1139747Simp/*- 24Srgrimes * Mach Operating System 34Srgrimes * Copyright (c) 1991,1990 Carnegie Mellon University 44Srgrimes * All Rights Reserved. 58876Srgrimes * 64Srgrimes * Permission to use, copy, modify and distribute this software and its 74Srgrimes * documentation is hereby granted, provided that both the copyright 84Srgrimes * notice and this permission notice appear in all copies of the 94Srgrimes * software, derivative works or modified versions, and any portions 104Srgrimes * thereof, and that both notices appear in supporting documentation. 118876Srgrimes * 128876Srgrimes * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 134Srgrimes * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 144Srgrimes * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 158876Srgrimes * 164Srgrimes * Carnegie Mellon requests users of this software to return to 178876Srgrimes * 184Srgrimes * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 194Srgrimes * School of Computer Science 204Srgrimes * Carnegie Mellon University 214Srgrimes * Pittsburgh PA 15213-3890 228876Srgrimes * 234Srgrimes * any improvements or extensions that they make and grant Carnegie the 244Srgrimes * rights to redistribute these changes. 254Srgrimes */ 264Srgrimes/* 274Srgrimes * Author: David B. Golub, Carnegie Mellon University 284Srgrimes * Date: 7/90 294Srgrimes */ 304Srgrimes 31116176Sobrien#include <sys/cdefs.h> 32116176Sobrien__FBSDID("$FreeBSD: stable/11/sys/ddb/db_input.c 324266 2017-10-04 11:54:15Z trasz $"); 33116176Sobrien 342056Swollman#include <sys/param.h> 352056Swollman#include <sys/systm.h> 3649558Sphk#include <sys/cons.h> 3712734Sbde 382056Swollman#include <ddb/ddb.h> 392056Swollman#include <ddb/db_output.h> 404Srgrimes 414Srgrimes/* 424Srgrimes * Character input and editing. 434Srgrimes */ 444Srgrimes 454Srgrimes/* 464Srgrimes * We don't track output position while editing input, 474Srgrimes * since input always ends with a new-line. We just 484Srgrimes * reset the line position at the end. 494Srgrimes */ 5012720Sphkstatic char * db_lbuf_start; /* start of input line buffer */ 5112720Sphkstatic char * db_lbuf_end; /* end of input line buffer */ 5212720Sphkstatic char * db_lc; /* current character */ 5312720Sphkstatic char * db_le; /* one past last character */ 544Srgrimes 5517495Sjoerg/* 5617495Sjoerg * Simple input line history support. 5717495Sjoerg */ 5831314Sbdestatic char db_lhistory[2048]; 5917495Sjoergstatic int db_lhistlsize, db_lhistidx, db_lhistcur; 6031062Smsmithstatic int db_lhist_nlines; 6117495Sjoerg 624Srgrimes#define CTRL(c) ((c) & 0x1f) 634Srgrimes#define BLANK ' ' 644Srgrimes#define BACKUP '\b' 654Srgrimes 6692756Salfredstatic int cnmaygetc(void); 6792756Salfredstatic void db_delete(int n, int bwd); 6892756Salfredstatic int db_inputchar(int c); 6992756Salfredstatic void db_putnchars(int c, int count); 7092756Salfredstatic void db_putstring(char *s, int count); 7112473Sbde 72104094Sphkstatic void 734Srgrimesdb_putstring(s, count) 744Srgrimes char *s; 754Srgrimes int count; 764Srgrimes{ 774Srgrimes while (--count >= 0) 784Srgrimes cnputc(*s++); 794Srgrimes} 804Srgrimes 81104094Sphkstatic void 