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vi.c
1977 lines (1845 loc) · 60.8 KB
/
vi.c
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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1982-2014 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* David Korn <dgkorn@gmail.com> *
* *
***********************************************************************/
// Adapted for ksh by David Korn
//
// One line editor for the shell based on the vi editor.
//
// Questions to:
// P.D. Sullivan
// cbosgd!pds
//
#include "config_ast.h" // IWYU pragma: keep
#include <ctype.h>
#include <setjmp.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
#include "ast.h"
#include "defs.h"
#include "edit.h"
#include "history.h"
#include "sfio.h"
#include "stk.h"
#include "terminal.h"
#define MAXCHAR MAXLINE - 2 // max char per line
#define gencpy(a, b) ed_gencpy(a, b)
#define genncpy(a, b, n) ed_genncpy(a, b, n)
#define genlen(str) ed_genlen(str)
#define digit(c) ((c & ~STRIP) == 0 && isdigit(c))
#define is_print(c) ((c & ~STRIP) || isprint(c))
static_fn int _vi_isalph(int);
static_fn int _vi_isblank(int);
#define vi_isblank(v) _vi_isblank(virtual[v])
#define vi_isalph(v) _vi_isalph(virtual[v])
#define fold(c) ((c) & ~040) // lower and uppercase equivalent
#ifndef iswascii
#define iswascii(c) (((c) & ~0177) == 0)
#endif // !iswascii
typedef struct _vi_ {
int direction;
int lastmacro;
char addnl; // boolean - add newline flag
char last_find; // last find command
char last_cmd; // last command
char repeat_set;
char nonewline;
int findchar; // last find char
wchar_t *lastline;
int first_wind; // first column of window
int last_wind; // last column in window
int lastmotion; // last motion
int long_char; // line bigger than window
int long_line; // line bigger than window
int ocur_phys; // old current physical position
int ocur_virt; // old last virtual position
int ofirst_wind; // old window first col
int o_v_char; // prev virtual[ocur_virt]
int repeat; // repeat count for motion cmds
int lastrepeat; // last repeat count for motion cmds
int u_column; // undo current column
int U_saved; // original virtual saved
wchar_t *U_space; // used for U command
wchar_t *u_space; // used for u command
int bigvi;
Edit_t *ed; // pointer to edit data
} Vi_t;
#define editb (*vp->ed)
#undef putchar
#define putchar(c) ed_putchar(vp->ed, c)
#define cur_virt editb.e_cur // current virtual column
#define cur_phys editb.e_pcur // current phys column cursor is at
#define curhline editb.e_hline // current history line
#define first_virt editb.e_fcol // first allowable column
#define globals editb.e_globals // local global variables
#define histmin editb.e_hismin
#define histmax editb.e_hismax
#define last_phys editb.e_peol // last column in physical
#define last_virt editb.e_eol // last column
#define lsearch editb.e_search // last search string
#define lookahead editb.e_lookahead // characters in buffer
#define previous editb.e_lbuf // lookahead buffer
#define max_col editb.e_llimit // maximum column
#define Prompt editb.e_prompt // pointer to prompt
#define plen editb.e_plen // length of prompt
#define physical editb.e_physbuf // physical image
#define usreof editb.e_eof // user defined eof char
#define usrerase editb.e_erase // user defined erase char
#define usrlnext editb.e_lnext // user defined next literal
#define usrkill editb.e_kill // user defined kill char
#define virtual editb.e_inbuf // pointer to virtual image buffer
#define window editb.e_window // window buffer
#define w_size editb.e_wsize // window size
#define inmacro editb.e_inmacro // true when in macro
#define yankbuf editb.e_killbuf // yank/delete buffer
#define ABORT -2 // user abort
#define APPEND -10 // append chars
#define BAD -1 // failure flag
#define BIGVI -15 // user wants real vi
#define CONTROL -20 // control mode
#define ENTER -25 // enter flag
#define GOOD 0 // success flag
#define INPUT -30 // input mode
#define INSERT -35 // insert mode
#define REPLACE -40 // replace chars
#define SEARCH -45 // search flag
#define TRANSLATE -50 // translate virt to phys only
#define INVALID (-1) // invalid column
static const char paren_chars[] = "([{)]}"; // for % command
static_fn void vi_cursor(Vi_t *, int);
static_fn void vi_del_line(Vi_t *, int);
static_fn int vi_getcount(Vi_t *, int);
static_fn void vi_getline(Vi_t *, int);
static_fn int vi_getrchar(Vi_t *);
static_fn int vi_mvcursor(Vi_t *, int);
static_fn void vi_pr_string(Vi_t *, const char *);
static_fn void vi_refresh(Vi_t *, int);
static_fn void vi_replace(Vi_t *, int, int);
static_fn void vi_restore_v(Vi_t *);
static_fn void vi_save_last(Vi_t *);
static_fn void vi_save_v(Vi_t *);
static_fn int vi_search(Vi_t *, int);
static_fn void vi_sync_cursor(Vi_t *);
static_fn int vi_textmod(Vi_t *, int, int);
//
// This routine implements a one line version of vi and is called by _filbuf.c.
