mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-05 09:14:03 +00:00
842 lines
18 KiB
C
842 lines
18 KiB
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.
|
|
*/
|
|
|
|
|
|
/*
|
|
* Routines to decode user commands.
|
|
*
|
|
* This is all table driven.
|
|
* A command table is a sequence of command descriptors.
|
|
* Each command descriptor is a sequence of bytes with the following format:
|
|
* <c1><c2>...<cN><0><action>
|
|
* The characters c1,c2,...,cN are the command string; that is,
|
|
* the characters which the user must type.
|
|
* It is terminated by a null <0> byte.
|
|
* The byte after the null byte is the action code associated
|
|
* with the command string.
|
|
* If an action byte is OR-ed with A_EXTRA, this indicates
|
|
* that the option byte is followed by an extra string.
|
|
*
|
|
* There may be many command tables.
|
|
* The first (default) table is built-in.
|
|
* Other tables are read in from "lesskey" files.
|
|
* All the tables are linked together and are searched in order.
|
|
*/
|
|
|
|
#include "less.h"
|
|
#include "cmd.h"
|
|
#include "lesskey.h"
|
|
|
|
extern int erase_char, erase2_char, kill_char;
|
|
extern int secure;
|
|
|
|
#define SK(k) \
|
|
SK_SPECIAL_KEY, (k), 6, 1, 1, 1
|
|
/*
|
|
* Command table is ordered roughly according to expected
|
|
* frequency of use, so the common commands are near the beginning.
|
|
*/
|
|
|
|
static unsigned char cmdtable[] =
|
|
{
|
|
'\r',0, A_F_LINE,
|
|
'\n',0, A_F_LINE,
|
|
'e',0, A_F_LINE,
|
|
'j',0, A_F_LINE,
|
|
SK(SK_DOWN_ARROW),0, A_F_LINE,
|
|
CONTROL('E'),0, A_F_LINE,
|
|
CONTROL('N'),0, A_F_LINE,
|
|
'k',0, A_B_LINE,
|
|
'y',0, A_B_LINE,
|
|
CONTROL('Y'),0, A_B_LINE,
|
|
SK(SK_CONTROL_K),0, A_B_LINE,
|
|
CONTROL('P'),0, A_B_LINE,
|
|
SK(SK_UP_ARROW),0, A_B_LINE,
|
|
'J',0, A_FF_LINE,
|
|
'K',0, A_BF_LINE,
|
|
'Y',0, A_BF_LINE,
|
|
'd',0, A_F_SCROLL,
|
|
CONTROL('D'),0, A_F_SCROLL,
|
|
'u',0, A_B_SCROLL,
|
|
CONTROL('U'),0, A_B_SCROLL,
|
|
' ',0, A_F_SCREEN,
|
|
'f',0, A_F_SCREEN,
|
|
CONTROL('F'),0, A_F_SCREEN,
|
|
CONTROL('V'),0, A_F_SCREEN,
|
|
SK(SK_PAGE_DOWN),0, A_F_SCREEN,
|
|
'b',0, A_B_SCREEN,
|
|
CONTROL('B'),0, A_B_SCREEN,
|
|
ESC,'v',0, A_B_SCREEN,
|
|
SK(SK_PAGE_UP),0, A_B_SCREEN,
|
|
'z',0, A_F_WINDOW,
|
|
'w',0, A_B_WINDOW,
|
|
ESC,' ',0, A_FF_SCREEN,
|
|
'F',0, A_F_FOREVER,
|
|
'R',0, A_FREPAINT,
|
|
'r',0, A_REPAINT,
|
|
CONTROL('R'),0, A_REPAINT,
|
|
CONTROL('L'),0, A_REPAINT,
|
|
ESC,'u',0, A_UNDO_SEARCH,
|
|
'g',0, A_GOLINE,
|
|
