db_input.c revision 104094
1139826Simp/* 253541Sshin * Mach Operating System 353541Sshin * Copyright (c) 1991,1990 Carnegie Mellon University 453541Sshin * All Rights Reserved. 553541Sshin * 653541Sshin * Permission to use, copy, modify and distribute this software and its 753541Sshin * documentation is hereby granted, provided that both the copyright 853541Sshin * notice and this permission notice appear in all copies of the 953541Sshin * software, derivative works or modified versions, and any portions 1053541Sshin * thereof, and that both notices appear in supporting documentation. 1153541Sshin * 1253541Sshin * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 1353541Sshin * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 1453541Sshin * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 1553541Sshin * 1653541Sshin * Carnegie Mellon requests users of this software to return to 1753541Sshin * 1853541Sshin * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 1953541Sshin * School of Computer Science 2053541Sshin * Carnegie Mellon University 2153541Sshin * Pittsburgh PA 15213-3890 2253541Sshin * 2353541Sshin * any improvements or extensions that they make and grant Carnegie the 2453541Sshin * rights to redistribute these changes. 2553541Sshin * 2653541Sshin * $FreeBSD: head/sys/ddb/db_input.c 104094 2002-09-28 17:15:38Z phk $ 2753541Sshin */ 28174510Sobrien 29174510Sobrien/* 3053541Sshin * Author: David B. Golub, Carnegie Mellon University 3153541Sshin * Date: 7/90 32174510Sobrien */ 33174510Sobrien 34174510Sobrien#include <sys/param.h> 3562587Sitojun#include <sys/systm.h> 3662587Sitojun#include <sys/cons.h> 37225044Sbz 3855009Sshin#include <ddb/ddb.h> 39148921Ssuz#include <ddb/db_output.h> 4053541Sshin 4153541Sshin/* 4253541Sshin * Character input and editing. 4378064Sume */ 4453541Sshin 4553541Sshin/* 4653541Sshin * We don't track output position while editing input, 4753541Sshin * since input always ends with a new-line. We just 4853541Sshin * reset the line position at the end. 4953541Sshin */ 5078064Sumestatic char * db_lbuf_start; /* start of input line buffer */ 5153541Sshinstatic char * db_lbuf_end; /* end of input line buffer */ 5253541Sshinstatic char * db_lc; /* current character */ 5353541Sshinstatic char * db_le; /* one past last character */ 54225044Sbz 5553541Sshin/* 5684994Sdarrenr * Simple input line history support. 5753541Sshin */ 5853541Sshinstatic char db_lhistory[2048]; 5953541Sshinstatic int db_lhistlsize, db_lhistidx, db_lhistcur; 6078064Sumestatic int db_lhist_nlines; 6178064Sume 6262587Sitojun#define CTRL(c) ((c) & 0x1f) 6378064Sume#define BLANK ' ' 6462587Sitojun#define BACKUP '\b' 6553541Sshin 66148385Sumestatic int cnmaygetc(void); 6762587Sitojunstatic void db_delete(int n, int bwd); 6853541Sshinstatic int db_inputchar(int c); 6953541Sshinstatic void db_putnchars(int c, int count); 7078064Sumestatic void db_putstring(char *s, int count); 7178064Sume 72171167Sgnnstatic void 73105199Ssamdb_putstring(s, count) 74105199Ssam char *s; 