1 /* $OpenBSD: db_input.c,v 1.8 2001/11/06 19:53:18 miod Exp $ */ 2 /* $NetBSD: db_input.c,v 1.7 1996/02/05 01:57:02 christos Exp $ */ 3 4 /* 5 * Mach Operating System 6 * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University 7 * All Rights Reserved. 8 * 9 * Permission to use, copy, modify and distribute this software and its 10 * documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 17 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie Mellon 27 * the rights to redistribute these changes. 28 * 29 * Author: David B. Golub, Carnegie Mellon University 30 * Date: 7/90 31 */ 32 33 #include <sys/param.h> 34 #include <sys/proc.h> 35 36 #include <uvm/uvm_extern.h> 37 38 #include <machine/db_machdep.h> 39 40 #include <ddb/db_var.h> 41 #include <ddb/db_output.h> 42 #include <ddb/db_command.h> 43 #include <ddb/db_sym.h> 44 #include <ddb/db_extern.h> 45 46 #include <dev/cons.h> 47 48 /* 49 * Character input and editing. 50 */ 51 52 /* 53 * We don't track output position while editing input, 54 * since input always ends with a new-line. We just 55 * reset the line position at the end. 56 */ 57 char * db_lbuf_start; /* start of input line buffer */ 58 char * db_lbuf_end; /* end of input line buffer */ 59 char * db_lc; /* current character */ 60 char * db_le; /* one past last character */ 61 #if DB_HISTORY_SIZE != 0 62 char db_history[DB_HISTORY_SIZE]; /* start of history buffer */ 63 int db_history_size = DB_HISTORY_SIZE;/* size of history buffer */ 64 char * db_history_curr = db_history; /* start of current line */ 65 char * db_history_last = db_history; /* start of last line */ 66 char * db_history_prev = (char *) 0; /* start of previous line */ 67 #endif 68 69 70 #define CTRL(c) ((c) & 0x1f) 71 #define isspace(c) ((c) == ' ' || (c) == '\t') 72 #define BLANK ' ' 73 #define BACKUP '\b' 74 75 static int cnmaygetc __P((void)); 76 77 void 78 db_putstring(s, count) 79 char *s; 80 int count; 81 { 82 while (--count >= 0) 83 cnputc(*s++); 84 } 85 86 void 87 db_putnchars(c, count) 88 int c; 89 int count; 90 { 91 while (--count >= 0) 92 cnputc(c); 93 } 94 95 /* 96 * Delete N characters, forward or backward 97 */ 98 #define DEL_FWD 0 99 #define DEL_BWD 1 100 void 101 db_delete(n, bwd) 102 int n; 103 int bwd; 104 { 105 register char *p; 106 107 if (bwd) { 108 db_lc -= n; 109 db_putnchars(BACKUP, n); 110 } 111 for (p = db_lc; p < db_le-n; p++) { 112 *p = *(p+n); 113 cnputc(*p); 114 } 115 db_putnchars(BLANK, n); 116 db_putnchars(BACKUP, db_le - db_lc); 117 db_le -= n; 118 } 119 120 void 121 db_delete_line(void) 122 { 123 db_delete(db_le - db_lc, DEL_FWD); 124 db_delete(db_lc - db_lbuf_start, DEL_BWD); 125 db_le = db_lc = db_lbuf_start; 126 } 127 128 #if DB_HISTORY_SIZE != 0 129 #define INC_DB_CURR() \ 130 do { \ 131 db_history_curr++; \ 132 if (db_history_curr > \ 133 db_history + db_history_size - 1) \ 134 db_history_curr = db_history; \ 135 } while (0) 136 #define DEC_DB_CURR() \ 137 do { \ 138 db_history_curr--; \ 139 if (db_history_curr < db_history) \ 140 db_history_curr = db_history + \ 141 db_history_size - 1; \ 142 } while (0) 143 #endif 144 145 /* returns TRUE at end-of-line */ 146 int 147 db_inputchar(c) 148 int c; 149 { 150 switch (c) { 151 case CTRL('b'): 152 /* back up one character */ 153 if (db_lc > db_lbuf_start) { 154 cnputc(BACKUP); 155 db_lc--; 156 } 157 break; 158 case CTRL('f'): 159 /* forward one character */ 160 if (db_lc < db_le) { 161 cnputc(*db_lc); 162 db_lc++; 163 } 164 break; 165 case CTRL('a'): 166 /* beginning of line */ 167 while (db_lc > db_lbuf_start) { 168 cnputc(BACKUP); 169 db_lc--; 170 } 171 break; 172 case CTRL('e'): 173 /* end of line */ 174 while (db_lc < db_le) { 175 cnputc(*db_lc); 176 db_lc++; 177 } 178 break; 179 case CTRL('w'): 180 /* erase word back */ 181 while (db_lc > db_lbuf_start && db_lc[-1] != BLANK) 182 db_delete(1, DEL_BWD); 183 break; 184 case CTRL('h'): 185 case 0177: 186 /* erase previous character */ 187 if (db_lc > db_lbuf_start) 188 db_delete(1, DEL_BWD); 189 break; 190 case CTRL('d'): 191 /* erase next character */ 192 if (db_lc < db_le) 193 db_delete(1, DEL_FWD); 194 break; 195 case CTRL('k'): 196 /* delete to end of line */ 197 if (db_lc < db_le) 198 db_delete(db_le - db_lc, DEL_FWD); 199 break; 200 case CTRL('u'): 201 /* delete line */ 202 db_delete_line(); 203 break; 204 case CTRL('t'): 205 /* twiddle last 2 characters */ 206 if (db_lc >= db_lbuf_start + 2) { 207 c = db_lc[-2]; 208 db_lc[-2] = db_lc[-1]; 209 db_lc[-1] = c; 210 cnputc(BACKUP); 211 cnputc(BACKUP); 212 cnputc(db_lc[-2]); 213 cnputc(db_lc[-1]); 214 } 215 break; 216 #if DB_HISTORY_SIZE != 0 217 case CTRL('p'): 218 DEC_DB_CURR(); 219 while (db_history_curr != db_history_last) { 220 DEC_DB_CURR(); 221 if (*db_history_curr == '\0') 222 break; 223 } 224 db_delete_line(); 225 if (db_history_curr == db_history_last) { 226 INC_DB_CURR(); 227 db_le = db_lc = db_lbuf_start; 228 } else { 229 register char *p; 230 INC_DB_CURR(); 231 for (p = db_history_curr, db_le = db_lbuf_start;*p; ) { 232 *db_le++ = *p++; 233 if (p == db_history + db_history_size) 234 p = db_history; 235 } 236 db_lc = db_le; 237 } 238 db_putstring(db_lbuf_start, db_le - db_lbuf_start); 239 break; 240 case CTRL('n'): 241 while (db_history_curr != db_history_last) { 242 if (*db_history_curr == '\0') 243 break; 244 INC_DB_CURR(); 245 } 246 if (db_history_curr != db_history_last) { 247 INC_DB_CURR(); 248 db_delete_line(); 249 if (db_history_curr != db_history_last) { 250 register char *p; 251 for (p = db_history_curr, 252 db_le = db_lbuf_start; *p;) { 253 *db_le++ = *p++; 254 if (p == db_history + db_history_size) 255 p = db_history; 256 } 257 db_lc = db_le; 258 } 259 db_putstring(db_lbuf_start, db_le - db_lbuf_start); 260 } 261 break; 262 #endif 263 case CTRL('r'): 264 db_putstring("^R\n", 3); 265 if (db_le > db_lbuf_start) { 266 db_putstring(db_lbuf_start, db_le - db_lbuf_start); 267 db_putnchars(BACKUP, db_le - db_lc); 268 } 269 break; 270 case '\n': 271 case '\r': 272 #if DB_HISTORY_SIZE != 0 273 /* 274 * Check whether current line is the same 275 * as previous saved line. If it is, don`t 276 * save it. 277 */ 278 if (db_history_curr == db_history_prev) { 279 register char *pp, *pc; 280 281 /* 282 * Is it the same? 283 */ 284 for (pp = db_history_prev, pc = db_lbuf_start; 285 pc != db_le && *pp; ) { 286 if (*pp != *pc) 287 break; 288 if (++pp == db_history + db_history_size) 289 pp = db_history; 290 pc++; 291 } 292 if (!*pp && pc == db_le) { 293 /* 294 * Repeated previous line. Don`t save. 295 */ 296 db_history_curr = db_history_last; 297 *db_le++ = c; 298 return TRUE; 299 } 300 } 301 if (db_le != db_lbuf_start) { 302 register char *p; 303 db_history_prev = db_history_last; 304 for (p = db_lbuf_start; p != db_le; p++) { 305 *db_history_last++ = *p; 306 if (db_history_last == 307 db_history + db_history_size) 308 db_history_last = db_history; 309 } 310 *db_history_last++ = '\0'; 311 } 312 db_history_curr = db_history_last; 313 #endif 314 *db_le++ = c; 315 return TRUE; 316 default: 317 if (db_le == db_lbuf_end) { 318 cnputc('\007'); 319 } 320 else if (c >= ' ' && c <= '~') { 321 register char *p; 322 323 for (p = db_le; p > db_lc; p--) 324 *p = *(p-1); 325 *db_lc++ = c; 326 db_le++; 327 cnputc(c); 328 db_putstring(db_lc, db_le - db_lc); 329 db_putnchars(BACKUP, db_le - db_lc); 330 } 331 break; 332 } 333 return FALSE; 334 } 335 336 int 337 db_readline(lstart, lsize) 338 char * lstart; 339 int lsize; 340 { 341 db_force_whitespace(); /* synch output position */ 342 343 db_lbuf_start = lstart; 344 db_lbuf_end = lstart + lsize - 1; 345 db_lc = lstart; 346 db_le = lstart; 347 348 while (!db_inputchar(cngetc())) 349 continue; 350 351 db_putchar('\n'); /* synch output position */ 352 353 *db_le = 0; 354 return (db_le - db_lbuf_start); 355 } 356 357 void 358 db_check_interrupt(void) 359 { 360 register int c; 361 362 c = cnmaygetc(); 363 switch (c) { 364 case -1: /* no character */ 365 return; 366 367 case CTRL('c'): 368 db_error((char *)0); 369 /*NOTREACHED*/ 370 371 case CTRL('s'): 372 do { 373 c = cnmaygetc(); 374 if (c == CTRL('c')) 375 db_error(NULL); 376 /*NOTREACHED*/ 377 } while (c != CTRL('q')); 378 break; 379 380 default: 381 /* drop on floor */ 382 break; 383 } 384 } 385 386 static int 387 cnmaygetc () 388 { 389 return (-1); 390 } 391