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("$FreeBSD$"); 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{ 1004Srgrimes register 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 1154Srgrimes/* 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'): 19890591Syar /* kill entire line: */ 19990591Syar /* at first, delete to beginning of line */ 20090591Syar if (db_lc > db_lbuf_start) 20190591Syar db_delete(db_lc - db_lbuf_start, DEL_BWD); 20290591Syar /* FALLTHROUGH */ 2034Srgrimes case CTRL('k'): 2044Srgrimes /* delete to end of line */ 2054Srgrimes if (db_lc < db_le) 2064Srgrimes db_delete(db_le - db_lc, DEL_FWD); 2074Srgrimes break; 2084Srgrimes case CTRL('t'): 2094Srgrimes /* twiddle last 2 characters */ 2104Srgrimes if (db_lc >= db_lbuf_start + 2) { 2114Srgrimes c = db_lc[-2]; 2124Srgrimes db_lc[-2] = db_lc[-1]; 2134Srgrimes db_lc[-1] = c; 2144Srgrimes cnputc(BACKUP); 2154Srgrimes cnputc(BACKUP); 2164Srgrimes cnputc(db_lc[-2]); 2174Srgrimes cnputc(db_lc[-1]); 2184Srgrimes } 2194Srgrimes break; 2204Srgrimes case CTRL('r'): 2214Srgrimes db_putstring("^R\n", 3); 22217495Sjoerg redraw: 2234Srgrimes if (db_le > db_lbuf_start) { 2244Srgrimes db_putstring(db_lbuf_start, db_le - db_lbuf_start); 2254Srgrimes db_putnchars(BACKUP, db_le - db_lc); 2264Srgrimes } 2274Srgrimes break; 22817495Sjoerg case CTRL('p'): 22917495Sjoerg /* Make previous history line the active one. */ 23017495Sjoerg if (db_lhistcur >= 0) { 23117495Sjoerg bcopy(db_lhistory + db_lhistcur * db_lhistlsize, 23217495Sjoerg db_lbuf_start, db_lhistlsize); 23317495Sjoerg db_lhistcur--; 23417495Sjoerg goto hist_redraw; 23517495Sjoerg } 23617495Sjoerg break; 23717495Sjoerg case CTRL('n'): 23817495Sjoerg /* Make next history line the active one. */ 23917495Sjoerg if (db_lhistcur < db_lhistidx - 1) { 24017495Sjoerg db_lhistcur += 2; 24117495Sjoerg bcopy(db_lhistory + db_lhistcur * db_lhistlsize, 24217495Sjoerg db_lbuf_start, db_lhistlsize); 24317495Sjoerg } else { 24417495Sjoerg /* 24517495Sjoerg * ^N through tail of history, reset the 24617495Sjoerg * buffer to zero length. 24717495Sjoerg */ 24817495Sjoerg *db_lbuf_start = '\0'; 24917495Sjoerg db_lhistcur = db_lhistidx; 25017495Sjoerg } 25117495Sjoerg 25217495Sjoerg hist_redraw: 253176870Srwatson db_putnchars(BACKUP, db_lc - db_lbuf_start); 25417495Sjoerg db_putnchars(BLANK, db_le - db_lbuf_start); 25517495Sjoerg db_putnchars(BACKUP, db_le - db_lbuf_start); 256229272Sed db_le = strchr(db_lbuf_start, '\0'); 25717495Sjoerg if (db_le[-1] == '\r' || db_le[-1] == '\n') 25817495Sjoerg *--db_le = '\0'; 25917495Sjoerg db_lc = db_le; 26017495Sjoerg goto redraw; 26117495Sjoerg 26219268Sjulian case -1: 26319268Sjulian /* 26419268Sjulian * eek! the console returned eof. 26519268Sjulian * probably that means we HAVE no console.. we should try bail 26619268Sjulian * XXX 26719268Sjulian */ 26819268Sjulian c = '\r'; 2694Srgrimes case '\n': 270115495Sphk /* FALLTHROUGH */ 2714Srgrimes case '\r': 2724Srgrimes *db_le++ = c; 2734Srgrimes return (1); 