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cmdbuf.c
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cmdbuf.c
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/*
* Copyright (C) 1984-2023 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information, see the README file.
*/
/*
* Functions which manipulate the command buffer.
* Used only by command() and related functions.
*/
#include "less.h"
#include "cmd.h"
#include "charset.h"
#if HAVE_STAT
#include <sys/stat.h>
#endif
extern int sc_width;
extern int utf_mode;
extern int no_hist_dups;
extern int marks_modified;
static char cmdbuf[CMDBUF_SIZE]; /* Buffer for holding a multi-char command */
static int cmd_col; /* Current column of the cursor */
static int prompt_col; /* Column of cursor just after prompt */
static char *cp; /* Pointer into cmdbuf */
static int cmd_offset; /* Index into cmdbuf of first displayed char */
static int literal; /* Next input char should not be interpreted */
public size_t updown_match; /* Prefix length in up/down movement */
public lbool have_updown_match = FALSE;
#if TAB_COMPLETE_FILENAME
static int cmd_complete(int action);
/*
* These variables are statics used by cmd_complete.
*/
static lbool in_completion = FALSE;
static char *tk_text;
static char *tk_original;
static constant char *tk_ipoint;
static constant char *tk_trial = NULL;
static struct textlist tk_tlist;
#endif
static int cmd_left();
static int cmd_right();
#if SPACES_IN_FILENAMES
public char openquote = '"';
public char closequote = '"';
#endif
#if CMD_HISTORY
/* History file */
#define HISTFILE_FIRST_LINE ".less-history-file:"
#define HISTFILE_SEARCH_SECTION ".search"
#define HISTFILE_SHELL_SECTION ".shell"
#define HISTFILE_MARK_SECTION ".mark"
/*
* A mlist structure represents a command history.
*/
struct mlist
{
struct mlist *next;
struct mlist *prev;
struct mlist *curr_mp;
char *string;
lbool modified;
};
/*
* These are the various command histories that exist.
*/
struct mlist mlist_search =
{ &mlist_search, &mlist_search, &mlist_search, NULL, 0 };
public void *ml_search = (void *) &mlist_search;
struct mlist mlist_examine =
{ &mlist_examine, &mlist_examine, &mlist_examine, NULL, 0 };
public void *ml_examine = (void *) &mlist_examine;
#if SHELL_ESCAPE || PIPEC
struct mlist mlist_shell =
{ &mlist_shell, &mlist_shell, &mlist_shell, NULL, 0 };
public void *ml_shell = (void *) &mlist_shell;
#endif
#else /* CMD_HISTORY */
/* If CMD_HISTORY is off, these are just flags. */
public void *ml_search = (void *)1;
public void *ml_examine = (void *)2;
#if SHELL_ESCAPE || PIPEC
public void *ml_shell = (void *)3;
#endif
#endif /* CMD_HISTORY */
/*
* History for the current command.
*/
static struct mlist *curr_mlist = NULL;
static int curr_cmdflags;
static char cmd_mbc_buf[MAX_UTF_CHAR_LEN];
static int cmd_mbc_buf_len;
static int cmd_mbc_buf_index;
/*
* Reset command buffer (to empty).
*/
public void cmd_reset(void)
{
cp = cmdbuf;
*cp = '\0';
cmd_col = 0;
cmd_offset = 0;
literal = 0;
cmd_mbc_buf_len = 0;
have_updown_match = FALSE;
}
/*
* Clear command line.
*/
public void clear_cmd(void)
{
cmd_col = prompt_col = 0;
cmd_mbc_buf_len = 0;
have_updown_match = FALSE;
}
/*
* Display a string, usually as a prompt for input into the command buffer.
*/
public void cmd_putstr(constant char *s)
{
LWCHAR prev_ch = 0;
LWCHAR ch;
constant char *endline = s + strlen(s);
while (*s != '\0')
{
constant char *os = s;
int width;
ch = step_charc(&s, +1, endline);
while (os < s)
putchr(*os++);
if (!utf_mode)
width = 1;
else if (is_composing_char(ch) || is_combining_char(prev_ch, ch))
width = 0;
else
width = is_wide_char(ch) ? 2 : 1;
cmd_col += width;
prompt_col += width;
prev_ch = ch;
}
}
/*
* How many characters are in the command buffer?
*/
public int len_cmdbuf(void)
{
constant char *s = cmdbuf;
constant char *endline = s + strlen(s);
int len = 0;
while (*s != '\0')
{
step_charc(&s, +1, endline);
len++;
}
return (len);
}
/*
* Common part of cmd_step_right() and cmd_step_left().
