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decode.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.
*/
/*
* 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 mousecap;
extern int sc_height;
/* "content" is lesskey source, never binary. */
static void add_content_table(int (*call_lesskey)(constant char *, lbool), constant char *envname, lbool sysvar);
static int add_hometable(int (*call_lesskey)(constant char *, lbool), constant char *envname, constant char *def_filename, lbool sysvar);
#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,
ESC,'[','M',0, A_X11MOUSE_IN,
ESC,'[','<',0, A_X116MOUSE_IN,
' ',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,
ESC,'F',0, A_F_UNTIL_HILITE,
'R',0, A_FREPAINT,
'r',0, A_REPAINT,
CONTROL('R'),0, A_REPAINT,
CONTROL('L'),0, A_REPAINT,
ESC,'u',0, A_UNDO_SEARCH,
ESC,'U',0, A_CLR_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,
ESC,'{',0, A_LLSHIFT,
ESC,'}',0, A_RRSHIFT,
SK(SK_RIGHT_ARROW),0, A_RSHIFT,
SK(SK_LEFT_ARROW),0, A_LSHIFT,
SK(SK_CTL_RIGHT_ARROW),0, A_RRSHIFT,
SK(SK_CTL_LEFT_ARROW),0, A_LLSHIFT,
'{',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,'G',0, A_GOEND_BUF,
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,
'M',0, A_SETMARKBOT,
ESC,'m',0, A_CLRMARK,
'\'',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_PSHELL,
'+',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,SK(SK_BACKSPACE),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 */
ESC,'[','M',0, EC_X11MOUSE, /* X11 mouse report */
ESC,'[','<',0, EC_X116MOUSE, /* X11 1006 mouse report */
};
/*
* Structure to support a list of command tables.
*/
struct tablelist
{
struct tablelist *t_next;
unsigned char *t_start;
unsigned 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(unsigned char *table, size_t len)
{
unsigned char *fm;
unsigned char *to;
int a;
constant char *repl;
size_t 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_* constants),
* 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 || strlen(repl) > klen)
repl = "\377";
while (*repl != '\0')
*to++ = (unsigned char) *repl++; /*{{type-issue}}*/
}
*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;
}
}
}
/*
* Expand special key abbreviations in a list of command tables.
*/
static void expand_cmd_table(struct tablelist *tlist)
{
struct tablelist *t;
for (t = tlist; t != NULL; t = t->t_next)
{
expand_special_keys(t->t_start, ptr_diff(t->t_end, t->t_start));
}
}
/*
* Expand special key abbreviations in all command tables.
*/
public void expand_cmd_tables(void)
{
expand_cmd_table(list_fcmd_tables);
expand_cmd_table(list_ecmd_tables);
expand_cmd_table(list_var_tables);
expand_cmd_table(list_sysvar_tables);
}
/*
* Initialize the command lists.
*/
public void init_cmds(void)
{
/*
* Add the default command tables.
*/
add_fcmd_table(cmdtable, sizeof(cmdtable));
add_ecmd_table(edittable, sizeof(edittable));
#if USERFILE
#ifdef BINDIR /* For backwards compatibility */
/* Try to add tables in the OLD system lesskey file. */
add_hometable(lesskey, NULL, BINDIR "/.sysless", TRUE);
#endif
/*
* Try to load lesskey source file or binary file.
* If the source file succeeds, don't load binary file.
* The binary file is likely to have been generated from
* a (possibly out of date) copy of the src file,
* so loading it is at best redundant.
*/
/*
* Try to add tables in system lesskey src file.
*/
#if HAVE_LESSKEYSRC
if (add_hometable(lesskey_src, "LESSKEYIN_SYSTEM", LESSKEYINFILE_SYS, TRUE) != 0)
#endif
{
/*
* Try to add the tables in the system lesskey binary file.
