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