| 1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | static char *sccsid = "@(#)ex_unix.c 6.1 %G%"; |
| 3 | #include "ex.h" |
| 4 | #include "ex_temp.h" |
| 5 | #include "ex_tty.h" |
| 6 | #include "ex_vis.h" |
| 7 | |
| 8 | /* |
| 9 | * Unix escapes, filtering |
| 10 | */ |
| 11 | |
| 12 | /* |
| 13 | * First part of a shell escape, |
| 14 | * parse the line, expanding # and % and ! and printing if implied. |
| 15 | */ |
| 16 | unix0(warn) |
| 17 | bool warn; |
| 18 | { |
| 19 | register char *up, *fp; |
| 20 | register short c; |
| 21 | char printub, puxb[UXBSIZE + sizeof (int)]; |
| 22 | |
| 23 | printub = 0; |
| 24 | CP(puxb, uxb); |
| 25 | c = getchar(); |
| 26 | if (c == '\n' || c == EOF) |
| 27 | error("Incomplete shell escape command@- use 'shell' to get a shell"); |
| 28 | up = uxb; |
| 29 | do { |
| 30 | switch (c) { |
| 31 | |
| 32 | case '\\': |
| 33 | if (any(peekchar(), "%#!")) |
| 34 | c = getchar(); |
| 35 | default: |
| 36 | if (up >= &uxb[UXBSIZE]) { |
| 37 | tunix: |
| 38 | uxb[0] = 0; |
| 39 | error("Command too long"); |
| 40 | } |
| 41 | *up++ = c; |
| 42 | break; |
| 43 | |
| 44 | case '!': |
| 45 | fp = puxb; |
| 46 | if (*fp == 0) { |
| 47 | uxb[0] = 0; |
| 48 | error("No previous command@to substitute for !"); |
| 49 | } |
| 50 | printub++; |
| 51 | while (*fp) { |
| 52 | if (up >= &uxb[UXBSIZE]) |
| 53 | goto tunix; |
| 54 | *up++ = *fp++; |
| 55 | } |
| 56 | break; |
| 57 | |
| 58 | case '#': |
| 59 | fp = altfile; |
| 60 | if (*fp == 0) { |
| 61 | uxb[0] = 0; |
| 62 | error("No alternate filename@to substitute for #"); |
| 63 | } |
| 64 | goto uexp; |
| 65 | |
| 66 | case '%': |
| 67 | fp = savedfile; |
| 68 | if (*fp == 0) { |
| 69 | uxb[0] = 0; |
| 70 | error("No filename@to substitute for %%"); |
| 71 | } |
| 72 | uexp: |
| 73 | printub++; |
| 74 | while (*fp) { |
| 75 | if (up >= &uxb[UXBSIZE]) |
| 76 | goto tunix; |
| 77 | *up++ = *fp++ | QUOTE; |
| 78 | } |
| 79 | break; |
| 80 | } |
| 81 | c = getchar(); |
| 82 | } while (c == '"' || c == '|' || !endcmd(c)); |
| 83 | if (c == EOF) |
| 84 | ungetchar(c); |
| 85 | *up = 0; |
| 86 | if (!inopen) |
| 87 | resetflav(); |
| 88 | if (warn) |
| 89 | ckaw(); |
| 90 | if (warn && hush == 0 && chng && xchng != chng && value(WARN) && dol > zero) { |
| 91 | xchng = chng; |
| 92 | vnfl(); |
| 93 | printf(mesg("[No write]|[No write since last change]")); |
| 94 | noonl(); |
| 95 | flush(); |
| 96 | } else |
| 97 | warn = 0; |
| 98 | if (printub) { |
| 99 | if (uxb[0] == 0) |
| 100 | error("No previous command@to repeat"); |
| 101 | if (inopen) { |
| 102 | splitw++; |
| 103 | vclean(); |
| 104 | vgoto(WECHO, 0); |
| 105 | } |
| 106 | if (warn) |
| 107 | vnfl(); |
| 108 | if (hush == 0) |
| 109 | lprintf("!%s", uxb); |
| 110 | if (inopen && Outchar != termchar) { |
| 111 | vclreol(); |
| 112 | vgoto(WECHO, 0); |
| 113 | } else |
