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 optreset = 1; optind = 1; /* initialize getopt */ 135 while (not_fcnumber(argv[optind]) && 136 (ch = getopt(argc, argv, ":e:lnrs")) != EOF) 137 switch ((char)ch) { 138 case 'e': 139 editor = optarg; 140 break; 141 case 'l': 142 lflg = 1; 143 break; 144 case 'n': 145 nflg = 1; 146 break; 147 case 'r': 148 rflg = 1; 149 break; 150 case 's': 151 sflg = 1; 152 break; 153 case ':': 154 error("option -%c expects argument", optopt); 155 case '?': 156 default: 157 error("unknown option: -%c", optopt); 158 } 159 argc -= optind, argv += optind; 160 161 /* 162 * If executing... 163 */ 164 if (lflg == 0 || editor || sflg) { 165 lflg = 0; /* ignore */ 166 editfile[0] = '\0'; 167 /* 168 * Catch interrupts to reset active counter and 169 * cleanup temp files. 170 */ 171 if (setjmp(jmploc.loc)) { 172 active = 0; 173 if (*editfile) 174 unlink(editfile); 175 handler = savehandler; 176 longjmp(handler->loc, 1); 177 } 178 savehandler = handler; 179 handler = &jmploc; 180 if (++active > MAXHISTLOOPS) { 181 active = 0; 182 displayhist = 0; 183 error("called recursively too many times"); 184 } 185 /* 186 * Set editor. 187 */ 188 if (sflg == 0) { 189 if (editor == NULL && 190 (editor = bltinlookup("FCEDIT", 1)) == NULL && 191 (editor = bltinlookup("EDITOR", 1)) == NULL) 192 editor = DEFEDITOR; 193 if (editor[0] == '-' && editor[1] == '\0') { 194 sflg = 1; /* no edit */ 195 editor = NULL; 196 } 197 } 198 } 199 200 /* 201 * If executing, parse [old=new] now 202 */ 203 if (lflg == 0 && argc > 0 && 204 ((repl = strchr(argv[0], '=')) != NULL)) { 205 pat = argv[0]; 206 *repl++ = '\0'; 207 argc--, argv++; 208 } 209 /* 210 * determine [first] and [last] 211 */ 212 switch (argc) { 213 case 0: 214 firststr = lflg ? "-16" : "-1"; 215 laststr = "-1"; 216 break; 217 case 1: 218 firststr = argv[0]; 219 laststr = lflg ? "-1" : argv[0]; 220 break; 221 case 2: 222 firststr = argv[0]; 223 laststr = argv[1]; 224 break; 225 default: 226 error("too many args"); 227 } 228 /* 229 * Turn into event numbers. 230 */ 231 first = str_to_event(firststr, 0); 232 last = str_to_event(laststr, 1); 233 234 if (rflg) { 235 i = last; 236 last = first; 237 first = i; 238 } 239 /* 240 * XXX - this should not depend on the event numbers 241 * always increasing. Add sequence numbers or offset 242 * to the history element in next (diskbased) release. 243 */ 244 direction = first < last ? H_PREV : H_NEXT; 245 246 /* 247 * If editing, grab a temp file. 248 */ 249 if (editor) { 250 int fd; 251 INTOFF; /* easier */ 252 sprintf(editfile, "%s/_shXXXXXX", _PATH_TMP); 253 if ((fd = mkstemp(editfile)) < 0) 254 error("can't create temporary file %s", editfile); 255 if ((efp = fdopen(fd, "w")) == NULL) { 256 close(fd); 257 error("can't allocate stdio buffer for temp\n"); 258 } 259 } 260 261 /* 262 * Loop through selected history events. If listing or executing, 263 * do it now. Otherwise, put into temp file and call the editor 264 * after. 265 * 266 * The history interface needs rethinking, as the following 267 * convolutions will demonstrate. 268 */ 269 history(hist, H_FIRST); 270 he = history(hist, H_NEXT_EVENT, first); 271 for (;he != NULL; he = history(hist, direction)) { 272 if (lflg) { 273 if (!nflg) 274 out1fmt("%5d ", he->num); 275 out1str(he->str); 276 } else { 277 char *s = pat ? 278 fc_replace(he->str, pat, repl) : (char *)he->str; 279 280 if (sflg) { 281 if (displayhist) { 282 out2str(s); 283 } 284 evalstring(s); 285 if (displayhist && hist) { 286 /* 287 * XXX what about recursive and 288 * relative histnums. 289 */ 290 history(hist, H_ENTER, s); 291 } 292 } else 293 fputs(s, efp); 294 } 295 /* 296 * At end? (if we were to loose last, we'd sure be 297 * messed up). 298 */ 299 if (he->num == last) 300 break; 301 } 302 if (editor) { 303 char *editcmd; 304 305 fclose(efp); 306 editcmd = stalloc(strlen(editor) + strlen(editfile) + 2); 307 sprintf(editcmd, "%s %s", editor, editfile); 308 evalstring(editcmd); /* XXX - should use no JC command */ 309 INTON; 310 readcmdfile(editfile); /* XXX - should read back - quick tst */ 311 unlink(editfile); 312 } 313 314 if (lflg == 0 && active > 0) 315 --active; 316 if (displayhist) 317 displayhist = 0; 318 } 319 320 STATIC char * 321 fc_replace(s, p, r) 322 const char *s; 323 char *p, *r; 324 { 325 char *dest; 326 int plen = strlen(p); 327 328 STARTSTACKSTR(dest); 329 while (*s) { 330 if (*s == *p && strncmp(s, p, plen) == 0) { 331 while (*r) 332 STPUTC(*r++, dest); 333 s += plen; 334 *p = '\0'; /* so no more matches */ 335 } else 336 STPUTC(*s++, dest); 337 } 338 STACKSTRNUL(dest); 339 dest = grabstackstr(dest); 340 341 return (dest); 342 } 343 344 not_fcnumber(s) 345 char *s; 346 { 347 if (*s == '-') 348 s++; 349 return (!is_number(s)); 350 } 351 352 str_to_event(str, last) 353 char *str; 354 int last; 355 { 356 const HistEvent *he; 357 char *s = str; 358 int relative = 0; 359 int i, j; 360 361 he = history(hist, H_FIRST); 362 switch (*s) { 363 case '-': 364 relative = 1; 365 /*FALLTHROUGH*/ 366 case '+': 367 s++; 368 } 369 if (is_number(s)) { 370 i = atoi(s); 371 if (relative) { 372 while (he != NULL && i--) { 373 he = history(hist, H_NEXT); 374 } 375 if (he == NULL) 376 he = history(hist, H_LAST); 377 } else { 378 he = history(hist, H_NEXT_EVENT, i); 379 if (he == NULL) { 380 /* 381 * the notion of first and last is 382 * backwards to that of the history package 383 */ 384 he = history(hist, last ? H_FIRST : H_LAST); 385 } 386 } 387 if (he == NULL) 388 error("history number %s not found (internal error)", 389 str); 390 } else { 391 /* 392 * pattern 393 */ 394 he = history(hist, H_PREV_STR, str); 395 if (he == NULL) 396 error("history pattern not found: %s", str); 397 } 398 return (he->num); 399 } 400