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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/less/less/../decode.c	Lines:	117	201	58.2 %
Date:	2017-11-13	Branches:	74	149	49.7 %


/*
 * Copyright (C) 1984-2012  Mark Nudelman
 * Modified for use with illumos by Garrett D'Amore.
 * Copyright 2014 Garrett D'Amore <garrett@damore.org>
 *
 * 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 "cmd.h"
#include "less.h"
#include "lesskey.h"

extern int erase_char, erase2_char, kill_char;
extern int secure, less_is_more;

#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,
	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,
	'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,
	':', 't', 0,			A_OPT_TOGGLE|A_EXTRA,	't', 0,
	'|', 0,				A_PIPE,
	'v', 0,				A_VISUAL,
	'+', 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 lesstable[] = {
	'-', 0,				A_OPT_TOGGLE,
	's', 0,				A_OPT_TOGGLE|A_EXTRA,	'o', 0,
	'_', 0,				A_DISP_OPTION
};

static unsigned char moretable[] = {
	's', 0,				A_F_SKIP
};

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(char *table, int len)
{
	char *fm;
	char *to;
	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 || 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.
 */
void
init_cmds(void)
{
	/*
	 * Add the default command tables.
	 */
	add_fcmd_table((char *)cmdtable, sizeof (cmdtable));
	add_ecmd_table((char *)edittable, sizeof (edittable));
	if (less_is_more) {
		add_fcmd_table((char *)moretable, sizeof (moretable));
		return;
	} else {
		add_fcmd_table((char *)lesstable, sizeof (lesstable));
	}

	/*
	 * 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);
}

/*
 * Add a command table.
 */
static int
add_cmd_table(struct tablelist **tlist, char *buf, int 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 = 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.
 */
void
add_fcmd_table(char *buf, int len)
{
	if (add_cmd_table(&list_fcmd_tables, buf, len) < 0)
		error("Warning: some commands disabled", NULL);
}

/*
 * Add an editing command table.
 */
void
add_ecmd_table(char *buf, int len)
{
	if (add_cmd_table(&list_ecmd_tables, buf, len) < 0)
		error("Warning: some edit commands disabled", NULL);
}

/*
 * Add an environment variable table.
 */
static void
add_var_table(struct tablelist **tlist, char *buf, int len)
{
	if (add_cmd_table(tlist, buf, len) < 0)
		error("Warning: environment variables from "
		    "lesskey file unavailable", NULL);
}

/*
 * Search a single command table for the command string in cmd.
 */
static int
cmd_search(const char *cmd, char *table, char *endtable, char **sp)
{
	char *p;
	const char *q;
	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(struct tablelist *tlist, const char *cmd, char **sp)
{
	struct tablelist *t;
	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.
 */
int
fcmd_decode(const char *cmd, char **sp)
{
	return (cmd_decode(list_fcmd_tables, cmd, sp));
}

/*
 * Decode a command from the edittables list.
 */
int
ecmd_decode(const 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.
 */
char *
lgetenv(char *var)
{
	int a;
	char *s;

	/*
	 * Ignore lookups of any LESS* setting when we are more, and ignore
	 * the less key files
	 */
	if (less_is_more) {
		if (strncmp(var, "LESS", 4) == 0) {
			return (NULL);
		}
		return (getenv(var));
	}
	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);
}

/*
 * 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(char **sp)
{
	int n;

	n = *(*sp)++;
	n += *(*sp)++ * KRADIX;
	return (n);
}

/*
 * Process an old (pre-v241) lesskey file.
 */
static int
old_lesskey(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(char *buf, int len, int sysvar)
{
	char *p;
	int c;
	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.
 */
int
lesskey(char *filename, int sysvar)
{
	char *buf;
	off_t len;
	long n;
	int f;

	if (secure)
		return (1);
	/*
	 * Try to open the lesskey file.
	 */
	filename = shell_unquote(filename);
	f = open(filename, O_RDONLY);
	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 == -1 || len < 3) {
		/*
		 * Bad file (valid file must have at least 3 chars).
		 */
		(void) close(f);
		return (-1);
	}
	if ((buf = calloc((int)len, sizeof (char))) == NULL) {
		(void) close(f);
		return (-1);
	}
	if (lseek(f, (off_t)0, SEEK_SET) == (off_t)-1) {
		free(buf);
		(void) 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"
 */
void
add_hometable(char *envname, char *def_filename, int sysvar)
{
	char *filename;
	PARG parg;

	if (envname != NULL && (filename = lgetenv(envname)) != NULL)
		filename = estrdup(filename);
	else if (sysvar)
		filename = estrdup(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);
}

