| 1 | /*- |
| 2 | * Copyright (c) 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed to Berkeley by |
| 6 | * Kenneth Almquist. |
| 7 | * |
| 8 | * %sccs.include.redist.c% |
| 9 | */ |
| 10 | |
| 11 | #ifndef lint |
| 12 | static char sccsid[] = "@(#)histedit.c 8.1 (Berkeley) %G%"; |
| 13 | #endif /* not lint */ |
| 14 | |
| 15 | /* |
| 16 | * Editline and history functions (and glue). |
| 17 | */ |
| 18 | #include <sys/param.h> |
| 19 | #include <paths.h> |
| 20 | #include <stdio.h> |
| 21 | #include "shell.h" |
| 22 | #include "parser.h" |
| 23 | #include "var.h" |
| 24 | #include "options.h" |
| 25 | #include "mystring.h" |
| 26 | #include "error.h" |
| 27 | #include "histedit.h" |
| 28 | #include "memalloc.h" |
| 29 | |
| 30 | #define MAXHISTLOOPS 4 /* max recursions through fc */ |
| 31 | #define DEFEDITOR "ed" /* default editor *should* be $EDITOR */ |
| 32 | |
| 33 | History *hist; /* history cookie */ |
| 34 | EditLine *el; /* editline cookie */ |
| 35 | int displayhist; |
| 36 | static FILE *el_in, *el_out; |
| 37 | |
| 38 | STATIC char *fc_replace __P((const char *, char *, char *)); |
| 39 | |
| 40 | /* |
| 41 | * Set history and editing status. Called whenever the status may |
| 42 | * have changed (figures out what to do). |
| 43 | */ |
| 44 | histedit() { |
| 45 | |
| 46 | #define editing (Eflag || Vflag) |
| 47 | |
| 48 | if (iflag) { |
| 49 | if (!hist) { |
| 50 | /* |
| 51 | * turn history on |
| 52 | */ |
| 53 | INTOFF; |
| 54 | hist = history_init(); |
| 55 | INTON; |
| 56 | |
| 57 | if (hist != NULL) |
| 58 | sethistsize(); |
| 59 | else |
| 60 | out2str("sh: can't initialize history\n"); |
| 61 | } |
| 62 | if (editing && !el && isatty(0)) { /* && isatty(2) ??? */ |
| 63 | /* |
| 64 | * turn editing on |
| 65 | */ |
| 66 | INTOFF; |
| 67 | if (el_in == NULL) |
| 68 | el_in = fdopen(0, "r"); |
| 69 | if (el_out == NULL) |
| 70 | el_out = fdopen(2, "w"); |
| 71 | if (el_in == NULL || el_out == NULL) |
| 72 | goto bad; |
| 73 | el = el_init(arg0, el_in, el_out); |
| 74 | if (el != NULL) { |
| 75 | if (hist) |
| 76 | el_set(el, EL_HIST, history, hist); |
| 77 | el_set(el, EL_PROMPT, getprompt); |
| 78 | } else { |
| 79 | bad: |
| 80 | out2str("sh: can't initialize editing\n"); |
| 81 | } |
| 82 | INTON; |
| 83 | } else if (!editing && el) { |
| 84 | INTOFF; |
| 85 | el_end(el); |
| 86 | el = NULL; |
| 87 | INTON; |
| 88 | } |
| 89 | if (el) { |
| 90 | if (Vflag) |
| 91 | el_set(el, EL_EDITOR, "vi"); |
| 92 | else if (Eflag) |
| 93 | el_set(el, EL_EDITOR, "emacs"); |
| 94 | } |
| 95 | } else { |
| 96 | INTOFF; |
| 97 | if (el) { /* no editing if not interactive */ |
| 98 | el_end(el); |
| 99 | el = NULL; |
| 100 | } |
| 101 | if (hist) { |
| 102 | history_end(hist); |
| 103 | hist = NULL; |
| 104 | } |
| 105 | INTON; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | sethistsize() { |
| 110 | char *cp; |
| 111 | int histsize; |
| 112 | |
| 113 | if (hist != NULL) { |
| 114 | cp = lookupvar("HISTSIZE"); |
| 115 | if (cp == NULL || *cp == '\0' || |
| 116 | (histsize = atoi(cp)) < 0) |
| 117 | histsize = 100; |
| 118 | history(hist, H_EVENT, histsize); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * This command is provided since POSIX decided to standardize |
| 124 | * the Korn shell fc command. Oh well... |
| 125 | */ |
| 126 | histcmd(argc, argv) |
| 127 | char *argv[]; |
| 128 | { |
| 129 | extern char *optarg; |
| 130 | extern int optind, optopt, optreset; |
| 131 | int ch; |
| 132 | char *editor = NULL; |
| 133 | const HistEvent *he; |
| 134 | int lflg = 0, nflg = 0, rflg = 0, sflg = 0; |
| 135 | int i; |
| 136 | char *firststr, *laststr; |
| 137 | int first, last, direction; |
| 138 | char *pat = NULL, *repl; /* ksh "fc old=new" crap */ |
| 139 | static int active = 0; |
| 140 | struct jmploc jmploc; |
