diff options
Diffstat (limited to 'contrib/nvi/vi/vi.c')
| -rw-r--r-- | contrib/nvi/vi/vi.c | 1251 |
1 files changed, 1251 insertions, 0 deletions
diff --git a/contrib/nvi/vi/vi.c b/contrib/nvi/vi/vi.c new file mode 100644 index 0000000..d20f7f2 --- /dev/null +++ b/contrib/nvi/vi/vi.c @@ -0,0 +1,1251 @@ +/*- + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1992, 1993, 1994, 1995, 1996 + * Keith Bostic. All rights reserved. + * + * See the LICENSE file for redistribution information. + */ + +#include "config.h" + +#ifndef lint +static const char sccsid[] = "@(#)vi.c 10.57 (Berkeley) 10/13/96"; +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/queue.h> +#include <sys/time.h> + +#include <bitstring.h> +#include <ctype.h> +#include <errno.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "../common/common.h" +#include "vi.h" + +typedef enum { + GC_ERR, GC_ERR_NOFLUSH, GC_EVENT, GC_FATAL, GC_INTERRUPT, GC_OK +} gcret_t; + +static VIKEYS const + *v_alias __P((SCR *, VICMD *, VIKEYS const *)); +static gcret_t v_cmd __P((SCR *, VICMD *, VICMD *, VICMD *, int *, int *)); +static int v_count __P((SCR *, ARG_CHAR_T, u_long *)); +static void v_dtoh __P((SCR *)); +static int v_init __P((SCR *)); +static gcret_t v_key __P((SCR *, int, EVENT *, u_int32_t)); +static int v_keyword __P((SCR *)); +static int v_motion __P((SCR *, VICMD *, VICMD *, int *)); + +#if defined(DEBUG) && defined(COMLOG) +static void v_comlog __P((SCR *, VICMD *)); +#endif + +/* + * Side-effect: + * The dot structure can be set by the underlying vi functions, + * see v_Put() and v_put(). + */ +#define DOT (&VIP(sp)->sdot) +#define DOTMOTION (&VIP(sp)->sdotmotion) + +/* + * vi -- + * Main vi command loop. + * + * PUBLIC: int vi __P((SCR **)); + */ +int +vi(spp) + SCR **spp; +{ + GS *gp; + MARK abs; + SCR *next, *sp; + VICMD cmd, *vp; + VI_PRIVATE *vip; + int comcount, mapped, rval; + + /* Get the first screen. */ + sp = *spp; + gp = sp->gp; + + /* Initialize the command structure. */ + vp = &cmd; + memset(vp, 0, sizeof(VICMD)); + + /* Reset strange attraction. */ + F_SET(vp, VM_RCM_SET); + + /* Initialize the vi screen. */ + if (v_init(sp)) + return (1); + + /* Set the focus. */ + (void)sp->gp->scr_rename(sp, sp->frp->name, 1); + + for (vip = VIP(sp), rval = 0;;) { + /* Resolve messages. */ + if (!MAPPED_KEYS_WAITING(sp) && vs_resolve(sp, NULL, 0)) + goto ret; + + /* + * If not skipping a refresh, return to command mode and + * refresh the screen. + */ + if (F_ISSET(vip, VIP_S_REFRESH)) + F_CLR(vip, VIP_S_REFRESH); + else { + sp->showmode = SM_COMMAND; + if (vs_refresh(sp, 0)) + goto ret; + } + + /* Set the new favorite position. */ + if (F_ISSET(vp, VM_RCM_SET | VM_RCM_SETFNB | VM_RCM_SETNNB)) { + F_CLR(vip, VIP_RCM_LAST); + (void)vs_column(sp, &sp->rcm); + } + + /* + * If not currently in a map, log the cursor position, + * and set a flag so that this command can become the + * DOT command. + */ + if (MAPPED_KEYS_WAITING(sp)) + mapped = 1; + else { + if (log_cursor(sp)) + goto err; + mapped = 0; + } + + /* + * There may be an ex command waiting, and we returned here + * only because we exited a screen or file. In this case, + * we simply go back into the ex parser. + */ + if (EXCMD_RUNNING(gp)) { + vp->kp = &vikeys[':']; + goto ex_continue; + } + + /* Refresh the command structure. */ + memset(vp, 0, sizeof(VICMD)); + + /* + * We get a command, which may or may not have an associated + * motion. If it does, we get it too, calling its underlying + * function to get the resulting mark. We then call the + * command setting the cursor to the resulting mark. + * + * !!! + * Vi historically flushed mapped characters on error, but + * entering extra <escape> characters at the beginning of + * a map wasn't considered an error -- in fact, users would + * put leading <escape> characters in maps to clean up vi + * state before the map was interpreted. Beauty! + */ + switch (v_cmd(sp, DOT, vp, NULL, &comcount, &mapped)) { + case GC_ERR: + goto err; + case GC_ERR_NOFLUSH: + goto gc_err_noflush; + case GC_EVENT: + if (v_event_exec(sp, vp)) + goto err; + goto gc_event; + case GC_FATAL: + goto ret; + case GC_INTERRUPT: + goto intr; + case GC_OK: + break; + } + + /* Check for security setting. */ + if (F_ISSET(vp->kp, V_SECURE) && O_ISSET(sp, O_SECURE)) { + ex_emsg(sp, KEY_NAME(sp, vp->key), EXM_SECURE); + goto err; + } + + /* + * Historical practice: if a dot command gets a new count, + * any motion component goes away, i.e. "d3w2." deletes a + * total of 5 words. + */ + if (F_ISSET(vp, VC_ISDOT) && comcount) + DOTMOTION->count = 1; + + /* Copy the key flags into the local structure. */ + F_SET(vp, vp->kp->flags); + + /* Prepare to set the previous context. */ + if (F_ISSET(vp, V_ABS | V_ABS_C | V_ABS_L)) { + abs.lno = sp->lno; + abs.cno = sp->cno; + } + + /* + * Set the three cursor locations to the current cursor. The + * underlying routines don't bother if the cursor doesn't move. + * This also handles line commands (e.g. Y) defaulting to the + * current line. + */ + vp->m_start.lno = vp->m_stop.lno = vp->m_final.lno = sp->lno; + vp->m_start.cno = vp->m_stop.cno = vp->m_final.cno = sp->cno; + + /* + * Do any required motion; v_motion sets the from MARK and the + * line mode flag, as well as the VM_RCM flags. + */ + if (F_ISSET(vp, V_MOTION) && + v_motion(sp, DOTMOTION, vp, &mapped)) { + if (INTERRUPTED(sp)) + goto intr; + goto err; + } + + /* + * If a count is set and the command is line oriented, set the + * to MARK here relative to the cursor/from MARK. This is for + * commands that take both counts and motions, i.e. "4yy" and + * "y%". As there's no way the command can know which the user + * did, we have to do it here. (There are commands that are + * line oriented and that take counts ("#G", "#H"), for which + * this calculation is either completely meaningless or wrong. + * Each command must validate the value for itself. + */ + if (F_ISSET(vp, VC_C1SET) && F_ISSET(vp, VM_LMODE)) + vp->m_stop.lno += vp->count - 1; + + /* Increment the command count. */ + ++sp->ccnt; + +#if defined(DEBUG) && defined(COMLOG) + v_comlog(sp, vp); +#endif + /* Call the function. */ +ex_continue: if (vp->kp->func(sp, vp)) + goto err; +gc_event: +#ifdef DEBUG + /* Make sure no function left the temporary space locked. */ + if (F_ISSET(gp, G_TMP_INUSE)) { + F_CLR(gp, G_TMP_INUSE); + msgq(sp, M_ERR, + "232|vi: temporary buffer not released"); + } +#endif + /* + * If we're exiting this screen, move to the next one, or, if + * there aren't any more, return to the main editor loop. The + * ordering is careful, don't discard the contents of sp until + * the end. + */ + if (F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE)) { + if (file_end(sp, NULL, F_ISSET(sp, SC_EXIT_FORCE))) + goto ret; + if (vs_discard(sp, &next)) + goto ret; + if (next == NULL && vs_swap(sp, &next, NULL)) + goto ret; + *spp = next; + if (screen_end(sp)) + goto ret; + if (next == NULL) + break; + + /* Switch screens, change focus. */ + sp = next; + vip = VIP(sp); + (void)sp->gp->scr_rename(sp, sp->frp->name, 1); + + /* Don't trust the cursor. */ + F_SET(vip, VIP_CUR_INVALID); + + continue; + } + + /* + * Set the dot command structure. + * + * !!! + * Historically, commands which used mapped keys did not + * set the dot command, with the exception of the text + * input commands. + */ + if (F_ISSET(vp, V_DOT) && !mapped) { + *DOT = cmd; + F_SET(DOT, VC_ISDOT); + + /* + * If a count was supplied for both the command and + * its motion, the count was used only for the motion. + * Turn the count back on for the dot structure. + */ + if (F_ISSET(vp, VC_C1RESET)) + F_SET(DOT, VC_C1SET); + + /* VM flags aren't retained. */ + F_CLR(DOT, VM_COMMASK | VM_RCM_MASK); + } + + /* + * Some vi row movements are "attracted" to