824Srgrimesdb_putnchars(c, count) 834Srgrimes int c; 844Srgrimes int count; 854Srgrimes{ 864Srgrimes while (--count >= 0) 874Srgrimes cnputc(c); 884Srgrimes} 894Srgrimes 904Srgrimes/* 914Srgrimes * Delete N characters, forward or backward 924Srgrimes */ 934Srgrimes#define DEL_FWD 0 944Srgrimes#define DEL_BWD 1 95104094Sphkstatic void 964Srgrimesdb_delete(n, bwd) 974Srgrimes int n; 984Srgrimes int bwd; 994Srgrimes{ 100283315Spfg char *p; 1014Srgrimes 1024Srgrimes if (bwd) { 1034Srgrimes db_lc -= n; 1044Srgrimes db_putnchars(BACKUP, n); 1054Srgrimes } 1064Srgrimes for (p = db_lc; p < db_le-n; p++) { 1074Srgrimes *p = *(p+n); 1084Srgrimes cnputc(*p); 1094Srgrimes } 1104Srgrimes db_putnchars(BLANK, n); 1114Srgrimes db_putnchars(BACKUP, db_le - db_lc); 1124Srgrimes db_le -= n; 1134Srgrimes} 1144Srgrimes 115283088Spfg/* returns true at end-of-line */ 116104094Sphkstatic int 1174Srgrimesdb_inputchar(c) 1184Srgrimes int c; 1194Srgrimes{ 12024840Sjoerg static int escstate; 12124840Sjoerg 12224840Sjoerg if (escstate == 1) { 12324840Sjoerg /* ESC seen, look for [ or O */ 12424840Sjoerg if (c == '[' || c == 'O') 12524840Sjoerg escstate++; 12624840Sjoerg else 12724840Sjoerg escstate = 0; /* re-init state machine */ 12824840Sjoerg return (0); 12924840Sjoerg } else if (escstate == 2) { 13024840Sjoerg escstate = 0; 13124840Sjoerg /* 13224840Sjoerg * If a valid cursor key has been found, translate 13324840Sjoerg * into an emacs-style control key, and fall through. 13424840Sjoerg * Otherwise, drop off. 13524840Sjoerg */ 13624840Sjoerg switch (c) { 13724840Sjoerg case 'A': /* up */ 13824840Sjoerg c = CTRL('p'); 13924840Sjoerg break; 14024840Sjoerg case 'B': /* down */ 14124840Sjoerg c = CTRL('n'); 14224840Sjoerg break; 14324840Sjoerg case 'C': /* right */ 14424840Sjoerg c = CTRL('f'); 14524840Sjoerg break; 14624840Sjoerg case 'D': /* left */ 14724840Sjoerg c = CTRL('b'); 14824840Sjoerg break; 14924840Sjoerg default: 15024840Sjoerg return (0); 15124840Sjoerg } 15224840Sjoerg } 15324840Sjoerg 1544Srgrimes switch (c) { 15524840Sjoerg case CTRL('['): 15624840Sjoerg escstate = 1; 15724840Sjoerg break; 1584Srgrimes case CTRL('b'): 1594Srgrimes /* back up one character */ 1604Srgrimes if (db_lc > db_lbuf_start) { 1614Srgrimes cnputc(BACKUP); 1624Srgrimes db_lc--; 1634Srgrimes } 1644Srgrimes break; 1654Srgrimes case CTRL('f'): 1664Srgrimes /* forward one character */ 1674Srgrimes if (db_lc < db_le) { 1684Srgrimes cnputc(*db_lc); 1694Srgrimes db_lc++; 1704Srgrimes } 1714Srgrimes break; 1724Srgrimes case CTRL('a'): 1734Srgrimes /* beginning of line */ 1744Srgrimes while (db_lc > db_lbuf_start) { 1754Srgrimes cnputc(BACKUP); 1764Srgrimes db_lc--; 1774Srgrimes } 1784Srgrimes break; 1794Srgrimes case CTRL('e'): 1804Srgrimes /* end of line */ 1814Srgrimes while (db_lc < db_le) { 1824Srgrimes cnputc(*db_lc); 1834Srgrimes db_lc++; 1844Srgrimes } 1854Srgrimes break; 1864Srgrimes case CTRL('h'): 1874Srgrimes case 0177: 1884Srgrimes /* erase previous character */ 1894Srgrimes if (db_lc > db_lbuf_start) 1904Srgrimes db_delete(1, DEL_BWD); 1914Srgrimes break; 1924Srgrimes case CTRL('d'): 1934Srgrimes /* erase next character */ 1944Srgrimes