SK(SK_HOME),0, A_GOLINE,
|
|
'<',0, A_GOLINE,
|
|
ESC,'<',0, A_GOLINE,
|
|
'p',0, A_PERCENT,
|
|
'%',0, A_PERCENT,
|
|
ESC,'[',0, A_LSHIFT,
|
|
ESC,']',0, A_RSHIFT,
|
|
ESC,'(',0, A_LSHIFT,
|
|
ESC,')',0, A_RSHIFT,
|
|
SK(SK_RIGHT_ARROW),0, A_RSHIFT,
|
|
SK(SK_LEFT_ARROW),0, A_LSHIFT,
|
|
'{',0, A_F_BRACKET|A_EXTRA, '{','}',0,
|
|
'}',0, A_B_BRACKET|A_EXTRA, '{','}',0,
|
|
'(',0, A_F_BRACKET|A_EXTRA, '(',')',0,
|
|
')',0, A_B_BRACKET|A_EXTRA, '(',')',0,
|
|
'[',0, A_F_BRACKET|A_EXTRA, '[',']',0,
|
|
']',0, A_B_BRACKET|A_EXTRA, '[',']',0,
|
|
ESC,CONTROL('F'),0, A_F_BRACKET,
|
|
ESC,CONTROL('B'),0, A_B_BRACKET,
|
|
'G',0, A_GOEND,
|
|
ESC,'>',0, A_GOEND,
|
|
'>',0, A_GOEND,
|
|
SK(SK_END),0, A_GOEND,
|
|
'P',0, A_GOPOS,
|
|
|
|
'0',0, A_DIGIT,
|
|
'1',0, A_DIGIT,
|
|
'2',0, A_DIGIT,
|
|
'3',0, A_DIGIT,
|
|
'4',0, A_DIGIT,
|
|
'5',0, A_DIGIT,
|
|
'6',0, A_DIGIT,
|
|
'7',0, A_DIGIT,
|
|
'8',0, A_DIGIT,
|
|
'9',0, A_DIGIT,
|
|
'.',0, A_DIGIT,
|
|
|
|
'=',0, A_STAT,
|
|
CONTROL('G'),0, A_STAT,
|
|
':','f',0, A_STAT,
|
|
'/',0, A_F_SEARCH,
|
|
'?',0, A_B_SEARCH,
|
|
ESC,'/',0, A_F_SEARCH|A_EXTRA, '*',0,
|
|
ESC,'?',0, A_B_SEARCH|A_EXTRA, '*',0,
|
|
'n',0, A_AGAIN_SEARCH,
|
|
ESC,'n',0, A_T_AGAIN_SEARCH,
|
|
'N',0, A_REVERSE_SEARCH,
|
|
ESC,'N',0, A_T_REVERSE_SEARCH,
|
|
'&',0, A_FILTER,
|
|
'm',0, A_SETMARK,
|
|
'\'',0, A_GOMARK,
|
|
CONTROL('X'),CONTROL('X'),0, A_GOMARK,
|
|
'E',0, A_EXAMINE,
|
|
':','e',0, A_EXAMINE,
|
|
CONTROL('X'),CONTROL('V'),0, A_EXAMINE,
|
|
':','n',0, A_NEXT_FILE,
|
|
':','p',0, A_PREV_FILE,
|
|
't',0, A_NEXT_TAG,
|
|
'T',0, A_PREV_TAG,
|
|
':','x',0, A_INDEX_FILE,
|
|
':','d',0, A_REMOVE_FILE,
|
|
'-',0, A_OPT_TOGGLE,
|
|
':','t',0, A_OPT_TOGGLE|A_EXTRA, 't',0,
|
|
's',0, A_OPT_TOGGLE|A_EXTRA, 'o',0,
|
|
'_',0, A_DISP_OPTION,
|
|
'|',0, A_PIPE,
|
|
'v',0, A_VISUAL,
|
|
'!',0, A_SHELL,
|
|
'+',0, A_FIRSTCMD,
|
|
|
|
'H',0, A_HELP,
|
|
'h',0, A_HELP,
|
|
SK(SK_F1),0, A_HELP,
|
|
'V',0, A_VERSION,
|
|
'q',0, A_QUIT,
|
|
'Q',0, A_QUIT,
|
|
':','q',0, A_QUIT,
|
|
':','Q',0, A_QUIT,
|
|
'Z','Z',0, A_QUIT
|
|
};
|
|
|
|
static unsigned char edittable[] =
|
|
{
|
|
'\t',0, EC_F_COMPLETE, /* TAB */
|
|
'\17',0, EC_B_COMPLETE, /* BACKTAB */
|
|
SK(SK_BACKTAB),0, EC_B_COMPLETE, /* BACKTAB */
|
|
ESC,'\t',0, EC_B_COMPLETE, /* ESC TAB */
|
|
CONTROL('L'),0, EC_EXPAND, /* CTRL-L */
|
|
CONTROL('V'),0, EC_LITERAL, /* BACKSLASH */
|
|
CONTROL('A'),0, EC_LITERAL, /* BACKSLASH */
|
|
ESC,'l',0, EC_RIGHT, /* ESC l */
|
|