// If reedit is non-zero, initialize edit buffer with reedit chars.
//
int ed_viread(void *context, int fd, char *shbuf, int nchar, int reedit) {
Edit_t *ed = context;
int i; // general variable
Vi_t *vp = ed->e_vi;
char prompt[PRSIZE + 2]; // prompt
wchar_t Physical[2 * MAXLINE]; // physical image
wchar_t Ubuf[MAXLINE]; // used for U command
wchar_t ubuf[MAXLINE]; // used for u command
wchar_t Window[MAXLINE]; // window image
int Globals[9]; // local global variables
if (!vp) {
ed->e_vi = vp = calloc(1, sizeof(Vi_t));
vp->lastline = malloc(MAXLINE * CHARSIZE);
vp->direction = -1;
vp->ed = ed;
}
// Setup prompt.
Prompt = prompt;
ed_setup(vp->ed, fd, reedit);
shbuf[reedit] = 0;
// Set raw mode.
if (tty_raw(STDERR_FILENO, 0) < 0) {
return reedit ? reedit : ed_read(context, fd, shbuf, nchar, 0);
}
i = last_virt - 1;
// Initialize some things.
virtual = (wchar_t *)shbuf;
virtual = (wchar_t *)roundof((ptrdiff_t) virtual, sizeof(wchar_t));
shbuf[i + 1] = 0;
i = ed_internal(shbuf, virtual) - 1;
globals = Globals;
cur_phys = i + 1;
cur_virt = i;
first_virt = 0;
vp->first_wind = 0;
last_virt = i;
last_phys = i;
vp->last_wind = i;
vp->long_line = ' ';
vp->long_char = ' ';
vp->o_v_char = '\0';
vp->ocur_phys = 0;
vp->ocur_virt = MAXCHAR;
vp->ofirst_wind = 0;
physical = Physical;
vp->u_column = INVALID - 1;
vp->U_space = Ubuf;
vp->u_space = ubuf;
window = Window;
window[0] = '\0';
if (!yankbuf) yankbuf = malloc(MAXLINE * CHARSIZE);
if (vp->last_cmd == '\0') {
// First time for this shell.
vp->last_cmd = 'i';
vp->findchar = INVALID;
vp->lastmotion = '\0';
vp->lastrepeat = 1;
vp->repeat = 1;
*yankbuf = 0;
}
// Fiddle around with prompt length.
if (nchar + plen > MAXCHAR) nchar = MAXCHAR - plen;
max_col = nchar - 2;
// Handle usrintr, usrquit, or EOF.
i = sigsetjmp(editb.e_env, 0);
if (i != 0) {
if (vp->ed->e_multiline) {
cur_virt = last_virt;
vi_sync_cursor(vp);
}
virtual[0] = '\0';
tty_cooked(STDERR_FILENO);
if (i == UEOF) return 0; // EOF
if (i == UINTR) return -1; // interrupt
return -1;
}
// Get a line from the terminal.
vp->U_saved = 0;
if (reedit) {
cur_phys = vp->first_wind;
vp->ofirst_wind = INVALID;
vi_refresh(vp, INPUT);
}
vi_getline(vp, APPEND);
if (vp->ed->e_multiline) vi_cursor(vp, last_phys);
// Add a new line if user typed unescaped \n to cause the shell to process the line.