75105199Ssam int count; 76171167Sgnn{ 77105199Ssam while (--count >= 0) 7884994Sdarrenr cnputc(*s++); 7984994Sdarrenr} 8053541Sshin 8153541Sshinstatic void 8253541Sshindb_putnchars(c, count) 8353541Sshin int c; 8453541Sshin int count; 8553541Sshin{ 8653541Sshin while (--count >= 0) 8753541Sshin cnputc(c); 8853541Sshin} 8953541Sshin 9053541Sshin/* 9153541Sshin * Delete N characters, forward or backward 9253541Sshin */ 93171259Sdelphij#define DEL_FWD 0 9453541Sshin#define DEL_BWD 1 9553541Sshinstatic void 96122062Sumedb_delete(n, bwd) 97122062Sume int n; 98187989Sbz int bwd; 9953541Sshin{ 10062587Sitojun register char *p; 10162587Sitojun 102148385Sume if (bwd) { 103225044Sbz db_lc -= n; 104171167Sgnn db_putnchars(BACKUP, n); 10553541Sshin } 106122062Sume for (p = db_lc; p < db_le-n; p++) { 10753541Sshin *p = *(p+n); 108225044Sbz cnputc(*p); 109225044Sbz } 110225044Sbz db_putnchars(BLANK, n); 111225044Sbz db_putnchars(BACKUP, db_le - db_lc); 112225044Sbz db_le -= n; 113225044Sbz} 114165118Sbz 11553541Sshin/* returns TRUE at end-of-line */ 116171167Sgnnstatic int 11753541Sshindb_inputchar(c) 11853541Sshin int c; 11953541Sshin{ 12053541Sshin static int escstate; 12153541Sshin 12253541Sshin if (escstate == 1) { 12353541Sshin /* ESC seen, look for [ or O */ 12453541Sshin if (c == '[' || c == 'O') 125181803Sbz escstate++; 12653541Sshin else 12753541Sshin escstate = 0; /* re-init state machine */ 12853541Sshin return (0); 129171167Sgnn } else if (escstate == 2) { 13053541Sshin escstate = 0; 13178064Sume /* 13278064Sume * If a valid cursor key has been found, translate 13378064Sume * into an emacs-style control key, and fall through. 13478064Sume * Otherwise, drop off. 135120913Sume */ 13678064Sume switch (c) { 13762587Sitojun case 'A': /* up */ 13878064Sume c = CTRL('p'); 13978064Sume break; 140181803Sbz case 'B': /* down */ 14153541Sshin c = CTRL('n'); 142181803Sbz break; 143181803Sbz case 'C': /* right */ 14453541Sshin c = CTRL('f'); 14553541Sshin break; 14653541Sshin case 'D': /* left */ 147165118Sbz c = CTRL('b'); 148165118Sbz break; 14953541Sshin default: 15053541Sshin return (0); 15153541Sshin } 15253541Sshin } 15353541Sshin 15453541Sshin switch (c) { 15553541Sshin case CTRL('['): 156148921Ssuz escstate = 1; 157181803Sbz break; 158148921Ssuz case CTRL('b'): 15953541Sshin /* back up one character */ 16053541Sshin if (db_lc > db_lbuf_start) { 16153541Sshin cnputc(BACKUP); 16253541Sshin db_lc--; 16353541Sshin } 16453541Sshin break; 16553541Sshin case CTRL('f'): 16653541Sshin /* forward one character */ 167148921Ssuz if (db_lc < db_le) { 168148921Ssuz cnputc(*db_lc); 169148921Ssuz db_lc++; 170148921Ssuz } 17162587Sitojun break; 17262587Sitojun case CTRL('a'): 17362587Sitojun /* beginning of line */ 17462587Sitojun while (db_lc > db_lbuf_start) { 17562587Sitojun cnputc(BACKUP); 17662587Sitojun db_lc--; 17762587Sitojun } 17862587Sitojun break; 17962587Sitojun case CTRL('e'): 18062587Sitojun /* end of line */ 18162587Sitojun while (db_lc < db_le) { 182171167Sgnn cnputc(*db_lc); 18353541Sshin