SK(SK_RIGHT_ARROW),0, EC_RIGHT, /* RIGHTARROW */
|
|
ESC,'h',0, EC_LEFT, /* ESC h */
|
|
SK(SK_LEFT_ARROW),0, EC_LEFT, /* LEFTARROW */
|
|
ESC,'b',0, EC_W_LEFT, /* ESC b */
|
|
ESC,SK(SK_LEFT_ARROW),0, EC_W_LEFT, /* ESC LEFTARROW */
|
|
SK(SK_CTL_LEFT_ARROW),0, EC_W_LEFT, /* CTRL-LEFTARROW */
|
|
ESC,'w',0, EC_W_RIGHT, /* ESC w */
|
|
ESC,SK(SK_RIGHT_ARROW),0, EC_W_RIGHT, /* ESC RIGHTARROW */
|
|
SK(SK_CTL_RIGHT_ARROW),0, EC_W_RIGHT, /* CTRL-RIGHTARROW */
|
|
ESC,'i',0, EC_INSERT, /* ESC i */
|
|
SK(SK_INSERT),0, EC_INSERT, /* INSERT */
|
|
ESC,'x',0, EC_DELETE, /* ESC x */
|
|
SK(SK_DELETE),0, EC_DELETE, /* DELETE */
|
|
ESC,'X',0, EC_W_DELETE, /* ESC X */
|
|
ESC,SK(SK_DELETE),0, EC_W_DELETE, /* ESC DELETE */
|
|
SK(SK_CTL_DELETE),0, EC_W_DELETE, /* CTRL-DELETE */
|
|
SK(SK_CTL_BACKSPACE),0, EC_W_BACKSPACE, /* CTRL-BACKSPACE */
|
|
ESC,'\b',0, EC_W_BACKSPACE, /* ESC BACKSPACE */
|
|
ESC,'0',0, EC_HOME, /* ESC 0 */
|
|
SK(SK_HOME),0, EC_HOME, /* HOME */
|
|
ESC,'$',0, EC_END, /* ESC $ */
|
|
SK(SK_END),0, EC_END, /* END */
|
|
ESC,'k',0, EC_UP, /* ESC k */
|
|
SK(SK_UP_ARROW),0, EC_UP, /* UPARROW */
|
|
ESC,'j',0, EC_DOWN, /* ESC j */
|
|
SK(SK_DOWN_ARROW),0, EC_DOWN, /* DOWNARROW */
|
|
CONTROL('G'),0, EC_ABORT, /* CTRL-G */
|
|
};
|
|
|
|
/*
|
|
* Structure to support a list of command tables.
|
|
*/
|
|
struct tablelist
|
|
{
|
|
struct tablelist *t_next;
|
|
char *t_start;
|
|
char *t_end;
|
|
};
|
|
|
|
/*
|
|
* List of command tables and list of line-edit tables.
|
|
*/
|
|
static struct tablelist *list_fcmd_tables = NULL;
|
|
static struct tablelist *list_ecmd_tables = NULL;
|
|
static struct tablelist *list_var_tables = NULL;
|
|
static struct tablelist *list_sysvar_tables = NULL;
|
|
|
|
|
|
/*
|
|
* Expand special key abbreviations in a command table.
|
|
*/
|
|
static void
|
|
expand_special_keys(table, len)
|
|
char *table;
|
|
int len;
|
|
{
|
|
register char *fm;
|
|
register char *to;
|
|
register int a;
|
|
char *repl;
|
|
int klen;
|
|
|
|
for (fm = table; fm < table + len; )
|
|
{
|
|
/*
|
|
* Rewrite each command in the table with any
|
|
* special key abbreviations expanded.
|
|
*/
|
|
for (to = fm; *fm != '\0'; )
|
|
{
|
|
if (*fm != SK_SPECIAL_KEY)
|
|
{
|
|
*to++ = *fm++;
|
|
continue;
|
|
}
|
|
/*
|
|
* After SK_SPECIAL_KEY, next byte is the type
|
|
* of special key (one of the SK_* contants),
|
|
* and the byte after that is the number of bytes,
|
|
* N, reserved by the abbreviation (including the
|
|
* SK_SPECIAL_KEY and key type bytes).
