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| Current File : //compat/linux/proc/68247/root/usr/src/contrib/less/cmdbuf.c |
/*
* Copyright (C) 1984-2011 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 about less, or for information on how to
* contact the author, 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;
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 */
#if TAB_COMPLETE_FILENAME
static int cmd_complete();
/*
* These variables are statics used by cmd_complete.
*/
static int in_completion = 0;
static char *tk_text;
static char *tk_original;
static char *tk_ipoint;
static char *tk_trial;
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"
/*
* A mlist structure represents a command history.
*/
struct mlist
{
struct mlist *next;
struct mlist *prev;
struct mlist *curr_mp;
char *string;
int modified;
};
/*
* These are the various command histories that exist.
*/
struct mlist mlist_search =
{ &mlist_search, &mlist_search, &mlist_search, NULL, 0 };
public void * constant ml_search = (void *) &mlist_search;
struct mlist mlist_examine =
{ &mlist_examine, &mlist_examine, &mlist_examine, NULL, 0 };
public void * constant ml_examine = (void *) &mlist_examine;
#if SHELL_ESCAPE || PIPEC
struct mlist mlist_shell =
{ &mlist_shell, &mlist_shell, &mlist_shell, NULL, 0 };
public void * constant ml_shell = (void *) &mlist_shell;
#endif
#else /* CMD_HISTORY */
/* If CMD_HISTORY is off, these are just flags. */
public void * constant ml_search = (void *)1;
public void * constant ml_examine = (void *)2;
#if SHELL_ESCAPE || PIPEC
public void * constant 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()
{
cp = cmdbuf;
*cp = '\0';
cmd_col = 0;
cmd_offset = 0;
literal = 0;
cmd_mbc_buf_len = 0;
}
/*
* Clear command line.
*/
public void
clear_cmd()
{
cmd_col = prompt_col = 0;
cmd_mbc_buf_len = 0;
}
/*
* Display a string, usually as a prompt for input into the command buffer.
*/
public void
cmd_putstr(s)
char *s;
{
LWCHAR prev_ch = 0;
LWCHAR ch;
char *endline = s + strlen(s);
while (*s != '\0')
{
char *ns = s;
ch = step_char(&ns, +1, endline);
while (s < ns)
putchr(*s++);
if (!utf_mode)
{
cmd_col++;
prompt_col++;
} else if (!is_composing_char(ch) &&
!is_combining_char(prev_ch, ch))
{
int 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()
{
char *s = cmdbuf;
char *endline = s + strlen(s);
int len = 0;
while (*s != '\0')
{
step_char(&s, +1, endline);
len++;
}
return (len);
}
/*
* Common part of cmd_step_right() and cmd_step_left().
*/
static char *
cmd_step_common(p, ch, len, pwidth, bswidth)
char *p;
LWCHAR ch;
int len;
int *pwidth;
int *bswidth;
{
char *pr;
if (len == 1)
{
pr = prchar((int) ch);
if (pwidth != NULL || bswidth != NULL)
{
int len = strlen(pr);
if (pwidth != NULL)
*pwidth = len;
if (bswidth != NULL)
*bswidth = len;
}
} else
{
pr = prutfchar(ch);
if (pwidth != NULL || bswidth != NULL)
{
if (is_composing_char(ch))
{
if (pwidth != NULL)
*pwidth = 0;
if (bswidth != NULL)
*bswidth = 0;
} else if (is_ubin_char(ch))
{
int len = strlen(pr);
if (pwidth != NULL)
*pwidth = len;
if (bswidth != NULL)
*bswidth = len;
} else
{
LWCHAR prev_ch = step_char(&p, -1, cmdbuf);
if (is_combining_char(prev_ch, ch))
{
if (pwidth != NULL)
*pwidth = 0;
if (bswidth != NULL)
*bswidth = 0;
} else
{
if (pwidth != NULL)
*pwidth = is_wide_char(ch)
? 2
: 1;
if (bswidth != NULL)
*bswidth = 1;
}
}
}
}
return (pr);
}
/*
* Step a pointer one character right in the command buffer.