the last position + * set, i.e. the VM_RCM commands are moths to the VM_RCM_SET + * commands' candle. If the movement is to the EOL the vi + * command handles it. If it's to the beginning, we handle it + * here. + * + * Note, some commands (e.g. _, ^) don't set the VM_RCM_SETFNB + * flag, but do the work themselves. The reason is that they + * have to modify the column in case they're being used as a + * motion component. Other similar commands (e.g. +, -) don't + * have to modify the column because they are always line mode + * operations when used as motions, so the column number isn't + * of any interest. + * + * Does this totally violate the screen and editor layering? + * You betcha. As they say, if you think you understand it, + * you don't. + */ + switch (F_ISSET(vp, VM_RCM_MASK)) { + case 0: + case VM_RCM_SET: + break; + case VM_RCM: + vp->m_final.cno = vs_rcm(sp, + vp->m_final.lno, F_ISSET(vip, VIP_RCM_LAST)); + break; + case VM_RCM_SETLAST: + F_SET(vip, VIP_RCM_LAST); + break; + case VM_RCM_SETFNB: + vp->m_final.cno = 0; + /* FALLTHROUGH */ + case VM_RCM_SETNNB: + if (nonblank(sp, vp->m_final.lno, &vp->m_final.cno)) + goto err; + break; + default: + abort(); + } + + /* Update the cursor. */ + sp->lno = vp->m_final.lno; + sp->cno = vp->m_final.cno; + + /* + * Set the absolute mark -- set even if a tags or similar + * command, since the tag may be moving to the same file. + */ + if ((F_ISSET(vp, V_ABS) || + F_ISSET(vp, V_ABS_L) && sp->lno != abs.lno || + F_ISSET(vp, V_ABS_C) && + (sp->lno != abs.lno || sp->cno != abs.cno)) && + mark_set(sp, ABSMARK1, &abs, 1)) + goto err; + + if (0) { +err: if (v_event_flush(sp, CH_MAPPED)) + msgq(sp, M_BERR, + "110|Vi command failed: mapped keys discarded"); + } + + /* + * Check and clear interrupts. There's an obvious race, but + * it's not worth fixing. + */ +gc_err_noflush: if (INTERRUPTED(sp)) { +intr: CLR_INTERRUPT(sp); + if (v_event_flush(sp, CH_MAPPED)) + msgq(sp, M_ERR, + "231|Interrupted: mapped keys discarded"); + else + msgq(sp, M_ERR, "236|Interrupted"); + } + + /* If the last command switched screens, update. */ + if (F_ISSET(sp, SC_SSWITCH)) { + F_CLR(sp, SC_SSWITCH); + + /* + * If the current screen is still displayed, it will + * need a new status line. + */ + F_SET(sp, SC_STATUS); + + /* Switch screens, change focus. */ + sp = sp->nextdisp; + vip = VIP(sp); + (void)sp->gp->scr_rename(sp, sp->frp->name, 1); + + /* Don't trust the cursor. */ + F_SET(vip, VIP_CUR_INVALID); + + /* Refresh so we can display messages. */ + if (vs_refresh(sp, 1)) + return (1); + } + + /* If the last command switched files, change focus. */ + if (F_ISSET(sp, SC_FSWITCH)) { + F_CLR(sp, SC_FSWITCH); + (void)sp->gp->scr_rename(sp, sp->frp->name, 1); + } + + /* If leaving vi, return to the main editor loop. */ + if (F_ISSET(gp, G_SRESTART) || F_ISSET(sp, SC_EX)) { + *spp = sp; + v_dtoh(sp); + break; + } + } + if (0) +ret: rval = 1; + return (rval); +} + +#define KEY(key, ec_flags) { \ + if ((gcret = v_key(sp, 0, &ev, ec_flags)) != GC_OK) \ + return (gcret); \ + if (ev.e_value == K_ESCAPE) \ + goto esc; \ + if (F_ISSET(&ev.e_ch, CH_MAPPED)) \ + *mappedp = 1; \ + key = ev.e_c; \ +} + +/* + * The O_TILDEOP option makes the ~ command take a motion instead + * of a straight count. This is the replacement structure we use + * instead of the one currently in the VIKEYS table. + * + * XXX + * This should probably be deleted -- it's not all that useful, and + * we get help messages wrong. + */ +VIKEYS const tmotion = { + v_mulcase, V_CNT|V_DOT|V_MOTION|VM_RCM_SET, + "[count]~[count]motion", + " ~ change case to motion" +}; + +/* + * v_cmd -- + * + * The command structure for vi is less complex than ex (and don't think + * I'm not grateful!) The command syntax is: + * + * [count] [buffer] [count] key [[motion] | [buffer] [character]] + * + * and there are several special cases. The motion