tty_cooked(STDERR_FILENO);
if (ed->e_nlist) {
ed->e_nlist = 0;
stkset(ed->sh->stk, ed->e_stkptr, ed->e_stkoff);
}
if (vp->addnl) {
virtual[++last_virt] = '\n';
ed_crlf(vp->ed);
}
if (++last_virt >= 0) {
if (vp->bigvi) {
vp->bigvi = 0;
shbuf[last_virt - 1] = '\n';
} else {
virtual[last_virt] = 0;
last_virt = ed_external(virtual, shbuf);
}
if (vp->ed->nhlist) ed_histlist(vp->ed, 0);
return last_virt;
}
return -1;
}
//
// This routine will append char after cur_virt in the virtual image.
// if mode =
// APPEND, shift chars right before appending
// REPLACE, replace char if possible
//
static_fn void append(Vi_t *vp, int c, int mode) {
int i, j;
if (last_virt < max_col && last_phys < max_col) {
if (mode == APPEND || (cur_virt == last_virt && last_virt >= 0)) {
j = (cur_virt >= 0 ? cur_virt : 0);
for (i = ++last_virt; i > j; --i) virtual[i] = virtual[i - 1];
}
virtual[++cur_virt] = c;
} else {
ed_ringbell();
}
return;
}
//
// This routine will position cur_virt at the nth previous word.
//
static_fn void backword(Vi_t *vp, int nwords, int cmd) {
int tcur_virt = cur_virt;
while (nwords-- && tcur_virt > first_virt) {
if (tcur_virt > first_virt && !vi_isblank(tcur_virt) && vi_isblank(tcur_virt - 1)) {
--tcur_virt;
} else if (cmd != 'B') {
int last = vi_isalph(tcur_virt - 1);
int cur = vi_isalph(tcur_virt);
if ((!cur && last) || (cur && !last)) --tcur_virt;
}
while (tcur_virt >= first_virt && vi_isblank(tcur_virt)) --tcur_virt;
if (cmd == 'B') {
while (tcur_virt >= first_virt && !vi_isblank(tcur_virt)) --tcur_virt;
} else {
if (vi_isalph(tcur_virt)) {
while (vi_isalph(tcur_virt) && tcur_virt >= first_virt) --tcur_virt;
} else {
while (tcur_virt >= first_virt && !vi_isalph(tcur_virt) && !vi_isblank(tcur_virt)) {
--tcur_virt;
}
}
}
cur_virt = ++tcur_virt;
}
return;
}
//
// This routine implements the vi command subset. The cursor will always be positioned at the char
// of interest.
//
static_fn int cntlmode(Vi_t *vp) {
int c;
int i;
wchar_t tmp_u_space[MAXLINE]; // temporary u_space
wchar_t *real_u_space; // points to real u_space
int tmp_u_column = INVALID; // temporary u_column
int was_inmacro;
if (!vp->U_saved) {
// Save virtual image if never done before.
virtual[last_virt + 1] = '\0';
gencpy(vp->U_space, virtual);
vp->U_saved = 1;
}
vi_save_last(vp);
real_u_space = vp->u_space;
curhline = histmax;
first_virt = 0;
vp->repeat = 1;
if (cur_virt > INVALID) {
// Make sure cursor is at the last char.
vi_sync_cursor(vp);
} else if (last_virt > INVALID) {
cur_virt++;
}
// Read control char until something happens to cause a return to APPEND/REPLACE mode.
while ((c = ed_getchar(vp->ed, -1))) {
vp->repeat_set = 0;
was_inmacro = inmacro;
if (c == '0') {
// Move to leftmost column.
cur_virt = 0;
vi_sync_cursor(vp);
continue;
}
if (digit(c)) {
c = vi_getcount(vp, c);
if (c == '.') vp->lastrepeat = vp->repeat;
}
// See if it's a move cursor command.
if (vi_mvcursor(vp, c)) {
vi_sync_cursor(vp);
vp->repeat = 1;
continue;
}
// See if it's a repeat of the last command.
if (c == '.') {
c = vp->last_cmd;
vp->repeat = vp->lastrepeat;
i = vi_textmod(vp, c, c);
} else {
i = vi_textmod(vp, c, 0);
}
// See if it's a text modification command.