*/
static char *
cmd_step_right(pp, pwidth, bswidth)
char **pp;
int *pwidth;
int *bswidth;
{
char *p = *pp;
LWCHAR ch = step_char(pp, +1, p + strlen(p));
return cmd_step_common(p, ch, *pp - p, pwidth, bswidth);
}
/*
* Step a pointer one character left in the command buffer.
*/
static char *
cmd_step_left(pp, pwidth, bswidth)
char **pp;
int *pwidth;
int *bswidth;
{
char *p = *pp;
LWCHAR ch = step_char(pp, -1, cmdbuf);
return cmd_step_common(*pp, ch, p - *pp, pwidth, bswidth);
}
/*
* Repaint the line from cp onwards.
* Then position the cursor just after the char old_cp (a pointer into cmdbuf).
*/
static void
cmd_repaint(old_cp)
char *old_cp;
{
/*
* Repaint the line from the current position.
*/
clear_eol();
while (*cp != '\0')
{
char *np = cp;
int width;
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;
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();
}
/*
* Put the cursor at "home" (just after the prompt),
* and set cp to the corresponding char in cmdbuf.
*/
static void
cmd_home()
{
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];
}
/*
* Shift the cmdbuf display left a half-screen.
*/
static void
cmd_lshift()
{
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 = s - cmdbuf;
save_cp = cp;
cmd_home();
cmd_repaint(save_cp);
}
/*
* Shift the cmdbuf display right a half-screen.
*/
static void
cmd_rshift()
{
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 = s - cmdbuf;
save_cp = cp;
cmd_home();
cmd_repaint(save_cp);
}
/*
* Move cursor right one character.
*/
static int
cmd_right()
{
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()
{
char *ncp;
int width, bswidth;
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(cs, clen)
char *cs;
int 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.
*/
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()
{
register 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 = 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.
*/
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()
{
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()
{
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()
{
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()
{
if (cmdbuf[0] == '\0')
{
/* Buffer is already empty; abort the current command. */
return (CC_QUIT);
}
cmd_offset = 0;
cmd_home();
*cp = '\0';
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(mlist, cmdflags)
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.
*/
static int
cmd_updown(action)
int action;
{
char *s;
if (curr_mlist == NULL)
{
/*
* The current command has no history list.
*/
bell();
return (CC_OK);
}
cmd_home();
clear_eol();
/*
* Move curr_mp to the next/prev entry.
*/
if (action == EC_UP)
curr_mlist->curr_mp = curr_mlist->curr_mp->prev;
else
curr_mlist->curr_mp = curr_mlist->curr_mp->next;
/*
* Copy the entry into cmdbuf and echo it on the screen.
*/
s = curr_mlist->curr_mp->string;
if (s == NULL)
s = "";
strcpy(cmdbuf, s);
for (cp = cmdbuf; *cp != '\0'; )
cmd_right();
return (CC_OK);
}
#endif
/*
* Add a string to a history list.
*/
public void
cmd_addhist(mlist, cmd)
struct mlist *mlist;
char *cmd;
{
#if CMD_HISTORY
struct mlist *ml;
/*
* Don't save a trivial command.
*/
if (strlen(cmd) == 0)
return;
/*
* 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->next = mlist;
ml->prev = mlist->prev;
mlist->prev->next = ml;
mlist->prev = 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()
{
#if CMD_HISTORY
/*
* Nothing to do if there is no currently selected history list.
*/
if (curr_mlist == NULL)
return;
cmd_addhist(curr_mlist, cmdbuf);
curr_mlist->modified = 1;
#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(c)
int c;
{
int action;
int flags;
#if TAB_COMPLETE_FILENAME
#define not_in_completion() in_completion = 0
#else
#define not_in_completion()
#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 |= EC_NOHISTORY;
#endif
#if TAB_COMPLETE_FILENAME
if (curr_mlist == ml_search)
/*
* In a search command; don't accept file-completion cmds.