| 114 | putnl(); |
| 115 | flush(); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * Do the real work for execution of a shell escape. |
| 121 | * Mode is like the number passed to open system calls |
| 122 | * and indicates filtering. If input is implied, newstdin |
| 123 | * must have been setup already. |
| 124 | */ |
| 125 | ttymode |
| 126 | unixex(opt, up, newstdin, mode) |
| 127 | char *opt, *up; |
| 128 | int newstdin, mode; |
| 129 | { |
| 130 | int pvec[2]; |
| 131 | ttymode f; |
| 132 | |
| 133 | signal(SIGINT, SIG_IGN); |
| 134 | #ifdef SIGTSTP |
| 135 | if (dosusp) |
| 136 | signal(SIGTSTP, SIG_DFL); |
| 137 | #endif |
| 138 | if (inopen) |
| 139 | f = setty(normf); |
| 140 | if ((mode & 1) && pipe(pvec) < 0) { |
| 141 | /* Newstdin should be io so it will be closed */ |
| 142 | if (inopen) |
| 143 | setty(f); |
| 144 | error("Can't make pipe for filter"); |
| 145 | } |
| 146 | #ifndef VFORK |
| 147 | pid = fork(); |
| 148 | #else |
| 149 | pid = vfork(); |
| 150 | #endif |
| 151 | if (pid < 0) { |
| 152 | if (mode & 1) { |
| 153 | close(pvec[0]); |
| 154 | close(pvec[1]); |
| 155 | } |
| 156 | setrupt(); |
| 157 | error("No more processes"); |
| 158 | } |
| 159 | if (pid == 0) { |
| 160 | if (mode & 2) { |
| 161 | close(0); |
| 162 | dup(newstdin); |
| 163 | close(newstdin); |
| 164 | } |
| 165 | if (mode & 1) { |
| 166 | close(pvec[0]); |
| 167 | close(1); |
| 168 | dup(pvec[1]); |
| 169 | if (inopen) { |
| 170 | close(2); |
| 171 | dup(1); |
| 172 | } |
| 173 | close(pvec[1]); |
| 174 | } |
| 175 | if (io) |
| 176 | close(io); |
| 177 | if (tfile) |
| 178 | close(tfile); |
| 179 | #ifndef VMUNIX |
| 180 | close(erfile); |
| 181 | #endif |
| 182 | signal(SIGHUP, oldhup); |
| 183 | signal(SIGQUIT, oldquit); |
| 184 | if (ruptible) |
| 185 | signal(SIGINT, SIG_DFL); |
| 186 | execl(svalue(SHELL), "sh", opt, up, (char *) 0); |
| 187 | printf("No %s!\n", svalue(SHELL)); |
| 188 | error(NOSTR); |
| 189 | } |
| 190 | if (mode & 1) { |
| 191 | io = pvec[0]; |
| 192 | close(pvec[1]); |
| 193 | } |
| 194 | if (newstdin) |
| 195 | close(newstdin); |
| 196 | return (f); |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * Wait for the command to complete. |
| 201 | * F is for restoration of tty mode if from open/visual. |
| 202 | * C flags suppression of printing. |
| 203 | */ |
| 204 | unixwt(c, f) |
| 205 | bool c; |
| 206 | ttymode f; |
| 207 | { |
| 208 | |
| 209 | waitfor(); |
| 210 | #ifdef SIGTSTP |
| 211 | if (dosusp) |
| 212 | signal(SIGTSTP, onsusp); |
| 213 | #endif |
| 214 | if (inopen) |
| 215 | setty(f); |
| 216 | setrupt(); |
| 217 | if (!inopen && c && hush == 0) { |
| 218 | printf("!\n"); |
| 219 | flush(); |
| 220 | termreset(); |
| 221 | gettmode(); |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * Setup a pipeline for the filtration implied by mode |