*/
add_hometable(lesskey, "LESSKEY_SYSTEM", LESSKEYFILE_SYS, TRUE);
}
/*
* Try to add tables in the lesskey src file "$HOME/.lesskey".
*/
#if HAVE_LESSKEYSRC
if (add_hometable(lesskey_src, "LESSKEYIN", DEF_LESSKEYINFILE, FALSE) != 0)
#endif
{
/*
* Try to add the tables in the standard lesskey binary file "$HOME/.less".
*/
add_hometable(lesskey, "LESSKEY", LESSKEYFILE, FALSE);
}
#endif
add_content_table(lesskey_content, "LESSKEY_CONTENT_SYSTEM", TRUE);
add_content_table(lesskey_content, "LESSKEY_CONTENT", FALSE);
}
/*
* Add a command table.
*/
static int add_cmd_table(struct tablelist **tlist, unsigned char *buf, size_t len)
{
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);
}
t->t_start = buf;
t->t_end = buf + len;
t->t_next = NULL;
if (*tlist == NULL)
*tlist = t;
else
{
struct tablelist *e;
for (e = *tlist; e->t_next != NULL; e = e->t_next)
continue;
e->t_next = t;
}
return (0);
}
/*
* Remove the last command table in a list.
*/
static void pop_cmd_table(struct tablelist **tlist)
{
struct tablelist *t;
if (*tlist == NULL)
return;
if ((*tlist)->t_next == NULL)
{
t = *tlist;
*tlist = NULL;
} else
{
struct tablelist *e;
for (e = *tlist; e->t_next->t_next != NULL; e = e->t_next)
continue;
t = e->t_next;
e->t_next = NULL;
}
free(t);
}
/*
* Add a command table.
*/
public void add_fcmd_table(unsigned char *buf, size_t 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(unsigned char *buf, size_t 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(struct tablelist **tlist, unsigned char *buf, size_t len)
{
struct xbuffer xbuf;
xbuf_init(&xbuf);
expand_evars((char*)buf, len, &xbuf); /*{{unsigned-issue}}*/
/* {{ We leak the table in buf. expand_evars scribbled in it so it's useless anyway. }} */
if (add_cmd_table(tlist, xbuf.data, xbuf.end) < 0)
error("Warning: environment variables from lesskey file unavailable", NULL_PARG);
}
/*
* Return action for a mouse wheel down event.
*/
static int mouse_wheel_down(void)
{
return ((mousecap == OPT_ONPLUS) ? A_B_MOUSE : A_F_MOUSE);
}
/*
* Return action for a mouse wheel up event.
*/
static int mouse_wheel_up(void)
{
return ((mousecap == OPT_ONPLUS) ? A_F_MOUSE : A_B_MOUSE);
}
/*
* Return action for the left mouse button trigger.
*/
static int mouse_button_left(int x, int y)
{
(void) x;
/*
* {{ It would be better to return an action and then do this
* in commands() but it's nontrivial to pass y to it. }}
*/
if (y < sc_height-1)
{
setmark('#', y);
screen_trashed();
}
return (A_NOACTION);
}
/*
* Return action for the right mouse button trigger.
*/
static int mouse_button_right(int x, int y)
{
(void) x;
/*
* {{ unlike mouse_button_left, we could return an action,
* but keep it near mouse_button_left for readability. }}
*/
if (y < sc_height-1)
{
gomark('#');
screen_trashed();
}
return (A_NOACTION);
}
/*
* Read a decimal integer. Return the integer and set *pterm to the terminating char.
*/
static int getcc_int(char *pterm)
{
int num = 0;
int digits = 0;
for (;;)
{
char ch = getcc();
if (ch < '0' || ch > '9')
{
if (pterm != NULL) *pterm = ch;
if (digits == 0)
return (-1);
return (num);
}
if (ckd_mul(&num, num, 10) || ckd_add(&num, num, ch - '0'))
return -1;
++digits;
}
}
/*
* Read suffix of mouse input and return the action to take.
* The prefix ("\e[M") has already been read.