if (db_lc < db_le) 1954Srgrimes db_delete(1, DEL_FWD); 1964Srgrimes break; 19790591Syar case CTRL('u'): 198324264Strasz case CTRL('c'): 19990591Syar /* kill entire line: */ 20090591Syar /* at first, delete to beginning of line */ 20190591Syar if (db_lc > db_lbuf_start) 20290591Syar db_delete(db_lc - db_lbuf_start, DEL_BWD); 20390591Syar /* FALLTHROUGH */ 2044Srgrimes case CTRL('k'): 2054Srgrimes /* delete to end of line */ 2064Srgrimes if (db_lc < db_le) 2074Srgrimes db_delete(db_le - db_lc, DEL_FWD); 2084Srgrimes break; 2094Srgrimes case CTRL('t'): 2104Srgrimes /* twiddle last 2 characters */ 2114Srgrimes if (db_lc >= db_lbuf_start + 2) { 2124Srgrimes c = db_lc[-2]; 2134Srgrimes db_lc[-2] = db_lc[-1]; 2144Srgrimes db_lc[-1] = c; 2154Srgrimes cnputc(BACKUP); 2164Srgrimes cnputc(BACKUP); 2174Srgrimes cnputc(db_lc[-2]); 2184Srgrimes cnputc(db_lc[-1]); 2194Srgrimes } 2204Srgrimes break; 221324266Strasz case CTRL('w'): 222324266Strasz /* erase previous word */ 223324266Strasz for (; db_lc > db_lbuf_start;) { 224324266Strasz if (*(db_lc - 1) != ' ') 225324266Strasz break; 226324266Strasz db_delete(1, DEL_BWD); 227324266Strasz } 228324266Strasz for (; db_lc > db_lbuf_start;) { 229324266Strasz if (*(db_lc - 1) == ' ') 230324266Strasz break; 231324266Strasz db_delete(1, DEL_BWD); 232324266Strasz } 233324266Strasz break; 2344Srgrimes case CTRL('r'): 2354Srgrimes db_putstring("^R\n", 3); 23617495Sjoerg redraw: 2374Srgrimes if (db_le > db_lbuf_start) { 2384Srgrimes db_putstring(db_lbuf_start, db_le - db_lbuf_start); 2394Srgrimes db_putnchars(BACKUP, db_le - db_lc); 2404Srgrimes } 2414Srgrimes break; 24217495Sjoerg case CTRL('p'): 24317495Sjoerg /* Make previous history line the active one. */ 24417495Sjoerg if (db_lhistcur >= 0) { 24517495Sjoerg bcopy(db_lhistory + db_lhistcur * db_lhistlsize, 24617495Sjoerg db_lbuf_start, db_lhistlsize); 24717495Sjoerg db_lhistcur--; 24817495Sjoerg goto hist_redraw; 24917495Sjoerg } 25017495Sjoerg break; 25117495Sjoerg case CTRL('n'): 25217495Sjoerg /* Make next history line the active one. */ 25317495Sjoerg if (db_lhistcur < db_lhistidx - 1) { 25417495Sjoerg db_lhistcur += 2; 25517495Sjoerg bcopy(db_lhistory + db_lhistcur * db_lhistlsize, 25617495Sjoerg db_lbuf_start, db_lhistlsize); 25717495Sjoerg } else { 25817495Sjoerg /* 25917495Sjoerg * ^N through tail of history, reset the 26017495Sjoerg * buffer to zero length. 26117495Sjoerg */ 26217495Sjoerg *db_lbuf_start = '\0'; 26317495Sjoerg db_lhistcur = db_lhistidx; 26417495Sjoerg } 26517495Sjoerg 26617495Sjoerg hist_redraw: 267176870Srwatson db_putnchars(BACKUP, db_lc - db_lbuf_start); 26817495Sjoerg db_putnchars(BLANK, db_le - db_lbuf_start); 26917495Sjoerg db_putnchars(BACKUP, db_le - db_lbuf_start); 270229272Sed db_le = strchr(db_lbuf_start, '\0'); 27117495Sjoerg if (db_le[-1] == '\r' || db_le[-1] == '\n') 27217495Sjoerg *--db_le = '\0'; 27317495Sjoerg db_lc = db_le; 27417495Sjoerg goto redraw; 27517495Sjoerg 27619268Sjulian case -1: 27719268Sjulian /* 27819268Sjulian * eek! the console returned eof. 27919268Sjulian * probably that means we HAVE no console.. we should try bail 28019268Sjulian * XXX 28119268Sjulian */ 