*/
flags |= EC_NOCOMPLETE;
#endif
action = editchar(c, flags);
switch (action)
{
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
case EC_NOACTION:
return (CC_OK);
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(str)
char *str;
{
char *s;
int action;
char *endline = str + strlen(str);
for (s = str; *s != '\0'; )
{
char *os = s;
step_char(&s, +1, endline);
action = cmd_ichar(os, s - os);
if (action != CC_OK)
{
bell();
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()
{
char *word;
#if SPACES_IN_FILENAMES
char *p;
int delim_quoted = 0;
int meta_quoted = 0;
char *esc = get_meta_escape();
int 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 = 0;
} else if (esclen > 0 && p + esclen < cp &&
strncmp(p, esc, esclen) == 0)
{
meta_quoted = 1;
p += esclen - 1;
} else if (delim_quoted)
{
if (*p == closequote)
delim_quoted = 0;
} else /* (!delim_quoted) */
{
if (*p == openquote)
delim_quoted = 1;
else if (*p == ' ')
word = p+1;
}
}
#endif
return (word);
}
/*
* Set things up to enter completion mode.
* Expand the word under the cursor into a list of filenames
* which start with that word, and set tk_text to that list.
*/
static void
init_compl()
{
char *word;
char c;
/*
* Get rid of any previous tk_text.
*/
if (tk_text != NULL)
{
free(tk_text);
tk_text = NULL;
}
/*
* Find the original (uncompleted) word in the command buffer.
*/
word = delimit_word();
if (word == NULL)
return;
/*
* Set the insertion point to the point in the command buffer
* where the original (uncompleted) word now sits.
*/
tk_ipoint = word;
/*
* Save the original (uncompleted) word
*/
if (tk_original != NULL)
free(tk_original);
tk_original = (char *) ecalloc(cp-word+1, sizeof(char));
strncpy(tk_original, word, cp-word);
/*
* Get the expanded filename.
* This may result in a single filename, or
* a blank-separated list of filenames.
*/
c = *cp;
*cp = '\0';
if (*word != openquote)
{
tk_text = fcomplete(word);
} else
{
char *qword = shell_quote(word+1);
if (qword == NULL)
tk_text = fcomplete(word+1);
else
{
tk_text = fcomplete(qword);
free(qword);
}
}
*cp = c;
}
/*
* Return the next word in the current completion list.
*/
static char *
next_compl(action, prev)
int action;
char *prev;
{
switch (action)
{
case EC_F_COMPLETE:
return (forw_textlist(&tk_tlist, prev));
case EC_B_COMPLETE:
return (back_textlist(&tk_tlist, prev));
}
/* Cannot happen */
return ("?");
}
/*
* Complete the filename before (or under) the cursor.
* cmd_complete may be called multiple times. The global in_completion
* remembers whether this call is the first time (create the list),
* or a subsequent time (step thru the list).
*/
static int
cmd_complete(action)
int action;
{
char *s;
if (!in_completion || action == EC_EXPAND)
{
/*
* Expand the word under the cursor and
* use the first word in the expansion
* (or the entire expansion if we're doing EC_EXPAND).
*/
init_compl();
if (tk_text == NULL)
{
bell();
return (CC_OK);
}
if (action == EC_EXPAND)
{
/*
* Use the whole list.
*/
tk_trial = tk_text;
} else
{
/*
* Use the first filename in the list.
*/
in_completion = 1;
init_textlist(&tk_tlist, tk_text);
tk_trial = next_compl(action, (char*)NULL);
}
} else
{
/*
* We already have a completion list.
* Use the next/previous filename from the list.
*/
tk_trial = next_compl(action, tk_trial);
}
/*
* Remove the original word, or the previous trial completion.
*/
while (cp > tk_ipoint)
(void) cmd_erase();
if (tk_trial == NULL)
{
/*
* There are no more trial completions.
* Insert the original (uncompleted) filename.