| 141 | struct jmploc *volatile savehandler; |
| 142 | char editfile[MAXPATHLEN + 1]; |
| 143 | FILE *efp; |
| 144 | |
| 145 | if (hist == NULL) |
| 146 | error("history not active"); |
| 147 | |
| 148 | if (argc == 1) |
| 149 | error("missing history argument"); |
| 150 | |
| 151 | optreset = 1; optind = 1; /* initialize getopt */ |
| 152 | while (not_fcnumber(argv[optind]) && |
| 153 | (ch = getopt(argc, argv, ":e:lnrs")) != EOF) |
| 154 | switch ((char)ch) { |
| 155 | case 'e': |
| 156 | editor = optarg; |
| 157 | break; |
| 158 | case 'l': |
| 159 | lflg = 1; |
| 160 | break; |
| 161 | case 'n': |
| 162 | nflg = 1; |
| 163 | break; |
| 164 | case 'r': |
| 165 | rflg = 1; |
| 166 | break; |
| 167 | case 's': |
| 168 | sflg = 1; |
| 169 | break; |
| 170 | case ':': |
| 171 | error("option -%c expects argument", optopt); |
| 172 | case '?': |
| 173 | default: |
| 174 | error("unknown option: -%c", optopt); |
| 175 | } |
| 176 | argc -= optind, argv += optind; |
| 177 | |
| 178 | /* |
| 179 | * If executing... |
| 180 | */ |
| 181 | if (lflg == 0 || editor || sflg) { |
| 182 | lflg = 0; /* ignore */ |
| 183 | editfile[0] = '\0'; |
| 184 | /* |
| 185 | * Catch interrupts to reset active counter and |
| 186 | * cleanup temp files. |
| 187 | */ |
| 188 | if (setjmp(jmploc.loc)) { |
| 189 | active = 0; |
| 190 | if (*editfile) |
| 191 | unlink(editfile); |
| 192 | handler = savehandler; |
| 193 | longjmp(handler->loc, 1); |
| 194 | } |
| 195 | savehandler = handler; |
| 196 | handler = &jmploc; |
| 197 | if (++active > MAXHISTLOOPS) { |
| 198 | active = 0; |
| 199 | displayhist = 0; |
| 200 | error("called recursively too many times"); |
| 201 | } |
| 202 | /* |
| 203 | * Set editor. |
| 204 | */ |
| 205 | if (sflg == 0) { |
| 206 | if (editor == NULL && |
| 207 | (editor = bltinlookup("FCEDIT", 1)) == NULL && |
| 208 | (editor = bltinlookup("EDITOR", 1)) == NULL) |
| 209 | editor = DEFEDITOR; |
| 210 | if (editor[0] == '-' && editor[1] == '\0') { |
| 211 | sflg = 1; /* no edit */ |
| 212 | editor = NULL; |
| 213 | } |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * If executing, parse [old=new] now |
| 219 | */ |
| 220 | if (lflg == 0 && argc > 0 && |
| 221 | ((repl = strchr(argv[0], '=')) != NULL)) { |
| 222 | pat = argv[0]; |
| 223 | *repl++ = '\0'; |
| 224 | argc--, argv++; |
| 225 | } |
| 226 | /* |
| 227 | * determine [first] and [last] |
| 228 | */ |
| 229 | switch (argc) { |
| 230 | case 0: |
| 231 | firststr = lflg ? "-16" : "-1"; |
| 232 | laststr = "-1"; |
| 233 | break; |
| 234 | case 1: |
| 235 | firststr = argv[0]; |
| 236 | laststr = lflg ? "-1" : argv[0]; |
| 237 | break; |
| 238 | case 2: |
| 239 | firststr = argv[0]; |
| 240 | laststr = argv[1]; |
| 241 | break; |
| 242 | default: |
| 243 | error("too many args"); |
| 244 | } |
| 245 | /* |
| 246 | * Turn into event numbers. |
| 247 | */ |
| 248 | first = str_to_event(firststr, 0); |
| 249 | last = str_to_event(laststr, 1); |
| 250 | |
| 251 | if (rflg) { |
| 252 | i = last; |
| 253 | last = first; |
| 254 | first = i; |
| 255 | } |
| 256 | /* |
| 257 | * XXX - this should not depend on the event numbers |
| 258 | * always increasing. Add sequence numbers or offset |
| 259 | * to the history element in next (diskbased) release. |
| 260 | */ |
| 261 | direction = first < last ? H_PREV : H_NEXT; |
| 262 | |
| 263 | /* |
| 264 | * If editing, grab a temp file. |
| 265 | */ |
| 266 | if (editor) { |
| 267 | int fd; |
| 268 | INTOFF; /* easier */ |
| 269 | sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); |
| 270 | if ((fd = mkstemp(editfile)) < 0) |
| 271 | error("can't create temporary file %s", editfile); |
| 272 | if ((efp = fdopen(fd, "w")) == NULL) { |
| 273 | close(fd); |
| 274 | error("can't allocate stdio buffer for temp\n"); |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | /* |
