| 1 | /* |
| 2 | * Copyright (c) 1980 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. |
| 5 | */ |
| 6 | |
| 7 | #ifndef lint |
| 8 | static char *sccsid = "@(#)ex_unix.c 7.8 (Berkeley) 7/28/88"; |
| 9 | #endif not lint |
| 10 | |
| 11 | #include "ex.h" |
| 12 | #include "ex_temp.h" |
| 13 | #include "ex_tty.h" |
| 14 | #include "ex_vis.h" |
| 15 | #include <sys/wait.h> |
| 16 | |
| 17 | /* |
| 18 | * Unix escapes, filtering |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * First part of a shell escape, |
| 23 | * parse the line, expanding # and % and ! and printing if implied. |
| 24 | */ |
| 25 | unix0(warn) |
| 26 | bool warn; |
| 27 | { |
| 28 | register char *up, *fp; |
| 29 | register short c; |
| 30 | char printub, puxb[UXBSIZE + sizeof (int)]; |
| 31 | |
| 32 | printub = 0; |
| 33 | CP(puxb, uxb); |
| 34 | c = ex_getchar(); |
| 35 | if (c == '\n' || c == EOF) |
| 36 | error("Incomplete shell escape command@- use 'shell' to get a shell"); |
| 37 | up = uxb; |
| 38 | do { |
| 39 | switch (c) { |
| 40 | |
| 41 | case '\\': |
| 42 | if (any(peekchar(), "%#!")) |
| 43 | c = ex_getchar(); |
| 44 | default: |
| 45 | if (up >= &uxb[UXBSIZE]) { |
| 46 | tunix: |
| 47 | uxb[0] = 0; |
| 48 | error("Command too long"); |
| 49 | } |
| 50 | *up++ = c; |
| 51 | break; |
| 52 | |
| 53 | case '!': |
| 54 | fp = puxb; |
| 55 | if (*fp == 0) { |
| 56 | uxb[0] = 0; |
| 57 | error("No previous command@to substitute for !"); |
| 58 | } |
| 59 | printub++; |
| 60 | while (*fp) { |
| 61 | if (up >= &uxb[UXBSIZE]) |
| 62 | goto tunix; |
| 63 | *up++ = *fp++; |
| 64 | } |
| 65 | break; |
| 66 | |
| 67 | case '#': |
| 68 | fp = altfile; |
| 69 | if (*fp == 0) { |
| 70 | uxb[0] = 0; |
| 71 | error("No alternate filename@to substitute for #"); |
| 72 | } |
| 73 | goto uexp; |
| 74 | |
| 75 | case '%': |
| 76 | fp = savedfile; |
| 77 | if (*fp == 0) { |
| 78 | uxb[0] = 0; |
| 79 | error("No filename@to substitute for %%"); |
| 80 | } |
| 81 | uexp: |
| 82 | printub++; |
| 83 | while (*fp) { |
| 84 | if (up >= &uxb[UXBSIZE]) |
| 85 | goto tunix; |
| 86 | *up++ = *fp++ | QUOTE; |
| 87 | } |
| 88 | break; |
| 89 | } |
| 90 | c = ex_getchar(); |
| 91 | } while (c == '"' || c == '|' || !endcmd(c)); |
| 92 | if (c == EOF) |
| 93 | ungetchar(c); |
| 94 | *up = 0; |
| 95 | if (!inopen) |
| 96 | resetflav(); |
| 97 | if (warn) |
| 98 | ckaw(); |
| 99 | if (warn && hush == 0 && chng && xchng != chng && value(WARN) && dol > zero) { |
| 100 | xchng = chng; |
| 101 | vnfl(); |
| 102 | ex_printf(mesg("[No write]|[No write since last change]")); |
| 103 | noonl(); |
| 104 | flush(); |
| 105 | } else |
| 106 | warn = 0; |
| 107 | if (printub) { |
| 108 | if (uxb[0] == 0) |
| 109 | error("No previous command@to repeat"); |
| 110 | if (inopen) { |
| 111 | splitw++; |
| 112 | vclean(); |
| 113 | vgoto(WECHO, 0); |
| 114 | } |
| 115 | if (warn) |
| 116 | vnfl(); |
| 117 | if (hush == 0) |
| 118 | lprintf("!%s", uxb); |
| 119 | if (inopen && Outchar != termchar) { |
| 120 | vclreol(); |
| 121 | vgoto(WECHO, 0); |
| 122 | } else |
| 123 | putnl(); |
| 124 | flush(); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | /* |
| 129 | * Do the real work for execution of a shell escape. |