* {{ Returning pwidth and bswidth separately is a historical artifact
* since they're always the same. Maybe clean this up someday. }}
*/
static constant char * cmd_step_common(char *p, LWCHAR ch, size_t len, int *pwidth, int *bswidth)
{
constant char *pr;
int width;
if (len == 1)
{
pr = prchar(ch);
width = (int) strlen(pr);
} else
{
pr = prutfchar(ch);
if (is_composing_char(ch))
width = 0;
else if (is_ubin_char(ch))
width = (int) strlen(pr);
else
{
LWCHAR prev_ch = step_char(&p, -1, cmdbuf);
if (is_combining_char(prev_ch, ch))
width = 0;
else
width = is_wide_char(ch) ? 2 : 1;
}
}
if (pwidth != NULL)
*pwidth = width;
if (bswidth != NULL)
*bswidth = width;
return (pr);
}
/*
* Step a pointer one character right in the command buffer.
*/
static constant char * cmd_step_right(char **pp, int *pwidth, int *bswidth)
{
char *p = *pp;
LWCHAR ch = step_char(pp, +1, p + strlen(p));
return cmd_step_common(p, ch, ptr_diff(*pp, p), pwidth, bswidth);
}
/*
* Step a pointer one character left in the command buffer.
*/
static constant char * cmd_step_left(char **pp, int *pwidth, int *bswidth)
{
char *p = *pp;
LWCHAR ch = step_char(pp, -1, cmdbuf);
return cmd_step_common(*pp, ch, ptr_diff(p, *pp), pwidth, bswidth);
}
/*
* Put the cursor at "home" (just after the prompt),
* and set cp to the corresponding char in cmdbuf.
*/
static void cmd_home(void)
{
while (cmd_col > prompt_col)
{
int width, bswidth;
cmd_step_left(&cp, &width, &bswidth);
while (bswidth-- > 0)
putbs();
cmd_col -= width;
}
cp = &cmdbuf[cmd_offset];
}
/*
* Repaint the line from cp onwards.
* Then position the cursor just after the char old_cp (a pointer into cmdbuf).
*/
public void cmd_repaint(constant char *old_cp)
{
/*
* Repaint the line from the current position.
*/
if (old_cp == NULL)
{
old_cp = cp;
cmd_home();
}
clear_eol();
while (*cp != '\0')
{
char *np = cp;
int width;
constant char *pr = cmd_step_right(&np, &width, NULL);
if (cmd_col + width >= sc_width)
break;
cp = np;
putstr(pr);
cmd_col += width;
}
while (*cp != '\0')
{
char *np = cp;
int width;
constant char *pr = cmd_step_right(&np, &width, NULL);
if (width > 0)
break;
cp = np;
putstr(pr);
}
/*
* Back up the cursor to the correct position.
*/
while (cp > old_cp)
cmd_left();
}
/*
* Shift the cmdbuf display left a half-screen.
*/
static void cmd_lshift(void)
{
char *s;
char *save_cp;
int cols;
/*
* Start at the first displayed char, count how far to the
* right we'd have to move to reach the center of the screen.
*/
s = cmdbuf + cmd_offset;
cols = 0;
while (cols < (sc_width - prompt_col) / 2 && *s != '\0')
{
int width;
cmd_step_right(&s, &width, NULL);
cols += width;
}
while (*s != '\0')
{
int width;
char *ns = s;
cmd_step_right(&ns, &width, NULL);
if (width > 0)
break;
s = ns;
}
cmd_offset = (int) (s - cmdbuf);
save_cp = cp;
cmd_home();
cmd_repaint(save_cp);
}
/*
* Shift the cmdbuf display right a half-screen.
*/
static void cmd_rshift(void)
{
char *s;
char *save_cp;
int cols;
/*
* Start at the first displayed char, count how far to the
* left we'd have to move to traverse a half-screen width
* of displayed characters.
*/
s = cmdbuf + cmd_offset;
cols = 0;
while (cols < (sc_width - prompt_col) / 2 && s > cmdbuf)
{
int width;
cmd_step_left(&s, &width, NULL);
cols += width;
}
cmd_offset = (int) (s - cmdbuf);
save_cp = cp;
cmd_home();
cmd_repaint(save_cp);
}
/*
* Move cursor right one character.