|
|
* Replace all N bytes with the actual bytes
|
|
* output by the special key on this terminal.
|
|
*/
|
|
repl = special_key_str(fm[1]);
|
|
klen = fm[2] & 0377;
|
|
fm += klen;
|
|
if (repl == NULL || (int) strlen(repl) > klen)
|
|
repl = "\377";
|
|
while (*repl != '\0')
|
|
*to++ = *repl++;
|
|
}
|
|
*to++ = '\0';
|
|
/*
|
|
* Fill any unused bytes between end of command and
|
|
* the action byte with A_SKIP.
|
|
*/
|
|
while (to <= fm)
|
|
*to++ = A_SKIP;
|
|
fm++;
|
|
a = *fm++ & 0377;
|
|
if (a & A_EXTRA)
|
|
{
|
|
while (*fm++ != '\0')
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialize the command lists.
|
|
*/
|
|
public void
|
|
init_cmds()
|
|
{
|
|
/*
|
|
* Add the default command tables.
|
|
*/
|
|
add_fcmd_table((char*)cmdtable, sizeof(cmdtable));
|
|
add_ecmd_table((char*)edittable, sizeof(edittable));
|
|
#if USERFILE
|
|
/*
|
|
* For backwards compatibility,
|
|
* try to add tables in the OLD system lesskey file.
|
|
*/
|
|
#ifdef BINDIR
|
|
add_hometable(NULL, BINDIR "/.sysless", 1);
|
|
#endif
|
|
/*
|
|
* Try to add the tables in the system lesskey file.
|
|
*/
|
|
add_hometable("LESSKEY_SYSTEM", LESSKEYFILE_SYS, 1);
|
|
/*
|
|
* Try to add the tables in the standard lesskey file "$HOME/.less".
|
|
*/
|
|
add_hometable("LESSKEY", LESSKEYFILE, 0);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Add a command table.
|
|
*/
|
|
static int
|
|
add_cmd_table(tlist, buf, len)
|
|
struct tablelist **tlist;
|
|
char *buf;
|
|
int len;
|
|
{
|
|
register struct tablelist *t;
|
|
|
|
if (len == 0)
|
|
return (0);
|
|
/*
|
|
* Allocate a tablelist structure, initialize it,
|
|
* and link it into the list of tables.
|
|
*/
|
|
if ((t = (struct tablelist *)
|
|
calloc(1, sizeof(struct tablelist))) == NULL)
|
|
{
|
|
return (-1);
|
|
}
|
|
expand_special_keys(buf, len);
|
|
t->t_start = buf;
|
|
t->t_end = buf + len;
|
|
t->t_next = *tlist;
|
|
*tlist = t;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Add a command table.
|
|
*/
|
|
public void
|
|
add_fcmd_table(buf, len)
|
|
char *buf;
|
|
int len;
|
|
{
|
|
if (add_cmd_table(&list_fcmd_tables, buf, len) < 0)
|
|
error("Warning: some commands disabled", NULL_PARG);
|
|
}
|
|
|
|
/*
|
|
* Add an editing command table.
|
|
*/
|
|
public void
|
|
add_ecmd_table(buf, len)
|
|
char *buf;
|
|
int len;
|
|
{
|
|
if (add_cmd_table(&list_ecmd_tables, buf, len) < 0)
|
|
error("Warning: some edit commands disabled", NULL_PARG);
|
|
}
|
|
|
|
/*
|
|
* Add an environment variable table.
|
|
*/
|
|
static void
|
|
add_var_table(tlist, buf, len)
|
|
struct tablelist **tlist;
|
|
char *buf;
|
|
int len;
|
|
{
|
|
if (add_cmd_table(tlist, buf, len) < 0)
|
|
error("Warning: environment variables from lesskey file unavailable", NULL_PARG);
|
|
}
|
|
|
|
/*
|
|
* Search a single command table for the command string in cmd.
|
|
*/
|
|
static int
|
|
cmd_search(cmd, table, endtable, sp)
|
|
char *cmd;
|
|
char *table;
|
|
char *endtable;
|
|
char **sp;
|
|
{
|
|
register char *p;
|
|
register char *q;
|
|
register int a;
|
|
|
|
*sp = NULL;
|
|
for (p = table, q = cmd; p < endtable; p++, q++)
|
|
{
|
|
if (*p == *q)
|
|
{
|
|
/*
|
|
* Current characters match.