switch (i) {
case BAD: {
break;
}
default: { // input mode
if (!was_inmacro) {
vp->last_cmd = c;
vp->lastrepeat = vp->repeat;
}
vp->repeat = 1;
if (i == GOOD) continue;
return i;
}
}
// Other stuff.
switch (c) {
case cntl('L'): {
// Redraw line. Print the prompt and force a total refresh.
if (vp->nonewline == 0 && !vp->ed->e_nocrnl) putchar('\n');
vp->nonewline = 0;
vi_pr_string(vp, Prompt);
window[0] = '\0';
cur_phys = vp->first_wind;
vp->ofirst_wind = INVALID;
vp->long_line = ' ';
break;
}
case cntl('V'): {
vi_save_v(vp);
vi_del_line(vp, BAD);
const char *p = e_version;
while ((c = *p++)) append(vp, c, APPEND);
vi_refresh(vp, CONTROL);
ed_getchar(vp->ed, -1);
vi_restore_v(vp);
ed_ungetchar(vp->ed, 'a');
break;
}
case '/': // search
case '?':
case 'N':
case 'n': {
vi_save_v(vp);
switch (vi_search(vp, c)) {
case GOOD: { // force a total refresh
window[0] = '\0';
goto newhist;
}
case BAD: { // no match
ed_ringbell();
}
// FALLTHRU
default: {
if (vp->u_column == INVALID) {
vi_del_line(vp, BAD);
} else {
vi_restore_v(vp);
}
break;
}
}
break;
}
case 'j': // get next command
case '+': {
if (vp->ed->hlist) {
if (vp->ed->hoff >= vp->ed->hmax) {
ed_ringbell();
vp->repeat = 1;
continue;
}
vp->ed->hoff++;
ed_histlist(vp->ed, *vp->ed->hlist != 0);
vp->nonewline++;
ed_ungetchar(vp->ed, cntl('L'));
continue;
}
curhline += vp->repeat;
if (curhline > histmax) {
curhline = histmax;
ed_ringbell();
vp->repeat = 1;
continue;
} else if (curhline == histmax && tmp_u_column != INVALID) {
vp->u_space = tmp_u_space;
vp->u_column = tmp_u_column;
vi_restore_v(vp);
vp->u_space = real_u_space;
break;
}
vi_save_v(vp);
cur_virt = INVALID;
goto newhist;
}
case 'k': // get previous command
case '-': {
if (vp->ed->hlist) {
if (vp->ed->hoff == 0) {
ed_ringbell();
vp->repeat = 1;
continue;
}
vp->ed->hoff--;
ed_histlist(vp->ed, *vp->ed->hlist != 0);
vp->nonewline++;
ed_ungetchar(vp->ed, cntl('L'));
continue;
}
if (curhline == histmax) {
vp->u_space = tmp_u_space;
i = vp->u_column;
vi_save_v(vp);
vp->u_space = real_u_space;
tmp_u_column = vp->u_column;
vp->u_column = i;
}
curhline -= vp->repeat;
if (curhline <= histmin) {
curhline += vp->repeat;
ed_ringbell();
vp->repeat = 1;
continue;
}
vi_save_v(vp);
cur_virt = INVALID;
newhist:
if (curhline != histmax || cur_virt == INVALID) {
hist_copy((char *)virtual, MAXLINE, curhline, -1);
} else {
strcpy((char *)virtual, (char *)vp->u_space);
ed_internal((char *)vp->u_space, vp->u_space);
}
ed_internal((char *)virtual, virtual);
if ((last_virt = genlen(virtual) - 1) >= 0 && cur_virt == INVALID) cur_virt = 0;
if (vp->ed->hlist) {
ed_histlist(vp->ed, 0);
if (c == '\n') ed_ungetchar(vp->ed, c);
ed_ungetchar(vp->ed, cntl('L'));
vp->nonewline = 1;
cur_virt = 0;
}
break;
}
case 'u': { // undo the last thing done
vi_restore_v(vp);
break;
}
case 'U': { // undo everything
vi_save_v(vp);
if (virtual[0] == '\0') {
ed_ringbell();
vp->repeat = 1;
continue;
} else {
gencpy(virtual, vp->U_space);
last_virt = genlen(vp->U_space) - 1;
cur_virt = 0;
}
break;
}
case 'v': // run command `hist -e ${VISUAL:-${EDITOR:-vi}}`
case 'G': { // fetch command from hist
if (c == 'G' || vp->repeat_set != 0) {
if (vp->repeat_set == 0) vp->repeat = histmin + 1;
if (vp->repeat <= histmin || vp->repeat > histmax) {
ed_ringbell();
vp->repeat = 1;
continue;
}
curhline = vp->repeat;
vi_save_v(vp);
if (c == 'G') {
cur_virt = INVALID;
goto newhist;
}
}
if (ed_fulledit(vp->ed) == GOOD) return BIGVI;
ed_ringbell();
vp->repeat = 1;
continue;
}
// FALLTHRU
case '#': { // insert(delete) # to (no)comment command
if (cur_virt != INVALID) {
wchar_t *p = &virtual[last_virt + 1];
*p = 0;
// See whether first char is comment char.