*/
in_completion = 0;
if (cmd_istr(tk_original) != CC_OK)
goto fail;
} else
{
/*
* Insert trial completion.
*/
if (cmd_istr(tk_trial) != CC_OK)
goto fail;
/*
* If it is a directory, append a slash.
*/
if (is_dir(tk_trial))
{
if (cp > cmdbuf && cp[-1] == closequote)
(void) cmd_erase();
s = lgetenv("LESSSEPARATOR");
if (s == NULL)
s = PATHNAME_SEP;
if (cmd_istr(s) != CC_OK)
goto fail;
}
}
return (CC_OK);
fail:
in_completion = 0;
bell();
return (CC_OK);
}
#endif /* TAB_COMPLETE_FILENAME */
/*
* Process a single character of a multi-character command, such as
* a number, or the pattern of a search command.
* Returns:
* CC_OK The char was accepted.
* CC_QUIT The char requests the command to be aborted.
* CC_ERROR The char could not be accepted due to an error.
*/
public int
cmd_char(c)
int c;
{
int action;
int len;
if (!utf_mode)
{
cmd_mbc_buf[0] = c;
len = 1;
} else
{
/* Perform strict validation in all possible cases. */
if (cmd_mbc_buf_len == 0)
{
retry:
cmd_mbc_buf_index = 1;
*cmd_mbc_buf = c;
if (IS_ASCII_OCTET(c))
cmd_mbc_buf_len = 1;
else if (IS_UTF8_LEAD(c))
{
cmd_mbc_buf_len = utf_len(c);
return (CC_OK);
} else
{
/* UTF8_INVALID or stray UTF8_TRAIL */
bell();
return (CC_ERROR);
}
} else if (IS_UTF8_TRAIL(c))
{
cmd_mbc_buf[cmd_mbc_buf_index++] = c;
if (cmd_mbc_buf_index < cmd_mbc_buf_len)
return (CC_OK);
if (!is_utf8_well_formed(cmd_mbc_buf))
{
/* complete, but not well formed (non-shortest form), sequence */
cmd_mbc_buf_len = 0;
bell();
return (CC_ERROR);
}
} else
{
/* Flush incomplete (truncated) sequence. */
cmd_mbc_buf_len = 0;
bell();
/* Handle new char. */
goto retry;
}
len = cmd_mbc_buf_len;
cmd_mbc_buf_len = 0;
}
if (literal)
{
/*
* Insert the char, even if it is a line-editing char.
*/
literal = 0;
return (cmd_ichar(cmd_mbc_buf, len));
}
/*
* See if it is a line-editing character.
*/
if (in_mca() && len == 1)
{
action = cmd_edit(c);
switch (action)
{
case CC_OK:
case CC_QUIT:
return (action);
case CC_PASS:
break;
}
}
/*
* Insert the char into the command buffer.
*/
return (cmd_ichar(cmd_mbc_buf, len));
}
/*
* Return the number currently in the command buffer.
*/
public LINENUM
cmd_int(frac)
long *frac;
{
char *p;
LINENUM n = 0;
int err;
for (p = cmdbuf; *p >= '0' && *p <= '9'; p++)
n = (n * 10) + (*p - '0');
*frac = 0;
if (*p++ == '.')
{
*frac = getfraction(&p, NULL, &err);
/* {{ do something if err is set? }} */
}
return (n);
}
/*
* Return a pointer to the command buffer.
*/
public char *
get_cmdbuf()
{
return (cmdbuf);
}
#if CMD_HISTORY
/*
* Return the last (most recent) string in the current command history.
*/
public char *
cmd_lastpattern()
{
if (curr_mlist == NULL)
return (NULL);
return (curr_mlist->curr_mp->prev->string);
}
#endif
#if CMD_HISTORY
/*
* Get the name of the history file.