|
|
* If we're at the end of the string, we've found it.
|
|
* Return the action code, which is the character
|
|
* after the null at the end of the string
|
|
* in the command table.
|
|
*/
|
|
if (*p == '\0')
|
|
{
|
|
a = *++p & 0377;
|
|
while (a == A_SKIP)
|
|
a = *++p & 0377;
|
|
if (a == A_END_LIST)
|
|
{
|
|
/*
|
|
* We get here only if the original
|
|
* cmd string passed in was empty ("").
|
|
* I don't think that can happen,
|
|
* but just in case ...
|
|
*/
|
|
return (A_UINVALID);
|
|
}
|
|
/*
|
|
* Check for an "extra" string.
|
|
*/
|
|
if (a & A_EXTRA)
|
|
{
|
|
*sp = ++p;
|
|
a &= ~A_EXTRA;
|
|
}
|
|
return (a);
|
|
}
|
|
} else if (*q == '\0')
|
|
{
|
|
/*
|
|
* Hit the end of the user's command,
|
|
* but not the end of the string in the command table.
|
|
* The user's command is incomplete.
|
|
*/
|
|
return (A_PREFIX);
|
|
} else
|
|
{
|
|
/*
|
|
* Not a match.
|
|
* Skip ahead to the next command in the
|
|
* command table, and reset the pointer
|
|
* to the beginning of the user's command.
|
|
*/
|
|
if (*p == '\0' && p[1] == A_END_LIST)
|
|
{
|
|
/*
|
|
* A_END_LIST is a special marker that tells
|
|
* us to abort the cmd search.
|
|
*/
|
|
return (A_UINVALID);
|
|
}
|
|
while (*p++ != '\0')
|
|
continue;
|
|
while (*p == A_SKIP)
|
|
p++;
|
|
if (*p & A_EXTRA)
|
|
while (*++p != '\0')
|
|
continue;
|
|
q = cmd-1;
|
|
}
|
|
}
|
|
/*
|
|
* No match found in the entire command table.
|
|
*/
|
|
return (A_INVALID);
|
|
}
|
|
|
|
/*
|
|
* Decode a command character and return the associated action.
|
|
* The "extra" string, if any, is returned in sp.
|
|
*/
|
|
static int
|
|
cmd_decode(tlist, cmd, sp)
|
|
struct tablelist *tlist;
|
|
char *cmd;
|
|
char **sp;
|
|
{
|
|
register struct tablelist *t;
|
|
register int action = A_INVALID;
|
|
|
|
/*
|
|
* Search thru all the command tables.
|
|
* Stop when we find an action which is not A_INVALID.
|
|
*/
|
|
for (t = tlist; t != NULL; t = t->t_next)
|
|
{
|
|
action = cmd_search(cmd, t->t_start, t->t_end, sp);
|
|
if (action != A_INVALID)
|
|
break;
|
|
}
|
|
if (action == A_UINVALID)
|
|
action = A_INVALID;
|
|
return (action);
|
|
}
|
|
|
|
/*
|
|
* Decode a command from the cmdtables list.
|
|
*/
|
|
public int
|
|
fcmd_decode(cmd, sp)
|
|
char *cmd;
|
|
char **sp;
|
|
{
|
|
return (cmd_decode(list_fcmd_tables, cmd, sp));
|
|
}
|
|
|
|
/*
|
|
* Decode a command from the edittables list.
|
|
*/
|
|
public int
|
|
ecmd_decode(cmd, sp)
|
|
char *cmd;
|
|
char **sp;
|
|
{
|
|
return (cmd_decode(list_ecmd_tables, cmd, sp));
|
|
}
|
|
|
|
/*
|
|
* Get the value of an environment variable.
|
|
* Looks first in the lesskey file, then in the real environment.
|
|
*/
|
|
public char *
|
|
lgetenv(var)
|
|
char *var;
|
|
{
|
|
int a;
|
|
char *s;
|
|
|
|
a = cmd_decode(list_var_tables, var, &s);
|
|
if (a == EV_OK)
|
|
return (s);
|
|
s = getenv(var);
|
|
if (s != NULL && *s != '\0')
|
|
return (s);
|
|
a = cmd_decode(list_sysvar_tables, var, &s);
|
|
if (a == EV_OK)
|
|
return (s);
|
|
return (NULL);
|
|
}
|
|
|
|
#if USERFILE
|
|
/*
|
|
* Get an "integer" from a lesskey file.