*/
static int x11mouse_action(int skip)
{
static int prev_b = X11MOUSE_BUTTON_REL;
int b = getcc() - X11MOUSE_OFFSET;
int x = getcc() - X11MOUSE_OFFSET-1;
int y = getcc() - X11MOUSE_OFFSET-1;
if (skip)
return (A_NOACTION);
switch (b) {
default:
prev_b = b;
return (A_NOACTION);
case X11MOUSE_WHEEL_DOWN:
return mouse_wheel_down();
case X11MOUSE_WHEEL_UP:
return mouse_wheel_up();
case X11MOUSE_BUTTON_REL:
/* to trigger on button-up, we check the last button-down */
switch (prev_b) {
case X11MOUSE_BUTTON1:
return mouse_button_left(x, y);
/* is BUTTON2 the rightmost with 2-buttons mouse? */
case X11MOUSE_BUTTON2:
case X11MOUSE_BUTTON3:
return mouse_button_right(x, y);
}
return (A_NOACTION);
}
}
/*
* Read suffix of mouse input and return the action to take.
* The prefix ("\e[<") has already been read.
*/
static int x116mouse_action(int skip)
{
char ch;
int x, y;
int b = getcc_int(&ch);
if (b < 0 || ch != ';') return (A_NOACTION);
x = getcc_int(&ch) - 1;
if (x < 0 || ch != ';') return (A_NOACTION);
y = getcc_int(&ch) - 1;
if (y < 0) return (A_NOACTION);
if (skip)
return (A_NOACTION);
switch (b) {
case X11MOUSE_WHEEL_DOWN:
return mouse_wheel_down();
case X11MOUSE_WHEEL_UP:
return mouse_wheel_up();
case X11MOUSE_BUTTON1:
if (ch != 'm') return (A_NOACTION);
return mouse_button_left(x, y);
default:
if (ch != 'm') return (A_NOACTION);
/* any other button release */
return mouse_button_right(x, y);
}
}
/*
* Search a single command table for the command string in cmd.
*/
static int cmd_search(constant char *cmd, constant char *table, constant char *endtable, constant char **sp)
{
constant char *p;
constant char *q;
int a = A_INVALID;
*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;
while (*p != '\0')
++p;
a &= ~A_EXTRA;
}
if (a == A_X11MOUSE_IN)
a = x11mouse_action(0);
else if (a == A_X116MOUSE_IN)
a = x116mouse_action(0);
q = cmd-1;
}
} 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;
}
}
return (a);
}
/*
* Decode a command character and return the associated action.
* The "extra" string, if any, is returned in sp.
*/
static int cmd_decode(struct tablelist *tlist, constant char *cmd, constant char **sp)
{
struct tablelist *t;
int action = A_INVALID;
/*
* Search for the cmd thru all the command tables.
* If we find it more than once, take the last one.
*/
*sp = NULL;
for (t = tlist; t != NULL; t = t->t_next)
{
constant char *tsp;
int taction = cmd_search(cmd, (char *) t->t_start, (char *) t->t_end, &tsp);
if (taction == A_UINVALID)
taction = A_INVALID;
if (taction != A_INVALID)
{
action = taction;
*sp = tsp;
}
}
return (action);
}
/*
* Decode a command from the cmdtables list.
*/
public int fcmd_decode(constant char *cmd, constant char **sp)
{
return (cmd_decode(list_fcmd_tables, cmd, sp));
}
/*
* Decode a command from the edittables list.
*/
public int ecmd_decode(constant char *cmd, constant 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 constant char * lgetenv(constant char *var)
{
int a;
constant 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);
}
/*
* Like lgetenv, but also uses a buffer partially filled with an env table.
