 { |
| 145 char *tptr; | |
| 146 int tlen = strlen(term); | |
| 147 | |
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148 while (nextent(tbuf, termcap, buflen)) // For each possible entry |
| 7 | 149 { |
| 150 tptr = tbuf; | |
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151 while (*tptr && *tptr != ':') // : terminates name field |
| 7 | 152 { |
| 153 char *nexttptr; | |
| 154 | |
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155 while (*tptr == '|') // | separates names |
| 7 | 156 tptr++; |
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157 nexttptr = _find(tptr, ":|"); // Rhialto |
| 7 | 158 if (tptr + tlen == nexttptr && |
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159 _match(tptr, term) == tlen) // FOUND! |
| 7 | 160 { |
| 161 tent = tbuf; | |
| 162 return 1; | |
| 163 } | |
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164 else // Look for next name |
| 7 | 165 tptr = nexttptr; |
| 166 } | |
| 167 } | |
| 168 return 0; | |
| 169 } | |
| 170 | |
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171 /* |
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172 * Read 1 entry from TERMCAP file. |
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173 */ |
| 7 | 174 static int |
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175 nextent(char *tbuf, FILE *termcap, int buflen) |
| 7 | 176 { |
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177 char *lbuf = tbuf; // lbuf=line buffer |
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178 // read lines straight into buffer |
| 7 | 179 |
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180 while (lbuf < tbuf+buflen && // There's room and |
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181 fgets(lbuf, (int)(tbuf+buflen-lbuf), termcap)) // another line |
| 7 | 182 { |
| 183 int llen = strlen(lbuf); | |
| 184 | |
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185 if (*lbuf == '#') // eat comments |
| 7 | 186 continue; |
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187 if (lbuf[-1] == ':' && // and whitespace |
| 7 | 188 lbuf[0] == '\t' && |
| 189 lbuf[1] == ':') | |
| 190 { | |
| 1621 | 191 STRMOVE(lbuf, lbuf + 2); |
| 7 | 192 llen -= 2; |
| 193 } | |
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194 if (lbuf[llen-2] == '\\') // and continuations |
| 7 | 195 lbuf += llen-2; |
| 196 else | |
| 197 { | |
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198 lbuf[llen-1]=0; // no continuation, return |
| 7 | 199 return 1; |
| 200 } | |
| 201 } | |
| 202 | |
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203 return 0; // ran into end of file |
| 7 | 204 } |
| 205 | |
| 206 /* | |
| 207 * Module: tgetflag | |
| 208 * | |
| 209 * Purpose: returns flag true or false as to the existence of a given entry. | |
| 210 * used with 'bs', 'am', etc... | |
| 211 * | |
| 212 * Calling conventions: id is the 2 character capability id. | |
| 213 * | |
| 214 * Returned values: 1 for success, 0 for failure. | |
| 215 */ | |
| 216 | |
| 217 int | |
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218 tgetflag(char *id) |
| 7 | 219 { |
| 220 char buf[256], *ptr = buf; | |
| 221 | |
| 222 return tgetstr(id, &ptr) ? 1 : 0; | |
| 223 } | |
| 224 | |
| 225 /* | |
| 226 * Module: tgetnum | |
| 227 * | |
| 228 * Purpose: get numeric value such as 'li' or 'co' from termcap. | |
| 229 * | |
| 230 * Calling conventions: id = 2 character id. | |
| 231 * | |
| 232 * Returned values: -1 for failure, else numerical value. | |
| 233 */ | |
| 234 | |
| 235 int | |
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236 tgetnum(char *id) |
| 7 | 237 { |
| 238 char *ptr, buf[256]; | |
| 239 ptr = buf; | |
| 240 | |
| 241 if (tgetstr(id, &ptr)) | |
| 242 return atoi(buf); | |
| 243 else | |
| 244 return 0; | |
| 245 } | |
| 246 | |
| 247 /* | |
| 248 * Module: tgetstr | |
| 249 * | |
| 250 * Purpose: get terminal capability string from database. | |
| 251 * | |
| 252 * Calling conventions: id is the two character capability id. | |
| 253 * (*buf) points into a hold buffer for the | |
| 254 * id. the capability is copied into the buffer | |
| 255 * and (*buf) is advanced to point to the next | |
| 256 * free byte in the buffer. | |
| 257 * | |
| 258 * Returned values: 0 = no such entry, otherwise returns original | |
| 259 * (*buf) (now a pointer to the string). | |
| 260 * | |
| 261 * Notes | |
| 262 * It also decodes certain escape sequences in the buffer. | |
