1 /* $NetBSD: read.c,v 1.4 1997/04/11 17:52:47 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Christos Zoulas of Cornell University. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #if !defined(lint) && !defined(SCCSID) 40 #if 0 41 static char sccsid[] = "@(#)read.c 8.1 (Berkeley) 6/4/93"; 42 #else 43 static char rcsid[] = "$NetBSD: read.c,v 1.4 1997/04/11 17:52:47 christos Exp $"; 44 #endif 45 #endif /* not lint && not SCCSID */ 46 47 /* 48 * read.c: Clean this junk up! This is horrible code. 49 * Terminal read functions 50 */ 51 #include "sys.h" 52 #include <sys/errno.h> 53 #include <unistd.h> 54 #include <stdlib.h> 55 extern int errno; 56 #include "el.h" 57 58 #define OKCMD -1 59 60 private int read__fixio __P((int, int)); 61 private int read_preread __P((EditLine *)); 62 private int read_getcmd __P((EditLine *, el_action_t *, char *)); 63 64 #ifdef DEBUG_EDIT 65 private void 66 read_debug(el) 67 EditLine *el; 68 { 69 70 if (el->el_line.cursor > el->el_line.lastchar) 71 (void) fprintf(el->el_errfile, "cursor > lastchar\r\n"); 72 if (el->el_line.cursor < el->el_line.buffer) 73 (void) fprintf(el->el_errfile, "cursor < buffer\r\n"); 74 if (el->el_line.cursor > el->el_line.limit) 75 (void) fprintf(el->el_errfile, "cursor > limit\r\n"); 76 if (el->el_line.lastchar > el->el_line.limit) 77 (void) fprintf(el->el_errfile, "lastchar > limit\r\n"); 78 if (el->el_line.limit != &el->el_line.buffer[EL_BUFSIZ - 2]) 79 (void) fprintf(el->el_errfile, "limit != &buffer[EL_BUFSIZ-2]\r\n"); 80 } 81 #endif /* DEBUG_EDIT */ 82 83 /* read__fixio(): 84 * Try to recover from a read error 85 */ 86 private int 87 read__fixio(fd, e) 88 int fd, e; 89 { 90 switch (e) { 91 case -1: /* Make sure that the code is reachable */ 92 93 #ifdef EWOULDBLOCK 94 case EWOULDBLOCK: 95 # ifndef TRY_AGAIN 96 # define TRY_AGAIN 97 # endif 98 #endif /* EWOULDBLOCK */ 99 100 #if defined(POSIX) && defined(EAGAIN) 101 # if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN 102 case EAGAIN: 103 # ifndef TRY_AGAIN 104 # define TRY_AGAIN 105 # endif 106 # endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */ 107 #endif /* POSIX && EAGAIN */ 108 109 e = 0; 110 #ifdef TRY_AGAIN 111 # if defined(F_SETFL) && defined(O_NDELAY) 112 if ((e = fcntl(fd, F_GETFL, 0)) == -1) 113 return -1; 114 115 if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1) 116 return -1; 117 else 118 e = 1; 119 # endif /* F_SETFL && O_NDELAY */ 120 121 # ifdef FIONBIO 122 if (ioctl(fd, FIONBIO, (ioctl_t) &e) == -1) 123 return -1; 124 else 125 e = 1; 126 # endif /* FIONBIO */ 127 128 #endif /* TRY_AGAIN */ 129 return e ? 0 : -1; 130 131 case EINTR: 132 return 0; 133 134 default: 135 return -1; 136 } 137 } 138 139 140 /* read_preread(): 141 * Try to read the stuff in the input queue; 142 */ 143 private int 144 read_preread(el) 145 EditLine *el; 146 { 147 int chrs = 0; 148 149 if (el->el_chared.c_macro.nline) { 150 el_free((ptr_t) el->el_chared.c_macro.nline); 151 el->el_chared.c_macro.nline = NULL; 152 } 153 154 if (el->el_tty.t_mode == ED_IO) 155 return 0; 156 157 #ifdef FIONREAD 158 (void) ioctl(el->el_infd, FIONREAD, (ioctl_t) &chrs); 159 if (chrs > 0) { 160 char buf[EL_BUFSIZ]; 161 162 chrs = read(el->el_infd, buf, (size_t) MIN(chrs, EL_BUFSIZ - 1)); 163 if (chrs > 0) { 164 buf[chrs] = '\0'; 165 