| 130 | * Mode is like the number passed to open system calls |
| 131 | * and indicates filtering. If input is implied, newstdin |
| 132 | * must have been setup already. |
| 133 | */ |
| 134 | ttymode |
| 135 | unixex(opt, up, newstdin, mode) |
| 136 | char *opt, *up; |
| 137 | int newstdin, mode; |
| 138 | { |
| 139 | int pvec[2]; |
| 140 | ttymode f; |
| 141 | |
| 142 | signal(SIGINT, SIG_IGN); |
| 143 | #ifdef SIGTSTP |
| 144 | if (dosusp) |
| 145 | signal(SIGTSTP, SIG_DFL); |
| 146 | #endif |
| 147 | if (inopen) |
| 148 | f = setty(normf); |
| 149 | if ((mode & 1) && pipe(pvec) < 0) { |
| 150 | /* Newstdin should be io so it will be closed */ |
| 151 | if (inopen) |
| 152 | ignore(setty(f)); |
| 153 | error("Can't make pipe for filter"); |
| 154 | } |
| 155 | #ifndef VFORK |
| 156 | pid = fork(); |
| 157 | #else |
| 158 | pid = vfork(); |
| 159 | #endif |
| 160 | if (pid < 0) { |
| 161 | if (mode & 1) { |
| 162 | close(pvec[0]); |
| 163 | close(pvec[1]); |
| 164 | } |
| 165 | setrupt(); |
| 166 | error("No more processes"); |
| 167 | } |
| 168 | if (pid == 0) { |
| 169 | if (up) { |
| 170 | register char *cp = up; |
| 171 | while (*cp) |
| 172 | *cp++ &= TRIM; |
| 173 | } |
| 174 | if (mode & 2) { |
| 175 | close(0); |
| 176 | dup(newstdin); |
| 177 | close(newstdin); |
| 178 | } |
| 179 | if (mode & 1) { |
| 180 | close(pvec[0]); |
| 181 | close(1); |
| 182 | dup(pvec[1]); |
| 183 | if (inopen) { |
| 184 | close(2); |
| 185 | dup(1); |
| 186 | } |
| 187 | close(pvec[1]); |
| 188 | } |
| 189 | if (io) |
| 190 | close(io); |
| 191 | if (tfile) |
| 192 | close(tfile); |
| 193 | #ifdef EXSTRINGS |
| 194 | close(erfile); |
| 195 | #endif |
| 196 | signal(SIGHUP, oldhup); |
| 197 | signal(SIGQUIT, oldquit); |
| 198 | if (ruptible) |
| 199 | signal(SIGINT, SIG_DFL); |
| 200 | execl(svalue(SHELL), "sh", opt, up, (char *) 0); |
| 201 | ex_printf("No %s!\n", svalue(SHELL)); |
| 202 | error(NOSTR); |
| 203 | } |
| 204 | if (mode & 1) { |
| 205 | io = pvec[0]; |
| 206 | close(pvec[1]); |
| 207 | } |
| 208 | if (newstdin) |
| 209 | close(newstdin); |
| 210 | return (f); |
| 211 | } |
| 212 | |
| 213 | /* |
| 214 | * Wait for the command to complete. |
| 215 | * F is for restoration of tty mode if from open/visual. |
| 216 | * C flags suppression of printing. |
| 217 | */ |
| 218 | unixwt(c, f) |
| 219 | bool c; |
| 220 | ttymode f; |
| 221 | { |
| 222 | |
| 223 | waitfor(); |
| 224 | #ifdef SIGTSTP |
| 225 | if (dosusp) |
| 226 | signal(SIGTSTP, onsusp); |
| 227 | #endif |
| 228 | if (inopen) |
| 229 | ignore(setty(f)); |
| 230 | setrupt(); |
| 231 | if (!inopen && c && hush == 0) { |
| 232 | ex_printf("!\n"); |
| 233 | flush(); |
| 234 | termreset(); |
| 235 | gettmode(); |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * Setup a pipeline for the filtration implied by mode |
| 241 | * which is like a open number. If input is required to |
| 242 | * the filter, then a child editor is created to write it. |
| 243 | * If output is catch it from io which is created by unixex. |
| 244 | */ |
| 245 | filter(mode) |
| 246 | register int mode; |
| 247 | { |
| 248 | static int pvec[2]; |
| 249 | ttymode f; /* mjm: was register */ |
| 250 | register int lines = lineDOL(); |
| 251 | struct stat statb; |
| 252 | |