*/
static int cmd_right(void)
{
constant char *pr;
char *ncp;
int width;
if (*cp == '\0')
{
/* Already at the end of the line. */
return (CC_OK);
}
ncp = cp;
pr = cmd_step_right(&ncp, &width, NULL);
if (cmd_col + width >= sc_width)
cmd_lshift();
else if (cmd_col + width == sc_width - 1 && cp[1] != '\0')
cmd_lshift();
cp = ncp;
cmd_col += width;
putstr(pr);
while (*cp != '\0')
{
pr = cmd_step_right(&ncp, &width, NULL);
if (width > 0)
break;
putstr(pr);
cp = ncp;
}
return (CC_OK);
}
/*
* Move cursor left one character.
*/
static int cmd_left(void)
{
char *ncp;
int width = 0;
int bswidth = 0;
if (cp <= cmdbuf)
{
/* Already at the beginning of the line */
return (CC_OK);
}
ncp = cp;
while (ncp > cmdbuf)
{
cmd_step_left(&ncp, &width, &bswidth);
if (width > 0)
break;
}
if (cmd_col < prompt_col + width)
cmd_rshift();
cp = ncp;
cmd_col -= width;
while (bswidth-- > 0)
putbs();
return (CC_OK);
}
/*
* Insert a char into the command buffer, at the current position.
*/
static int cmd_ichar(constant char *cs, size_t clen)
{
char *s;
if (strlen(cmdbuf) + clen >= sizeof(cmdbuf)-1)
{
/* No room in the command buffer for another char. */
bell();
return (CC_ERROR);
}
/*
* Make room for the new character (shift the tail of the buffer right).
*/
for (s = &cmdbuf[strlen(cmdbuf)]; s >= cp; s--)
s[clen] = s[0];
/*
* Insert the character into the buffer.
*/
for (s = cp; s < cp + clen; s++)
*s = *cs++;
/*
* Reprint the tail of the line from the inserted char.
*/
have_updown_match = FALSE;
cmd_repaint(cp);
cmd_right();
return (CC_OK);
}
/*
* Backspace in the command buffer.
* Delete the char to the left of the cursor.
*/
static int cmd_erase(void)
{
char *s;
int clen;
if (cp == cmdbuf)
{
/*
* Backspace past beginning of the buffer:
* this usually means abort the command.
*/
return (CC_QUIT);
}
/*
* Move cursor left (to the char being erased).
*/
s = cp;
cmd_left();
clen = (int) (s - cp);
/*
* Remove the char from the buffer (shift the buffer left).
*/
for (s = cp; ; s++)
{
s[0] = s[clen];
if (s[0] == '\0')
break;
}
/*
* Repaint the buffer after the erased char.
*/
have_updown_match = FALSE;
cmd_repaint(cp);
/*
* We say that erasing the entire command string causes us
* to abort the current command, if CF_QUIT_ON_ERASE is set.
*/
if ((curr_cmdflags & CF_QUIT_ON_ERASE) && cp == cmdbuf && *cp == '\0')
return (CC_QUIT);
return (CC_OK);
}
/*
* Delete the char under the cursor.
*/
static int cmd_delete(void)
{
if (*cp == '\0')
{
/* At end of string; there is no char under the cursor. */
return (CC_OK);
}
/*
* Move right, then use cmd_erase.
*/
cmd_right();
cmd_erase();
return (CC_OK);
}
/*
* Delete the "word" to the left of the cursor.
*/
static int cmd_werase(void)
{
if (cp > cmdbuf && cp[-1] == ' ')
{
/*
* If the char left of cursor is a space,
* erase all the spaces left of cursor (to the first non-space).
*/
while (cp > cmdbuf && cp[-1] == ' ')
(void) cmd_erase();
} else
{
/*
* If the char left of cursor is not a space,
* erase all the nonspaces left of cursor (the whole "word").
*/
while (cp > cmdbuf && cp[-1] != ' ')
(void) cmd_erase();
}
return (CC_OK);
}
/*
* Delete the "word" under the cursor.
*/
static int cmd_wdelete(void)
{
if (*cp == ' ')
{
/*
* If the char under the cursor is a space,
* delete it and all the spaces right of cursor.
*/
while (*cp == ' ')
(void) cmd_delete();
} else
{
/*
* If the char under the cursor is not a space,
* delete it and all nonspaces right of cursor (the whole word).
*/
while (*cp != ' ' && *cp != '\0')
(void) cmd_delete();
}
return (CC_OK);
}
/*
* Delete all chars in the command buffer.
*/
static int cmd_kill(void)
{
if (cmdbuf[0] == '\0')
{
/* Buffer is already empty; abort the current command. */
return (CC_QUIT);
}
cmd_offset = 0;
cmd_home();
*cp = '\0';
have_updown_match = FALSE;
cmd_repaint(cp);
/*
* We say that erasing the entire command string causes us
* to abort the current command, if CF_QUIT_ON_ERASE is set.