| 263 * they should be obvious from the code: | |
| 264 * \E = escape. | |
| 265 * \n, \r, \t, \f, \b match the 'c' escapes. | |
| 266 * ^x matches control-x (^@...^_). | |
| 267 * \nnn matches nnn octal. | |
| 268 * \x, where x is anything else, matches x. I differ | |
| 269 * from the standard library here, in that I allow ^: to match | |
| 270 * :. | |
| 271 * | |
| 272 */ | |
| 273 | |
| 274 char * | |
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275 tgetstr(char *id, char **buf) |
| 7 | 276 { |
| 277 int len = strlen(id); | |
| 278 char *tmp=tent; | |
| 279 char *hold; | |
| 280 int i; | |
| 281 | |
| 282 do { | |
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283 tmp = _find(tmp, ":"); // For each field |
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284 while (*tmp == ':') // skip empty fields |
| 7 | 285 tmp++; |
| 286 if (!*tmp) | |
| 287 break; | |
| 288 | |
| 289 if (_match(id, tmp) == len) { | |
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290 tmp += len; // find '=' '@' or '#' |
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291 if (*tmp == '@') // :xx@: entry for tc |
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292 return 0; // deleted entry |
| 7 | 293 hold= *buf; |
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294 while (*++tmp && *tmp != ':') { // not at end of field |
| 7 | 295 switch(*tmp) { |
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296 case '\\': // Expand escapes here |
| 7 | 297 switch(*++tmp) { |
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298 case 0: // ignore backslashes |
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299 tmp--; // at end of entry |
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300 break; // shouldn't happen |
| 7 | 301 case 'e': |
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302 case 'E': // ESC |
| 7 | 303 *(*buf)++ = ESC; |
| 304 break; | |
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305 case 'n': // \n |
| 7 | 306 *(*buf)++ = '\n'; |
| 307 break; | |
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308 case 'r': // \r |
| 7 | 309 *(*buf)++ = '\r'; |
| 310 break; | |
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311 case 't': // \t |
| 7 | 312 *(*buf)++ = '\t'; |
| 313 break; | |
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314 case 'b': // \b |
| 7 | 315 *(*buf)++ = '\b'; |
| 316 break; | |
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317 case 'f': // \f |
| 7 | 318 *(*buf)++ = '\f'; |
| 319 break; | |
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320 case '0': // \nnn |
| 7 | 321 case '1': |
| 322 case '2': | |
| 323 case '3': | |
| 324 case '4': | |
| 325 case '5': | |
| 326 case '6': | |
| 327 case '7': | |
| 328 case '8': | |
| 329 case '9': | |
| 330 **buf = 0; | |
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331 // get up to three digits |
| 7 | 332 for (i = 0; i < 3 && VIM_ISDIGIT(*tmp); ++i) |
| 333 **buf = **buf * 8 + *tmp++ - '0'; | |
| 334 (*buf)++; | |
| 335 tmp--; | |
| 336 break; | |
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337 default: // \x, for all other x |
| 7 | 338 *(*buf)++= *tmp; |
| 339 } | |
| 340 break; | |
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341 case '^': // control characters |
| 7 | 342 ++tmp; |
| 343 *(*buf)++ = Ctrl_chr(*tmp); | |
| 344 break; | |
| 345 default: | |
| 346 *(*buf)++ = *tmp; | |
| 347 } | |
| 348 } | |
| 349 *(*buf)++ = 0; | |
| 350 return hold; | |
| 351 } | |
| 352 } while (*tmp); | |
| 353 | |
| 354 return 0; | |
| 355 } | |
| 356 | |
| 357 /* | |
| 358 * Module: tgoto | |
| 359 * | |
| 360 * Purpose: decode cm cursor motion string. | |
| 361 * | |
| 362 * Calling conventions: cm is cursor motion string. line, col, are the | |
| 363 * desired destination. | |
| 364 * | |
| 365 * Returned values: a string pointing to the decoded string, or "OOPS" if it | |
| 366 * cannot be decoded. | |
| 367 * | |
| 368 * Notes | |
| 369 * The accepted escapes are: | |
| 370 * %d as in printf, 0 origin. | |
| 371 * %2, %3 like %02d, %03d in printf. | |
| 372 * %. like %c | |
| 373 * %+x adds <x> to value, then %. | |
| 374 * %>xy if value>x, adds y. No output. | |
| 375 * %i increments line& col, no output. | |
| 376 * %r reverses order of line&col. No output. | |
| 377 * %% prints as a single %. | |
| 378 * %n exclusive or row & col with 0140. | |
| 379 * %B BCD, no output. | |
| 380 * %D reverse coding (x-2*(x%16)), no output. | |
| 381 */ | |
| 382 | |