value is itself a vi + * command, with the syntax: + * + * [count] key [character] + */ +static gcret_t +v_cmd(sp, dp, vp, ismotion, comcountp, mappedp) + SCR *sp; + VICMD *dp, *vp; + VICMD *ismotion; /* Previous key if getting motion component. */ + int *comcountp, *mappedp; +{ + enum { COMMANDMODE, ISPARTIAL, NOTPARTIAL } cpart; + EVENT ev; + VIKEYS const *kp; + gcret_t gcret; + u_int flags; + CHAR_T key; + char *s; + + /* + * Get a key. + * + * <escape> cancels partial commands, i.e. a command where at least + * one non-numeric character has been entered. Otherwise, it beeps + * the terminal. + * + * !!! + * POSIX 1003.2-1992 explicitly disallows cancelling commands where + * all that's been entered is a number, requiring that the terminal + * be alerted. + */ + cpart = ismotion == NULL ? COMMANDMODE : ISPARTIAL; + if ((gcret = + v_key(sp, ismotion == NULL, &ev, EC_MAPCOMMAND)) != GC_OK) { + if (gcret == GC_EVENT) + vp->ev = ev; + return (gcret); + } + if (ev.e_value == K_ESCAPE) + goto esc; + if (F_ISSET(&ev.e_ch, CH_MAPPED)) + *mappedp = 1; + key = ev.e_c; + + if (ismotion == NULL) + cpart = NOTPARTIAL; + + /* Pick up optional buffer. */ + if (key == '"') { + cpart = ISPARTIAL; + if (ismotion != NULL) { + v_emsg(sp, NULL, VIM_COMBUF); + return (GC_ERR); + } + KEY(vp->buffer, 0); + F_SET(vp, VC_BUFFER); + + KEY(key, EC_MAPCOMMAND); + } + + /* + * Pick up optional count, where a leading 0 is not a count, + * it's a command. + */ + if (isdigit(key) && key != '0') { + if (v_count(sp, key, &vp->count)) + return (GC_ERR); + F_SET(vp, VC_C1SET); + *comcountp = 1; + + KEY(key, EC_MAPCOMMAND); + } else + *comcountp = 0; + + /* Pick up optional buffer. */ + if (key == '"') { + cpart = ISPARTIAL; + if (F_ISSET(vp, VC_BUFFER)) { + msgq(sp, M_ERR, "234|Only one buffer may be specified"); + return (GC_ERR); + } + if (ismotion != NULL) { + v_emsg(sp, NULL, VIM_COMBUF); + return (GC_ERR); + } + KEY(vp->buffer, 0); + F_SET(vp, VC_BUFFER); + + KEY(key, EC_MAPCOMMAND); + } + + /* Check for an OOB command key. */ + cpart = ISPARTIAL; + if (key > MAXVIKEY) { + v_emsg(sp, KEY_NAME(sp, key), VIM_NOCOM); + return (GC_ERR); + } + kp = &vikeys[vp->key = key]; + + /* + * !!! + * Historically, D accepted and then ignored a count. Match it. + */ + if (vp->key == 'D' && F_ISSET(vp, VC_C1SET)) { + *comcountp = 0; + vp->count = 0; + F_CLR(vp, VC_C1SET); + } + + /* Check for command aliases. */ + if (kp->func == NULL && (kp = v_alias(sp, vp, kp)) == NULL) + return (GC_ERR); + + /* The tildeop option makes the ~ command take a motion. */ + if (key == '~' && O_ISSET(sp, O_TILDEOP)) + kp = &tmotion; + + vp->kp = kp; + + /* + * Find the command. The only legal command with no underlying + * function is dot. It's historic practice that <escape> doesn't + * just erase the preceding number, it beeps the terminal as well. + * It's a common problem, so just beep the terminal unless verbose + * was set. + */ + if (kp->func == NULL) { + if (key != '.') { + v_emsg(sp, KEY_NAME(sp, key), + ev.e_value == K_ESCAPE ? VIM_NOCOM_B : VIM_NOCOM); + return (GC_ERR); + } + + /* If called for a motion command, stop now. */ + if (dp == NULL) + goto usage; + + /* + * !!! + * If a '.' is immediately entered after an undo command, we + * replay the log instead of redoing the last command. This + * is necessary because 'u' can't set the dot command -- see + * vi/v_undo.c:v_undo for details. + */ + if (VIP(sp)->u_ccnt == sp->ccnt) { + vp->kp = &vikeys['u']; + F_SET(vp, VC_ISDOT); + return (GC_OK); + } + + /* Otherwise, a repeatable command must have been executed. */ + if (!F_ISSET(dp, VC_ISDOT)) { + msgq(sp, M_ERR, "208|No command to repeat"); + return (GC_ERR); + } + + /* Set new count/buffer, if any, and return. */ + if (F_ISSET(vp, VC_C1SET)) { + F_SET(dp, VC_C1SET); + dp->count = vp->count; + } + if (F_ISSET(vp, VC_BUFFER)) + dp->buffer = vp->buffer; + + *vp = *dp; + return (GC_OK); + } + + /* Set the flags based on the command flags. */ + flags = kp->flags; + + /* Check for illegal count. */ + if (F_ISSET(vp, VC_C1SET) && !LF_ISSET(V_CNT)) + goto usage; + + /* Illegal motion command. */ + if (ismotion == NULL) { + /* Illegal buffer. */ + if (!LF_ISSET(V_OBUF) && F_ISSET(vp, VC_BUFFER)) + goto usage; + + /* Required buffer. */ + if (LF_ISSET(V_RBUF)) { + KEY(vp->buffer, 0); + F_SET(vp, VC_BUFFER); + } + } + + /* + * Special case: '[', ']' and 'Z' commands. Doesn't the fact that + * the *single* characters don't mean anything but the *doubled* + * characters do, just frost your shorts? + */ + if (vp->key == '[' || vp->key == ']' || vp->key == 'Z') { + /* + * Historically, half entered [[, ]] or Z commands weren't + * cancelled by <escape>, the terminal was beeped instead. + * POSIX.2-1992 probably didn't notice, and requires that + * they be cancelled instead of beeping. Seems fine to me. + * + * Don't set the EC_MAPCOMMAND flag, apparently ] is a popular + * vi meta-character, and we don't want the user to wait while + * we time out a possible mapping. This *appears* to match + * historic vi practice, but with mapping characters, you Just + * Never Know. + */ + KEY(key, 0); + + if (vp->key != key) { +usage: if (ismotion == NULL) + s = kp->usage; + else if (ismotion->key == '~' && O_ISSET(sp, O_TILDEOP)) + s = tmotion.usage; + else + s = vikeys[ismotion->key].usage; + v_emsg(sp, s, VIM_USAGE); + return (GC_ERR); + } + } + /* Special case: 'z' command. */ + if (vp->key == 'z') { + KEY(vp->character, 0); + if (isdigit(vp->character)) { + if (v_count(sp, vp->character, &vp->count2)) + return (GC_ERR); + F_SET(vp, VC_C2SET); + KEY(vp->character, 0); + } + } + + /* + * Commands that have motion components can be doubled to + * imply the current line. + */ + if (ismotion != NULL && ismotion->key != key && !LF_ISSET(V_MOVE)) { + msgq(sp, M_ERR, "210|%s may not be used as a motion command", + KEY_NAME(sp, key)); + return (GC_ERR); + } + + /* Required character. */ + if (LF_ISSET(V_CHAR)) + KEY(vp->character, 0); + + /* Get any associated cursor word. */ + if (F_ISSET(kp, V_KEYW) && v_keyword(sp)) + return (GC_ERR); + + return (GC_OK); + +esc: switch (cpart) { + case COMMANDMODE: + msgq(sp, M_BERR, "211|Already in command mode"); + return (GC_ERR_NOFLUSH); + case ISPARTIAL: + break; + case NOTPARTIAL: + (void)sp->gp->scr_bell(sp); + break; + } + return (GC_ERR); +} + +/* + * v_motion -- + * + * Get resulting motion mark. + */ +static int +v_motion(sp, dm, vp, mappedp) + SCR *sp; + VICMD *dm, *vp; + int *mappedp; +{ + VICMD motion; + size_t len; + u_long cnt; + u_int flags; + int tilde_reset, notused; + + /* + * If '.' command, use the dot motion, else get the motion command. + * Clear any line motion flags, the subsequent motion isn't always + * the same, i.e. "/aaa" may or may not be a line motion. + */ + if (F_ISSET(vp, VC_ISDOT)) { + motion = *dm; + F_SET(&motion, VC_ISDOT); + F_CLR(&motion, VM_COMMASK); + } else { + memset(&motion, 0, sizeof(VICMD)); + if (v_cmd(sp, NULL, &motion, vp, ¬used, mappedp) != GC_OK) + return (1); + } + + /* + * A count may be provided both to the command and to the motion, in + * which case the count is multiplicative. For example, "3y4y" is the + * same as "12yy". This count is provided to the motion command and + * not to the regular function. + */ + cnt = motion.count = F_ISSET(&motion, VC_C1SET) ? motion.count : 1; + if (F_ISSET(vp, VC_C1SET)) { + motion.count *= vp->count; + F_SET(&motion, VC_C1SET); + + /* + * Set flags to restore the original values of the command + * structure so dot commands can change the count values, + * e.g. "2dw" "3." deletes a total of five words. + */ + F_CLR(vp, VC_C1SET); + F_SET(vp, VC_C1RESET); + } + + /* + * Some commands can be repeated to indicate the current line. In + * this case, or if the command is a "line