*/
if (curr_cmdflags & CF_QUIT_ON_ERASE)
return (CC_QUIT);
return (CC_OK);
}
/*
* Select an mlist structure to be the current command history.
*/
public void set_mlist(void *mlist, int cmdflags)
{
#if CMD_HISTORY
curr_mlist = (struct mlist *) mlist;
curr_cmdflags = cmdflags;
/* Make sure the next up-arrow moves to the last string in the mlist. */
if (curr_mlist != NULL)
curr_mlist->curr_mp = curr_mlist;
#endif
}
#if CMD_HISTORY
/*
* Move up or down in the currently selected command history list.
* Only consider entries whose first updown_match chars are equal to
* cmdbuf's corresponding chars.
*/
static int cmd_updown(int action)
{
constant char *s;
struct mlist *ml;
if (curr_mlist == NULL)
{
/*
* The current command has no history list.
*/
bell();
return (CC_OK);
}
if (!have_updown_match)
{
updown_match = ptr_diff(cp, cmdbuf);
have_updown_match = TRUE;
}
/*
* Find the next history entry which matches.
*/
for (ml = curr_mlist->curr_mp;;)
{
ml = (action == EC_UP) ? ml->prev : ml->next;
if (ml == curr_mlist)
{
/*
* We reached the end (or beginning) of the list.
*/
break;
}
if (strncmp(cmdbuf, ml->string, updown_match) == 0)
{
/*
* This entry matches; stop here.
* Copy the entry into cmdbuf and echo it on the screen.
*/
curr_mlist->curr_mp = ml;
s = ml->string;
if (s == NULL)
s = "";
cmd_offset = 0;
cmd_home();
clear_eol();
strcpy(cmdbuf, s);
for (cp = cmdbuf; *cp != '\0'; )
cmd_right();
return (CC_OK);
}
}
/*
* We didn't find a history entry that matches.
*/
bell();
return (CC_OK);
}
#endif
/*
*
*/
static void ml_link(struct mlist *mlist, struct mlist *ml)
{
ml->next = mlist;
ml->prev = mlist->prev;
mlist->prev->next = ml;
mlist->prev = ml;
}
/*
*
*/
static void ml_unlink(struct mlist *ml)
{
ml->prev->next = ml->next;
ml->next->prev = ml->prev;
}
/*
* Add a string to an mlist.
*/
public void cmd_addhist(struct mlist *mlist, constant char *cmd, lbool modified)
{
#if CMD_HISTORY
struct mlist *ml;
/*
* Don't save a trivial command.
*/
if (strlen(cmd) == 0)
return;
if (no_hist_dups)
{
struct mlist *next = NULL;
for (ml = mlist->next; ml->string != NULL; ml = next)
{
next = ml->next;
if (strcmp(ml->string, cmd) == 0)
{
ml_unlink(ml);
free(ml->string);
free(ml);
}
}
}
/*
* Save the command unless it's a duplicate of the
* last command in the history.
*/
ml = mlist->prev;
if (ml == mlist || strcmp(ml->string, cmd) != 0)
{
/*
* Did not find command in history.
* Save the command and put it at the end of the history list.
*/
ml = (struct mlist *) ecalloc(1, sizeof(struct mlist));
ml->string = save(cmd);
ml->modified = modified;
ml_link(mlist, ml);
}
/*
* Point to the cmd just after the just-accepted command.
* Thus, an UPARROW will always retrieve the previous command.
*/
mlist->curr_mp = ml->next;
#endif
}
/*
* Accept the command in the command buffer.
* Add it to the currently selected history list.
*/
public void cmd_accept(void)
{
#if CMD_HISTORY
/*
* Nothing to do if there is no currently selected history list.
*/
if (curr_mlist == NULL || curr_mlist == ml_examine)
return;
cmd_addhist(curr_mlist, cmdbuf, TRUE);
curr_mlist->modified = TRUE;
#endif
}
/*
* Try to perform a line-edit function on the command buffer,
* using a specified char as a line-editing command.
* Returns:
* CC_PASS The char does not invoke a line edit function.
* CC_OK Line edit function done.
* CC_QUIT The char requests the current command to be aborted.
*/
static int cmd_edit(char c)
{
int action;
int flags;
#if TAB_COMPLETE_FILENAME
#define not_in_completion() in_completion = 0
#else
#define not_in_completion(void)
#endif
/*
* See if the char is indeed a line-editing command.
*/
flags = 0;
#if CMD_HISTORY
if (curr_mlist == NULL)
/*
* No current history; don't accept history manipulation cmds.