db_lc++; 184171133Sgnn } 185120913Sume break; 18653541Sshin case CTRL('h'): 187181803Sbz case 0177: 188181803Sbz /* erase previous character */ 18962587Sitojun if (db_lc > db_lbuf_start) 19062587Sitojun db_delete(1, DEL_BWD); 19162587Sitojun break; 19262587Sitojun case CTRL('d'): 19362587Sitojun /* erase next character */ 19462587Sitojun if (db_lc < db_le) 19562587Sitojun db_delete(1, DEL_FWD); 19653541Sshin break; 19753541Sshin case CTRL('u'): 19853541Sshin /* kill entire line: */ 19953541Sshin /* at first, delete to beginning of line */ 20053541Sshin if (db_lc > db_lbuf_start) 20153541Sshin db_delete(db_lc - db_lbuf_start, DEL_BWD); 20253541Sshin /* FALLTHROUGH */ 20353541Sshin case CTRL('k'): 20453541Sshin /* delete to end of line */ 20553541Sshin if (db_lc < db_le) 20653541Sshin db_delete(db_le - db_lc, DEL_FWD); 20753541Sshin break; 208181803Sbz case CTRL('t'): 209181803Sbz /* twiddle last 2 characters */ 210171133Sgnn if (db_lc >= db_lbuf_start + 2) { 21162587Sitojun c = db_lc[-2]; 21262587Sitojun db_lc[-2] = db_lc[-1]; 21362587Sitojun db_lc[-1] = c; 21462587Sitojun cnputc(BACKUP); 21562587Sitojun cnputc(BACKUP); 21662587Sitojun cnputc(db_lc[-2]); 21762587Sitojun cnputc(db_lc[-1]); 21853541Sshin } 21953541Sshin break; 22053541Sshin case CTRL('r'): 22153541Sshin db_putstring("^R\n", 3); 22253541Sshin redraw: 22353541Sshin if (db_le > db_lbuf_start) { 224171133Sgnn db_putstring(db_lbuf_start, db_le - db_lbuf_start); 22553541Sshin db_putnchars(BACKUP, db_le - db_lc); 22662587Sitojun } 22753541Sshin break; 22853541Sshin case CTRL('p'): 22953541Sshin /* Make previous history line the active one. */ 23053541Sshin if (db_lhistcur >= 0) { 231181803Sbz bcopy(db_lhistory + db_lhistcur * db_lhistlsize, 232171133Sgnn db_lbuf_start, db_lhistlsize); 23362587Sitojun db_lhistcur--; 23462587Sitojun goto hist_redraw; 23562587Sitojun } 23662587Sitojun break; 23762587Sitojun case CTRL('n'): 23862587Sitojun /* Make next history line the active one. */ 23962587Sitojun if (db_lhistcur < db_lhistidx - 1) { 24053541Sshin db_lhistcur += 2; 24153541Sshin bcopy(db_lhistory + db_lhistcur * db_lhistlsize, 24253541Sshin db_lbuf_start, db_lhistlsize); 24353541Sshin } else { 24453541Sshin /* 24553541Sshin * ^N through tail of history, reset the 24653541Sshin * buffer to zero length. 24753541Sshin */ 24853541Sshin *db_lbuf_start = '\0'; 24953541Sshin db_lhistcur = db_lhistidx; 250171133Sgnn } 25153541Sshin 25253541Sshin hist_redraw: 25353541Sshin db_putnchars(BACKUP, db_le - db_lbuf_start); 25453541Sshin db_putnchars(BLANK, db_le - db_lbuf_start); 255122062Sume db_putnchars(BACKUP, db_le - db_lbuf_start); 25653541Sshin db_le = index(db_lbuf_start, '\0'); 25753541Sshin if (db_le[-1] == '\r' || db_le[-1] == '\n') 25853541Sshin *--db_le = '\0'; 259122062Sume db_lc = db_le; 260122062Sume goto redraw; 261122062Sume 262122062Sume case -1: 263122062Sume /* 264122062Sume * eek! the console returned eof. 265122062Sume * probably that means we HAVE no console.. we should try bail 266122062Sume * XXX 