command", set the flags + * appropriately. If not a doubled command, run the function to get + * the resulting mark. + */ + if (vp->key == motion.key) { + F_SET(vp, VM_LDOUBLE | VM_LMODE); + + /* Set the origin of the command. */ + vp->m_start.lno = sp->lno; + vp->m_start.cno = 0; + + /* + * Set the end of the command. + * + * If the current line is missing, i.e. the file is empty, + * historic vi permitted a "cc" or "!!" command to insert + * text. + */ + vp->m_stop.lno = sp->lno + motion.count - 1; + if (db_get(sp, vp->m_stop.lno, 0, NULL, &len)) { + if (vp->m_stop.lno != 1 || + vp->key != 'c' && vp->key != '!') { + v_emsg(sp, NULL, VIM_EMPTY); + return (1); + } + vp->m_stop.cno = 0; + } else + vp->m_stop.cno = len ? len - 1 : 0; + } else { + /* + * Motion commands change the underlying movement (*snarl*). + * For example, "l" is illegal at the end of a line, but "dl" + * is not. Set flags so the function knows the situation. + */ + motion.rkp = vp->kp; + + /* + * XXX + * Use yank instead of creating a new motion command, it's a + * lot easier for now. + */ + if (vp->kp == &tmotion) { + tilde_reset = 1; + vp->kp = &vikeys['y']; + } else + tilde_reset = 0; + + /* + * Copy the key flags into the local structure, except for the + * RCM flags -- the motion command will set the RCM flags in + * the vp structure if necessary. This means that the motion + * command is expected to determine where the cursor ends up! + * However, we save off the current RCM mask and restore it if + * it no RCM flags are set by the motion command, with a small + * modification. + * + * We replace the VM_RCM_SET flag with the VM_RCM flag. This + * is so that cursor movement doesn't set the relative position + * unless the motion command explicitly specified it. This + * appears to match historic practice, but I've never been able + * to develop a hard-and-fast rule. + */ + flags = F_ISSET(vp, VM_RCM_MASK); + if (LF_ISSET(VM_RCM_SET)) { + LF_SET(VM_RCM); + LF_CLR(VM_RCM_SET); + } + F_CLR(vp, VM_RCM_MASK); + F_SET(&motion, motion.kp->flags & ~VM_RCM_MASK); + + /* + * Set the three cursor locations to the current cursor. This + * permits commands like 'j' and 'k', that are line oriented + * motions and have special cursor suck semantics when they are + * used as standalone commands, to ignore column positioning. + */ + motion.m_final.lno = + motion.m_stop.lno = motion.m_start.lno = sp->lno; + motion.m_final.cno = + motion.m_stop.cno = motion.m_start.cno = sp->cno; + + /* Run the function. */ + if ((motion.kp->func)(sp, &motion)) + return (1); + + /* + * If the current line is missing, i.e. the file is empty, + * historic vi allowed "c<motion>" or "!<motion>" to insert + * text. Otherwise fail -- most motion commands will have + * already failed, but some, e.g. G, succeed in empty files. + */ + if (!db_exist(sp, vp->m_stop.lno)) { + if (vp->m_stop.lno != 1 || + vp->key != 'c' && vp->key != '!') { + v_emsg(sp, NULL, VIM_EMPTY); + return (1); + } + vp->m_stop.cno = 0; + } + + /* + * XXX + * See above. + */ + if (tilde_reset) + vp->kp = &tmotion; + + /* + * Copy cut buffer, line mode and cursor position information + * from the motion command structure, i.e. anything that the + * motion command can set for us. The commands can flag the + * movement as a line motion (see v_sentence) as well as set + * the VM_RCM_* flags explicitly. + */ + F_SET(vp, F_ISSET(&motion, VM_COMMASK | VM_RCM_MASK)); + + /* + * If the motion command set no relative motion flags, use + * the (slightly) modified previous values. + */ + if (!F_ISSET(vp, VM_RCM_MASK)) + F_SET(vp, flags); + + /* + * Commands can change behaviors based on the motion command + * used, for example, the ! command repeated the last bang + * command if N or n was used as the motion. + */ + vp->rkp = motion.kp; + + /* + * Motion commands can reset all of the cursor information. + * If the motion is