*/
flags |= ECF_NOHISTORY;
#endif
#if TAB_COMPLETE_FILENAME
if (curr_mlist == ml_search || curr_mlist == NULL)
/*
* Don't accept file-completion cmds in contexts
* such as search pattern, digits, long option name, etc.
*/
flags |= ECF_NOCOMPLETE;
#endif
action = editchar(c, flags);
switch (action)
{
case A_NOACTION:
return (CC_OK);
case EC_RIGHT:
not_in_completion();
return (cmd_right());
case EC_LEFT:
not_in_completion();
return (cmd_left());
case EC_W_RIGHT:
not_in_completion();
while (*cp != '\0' && *cp != ' ')
cmd_right();
while (*cp == ' ')
cmd_right();
return (CC_OK);
case EC_W_LEFT:
not_in_completion();
while (cp > cmdbuf && cp[-1] == ' ')
cmd_left();
while (cp > cmdbuf && cp[-1] != ' ')
cmd_left();
return (CC_OK);
case EC_HOME:
not_in_completion();
cmd_offset = 0;
cmd_home();
cmd_repaint(cp);
return (CC_OK);
case EC_END:
not_in_completion();
while (*cp != '\0')
cmd_right();
return (CC_OK);
case EC_INSERT:
not_in_completion();
return (CC_OK);
case EC_BACKSPACE:
not_in_completion();
return (cmd_erase());
case EC_LINEKILL:
not_in_completion();
return (cmd_kill());
case EC_ABORT:
not_in_completion();
(void) cmd_kill();
return (CC_QUIT);
case EC_W_BACKSPACE:
not_in_completion();
return (cmd_werase());
case EC_DELETE:
not_in_completion();
return (cmd_delete());
case EC_W_DELETE:
not_in_completion();
return (cmd_wdelete());
case EC_LITERAL:
literal = 1;
return (CC_OK);
#if CMD_HISTORY
case EC_UP:
case EC_DOWN:
not_in_completion();
return (cmd_updown(action));
#endif
#if TAB_COMPLETE_FILENAME
case EC_F_COMPLETE:
case EC_B_COMPLETE:
case EC_EXPAND:
return (cmd_complete(action));
#endif
default:
not_in_completion();
return (CC_PASS);
}
}
#if TAB_COMPLETE_FILENAME
/*
* Insert a string into the command buffer, at the current position.
*/
static int cmd_istr(constant char *str)
{
constant char *endline = str + strlen(str);
constant char *s;
int action;
for (s = str; *s != '\0'; )
{
constant char *os = s;
step_charc(&s, +1, endline);
action = cmd_ichar(os, ptr_diff(s, os));
if (action != CC_OK)
return (action);
}
return (CC_OK);
}
/*
* Find the beginning and end of the "current" word.
* This is the word which the cursor (cp) is inside or at the end of.
* Return pointer to the beginning of the word and put the
* cursor at the end of the word.
*/
static char * delimit_word(void)
{
char *word;
#if SPACES_IN_FILENAMES
char *p;
int delim_quoted = FALSE;
int meta_quoted = FALSE;
constant char *esc = get_meta_escape();
size_t esclen = strlen(esc);
#endif
/*
* Move cursor to end of word.
*/
if (*cp != ' ' && *cp != '\0')
{
/*
* Cursor is on a nonspace.
* Move cursor right to the next space.
*/
while (*cp != ' ' && *cp != '\0')
cmd_right();
} else if (cp > cmdbuf && cp[-1] != ' ')
{
/*
* Cursor is on a space, and char to the left is a nonspace.
* We're already at the end of the word.
*/
;
#if 0
} else
{
/*
* Cursor is on a space and char to the left is a space.
* Huh? There's no word here.
*/
return (NULL);
#endif
}
/*
* Find the beginning of the word which the cursor is in.
*/
if (cp == cmdbuf)
return (NULL);
#if SPACES_IN_FILENAMES
/*
* If we have an unbalanced quote (that is, an open quote
* without a corresponding close quote), we return everything
* from the open quote, including spaces.
*/
for (word = cmdbuf; word < cp; word++)
if (*word != ' ')
break;
if (word >= cp)
return (cp);
for (p = cmdbuf; p < cp; p++)
{
if (meta_quoted)
{
meta_quoted = FALSE;
} else if (esclen > 0 && p + esclen < cp &&
strncmp(p, esc, esclen) == 0)
{
meta_quoted = TRUE;
p += esclen - 1;
} else if (delim_quoted)
{
if (*p == closequote)
delim_quoted = FALSE;
} else /* (!delim_quoted) */
{
if (*p == openquote)