|
|
* Integers are stored in a funny format:
|
|
* two bytes, low order first, in radix KRADIX.
|
|
*/
|
|
static int
|
|
gint(sp)
|
|
char **sp;
|
|
{
|
|
int n;
|
|
|
|
n = *(*sp)++;
|
|
n += *(*sp)++ * KRADIX;
|
|
return (n);
|
|
}
|
|
|
|
/*
|
|
* Process an old (pre-v241) lesskey file.
|
|
*/
|
|
static int
|
|
old_lesskey(buf, len)
|
|
char *buf;
|
|
int len;
|
|
{
|
|
/*
|
|
* Old-style lesskey file.
|
|
* The file must end with either
|
|
* ...,cmd,0,action
|
|
* or ...,cmd,0,action|A_EXTRA,string,0
|
|
* So the last byte or the second to last byte must be zero.
|
|
*/
|
|
if (buf[len-1] != '\0' && buf[len-2] != '\0')
|
|
return (-1);
|
|
add_fcmd_table(buf, len);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Process a new (post-v241) lesskey file.
|
|
*/
|
|
static int
|
|
new_lesskey(buf, len, sysvar)
|
|
char *buf;
|
|
int len;
|
|
int sysvar;
|
|
{
|
|
char *p;
|
|
register int c;
|
|
register int n;
|
|
|
|
/*
|
|
* New-style lesskey file.
|
|
* Extract the pieces.
|
|
*/
|
|
if (buf[len-3] != C0_END_LESSKEY_MAGIC ||
|
|
buf[len-2] != C1_END_LESSKEY_MAGIC ||
|
|
buf[len-1] != C2_END_LESSKEY_MAGIC)
|
|
return (-1);
|
|
p = buf + 4;
|
|
for (;;)
|
|
{
|
|
c = *p++;
|
|
switch (c)
|
|
{
|
|
case CMD_SECTION:
|
|
n = gint(&p);
|
|
add_fcmd_table(p, n);
|
|
p += n;
|
|
break;
|
|
case EDIT_SECTION:
|
|
n = gint(&p);
|
|
add_ecmd_table(p, n);
|
|
p += n;
|
|
break;
|
|
case VAR_SECTION:
|
|
n = gint(&p);
|
|
add_var_table((sysvar) ?
|
|
&list_sysvar_tables : &list_var_tables, p, n);
|
|
p += n;
|
|
break;
|
|
case END_SECTION:
|
|
return (0);
|
|
default:
|
|
/*
|
|
* Unrecognized section type.
|
|
*/
|
|
return (-1);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set up a user command table, based on a "lesskey" file.
|
|
*/
|
|
public int
|
|
lesskey(filename, sysvar)
|
|
char *filename;
|
|
int sysvar;
|
|
{
|
|
register char *buf;
|
|
register POSITION len;
|
|
register long n;
|
|
register int f;
|
|
|
|
if (secure)
|
|
return (1);
|
|
/*
|
|
* Try to open the lesskey file.
|
|
*/
|
|
filename = shell_unquote(filename);
|
|
f = open(filename, OPEN_READ);
|
|
free(filename);
|
|
if (f < 0)
|
|
return (1);
|
|
|
|
/*
|
|
* Read the file into a buffer.
|
|
* We first figure out the size of the file and allocate space for it.
|
|
* {{ Minimal error checking is done here.
|
|
* A garbage .less file will produce strange results.
|
|
* To avoid a large amount of error checking code here, we
|
|
* rely on the lesskey program to generate a good .less file. }}
|
|
*/
|
|
len = filesize(f);
|
|
if (len == NULL_POSITION || len < 3)
|
|
{
|
|
/*
|
|
* Bad file (valid file must have at least 3 chars).
|
|
*/
|
|
close(f);
|
|
return (-1);
|
|
}
|
|
if ((buf = (char *) calloc((int)len, sizeof(char))) == NULL)
|
|
{
|
|
close(f);
|
|
return (-1);
|
|
}
|
|
if (lseek(f, (off_t)0, SEEK_SET) == BAD_LSEEK)
|
|
{
|
|
free(buf);
|
|
close(f);
|
|
return (-1);
|
|
}
|
|
n = read(f, buf, (unsigned int) len);
|
|
close(f);
|
|
if (n != len)
|
|
{
|
|
free(buf);
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Figure out if this is an old-style (before version 241)
|
|
* or new-style lesskey file format.