in the reverse direction, switch the + * from and to MARK's so that it's in a forward direction. + * Motions are from the from MARK to the to MARK (inclusive). + */ + if (motion.m_start.lno > motion.m_stop.lno || + motion.m_start.lno == motion.m_stop.lno && + motion.m_start.cno > motion.m_stop.cno) { + vp->m_start = motion.m_stop; + vp->m_stop = motion.m_start; + } else { + vp->m_start = motion.m_start; + vp->m_stop = motion.m_stop; + } + vp->m_final = motion.m_final; + } + + /* + * If the command sets dot, save the motion structure. The motion + * count was changed above and needs to be reset, that's why this + * is done here, and not in the calling routine. + */ + if (F_ISSET(vp->kp, V_DOT)) { + *dm = motion; + dm->count = cnt; + } + return (0); +} + +/* + * v_init -- + * Initialize the vi screen. + */ +static int +v_init(sp) + SCR *sp; +{ + GS *gp; + VI_PRIVATE *vip; + + gp = sp->gp; + vip = VIP(sp); + + /* Switch into vi. */ + if (gp->scr_screen(sp, SC_VI)) + return (1); + (void)gp->scr_attr(sp, SA_ALTERNATE, 1); + + F_CLR(sp, SC_EX | SC_SCR_EX); + F_SET(sp, SC_VI); + + /* + * Initialize screen values. + * + * Small windows: see vs_refresh(), section 6a. + * + * Setup: + * t_minrows is the minimum rows to display + * t_maxrows is the maximum rows to display (rows - 1) + * t_rows is the rows currently being displayed + */ + sp->rows = vip->srows = O_VAL(sp, O_LINES); + sp->cols = O_VAL(sp, O_COLUMNS); + sp->t_rows = sp->t_minrows = O_VAL(sp, O_WINDOW); + if (sp->rows != 1) { + if (sp->t_rows > sp->rows - 1) { + sp->t_minrows = sp->t_rows = sp->rows - 1; + msgq(sp, M_INFO, + "214|Windows option value is too large, max is %u", + sp->t_rows); + } + sp->t_maxrows = sp->rows - 1; + } else + sp->t_maxrows = 1; + sp->woff = 0; + + /* Create a screen map. */ + CALLOC_RET(sp, HMAP, SMAP *, SIZE_HMAP(sp), sizeof(SMAP)); + TMAP = HMAP + (sp->t_rows - 1); + HMAP->lno = sp->lno; + HMAP->coff = 0; + HMAP->soff = 1; + + /* + * Fill the screen map from scratch -- try and center the line. That + * way if we're starting with a file we've seen before, we'll put the + * line in the middle, otherwise, it won't work and we'll end up with + * the line at the top. + */ + F_SET(sp, SC_SCR_REFORMAT | SC_SCR_CENTER); + + /* Invalidate the cursor. */ + F_SET(vip, VIP_CUR_INVALID); + + /* Paint the screen image from scratch. */ + F_SET(vip, VIP_N_EX_PAINT); + + return (0); +} + +/* + * v_dtoh -- + * Move all but the current screen to the hidden queue. + */ +static void +v_dtoh(sp) + SCR *sp; +{ + GS *gp; + SCR *tsp; + int hidden; + + /* Move all screens to the hidden queue, tossing screen maps. */ + for (hidden = 0, gp = sp->gp; + (tsp = gp->dq.cqh_first) != (void *)&gp->dq; ++hidden) { + if (_HMAP(tsp) != NULL) { + free(_HMAP(tsp)); + _HMAP(tsp) = NULL; + } + CIRCLEQ_REMOVE(&gp->dq, tsp, q); + CIRCLEQ_INSERT_TAIL(&gp->hq, tsp, q); + } + + /* Move current screen back to the display queue. */ + CIRCLEQ_REMOVE(&gp->hq, sp, q); + CIRCLEQ_INSERT_TAIL(&gp->dq, sp, q); + + /* + * XXX + * Don't bother internationalizing this message, it's going to + * go away as soon as we have one-line screens. --TK + */ + if (hidden > 1) + msgq(sp, M_INFO, + "%d screens backgrounded; use :display to list them", + hidden - 1); +} + +/* + * v_keyword -- + * Get the word (or non-word) the cursor is on. + */ +static int +v_keyword(sp) + SCR *sp; +{ + VI_PRIVATE *vip; + size_t beg, end, len; + int moved, state; + char *p; + + if (db_get(sp, sp->lno, DBG_FATAL, &p, &len)) + return (1); + + /* + * !!! + * Historically, tag commands skipped over any leading whitespace + * characters. Make this true in general when using cursor words. + * If movement, getting a cursor word implies moving the cursor to + * its beginning. Refresh now. + * + * !!! + * Find the beginning/end of the keyword. Keywords are currently + * used for cursor-word searching and for tags. Historical