28219268Sjulian c = '\r'; 2834Srgrimes case '\n': 284115495Sphk /* FALLTHROUGH */ 2854Srgrimes case '\r': 2864Srgrimes *db_le++ = c; 2874Srgrimes return (1); 2884Srgrimes default: 2894Srgrimes if (db_le == db_lbuf_end) { 2904Srgrimes cnputc('\007'); 2914Srgrimes } 2924Srgrimes else if (c >= ' ' && c <= '~') { 293283315Spfg char *p; 2944Srgrimes 2954Srgrimes for (p = db_le; p > db_lc; p--) 2964Srgrimes *p = *(p-1); 2974Srgrimes *db_lc++ = c; 2984Srgrimes db_le++; 2994Srgrimes cnputc(c); 3004Srgrimes db_putstring(db_lc, db_le - db_lc); 3014Srgrimes db_putnchars(BACKUP, db_le - db_lc); 3024Srgrimes } 3034Srgrimes break; 3044Srgrimes } 3054Srgrimes return (0); 3064Srgrimes} 3074Srgrimes 308104094Sphkstatic int 30912473Sbdecnmaygetc() 3102112Swollman{ 3112112Swollman return (-1); 3122112Swollman} 3132112Swollman 3142112Swollmanint 3154Srgrimesdb_readline(lstart, lsize) 3164Srgrimes char * lstart; 3174Srgrimes int lsize; 3184Srgrimes{ 319176895Srwatson 320176895Srwatson if (lsize < 2) 321176895Srwatson return (0); 32231314Sbde if (lsize != db_lhistlsize) { 32331314Sbde /* 32431314Sbde * (Re)initialize input line history. Throw away any 32531314Sbde * existing history. 32631314Sbde */ 32731314Sbde db_lhist_nlines = sizeof(db_lhistory) / lsize; 32817495Sjoerg db_lhistlsize = lsize; 32917495Sjoerg db_lhistidx = -1; 33017495Sjoerg } 33117495Sjoerg db_lhistcur = db_lhistidx; 33217495Sjoerg 3334Srgrimes db_force_whitespace(); /* synch output position */ 3344Srgrimes 3354Srgrimes db_lbuf_start = lstart; 336176895Srwatson db_lbuf_end = lstart + lsize - 2; /* Will append NL and NUL. */ 3374Srgrimes db_lc = lstart; 3384Srgrimes db_le = lstart; 3394Srgrimes 3404Srgrimes while (!db_inputchar(cngetc())) 3414Srgrimes continue; 3424Srgrimes 343174910Srwatson db_capture_write(lstart, db_le - db_lbuf_start); 34415680Sgpalmer db_printf("\n"); /* synch output position */ 34517495Sjoerg *db_le = 0; 3464Srgrimes 34731314Sbde if (db_le - db_lbuf_start > 1) { 34817495Sjoerg /* Maintain input line history for non-empty lines. */ 34931062Smsmith if (++db_lhistidx == db_lhist_nlines) { 35017495Sjoerg /* Rotate history. */ 351113071Sdes bcopy(db_lhistory + db_lhistlsize, db_lhistory, 352113071Sdes db_lhistlsize * (db_lhist_nlines - 1)); 35317495Sjoerg db_lhistidx--; 35417495Sjoerg } 35531314Sbde bcopy(lstart, db_lhistory + db_lhistidx * db_lhistlsize, 35617495Sjoerg db_lhistlsize); 35717495Sjoerg } 35817495Sjoerg 3594Srgrimes return (db_le - db_lbuf_start); 3604Srgrimes} 3614Srgrimes 3624Srgrimesvoid 363273006Spfgdb_check_interrupt(void) 3644Srgrimes{ 365283315Spfg int c; 3664Srgrimes 3674Srgrimes c = cnmaygetc(); 3684Srgrimes switch (c) { 3694Srgrimes case -1: /* no character */ 3704Srgrimes return; 3714Srgrimes 3724Srgrimes case CTRL('c'): 3734Srgrimes db_error((char *)0); 3744Srgrimes /*NOTREACHED*/ 3754Srgrimes 3764Srgrimes case CTRL('s'): 3774Srgrimes do { 3784Srgrimes c = cnmaygetc(); 3794Srgrimes if (c == CTRL('c')) 3804Srgrimes db_error((char *)0); 3814Srgrimes } while (c != CTRL('q')); 3824Srgrimes break; 3834Srgrimes 3844Srgrimes default: 3854Srgrimes /* drop on floor */ 3864Srgrimes break; 3874Srgrimes } 3884Srgrimes} 389