*/
static char *
histfile_name()
{
char *home;
char *name;
int len;
/* See if filename is explicitly specified by $LESSHISTFILE. */
name = lgetenv("LESSHISTFILE");
if (name != NULL && *name != '\0')
{
if (strcmp(name, "-") == 0 || strcmp(name, "/dev/null") == 0)
/* $LESSHISTFILE == "-" means don't use a history file. */
return (NULL);
return (save(name));
}
/* Otherwise, file is in $HOME. */
home = lgetenv("HOME");
if (home == NULL || *home == '\0')
{
#if OS2
home = lgetenv("INIT");
if (home == NULL || *home == '\0')
#endif
return (NULL);
}
len = strlen(home) + strlen(LESSHISTFILE) + 2;
name = (char *) ecalloc(len, sizeof(char));
SNPRINTF2(name, len, "%s/%s", home, LESSHISTFILE);
return (name);
}
#endif /* CMD_HISTORY */
/*
* Initialize history from a .lesshist file.
*/
public void
init_cmdhist()
{
#if CMD_HISTORY
struct mlist *ml = NULL;
char line[CMDBUF_SIZE];
char *filename;
FILE *f;
char *p;
filename = histfile_name();
if (filename == NULL)
return;
f = fopen(filename, "r");
free(filename);
if (f == NULL)
return;
if (fgets(line, sizeof(line), f) == NULL ||
strncmp(line, HISTFILE_FIRST_LINE, strlen(HISTFILE_FIRST_LINE)) != 0)
{
fclose(f);
return;
}
while (fgets(line, sizeof(line), f) != NULL)
{
for (p = line; *p != '\0'; p++)
{
if (*p == '\n' || *p == '\r')
{
*p = '\0';
break;
}
}
if (strcmp(line, HISTFILE_SEARCH_SECTION) == 0)
ml = &mlist_search;
else if (strcmp(line, HISTFILE_SHELL_SECTION) == 0)
{
#if SHELL_ESCAPE || PIPEC
ml = &mlist_shell;
#else
ml = NULL;
#endif
} else if (*line == '"')
{
if (ml != NULL)
cmd_addhist(ml, line+1);
}
}
fclose(f);
#endif /* CMD_HISTORY */
}
/*
*
*/
#if CMD_HISTORY
static void
save_mlist(ml, f)
struct mlist *ml;
FILE *f;
{
int histsize = 0;
int n;
char *s;
s = lgetenv("LESSHISTSIZE");
if (s != NULL)
histsize = atoi(s);
if (histsize == 0)
histsize = 100;
ml = ml->prev;
for (n = 0; n < histsize; n++)
{
if (ml->string == NULL)
break;
ml = ml->prev;
}
for (ml = ml->next; ml->string != NULL; ml = ml->next)
fprintf(f, "\"%s\n", ml->string);
}
#endif /* CMD_HISTORY */
/*
*
*/
public void
save_cmdhist()
{
#if CMD_HISTORY
char *filename;
FILE *f;
int modified = 0;
filename = histfile_name();
if (filename == NULL)
return;
if (mlist_search.modified)
modified = 1;
#if SHELL_ESCAPE || PIPEC
if (mlist_shell.modified)
modified = 1;
#endif
if (!modified)
return;
f = fopen(filename, "w");
free(filename);
if (f == NULL)
return;
#if HAVE_FCHMOD
{
/* Make history file readable only by owner. */
int do_chmod = 1;
#if HAVE_STAT
struct stat statbuf;
int r = fstat(fileno(f), &statbuf);
if (r < 0 || !S_ISREG(statbuf.st_mode))
/* Don't chmod if not a regular file. */
do_chmod = 0;
#endif
if (do_chmod)
fchmod(fileno(f), 0600);
}
#endif
fprintf(f, "%s\n", HISTFILE_FIRST_LINE);
fprintf(f, "%s\n", HISTFILE_SEARCH_SECTION);
save_mlist(&mlist_search, f);
#if SHELL_ESCAPE || PIPEC
fprintf(f, "%s\n", HISTFILE_SHELL_SECTION);
save_mlist(&mlist_shell, f);
#endif
fclose(f);
#endif /* CMD_HISTORY */
}