|
|
*/
|
|
if (buf[0] != C0_LESSKEY_MAGIC || buf[1] != C1_LESSKEY_MAGIC ||
|
|
buf[2] != C2_LESSKEY_MAGIC || buf[3] != C3_LESSKEY_MAGIC)
|
|
return (old_lesskey(buf, (int)len));
|
|
return (new_lesskey(buf, (int)len, sysvar));
|
|
}
|
|
|
|
/*
|
|
* Add the standard lesskey file "$HOME/.less"
|
|
*/
|
|
public void
|
|
add_hometable(envname, def_filename, sysvar)
|
|
char *envname;
|
|
char *def_filename;
|
|
int sysvar;
|
|
{
|
|
char *filename;
|
|
PARG parg;
|
|
|
|
if (envname != NULL && (filename = lgetenv(envname)) != NULL)
|
|
filename = save(filename);
|
|
else if (sysvar)
|
|
filename = save(def_filename);
|
|
else
|
|
filename = homefile(def_filename);
|
|
if (filename == NULL)
|
|
return;
|
|
if (lesskey(filename, sysvar) < 0)
|
|
{
|
|
parg.p_string = filename;
|
|
error("Cannot use lesskey file \"%s\"", &parg);
|
|
}
|
|
free(filename);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* See if a char is a special line-editing command.
|
|
*/
|
|
public int
|
|
editchar(c, flags)
|
|
int c;
|
|
int flags;
|
|
{
|
|
int action;
|
|
int nch;
|
|
char *s;
|
|
char usercmd[MAX_CMDLEN+1];
|
|
|
|
/*
|
|
* An editing character could actually be a sequence of characters;
|
|
* for example, an escape sequence sent by pressing the uparrow key.
|
|
* To match the editing string, we use the command decoder
|
|
* but give it the edit-commands command table
|
|
* This table is constructed to match the user's keyboard.
|
|
*/
|
|
if (c == erase_char || c == erase2_char)
|
|
return (EC_BACKSPACE);
|
|
if (c == kill_char)
|
|
return (EC_LINEKILL);
|
|
|
|
/*
|
|
* Collect characters in a buffer.
|
|
* Start with the one we have, and get more if we need them.
|
|
*/
|
|
nch = 0;
|
|
do {
|
|
if (nch > 0)
|
|
c = getcc();
|
|
usercmd[nch] = c;
|
|
usercmd[nch+1] = '\0';
|
|
nch++;
|
|
action = ecmd_decode(usercmd, &s);
|
|
} while (action == A_PREFIX);
|
|
|
|
if (flags & EC_NORIGHTLEFT)
|
|
{
|
|
switch (action)
|
|
{
|
|
case EC_RIGHT:
|
|
case EC_LEFT:
|
|
action = A_INVALID;
|
|
break;
|
|
}
|
|
}
|
|
#if CMD_HISTORY
|
|
if (flags & EC_NOHISTORY)
|
|
{
|
|
/*
|
|
* The caller says there is no history list.
|
|
* Reject any history-manipulation action.
|
|
*/
|
|
switch (action)
|
|
{
|
|
case EC_UP:
|
|
case EC_DOWN:
|
|
action = A_INVALID;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
#if TAB_COMPLETE_FILENAME
|
|
if (flags & EC_NOCOMPLETE)
|
|
{
|
|
/*
|
|
* The caller says we don't want any filename completion cmds.
|
|
* Reject them.
|
|
*/
|
|
switch (action)
|
|
{
|
|
case EC_F_COMPLETE:
|
|
case EC_B_COMPLETE:
|
|
case EC_EXPAND:
|
|
action = A_INVALID;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
if ((flags & EC_PEEK) || action == A_INVALID)
|
|
{
|
|
/*
|
|
* We're just peeking, or we didn't understand the command.
|
|
* Unget all the characters we read in the loop above.
|
|
* This does NOT include the original character that was
|
|
* passed in as a parameter.
|
|
*/
|
|
while (nch > 1)
|
|
{
|
|
ungetcc(usercmd[--nch]);
|
|
}
|
|
} else
|
|
{
|
|
if (s != NULL)
|
|
ungetsc(s);
|
|
}
|
|
return action;
|
|
}
|
|
|