c = (virtual[0] == '#');
while (p-- >= virtual) {
if (p < virtual || *p == '\n') {
if (c) { // delete '#'
if (p[1] == '#') {
last_virt--;
gencpy(p + 1, p + 2);
}
} else {
cur_virt = p - virtual;
append(vp, '#', APPEND);
}
}
}
if (c) {
curhline = histmax;
cur_virt = 0;
break;
}
vi_refresh(vp, INPUT);
}
}
// FALLTHRU
case '\n': { // send to shell
if (!vp->ed->hlist) return ENTER;
}
// FALLTHRU
case '\t': { // bring choice to edit
if (vp->ed->hlist) {
if (vp->repeat > vp->ed->nhlist - vp->ed->hoff) {
ed_ringbell();
vp->repeat = 1;
continue;
}
curhline = vp->ed->hlist[vp->repeat + vp->ed->hoff - 1]->index;
goto newhist;
}
ed_ringbell();
vp->repeat = 1;
continue;
}
case ESC: { // don't ring bell if next char is '['
if (!lookahead) {
char x;
if (sfpkrd(editb.e_fd, &x, 1, '\r', 400L, -1) > 0) ed_ungetchar(vp->ed, x);
}
if (lookahead) {
ed_ungetchar(vp->ed, c = ed_getchar(vp->ed, 1));
if (c == '[' || c == 'O') {
vp->repeat = 1;
continue;
}
}
ed_ringbell();
vp->repeat = 1;
continue;
}
default: {
ed_ringbell();
vp->repeat = 1;
continue;
}
}
vi_refresh(vp, CONTROL);
vp->repeat = 1;
}
// NOTREACHED
return 0;
}
//
// This routine will position the virtual cursor at physical column x in the window.
//
static_fn void vi_cursor(Vi_t *vp, int x) {
while (physical[x] == MARKER) x++;
cur_phys = ed_setcursor(vp->ed, physical, cur_phys, x, vp->first_wind);
}
//
// Delete nchars from the virtual space and leave cur_virt positioned at cur_virt - 1.
//
// If mode =
// 'c', do not save the characters deleted.
// 'd', save them in yankbuf and delete.
// 'y', save them in yankbuf but do not delete.
//
static_fn void cdelete(Vi_t *vp, int nchars, int mode) {
int i;
wchar_t *cp;
if (cur_virt < first_virt) {
ed_ringbell();
return;
}
if (nchars <= 0) return;
cp = virtual + cur_virt;
vp->o_v_char = cp[0];
if ((cur_virt-- + nchars) > last_virt) {
// Set nchars to number actually deleted.
nchars = last_virt - cur_virt;
}
// Save characters to be deleted.
if (mode != 'c') {
i = cp[nchars];
cp[nchars] = 0;
gencpy(yankbuf, cp);
cp[nchars] = i;
}
// Now delete these characters.
if (mode != 'y') {
gencpy(cp, cp + nchars);
last_virt -= nchars;
}
}
//
// This routine will delete the line. If mode = GOOD, do a vi_save_v().