| 279 | * Loop through selected history events. If listing or executing, |
| 280 | * do it now. Otherwise, put into temp file and call the editor |
| 281 | * after. |
| 282 | * |
| 283 | * The history interface needs rethinking, as the following |
| 284 | * convolutions will demonstrate. |
| 285 | */ |
| 286 | history(hist, H_FIRST); |
| 287 | he = history(hist, H_NEXT_EVENT, first); |
| 288 | for (;he != NULL; he = history(hist, direction)) { |
| 289 | if (lflg) { |
| 290 | if (!nflg) |
| 291 | out1fmt("%5d ", he->num); |
| 292 | out1str(he->str); |
| 293 | } else { |
| 294 | char *s = pat ? |
| 295 | fc_replace(he->str, pat, repl) : (char *)he->str; |
| 296 | |
| 297 | if (sflg) { |
| 298 | if (displayhist) { |
| 299 | out2str(s); |
| 300 | } |
| 301 | evalstring(s); |
| 302 | if (displayhist && hist) { |
| 303 | /* |
| 304 | * XXX what about recursive and |
| 305 | * relative histnums. |
| 306 | */ |
| 307 | history(hist, H_ENTER, s); |
| 308 | } |
| 309 | } else |
| 310 | fputs(s, efp); |
| 311 | } |
| 312 | /* |
| 313 | * At end? (if we were to loose last, we'd sure be |
| 314 | * messed up). |
| 315 | */ |
| 316 | if (he->num == last) |
| 317 | break; |
| 318 | } |
| 319 | if (editor) { |
| 320 | char *editcmd; |
| 321 | |
| 322 | fclose(efp); |
| 323 | editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); |
| 324 | sprintf(editcmd, "%s %s", editor, editfile); |
| 325 | evalstring(editcmd); /* XXX - should use no JC command */ |
| 326 | INTON; |
| 327 | readcmdfile(editfile); /* XXX - should read back - quick tst */ |
| 328 | unlink(editfile); |
| 329 | } |
| 330 | |
| 331 | if (lflg == 0 && active > 0) |
| 332 | --active; |
| 333 | if (displayhist) |
| 334 | displayhist = 0; |
| 335 | } |
| 336 | |
| 337 | STATIC char * |
| 338 | fc_replace(s, p, r) |
| 339 | const char *s; |
| 340 | char *p, *r; |
| 341 | { |
| 342 | char *dest; |
| 343 | int plen = strlen(p); |
| 344 | |
| 345 | STARTSTACKSTR(dest); |
| 346 | while (*s) { |
| 347 | if (*s == *p && strncmp(s, p, plen) == 0) { |
| 348 | while (*r) |
| 349 | STPUTC(*r++, dest); |
| 350 | s += plen; |
| 351 | *p = '\0'; /* so no more matches */ |
| 352 | } else |
| 353 | STPUTC(*s++, dest); |
| 354 | } |
| 355 | STACKSTRNUL(dest); |
| 356 | dest = grabstackstr(dest); |
| 357 | |
| 358 | return (dest); |
| 359 | } |
| 360 | |
| 361 | not_fcnumber(s) |
| 362 | char *s; |
| 363 | { |
| 364 | if (*s == '-') |
| 365 | s++; |
| 366 | return (!is_number(s)); |
| 367 | } |
| 368 | |
| 369 | str_to_event(str, last) |
| 370 | char *str; |
| 371 | int last; |
| 372 | { |
| 373 | const HistEvent *he; |
| 374 | char *s = str; |
| 375 | int relative = 0; |
| 376 | int i, j; |
| 377 | |
| 378 | he = history(hist, H_FIRST); |
| 379 | switch (*s) { |
| 380 | case '-': |
| 381 | relative = 1; |
| 382 | /*FALLTHROUGH*/ |
| 383 | case '+': |
| 384 | s++; |
| 385 | } |
| 386 | if (is_number(s)) { |
| 387 | i = atoi(s); |
| 388 | if (relative) { |
| 389 | while (he != NULL && i--) { |
| 390 | he = history(hist, H_NEXT); |
| 391 | } |
| 392 | if (he == NULL) |
| 393 | he = history(hist, H_LAST); |
| 394 | } else { |
| 395 | he = history(hist, H_NEXT_EVENT, i); |
| 396 | if (he == NULL) { |
| 397 | /* |
| 398 | * the notion of first and last is |
| 399 | * backwards to that of the history package |
| 400 | */ |
| 401 | he = history(hist, last ? H_FIRST : H_LAST); |
| 402 | } |
| 403 | } |
| 404 | if (he == NULL) |
| 405 | error("history number %s not found (internal error)", |
| 406 | str); |
| 407 | } else { |
| 408 | /* |
| 409 | * pattern |
| 410 | */ |
| 411 | he = history(hist, H_PREV_STR, str); |
| 412 | if (he == NULL) |
| 413 | error("history pattern not found: %s", str); |
| 414 | } |
| 415 | return (he->num); |
| 416 | } |