2744Srgrimes default: 2754Srgrimes if (db_le == db_lbuf_end) { 2764Srgrimes cnputc('\007'); 2774Srgrimes } 2784Srgrimes else if (c >= ' ' && c <= '~') { 2794Srgrimes register char *p; 2804Srgrimes 2814Srgrimes for (p = db_le; p > db_lc; p--) 2824Srgrimes *p = *(p-1); 2834Srgrimes *db_lc++ = c; 2844Srgrimes db_le++; 2854Srgrimes cnputc(c); 2864Srgrimes db_putstring(db_lc, db_le - db_lc); 2874Srgrimes db_putnchars(BACKUP, db_le - db_lc); 2884Srgrimes } 2894Srgrimes break; 2904Srgrimes } 2914Srgrimes return (0); 2924Srgrimes} 2934Srgrimes 294104094Sphkstatic int 29512473Sbdecnmaygetc() 2962112Swollman{ 2972112Swollman return (-1); 2982112Swollman} 2992112Swollman 3002112Swollmanint 3014Srgrimesdb_readline(lstart, lsize) 3024Srgrimes char * lstart; 3034Srgrimes int lsize; 3044Srgrimes{ 305176895Srwatson 306176895Srwatson if (lsize < 2) 307176895Srwatson return (0); 30831314Sbde if (lsize != db_lhistlsize) { 30931314Sbde /* 31031314Sbde * (Re)initialize input line history. Throw away any 31131314Sbde * existing history. 31231314Sbde */ 31331314Sbde db_lhist_nlines = sizeof(db_lhistory) / lsize; 31417495Sjoerg db_lhistlsize = lsize; 31517495Sjoerg db_lhistidx = -1; 31617495Sjoerg } 31717495Sjoerg db_lhistcur = db_lhistidx; 31817495Sjoerg 3194Srgrimes db_force_whitespace(); /* synch output position */ 3204Srgrimes 3214Srgrimes db_lbuf_start = lstart; 322176895Srwatson db_lbuf_end = lstart + lsize - 2; /* Will append NL and NUL. */ 3234Srgrimes db_lc = lstart; 3244Srgrimes db_le = lstart; 3254Srgrimes 3264Srgrimes while (!db_inputchar(cngetc())) 3274Srgrimes continue; 3284Srgrimes 329174910Srwatson db_capture_write(lstart, db_le - db_lbuf_start); 33015680Sgpalmer db_printf("\n"); /* synch output position */ 33117495Sjoerg *db_le = 0; 3324Srgrimes 33331314Sbde if (db_le - db_lbuf_start > 1) { 33417495Sjoerg /* Maintain input line history for non-empty lines. */ 33531062Smsmith if (++db_lhistidx == db_lhist_nlines) { 33617495Sjoerg /* Rotate history. */ 337113071Sdes bcopy(db_lhistory + db_lhistlsize, db_lhistory, 338113071Sdes db_lhistlsize * (db_lhist_nlines - 1)); 33917495Sjoerg db_lhistidx--; 34017495Sjoerg } 34131314Sbde bcopy(lstart, db_lhistory + db_lhistidx * db_lhistlsize, 34217495Sjoerg db_lhistlsize); 34317495Sjoerg } 34417495Sjoerg 3454Srgrimes return (db_le - db_lbuf_start); 3464Srgrimes} 3474Srgrimes 3484Srgrimesvoid 3494Srgrimesdb_check_interrupt() 3504Srgrimes{ 3514Srgrimes register int c; 3524Srgrimes 3534Srgrimes c = cnmaygetc(); 3544Srgrimes switch (c) { 3554Srgrimes case -1: /* no character */ 3564Srgrimes return; 3574Srgrimes 3584Srgrimes case CTRL('c'): 3594Srgrimes db_error((char *)0); 3604Srgrimes /*NOTREACHED*/ 3614Srgrimes 3624Srgrimes case CTRL('s'): 3634Srgrimes do { 3644Srgrimes c = cnmaygetc(); 3654Srgrimes if (c == CTRL('c')) 3664Srgrimes db_error((char *)0); 3674Srgrimes } while (c != CTRL('q')); 3684Srgrimes break; 3694Srgrimes 3704Srgrimes default: 3714Srgrimes /* drop on floor */ 3724Srgrimes break; 3734Srgrimes } 3744Srgrimes} 375