//
static_fn void vi_del_line(Vi_t *vp, int mode) {
if (last_virt == INVALID) return;
if (mode == GOOD) vi_save_v(vp);
cur_virt = 0;
first_virt = 0;
cdelete(vp, last_virt + 1, BAD);
vi_refresh(vp, CONTROL);
cur_virt = INVALID;
cur_phys = 0;
vp->findchar = INVALID;
last_phys = INVALID;
last_virt = INVALID;
vp->last_wind = INVALID;
vp->first_wind = 0;
vp->o_v_char = '\0';
vp->ocur_phys = 0;
vp->ocur_virt = MAXCHAR;
vp->ofirst_wind = 0;
window[0] = '\0';
return;
}
//
// Delete thru motion.
//
// If mode =
// 'd', save deleted characters, delete
// 'c', do not save characters, change
// 'y', save characters, yank
//
// Returns 1 if operation successful; else 0.
//
static_fn int delmotion(Vi_t *vp, int motion, int mode) {
int begin, end, delta;
if (cur_virt == INVALID) return 0;
if (mode != 'y') vi_save_v(vp);
begin = cur_virt;
// Fake out the motion routines by appending a blank.
virtual[++last_virt] = ' ';
end = vi_mvcursor(vp, motion);
virtual[last_virt--] = 0;
if (!end) return 0;
end = cur_virt;
if (mode == 'c' && end > begin && strchr("wW", motion)) {
// Called by change operation, user really expects the effect of the eE commands, so back up
// to end of word.
while (end > begin && vi_isblank(end - 1)) --end;
if (end == begin) ++end;
}
delta = end - begin;
if (delta >= 0) {
cur_virt = begin;
if (strchr("eE;,TtFf%", motion)) ++delta;
} else {
delta = -delta + (motion == '%');
}
cdelete(vp, delta, mode);
if (mode == 'y') cur_virt = begin;
return 1;
}
//
// This routine will move cur_virt to the end of the nth word.
//
static_fn void endword(Vi_t *vp, int nwords, int cmd) {
int tcur_virt = cur_virt;
while (nwords--) {
if (tcur_virt <= last_virt && !vi_isblank(tcur_virt)) ++tcur_virt;
while (tcur_virt <= last_virt && vi_isblank(tcur_virt)) ++tcur_virt;
if (cmd == 'E') {
while (tcur_virt <= last_virt && !vi_isblank(tcur_virt)) ++tcur_virt;
} else {
if (vi_isalph(tcur_virt)) {
while (tcur_virt <= last_virt && vi_isalph(tcur_virt)) ++tcur_virt;
} else {
while (tcur_virt <= last_virt && !vi_isalph(tcur_virt) && !vi_isblank(tcur_virt)) {
++tcur_virt;
}
}
}
if (tcur_virt > first_virt) tcur_virt--;
}
cur_virt = tcur_virt;
return;
}
//
// This routine will move cur_virt forward to the next nth word.
//
static_fn void forward(Vi_t *vp, int nwords, int cmd) {
int tcur_virt = cur_virt;
while (nwords--) {
if (cmd == 'W') {
while (tcur_virt < last_virt && !vi_isblank(tcur_virt)) ++tcur_virt;
} else {
if (vi_isalph(tcur_virt)) {
while (tcur_virt < last_virt && vi_isalph(tcur_virt)) ++tcur_virt;
} else {
while (tcur_virt < last_virt && !vi_isalph(tcur_virt) && !vi_isblank(tcur_virt)) {
++tcur_virt;
}
}
}
while (tcur_virt < last_virt && vi_isblank(tcur_virt)) ++tcur_virt;
}
cur_virt = tcur_virt;
return;
}
//
// Set repeat to the user typed number and return the terminating character.
//
static_fn int vi_getcount(Vi_t *vp, int c) {
int i;
// Get any repeat count.
if (c == '0') return c;
vp->repeat_set++;
i = 0;
while (digit(c)) {
i = i * 10 + c - '0';
c = ed_getchar(vp->ed, -1);
}
if (i > 0) vp->repeat *= i;
return c;
}
//
// This routine will fetch a line.
// If mode =
// APPEND, allow escape to cntlmode subroutine appending characters.
// REPLACE, allow escape to cntlmode subroutine replacing characters.