vi + * only used the word in a tag search from the cursor to the end + * of the word, i.e. if the cursor was on the 'b' in " abc ", the + * tag was "bc". For consistency, we make cursor word searches + * follow the same rule. + */ + for (moved = 0, + beg = sp->cno; beg < len && isspace(p[beg]); moved = 1, ++beg); + if (beg >= len) { + msgq(sp, M_BERR, "212|Cursor not in a word"); + return (1); + } + if (moved) { + sp->cno = beg; + (void)vs_refresh(sp, 0); + } + + /* Find the end of the word. */ + for (state = inword(p[beg]), + end = beg; ++end < len && state == inword(p[end]);); + + vip = VIP(sp); + len = (end - beg); + BINC_RET(sp, vip->keyw, vip->klen, len); + memmove(vip->keyw, p + beg, len); + vip->keyw[len] = '\0'; /* XXX */ + return (0); +} + +/* + * v_alias -- + * Check for a command alias. + */ +static VIKEYS const * +v_alias(sp, vp, kp) + SCR *sp; + VICMD *vp; + VIKEYS const *kp; +{ + CHAR_T push; + + switch (vp->key) { + case 'C': /* C -> c$ */ + push = '$'; + vp->key = 'c'; + break; + case 'D': /* D -> d$ */ + push = '$'; + vp->key = 'd'; + break; + case 'S': /* S -> c_ */ + push = '_'; + vp->key = 'c'; + break; + case 'Y': /* Y -> y_ */ + push = '_'; + vp->key = 'y'; + break; + default: + return (kp); + } + return (v_event_push(sp, + NULL, &push, 1, CH_NOMAP | CH_QUOTED) ? NULL : &vikeys[vp->key]); +} + +/* + * v_count -- + * Return the next count. + */ +static int +v_count(sp, fkey, countp) + SCR *sp; + ARG_CHAR_T fkey; + u_long *countp; +{ + EVENT ev; + u_long count, tc; + + ev.e_c = fkey; + count = tc = 0; + do { + /* + * XXX + * Assume that overflow results in a smaller number. + */ + tc = count * 10 + ev.e_c - '0'; + if (count > tc) { + /* Toss to the next non-digit. */ + do { + if (v_key(sp, 0, &ev, + EC_MAPCOMMAND | EC_MAPNODIGIT) != GC_OK) + return (1); + } while (isdigit(ev.e_c)); + msgq(sp, M_ERR, + "235|Number larger than %lu", ULONG_MAX); + return (1); + } + count = tc; + if (v_key(sp, 0, &ev, EC_MAPCOMMAND | EC_MAPNODIGIT) != GC_OK) + return (1); + } while (isdigit(ev.e_c)); + *countp = count; + return (0); +} + +/* + * v_key -- + * Return the next event. + */ +static gcret_t +v_key(sp, command_events, evp, ec_flags) + SCR *sp; + int command_events; + EVENT *evp; + u_int32_t ec_flags; +{ + u_int32_t quote; + + for (quote = 0;;) { + if (v_event_get(sp, evp, 0, ec_flags | quote)) + return (GC_FATAL); + quote = 0; + + switch (evp->e_event) { + case E_CHARACTER: + /* + * !!! + * Historically, ^V was ignored in the command stream, + * although it had a useful side-effect of interrupting + * mappings. Adding a quoting bit to the call probably + * extends historic practice, but it feels right. + */ + if (evp->e_value == K_VLNEXT) { + quote = EC_QUOTED; + break; + } + return (GC_OK); + case E_ERR: + case E_EOF: + return (GC_FATAL); + case E_INTERRUPT: + /* + * !!! + * Historically, vi beeped on command level interrupts. + * + * Historically, vi exited to ex mode if no file was + * named on the command line, and two interrupts were + * generated in a row. (Just figured you might want + * to know that.) + */ + (void)sp->gp->scr_bell(sp); + return (GC_INTERRUPT); + case E_REPAINT: + if (vs_repaint(sp, evp)) + return (GC_FATAL); + break; + case E_WRESIZE: + return (GC_ERR); + case E_QUIT: + case E_WRITE: + if (command_events) + return (GC_EVENT); + /* FALLTHROUGH */ + default: + v_event_err(sp, evp); + return (GC_ERR); + } + } + /* NOTREACHED */ +} + +#if defined(DEBUG) && defined(COMLOG) +/* + * v_comlog -- + * Log the contents of the command structure. + */ +static void +v_comlog(sp, vp) + SCR *sp; + VICMD *vp; +{ + TRACE(sp, "vcmd: %c", vp->key); + if (F_ISSET(vp, VC_BUFFER)) + TRACE(sp, " buffer: %c", vp->buffer); + if (F_ISSET(vp, VC_C1SET)) + TRACE(sp, " c1: %lu", vp->count); + if (F_ISSET(vp, VC_C2SET)) + TRACE(sp, " c2: %lu", vp->count2); + TRACE(sp, " flags: 0x%x\n", vp->flags); +} +#endif |