| 383 char * | |
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384 tgoto( |
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385 char *cm, // cm string, from termcap |
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386 int col, // column, x position |
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387 int line) // line, y position |
| 7 | 388 { |
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389 char gx, gy, // x, y |
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390 *ptr, // pointer in 'cm' |
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391 reverse = 0, // reverse flag |
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392 *bufp, // pointer in returned string |
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393 addup = 0, // add upline |
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394 addbak = 0, // add backup |
| 7 | 395 c; |
| 396 static char buffer[32]; | |
| 397 | |
| 398 if (!cm) | |
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399 return "OOPS"; // Kludge, but standard |
| 7 | 400 |
| 401 bufp = buffer; | |
| 402 ptr = cm; | |
| 403 | |
| 404 while (*ptr) { | |
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405 if ((c = *ptr++) != '%') { // normal char |
| 7 | 406 *bufp++ = c; |
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407 } else { // % escape |
| 7 | 408 switch(c = *ptr++) { |
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409 case 'd': // decimal |
| 7 | 410 bufp = _addfmt(bufp, "%d", line); |
| 411 line = col; | |
| 412 break; | |
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413 case '2': // 2 digit decimal |
| 7 | 414 bufp = _addfmt(bufp, "%02d", line); |
| 415 line = col; | |
| 416 break; | |
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417 case '3': // 3 digit decimal |
| 7 | 418 bufp = _addfmt(bufp, "%03d", line); |
| 419 line = col; | |
| 420 break; | |
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421 case '>': // %>xy: if >x, add y |
| 7 | 422 gx = *ptr++; |
| 423 gy = *ptr++; | |
| 424 if (col>gx) col += gy; | |
| 425 if (line>gx) line += gy; | |
| 426 break; | |
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427 case '+': // %+c: add c |
| 7 | 428 line += *ptr++; |
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429 case '.': // print x/y |
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430 if (line == '\t' || // these are |
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431 line == '\n' || // chars that |
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432 line == '\004' || // UNIX hates |
| 7 | 433 line == '\0') { |
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434 line++; // so go to next pos |
| 7 | 435 if (reverse == (line == col)) |
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436 addup=1; // and mark UP |
| 7 | 437 else |
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438 addbak=1; // or BC |
| 7 | 439 } |
| 440 *bufp++=line; | |
| 441 line = col; | |
| 442 break; | |
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443 case 'r': // r: reverse |
| 7 | 444 gx = line; |
| 445 line = col; | |
| 446 col = gx; | |
| 447 reverse = 1; | |
| 448 break; | |
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449 case 'i': // increment (1-origin screen) |
| 7 | 450 col++; |
| 451 line++; | |
| 452 break; | |
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453 case '%': // %%=% literally |
| 7 | 454 *bufp++='%'; |
| 455 break; | |
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456 case 'n': // magic DM2500 code |
| 7 | 457 line ^= 0140; |
| 458 col ^= 0140; | |
| 459 break; | |
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460 case 'B': // bcd encoding |
| 7 | 461 line = line/10<<4+line%10; |
| 462 col = col/10<<4+col%10; | |
| 463 break; | |
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464 case 'D': // magic Delta Data code |
| 7 | 465 line = line-2*(line&15); |
| 466 col = col-2*(col&15); | |
| 467 break; | |
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468 default: // Unknown escape |
| 7 | 469 return "OOPS"; |
| 470 } | |
| 471 } | |
| 472 } | |
| 473 | |
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474 if (addup) // add upline |
| 7 | 475 if (UP) { |
| 476 ptr=UP; | |
| 477 while (VIM_ISDIGIT(*ptr) || *ptr == '.') | |
| 478 ptr++; | |
| 479 if (*ptr == '*') | |
| 480 ptr++; | |
| 481 while (*ptr) | |
| 482 *bufp++ = *ptr++; | |
| 483 } | |
| 484 | |