267122062Sume */ 268126006Sume c = '\r'; 269126006Sume case '\n': 270126006Sume case '\r': 271126006Sume *db_le++ = c; 272122062Sume return (1); 273122062Sume default: 274122062Sume if (db_le == db_lbuf_end) { 275126006Sume cnputc('\007'); 276126006Sume } 277126006Sume else if (c >= ' ' && c <= '~') { 278126006Sume register char *p; 279126006Sume 280126006Sume for (p = db_le; p > db_lc; p--) 281126006Sume *p = *(p-1); 28253541Sshin *db_lc++ = c; 28353541Sshin db_le++; 28453541Sshin cnputc(c); 28553541Sshin db_putstring(db_lc, db_le - db_lc); 28653541Sshin db_putnchars(BACKUP, db_le - db_lc); 28753541Sshin } 28853541Sshin break; 28953541Sshin } 29053541Sshin return (0); 29153541Sshin} 29253541Sshin 29353541Sshinstatic int 29453541Sshincnmaygetc() 29553541Sshin{ 29653541Sshin return (-1); 297171133Sgnn} 29853541Sshin 29953541Sshinint 30053541Sshindb_readline(lstart, lsize) 30153541Sshin char * lstart; 30253541Sshin int lsize; 30353541Sshin{ 30453541Sshin if (lsize != db_lhistlsize) { 30553541Sshin /* 30653541Sshin * (Re)initialize input line history. Throw away any 30753541Sshin * existing history. 30853541Sshin */ 30953541Sshin db_lhist_nlines = sizeof(db_lhistory) / lsize; 310120913Sume db_lhistlsize = lsize; 31153541Sshin db_lhistidx = -1; 31253541Sshin } 31353541Sshin db_lhistcur = db_lhistidx; 31453541Sshin 315181803Sbz db_force_whitespace(); /* synch output position */ 31662587Sitojun 31762587Sitojun db_lbuf_start = lstart; 31862587Sitojun db_lbuf_end = lstart + lsize; 31962587Sitojun db_lc = lstart; 32062587Sitojun db_le = lstart; 32162587Sitojun 32262587Sitojun while (!db_inputchar(cngetc())) 32353541Sshin continue; 32453541Sshin 325171133Sgnn db_printf("\n"); /* synch output position */ 326171260Sdelphij *db_le = 0; 327171260Sdelphij 328171133Sgnn if (db_le - db_lbuf_start > 1) { 329171260Sdelphij /* Maintain input line history for non-empty lines. */ 330171133Sgnn if (++db_lhistidx == db_lhist_nlines) { 331171133Sgnn /* Rotate history. */ 332171133Sgnn ovbcopy(db_lhistory + db_lhistlsize, db_lhistory, 333171133Sgnn db_lhistlsize * (db_lhist_nlines - 1)); 33453541Sshin db_lhistidx--; 335122062Sume } 336171133Sgnn bcopy(lstart, db_lhistory + db_lhistidx * db_lhistlsize, 337126006Sume db_lhistlsize); 338126006Sume } 339126006Sume 340126006Sume return (db_le - db_lbuf_start); 341126006Sume} 342126006Sume 343126006Sumevoid 344126006Sumedb_check_interrupt() 345126006Sume{ 346122062Sume register int c; 347122062Sume 348122062Sume c = cnmaygetc(); 349122062Sume switch (c) { 350122062Sume case -1: /* no character */ 35153541Sshin return; 352122062Sume 353122062Sume case CTRL('c'): 354187949Sbz db_error((char *)0); 355122062Sume /*NOTREACHED*/ 356225044Sbz 357187989Sbz case CTRL('s'): 358187989Sbz do { 359187989Sbz c = cnmaygetc(); 360187989Sbz if (c == CTRL('c')) 361187989Sbz db_error((char *)0); 362225044Sbz } while (c != CTRL('q')); 363225044Sbz break; 364225044Sbz 365187989Sbz default: 366187989Sbz /* drop on floor */ 367187989Sbz break; 368187989Sbz } 369187989Sbz} 370187989Sbz