| 253 | mode++; |
| 254 | if (mode & 2) { |
| 255 | signal(SIGINT, SIG_IGN); |
| 256 | if (pipe(pvec) < 0) |
| 257 | error("Can't make pipe"); |
| 258 | pid = fork(); |
| 259 | io = pvec[0]; |
| 260 | if (pid < 0) { |
| 261 | setrupt(); |
| 262 | close(pvec[1]); |
| 263 | error("No more processes"); |
| 264 | } |
| 265 | if (pid == 0) { |
| 266 | setrupt(); |
| 267 | io = pvec[1]; |
| 268 | close(pvec[0]); |
| 269 | putfile(1); |
| 270 | ex_exit(0); |
| 271 | } |
| 272 | close(pvec[1]); |
| 273 | io = pvec[0]; |
| 274 | setrupt(); |
| 275 | } |
| 276 | f = unixex("-c", uxb, (mode & 2) ? pvec[0] : 0, mode); |
| 277 | if (mode == 3) { |
| 278 | ex_delete(0); |
| 279 | addr2 = addr1 - 1; |
| 280 | } |
| 281 | if (mode & 1) { |
| 282 | if(FIXUNDO) |
| 283 | undap1 = undap2 = addr2+1; |
| 284 | if (fstat(io, &statb) < 0) |
| 285 | bsize = LBSIZE; |
| 286 | else { |
| 287 | bsize = statb.st_blksize; |
| 288 | if (bsize <= 0) |
| 289 | bsize = LBSIZE; |
| 290 | } |
| 291 | ignore(append(getfile, addr2)); |
| 292 | #ifdef TRACE |
| 293 | if (trace) |
| 294 | vudump("after append in filter"); |
| 295 | #endif |
| 296 | } |
| 297 | close(io); |
| 298 | io = -1; |
| 299 | unixwt(!inopen, f); |
| 300 | netchHAD(lines); |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * Set up to do a recover, getting io to be a pipe from |
| 305 | * the recover process. |
| 306 | */ |
| 307 | recover() |
| 308 | { |
| 309 | static int pvec[2]; |
| 310 | |
| 311 | if (pipe(pvec) < 0) |
| 312 | error(" Can't make pipe for recovery"); |
| 313 | pid = fork(); |
| 314 | io = pvec[0]; |
| 315 | if (pid < 0) { |
| 316 | close(pvec[1]); |
| 317 | error(" Can't fork to execute recovery"); |
| 318 | } |
| 319 | if (pid == 0) { |
| 320 | close(2); |
| 321 | dup(1); |
| 322 | close(1); |
| 323 | dup(pvec[1]); |
| 324 | close(pvec[1]); |
| 325 | execl(_PATH_EXRECOVER, "exrecover", svalue(DIRECTORY), |
| 326 | file, (char *) 0); |
| 327 | close(1); |
| 328 | dup(2); |
| 329 | error(" No recovery routine"); |
| 330 | } |
| 331 | close(pvec[1]); |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * Wait for the process (pid an external) to complete. |
| 336 | */ |
| 337 | waitfor() |
| 338 | { |
| 339 | union wait stat, pstat; |
| 340 | int wpid; |
| 341 | extern char *sys_siglist[]; |
| 342 | |
| 343 | pstat.w_status = 0; |
| 344 | do { |
| 345 | wpid = wait((int *)&stat); |
| 346 | if (wpid == pid) { |
| 347 | pstat = stat; |
| 348 | rpid = wpid; |
| 349 | } |
| 350 | } while (wpid != -1); |
| 351 | |
| 352 | if (WIFEXITED(pstat)) |
| 353 | status = pstat.w_retcode; |
| 354 | else { |
| 355 | ex_printf("%d: terminated abnormally: %s ", |
| 356 | pid, sys_siglist[pstat.w_termsig]); |
| 357 | if (pstat.w_coredump) |
| 358 | ex_printf("(core dumped) "); |
| 359 | if (!inopen) |
| 360 | ex_printf("\r\n"); |
| 361 | status = pstat.w_termsig; |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | /* |
| 366 | * The end of a recover operation. If the process |
| 367 | * exits non-zero, force not edited; otherwise force |
| 368 | * a write. |
| 369 | */ |
| 370 | revocer() |
| 371 | { |
| 372 | |
| 373 | waitfor(); |
| 374 | if (pid == rpid && status != 0) |
| 375 | edited = 0; |
| 376 | else |
| 377 | change(); |
| 378 | } |