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485 if (addbak) // add backspace |
| 7 | 486 if (BC) { |
| 487 ptr=BC; | |
| 488 while (VIM_ISDIGIT(*ptr) || *ptr == '.') | |
| 489 ptr++; | |
| 490 if (*ptr == '*') | |
| 491 ptr++; | |
| 492 while (*ptr) | |
| 493 *bufp++ = *ptr++; | |
| 494 } | |
| 495 else | |
| 496 *bufp++='\b'; | |
| 497 | |
| 498 *bufp = 0; | |
| 499 | |
| 500 return(buffer); | |
| 501 } | |
| 502 | |
| 503 /* | |
| 504 * Module: tputs | |
| 505 * | |
| 506 * Purpose: decode padding information | |
| 507 * | |
| 508 * Calling conventions: cp = string to be padded, affcnt = # of items affected | |
| 509 * (lines, characters, whatever), outc = routine to output 1 character. | |
| 510 * | |
| 511 * Returned values: none | |
| 512 * | |
| 513 * Notes | |
| 514 * cp has padding information ahead of it, in the form | |
| 515 * nnnTEXT or nnn*TEXT. nnn is the number of milliseconds to delay, | |
| 516 * and may be a decimal (nnn.mmm). If the asterisk is given, then | |
| 517 * the delay is multiplied by afcnt. The delay is produced by outputting | |
| 518 * a number of nulls (or other padding char) after printing the | |
| 519 * TEXT. | |
| 520 * | |
| 521 */ | |
| 522 | |
| 523 long _bauds[16]={ | |
| 524 0, 50, 75, 110, | |
| 525 134, 150, 200, 300, | |
| 526 600, 1200, 1800, 2400, | |
| 527 4800, 9600, 19200, 19200 }; | |
| 528 | |
| 529 int | |
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530 tputs( |
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531 char *cp, // string to print |
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532 int affcnt, // Number of lines affected |
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533 void (*outc)(unsigned int)) // routine to output 1 character |
| 7 | 534 { |
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535 long frac, // 10^(#digits after decimal point) |
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536 counter, // digits |
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537 atol(const char *); |
| 7 | 538 |
| 539 if (VIM_ISDIGIT(*cp)) { | |
| 540 counter = 0; | |
| 541 frac = 1000; | |
| 542 while (VIM_ISDIGIT(*cp)) | |
| 543 counter = counter * 10L + (long)(*cp++ - '0'); | |
| 544 if (*cp == '.') | |
| 545 while (VIM_ISDIGIT(*++cp)) { | |
| 546 counter = counter * 10L + (long)(*cp++ - '0'); | |
| 547 frac = frac * 10; | |
| 548 } | |
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549 if (*cp!='*') { // multiply by affected lines |
| 7 | 550 if (affcnt>1) affcnt = 1; |
| 551 } | |
| 552 else | |
| 553 cp++; | |
| 554 | |
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555 // Calculate number of characters for padding counter/frac ms delay |
| 7 | 556 if (ospeed) |
| 557 counter = (counter * _bauds[ospeed] * (long)affcnt) / frac; | |
| 558 | |
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559 while (*cp) // output string |
| 7 | 560 (*outc)(*cp++); |
| 561 if (ospeed) | |
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562 while (counter--) // followed by pad characters |
| 7 | 563 (*outc)(PC); |
| 564 } | |
| 565 else | |
| 566 while (*cp) | |
| 567 (*outc)(*cp++); | |
| 568 return 0; | |
| 569 } | |
| 570 | |
| 571 /* | |
| 572 * Module: tutil.c | |
| 573 * | |
| 574 * Purpose: Utility routines for TERMLIB functions. | |
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575 * Returns length of text common to s1 and s2. |
| 7 | 576 */ |
| 577 static int | |
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578 _match(char *s1, char *s2) |
| 7 | 579 { |
| 580 int i = 0; | |
| 581 | |
| 582 while (s1[i] && s1[i] == s2[i]) | |
| 583 i++; | |
| 584 | |
| 585 return i; | |
| 586 } | |
| 587 | |
| 588 /* | |
| 589 * finds next c in s that's a member of set, returns pointer | |
| 590 */ | |
| 591 static char * | |
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592 _find(char *s, char *set) |
| 7 | 593 { |
| 594 for(; *s; s++) | |
| 595 { | |
| 596 char *ptr = set; | |
| 597 | |
| 598 while (*ptr && *s != *ptr) | |
| 599 ptr++; | |
| 600 | |
| 601 if (*ptr) | |
| 602 return s; | |
| 603 } | |
| 604 | |
| 605 return s; | |
| 606 } | |
| 607 | |
| 608 /* | |
| 609 * add val to buf according to format fmt | |
| 610 */ | |
| 611 static char * | |
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612 _addfmt(char *buf, char *fmt, int val) |
| 7 | 613 { |
| 614 sprintf(buf, fmt, val); | |
| 615 while (*buf) | |
| 616 buf++; | |
| 617 return buf; | |
| 618 } |