el->el_chared.c_macro.nline = strdup(buf); 166 el_push(el->el_chared.c_macro.nline); 167 } 168 } 169 #endif /* FIONREAD */ 170 171 return chrs > 0; 172 } 173 174 175 /* el_push(): 176 * Push a macro 177 */ 178 public void 179 el_push(el, str) 180 EditLine *el; 181 const char *str; 182 { 183 c_macro_t *ma = &el->el_chared.c_macro; 184 185 if (str != NULL && ma->level + 1 < EL_MAXMACRO) { 186 ma->level++; 187 ma->macro[ma->level] = (char *) str; 188 } 189 else { 190 term_beep(el); 191 term__flush(); 192 } 193 } 194 195 196 /* read_getcmd(): 197 * Return next command from the input stream. 198 */ 199 private int 200 read_getcmd(el, cmdnum, ch) 201 EditLine *el; 202 el_action_t *cmdnum; 203 char *ch; 204 { 205 el_action_t cmd = 0; 206 int num; 207 208 while (cmd == 0 || cmd == ED_SEQUENCE_LEAD_IN) { 209 if ((num = el_getc(el, ch)) != 1) /* if EOF or error */ 210 return num; 211 212 #ifdef KANJI 213 if ((*ch & 0200)) { 214 el->el_state.metanext = 0; 215 cmd = CcViMap[' ']; 216 break; 217 } 218 else 219 #endif /* KANJI */ 220 221 if (el->el_state.metanext) { 222 el->el_state.metanext = 0; 223 *ch |= 0200; 224 } 225 cmd = el->el_map.current[(unsigned char) *ch]; 226 if (cmd == ED_SEQUENCE_LEAD_IN) { 227 key_value_t val; 228 switch (key_get(el, ch, &val)) { 229 case XK_CMD: 230 cmd = val.cmd; 231 break; 232 case XK_STR: 233 el_push(el, val.str); 234 break; 235 #ifdef notyet 236 case XK_EXE: 237 /* XXX: In the future to run a user function */ 238 RunCommand(val.str); 239 break; 240 #endif 241 default: 242 abort(); 243 break; 244 } 245 } 246 if (el->el_map.alt == NULL) 247 el->el_map.current = el->el_map.key; 248 } 249 *cmdnum = cmd; 250 return OKCMD; 251 } 252 253 254 /* el_getc(): 255 * Read a character 256 */ 257 public int 258 el_getc(el, cp) 259 EditLine *el; 260 char *cp; 261 { 262 int num_read; 263 unsigned char tcp; 264 int tried = 0; 265 266 c_macro_t *ma = &el->el_chared.c_macro; 267 268 term__flush(); 269 for (;;) { 270 if (ma->level < 0) { 271 if (!read_preread(el)) 272 break; 273 } 274 if (ma->level < 0) 275 break; 276 277 if (*ma->macro[ma->level] == 0) { 278 ma->level--; 279 continue; 280 } 281 *cp = *ma->macro[ma->level]++ & 0377; 282 if (*ma->macro[ma->level] == 0) { /* Needed for QuoteMode On */ 283 ma->level--; 284 } 285 return 1; 286 } 287 288 #ifdef DEBUG_READ 289 (void) fprintf(el->el_errfile, "Turning raw mode on\n"); 290 #endif /* DEBUG_READ */ 291 if (tty_rawmode(el) < 0) /* make sure the tty is set up correctly */ 292 return 0; 293 294 #ifdef DEBUG_READ 295 (void) fprintf(el->el_errfile, "Reading a character\n"); 296 #endif /* DEBUG_READ */ 297 while ((num_read = read(el->el_infd, (char *) &tcp, 1)) == -1) 298 if (!tried && read__fixio(el->el_infd, errno) == 0) 299 tried = 1; 300 else { 301 *cp = '\0'; 302 return -1; 303 } 304 #ifdef DEBUG_READ 305 (void) fprintf(el->el_errfile, "Got it %c\n", tcp); 306 #endif /* DEBUG_READ */ 307 *cp = tcp; 308 return num_read; 309 } 310 311 312 313 public const char * 314 el_gets(el, nread) 315 EditLine *el; 316 int *nread; 317 { 318 int retval; 319 el_action_t cmdnum = 0; 320 int num; /* how many chars we have read at NL */ 321 char ch; 322 323 if (el->el_flags & HANDLE_SIGNALS) 324 sig_set(el); 325 326 re_clear_display(el); /* reset the display stuff */ 327 ch_reset(el); 328 329 #ifdef FIONREAD 330 if (el->el_tty.t_mode == EX_IO && ma->level < 0) { 331 long chrs = 0; 332 333 (void) ioctl(el->el_infd, FIONREAD, (ioctl_t) &chrs); 334 if (chrs == 0) { 335 if (tty_rawmode(el) < 0) { 336 if (nread) 337 *nread = 0; 338 return NULL; 339 } 340 } 341 } 342 #endif /* FIONREAD */ 343 344 re_refresh(el); /* print the prompt */ 345 346 for (num = OKCMD; num == OKCMD;) { /* while still editing this line */ 347 #ifdef DEBUG_EDIT 348 read_debug(el); 349 #endif /* DEBUG_EDIT */ 350 /* if EOF or error */ 351 if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) { 352 #ifdef DEBUG_READ 353 (void) fprintf(el->el_errfile, "Returning from el_gets %d\n", num); 354 #endif /* DEBUG_READ */ 355 break; 356 } 357 358 if (cmdnum >= el->el_map.nfunc) { /* BUG CHECK command */ 359 #ifdef DEBUG_EDIT 360 (void) fprintf(el->el_errfile, 361 "ERROR: illegal command from key 0%o\r\n", ch); 362 #endif /* DEBUG_EDIT */ 363 continue; /* try again */ 364 } 365 366 /* now do the real command */ 367 #ifdef DEBUG_READ 368 { 369 el_bindings_t *b; 370 for (b = el->el_map.help; b->name; b++) 371 if (b->func == cmdnum) 372 break; 373 if (b->name) 374 (void) fprintf(el->el_errfile, "Executing %s\n", b->name); 375 else 376 (void) fprintf(el->el_errfile, "Error command = %d\n", cmdnum); 377 } 378 #endif /* DEBUG_READ */ 379 retval = (*el->el_map.func[cmdnum])(el, ch); 380 381 /* save the last command here */ 382 el->el_state.lastcmd = cmdnum; 383 384 /* use any return value */ 385 switch (retval) { 386 case CC_CURSOR: 387 el->el_state.argument = 1; 388 el->el_state.doingarg = 0; 389 re_refresh_cursor(el); 390 break; 391 392 case CC_REDISPLAY: 393 re_clear_lines(el); 394 re_clear_display(el); 395 /* FALLTHROUGH */ 396 397 case CC_REFRESH: 398 el->el_state.argument = 1; 399 el->el_state.doingarg = 0; 400 re_refresh(el); 401 break; 402 403 case CC_NORM: /* normal char */ 404 el->el_state.argument = 1; 405 el->el_state.doingarg = 0; 406 break; 407 408 case CC_ARGHACK: /* Suggested by Rich Salz */ 409 /* <rsalz@pineapple.bbn.com> */ 410 break; /* keep going... */ 411 412 case CC_EOF: /* end of file typed */ 413 num = 0; 414 break; 415 416 case CC_NEWLINE: /* normal end of line */ 417 num = el->el_line.lastchar - el->el_line.buffer; 418 break; 419 420 case CC_FATAL: /* fatal error, reset to known state */ 421 #ifdef DEBUG_READ 422 (void) fprintf(el->el_errfile, "*** editor fatal ERROR ***\r\n\n"); 423 #endif /* DEBUG_READ */ 424 /* put (real) cursor in a known place */ 425 re_clear_display(el); /* reset the display stuff */ 426 ch_reset(el); /* reset the input pointers */ 427 re_refresh(el); /* print the prompt again */ 428 el->el_state.argument = 1; 429 el->el_state.doingarg = 0; 430 break; 431 432 case CC_ERROR: 433 default: /* functions we don't know about */ 434 #ifdef DEBUG_READ 435 (void) fprintf(el->el_errfile, "*** editor ERROR ***\r\n\n"); 436 #endif /* DEBUG_READ */ 437 el->el_state.argument = 1; 438 el->el_state.doingarg = 0; 439 term_beep(el); 440 term__flush(); 441 break; 442 } 443 } 444 445 (void) tty_cookedmode(el); /* make sure the tty is set up correctly */ 446 term__flush(); /* flush any buffered output */ 447 if (el->el_flags & HANDLE_SIGNALS) 448 sig_clr(el); 449 if (nread) 450 *nread = num; 451 return num ? el->el_line.buffer : NULL; 452 } 453