// SEARCH, no escape allowed.
// ESC, enter control mode immediately.
//
// The cursor will always be positioned after the last char printed.
//
// This routine returns when cr, nl, or (eof in column 0) is received (column 0 is the first char
// position).
//
static_fn void vi_getline(Vi_t *vp, int mode) {
int c;
int tmp;
int max_virt = 0, last_save = 0;
wchar_t saveline[MAXLINE];
vp->addnl = 1;
if (mode == ESC) {
// Go directly to control mode.
goto escape;
}
for (;;) {
if ((c = ed_getchar(vp->ed, mode == SEARCH ? 1 : -2)) == usreof) {
c = UEOF;
} else if (c == usrerase) {
c = UERASE;
} else if (c == usrkill) {
c = UKILL;
} else if (c == editb.e_werase) {
c = UWERASE;
} else if (c == usrlnext) {
c = ULNEXT;
} else if (mode == SEARCH && c == editb.e_intr) {
c = UINTR;
}
if (c == ULNEXT) {
// Implement ^V to escape next char.
c = ed_getchar(vp->ed, 2);
append(vp, c, mode);
vi_refresh(vp, INPUT);
continue;
}
if (c != '\t') vp->ed->e_tabcount = 0;
switch (c) {
case ESC: { // enter control mode
if (!sh_isoption(vp->ed->sh, SH_VI)) {
append(vp, c, mode);
break;
}
if (mode == SEARCH) {
ed_ringbell();
continue;
} else {
escape:
if (mode == REPLACE) {
c = max_virt - cur_virt;
if (c > 0 && last_save >= cur_virt) {
genncpy((&virtual[cur_virt]), &saveline[cur_virt], c);
if (last_virt >= last_save) last_virt = last_save - 1;
vi_refresh(vp, INPUT);
}
--cur_virt;
}
tmp = cntlmode(vp);
if (tmp == ENTER || tmp == BIGVI) {
vp->bigvi = (tmp == BIGVI);
return;
}
if (tmp == INSERT) {
mode = APPEND;
continue;
}
mode = tmp;
if (mode == REPLACE) {
c = last_save = last_virt + 1;
if (c >= MAXLINE) c = MAXLINE - 1;
genncpy(saveline, virtual, c);
}
}
break;
}
case UINTR: {
first_virt = 0;
cdelete(vp, cur_virt + 1, BAD);
cur_virt = -1;
return;
}
case UERASE: // user erase char -- treat as backspace
case '\b': { // backspace
if (cur_virt >= 0 && virtual[cur_virt] == '\\') {
cdelete(vp, 1, BAD);
append(vp, usrerase, mode);
} else {
if (mode == SEARCH && cur_virt == 0) {
first_virt = 0;
cdelete(vp, 1, BAD);
return;
}
if (mode == REPLACE || (last_save > 0 && last_virt <= last_save)) {
if (cur_virt <= first_virt) {
ed_ringbell();
} else if (mode == REPLACE) {
--cur_virt;
}
mode = REPLACE;
vi_sync_cursor(vp);
continue;
} else {
cdelete(vp, 1, BAD);
}
}
break;
}
case UWERASE: { // delete back word
if (cur_virt > first_virt && !vi_isblank(cur_virt) && !ispunct(virtual[cur_virt]) &&
vi_isblank(cur_virt - 1)) {
cdelete(vp, 1, BAD);
} else {
tmp = cur_virt;
backword(vp, 1, 'W');
cdelete(vp, tmp - cur_virt + 1, BAD);
}
break;
}
case UKILL: { // user kill line char
if (virtual[cur_virt] == '\\') {
cdelete(vp, 1, BAD);
append(vp, usrkill, mode);
} else {
if (mode == SEARCH) {
cur_virt = 1;
delmotion(vp, '$', BAD);
} else if (first_virt) {
tmp = cur_virt;
cur_virt = first_virt;
cdelete(vp, tmp - cur_virt + 1, BAD);
} else {
vi_del_line(vp, GOOD);
}
}
break;
}
case UEOF: { // eof char
if (cur_virt != INVALID) continue;
vp->addnl = 0;
}
// FALLTHRU
case '\n': { // newline or return