| 227 | * which is like a open number. If input is required to |
| 228 | * the filter, then a child editor is created to write it. |
| 229 | * If output is catch it from io which is created by unixex. |
| 230 | */ |
| 231 | filter(mode) |
| 232 | register int mode; |
| 233 | { |
| 234 | static int pvec[2]; |
| 235 | register ttymode f; |
| 236 | register int lines = lineDOL(); |
| 237 | |
| 238 | mode++; |
| 239 | if (mode & 2) { |
| 240 | signal(SIGINT, SIG_IGN); |
| 241 | if (pipe(pvec) < 0) |
| 242 | error("Can't make pipe"); |
| 243 | pid = fork(); |
| 244 | io = pvec[0]; |
| 245 | if (pid < 0) { |
| 246 | setrupt(); |
| 247 | close(pvec[1]); |
| 248 | error("No more processes"); |
| 249 | } |
| 250 | if (pid == 0) { |
| 251 | setrupt(); |
| 252 | io = pvec[1]; |
| 253 | close(pvec[0]); |
| 254 | putfile(); |
| 255 | exit(0); |
| 256 | } |
| 257 | close(pvec[1]); |
| 258 | io = pvec[0]; |
| 259 | setrupt(); |
| 260 | } |
| 261 | f = unixex("-c", uxb, (mode & 2) ? pvec[0] : 0, mode); |
| 262 | if (mode == 3) { |
| 263 | delete(0); |
| 264 | addr2 = addr1 - 1; |
| 265 | } |
| 266 | if (mode & 1) { |
| 267 | if(FIXUNDO) |
| 268 | undap1 = undap2 = addr2+1; |
| 269 | ignore(append(getfile, addr2)); |
| 270 | #ifdef TRACE |
| 271 | if (trace) |
| 272 | vudump("after append in filter"); |
| 273 | #endif |
| 274 | } |
| 275 | close(io); |
| 276 | io = -1; |
| 277 | unixwt(!inopen, f); |
| 278 | netchHAD(lines); |
| 279 | } |
| 280 | |
| 281 | /* |
| 282 | * Set up to do a recover, getting io to be a pipe from |
| 283 | * the recover process. |
| 284 | */ |
| 285 | recover() |
| 286 | { |
| 287 | static int pvec[2]; |
| 288 | |
| 289 | if (pipe(pvec) < 0) |
| 290 | error(" Can't make pipe for recovery"); |
| 291 | pid = fork(); |
| 292 | io = pvec[0]; |
| 293 | if (pid < 0) { |
| 294 | close(pvec[1]); |
| 295 | error(" Can't fork to execute recovery"); |
| 296 | } |
| 297 | if (pid == 0) { |
| 298 | close(2); |
| 299 | dup(1); |
| 300 | close(1); |
| 301 | dup(pvec[1]); |
| 302 | close(pvec[1]); |
| 303 | execl(EXRECOVER, "exrecover", svalue(DIRECTORY), file, (char *) 0); |
| 304 | close(1); |
| 305 | dup(2); |
| 306 | error(" No recovery routine"); |
| 307 | } |
| 308 | close(pvec[1]); |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * Wait for the process (pid an external) to complete. |
| 313 | */ |
| 314 | waitfor() |
| 315 | { |
| 316 | |
| 317 | do |
| 318 | rpid = wait(&status); |
| 319 | while (rpid != pid && rpid != -1); |
| 320 | status = (status >> 8) & 0377; |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * The end of a recover operation. If the process |
| 325 | * exits non-zero, force not edited; otherwise force |
| 326 | * a write. |
| 327 | */ |
| 328 | revocer() |
| 329 | { |
| 330 | |
| 331 | waitfor(); |
| 332 | if (pid == rpid && status != 0) |
| 333 | edited = 0; |
| 334 | else |
| 335 | change(); |
| 336 | } |