*/
public constant char * lgetenv_ext(constant char *var, unsigned char *env_buf, size_t env_buf_len)
{
constant char *r;
size_t e;
size_t env_end = 0;
for (e = 0;;)
{
for (; e < env_buf_len; e++)
if (env_buf[e] == '\0')
break;
if (e >= env_buf_len) break;
if (env_buf[++e] & A_EXTRA)
{
for (e = e+1; e < env_buf_len; e++)
if (env_buf[e] == '\0')
break;
}
e++;
if (e >= env_buf_len) break;
env_end = e;
}
/* Temporarily add env_buf to var_tables, do the lookup, then remove it. */
add_var_table(&list_var_tables, env_buf, env_end);
r = lgetenv(var);
pop_cmd_table(&list_var_tables);
return r;
}
/*
* Is a string null or empty?
*/
public int isnullenv(constant char *s)
{
return (s == NULL || *s == '\0');
}
#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 size_t gint(unsigned char **sp)
{
size_t n;
n = *(*sp)++;
n += *(*sp)++ * KRADIX;
return (n);
}
/*
* Process an old (pre-v241) lesskey file.
*/
static int old_lesskey(unsigned char *buf, size_t 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(unsigned char *buf, size_t len, lbool sysvar)
{
unsigned char *p;
unsigned char *end;
int c;
size_t 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;
end = buf + len;
for (;;)
{
c = *p++;
switch (c)
{
case CMD_SECTION:
n = gint(&p);
if (p+n >= end)
return (-1);
add_fcmd_table(p, n);
p += n;
break;
case EDIT_SECTION:
n = gint(&p);
if (p+n >= end)
return (-1);
add_ecmd_table(p, n);
p += n;
break;
case VAR_SECTION:
n = gint(&p);
if (p+n >= end)
return (-1);
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(constant char *filename, lbool sysvar)
{
unsigned char *buf;
POSITION len;
ssize_t n;
int f;
if (!secure_allow(SF_LESSKEY))
return (1);
/*
* Try to open the lesskey file.
*/
f = open(filename, OPEN_READ);
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 = (unsigned char *) calloc((size_t)len, sizeof(char))) == NULL)
{
close(f);
return (-1);
}
if (less_lseek(f, (less_off_t)0, SEEK_SET) == BAD_LSEEK)
{
free(buf);
close(f);
return (-1);
}
n = read(f, buf, (size_t) 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 (len < 4 ||
buf[0] != C0_LESSKEY_MAGIC || buf[1] != C1_LESSKEY_MAGIC ||
buf[2] != C2_LESSKEY_MAGIC || buf[3] != C3_LESSKEY_MAGIC)
return (old_lesskey(buf, (size_t) len));
return (new_lesskey(buf, (size_t) len, sysvar));
}
#if HAVE_LESSKEYSRC
static int lesskey_text(constant char *filename, lbool sysvar, lbool content)
{
static struct lesskey_tables tables;
if (!secure_allow(SF_LESSKEY))
return (1);
int r = content ? parse_lesskey_content(filename, &tables) : parse_lesskey(filename, &tables);
if (r != 0)
return (r);
add_fcmd_table(tables.cmdtable.buf.data, tables.cmdtable.buf.end);
add_ecmd_table(tables.edittable.buf.data, tables.edittable.buf.end);
add_var_table(sysvar ? &list_sysvar_tables : &list_var_tables,
tables.vartable.buf.data, tables.vartable.buf.end);
return (0);
}
public int lesskey_src(constant char *filename, lbool sysvar)
{
return lesskey_text(filename, sysvar, FALSE);
}
public int lesskey_content(constant char *content, lbool sysvar)
{
return lesskey_text(content, sysvar, TRUE);
}
void lesskey_parse_error(char *s)
{
PARG parg;
parg.p_string = s;
error("%s", &parg);
}
#endif /* HAVE_LESSKEYSRC */
/*
* Add a lesskey file.
*/
static int add_hometable(int (*call_lesskey)(constant char *, lbool), constant char *envname, constant char *def_filename, lbool sysvar)
{
char *filename = NULL;
constant char *efilename;
int r;