/*
 * See if a char is a special line-editing command.
 */
int
editchar(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] = (char)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 (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;
		}
	}
	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;
		}
	}
	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);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/*
2			* Copyright (C) 1984-2012 Mark Nudelman
3			* Modified for use with illumos by Garrett D'Amore.
4			* Copyright 2014 Garrett D'Amore <garrett@damore.org>
5			*
6			* You may distribute under the terms of either the GNU General Public
7			* License or the Less License, as specified in the README file.
8			*
9			* For more information, see the README file.
10			*/
11
12			/*
13			* Routines to decode user commands.
14			*
15			* This is all table driven.
16			* A command table is a sequence of command descriptors.
17			* Each command descriptor is a sequence of bytes with the following format:
18			* <c1><c2>...<cN><0><action>
19			* The characters c1,c2,...,cN are the command string; that is,
20			* the characters which the user must type.
21			* It is terminated by a null <0> byte.
22			* The byte after the null byte is the action code associated
23			* with the command string.
24			* If an action byte is OR-ed with A_EXTRA, this indicates
25			* that the option byte is followed by an extra string.
26			*
27			* There may be many command tables.
28			* The first (default) table is built-in.
29			* Other tables are read in from "lesskey" files.
30			* All the tables are linked together and are searched in order.
31			*/
32
33			#include "cmd.h"
34			#include "less.h"
35			#include "lesskey.h"
36
37			extern int erase_char, erase2_char, kill_char;
38			extern int secure, less_is_more;
39
40			#define SK(k) \
41			SK_SPECIAL_KEY, (k), 6, 1, 1, 1
42			/*
43			* Command table is ordered roughly according to expected
44			* frequency of use, so the common commands are near the beginning.
45			*/
46
47			static unsigned char cmdtable[] =
48			{
49			'\r', 0, A_F_LINE,
50			'\n', 0, A_F_LINE,
51			'e', 0, A_F_LINE,
52			'j', 0, A_F_LINE,
53			SK(SK_DOWN_ARROW), 0, A_F_LINE,
54			CONTROL('E'), 0, A_F_LINE,
55			CONTROL('N'), 0, A_F_LINE,
56			'k', 0, A_B_LINE,
57			'y', 0, A_B_LINE,
58			CONTROL('Y'), 0, A_B_LINE,
59			SK(SK_CONTROL_K), 0, A_B_LINE,
60			CONTROL('P'), 0, A_B_LINE,
61			SK(SK_UP_ARROW), 0, A_B_LINE,
62			'J', 0, A_FF_LINE,
63			'K', 0, A_BF_LINE,
64			'Y', 0, A_BF_LINE,
65			'd', 0, A_F_SCROLL,
66			CONTROL('D'), 0, A_F_SCROLL,
67			'u', 0, A_B_SCROLL,
68			CONTROL('U'), 0, A_B_SCROLL,
69			' ', 0, A_F_SCREEN,
70			'f', 0, A_F_SCREEN,
71			CONTROL('F'), 0, A_F_SCREEN,
72			CONTROL('V'), 0, A_F_SCREEN,
73			SK(SK_PAGE_DOWN), 0, A_F_SCREEN,
74			'b', 0, A_B_SCREEN,
75			CONTROL('B'), 0, A_B_SCREEN,
76			ESC, 'v', 0, A_B_SCREEN,
77			SK(SK_PAGE_UP), 0, A_B_SCREEN,
78			'z', 0, A_F_WINDOW,
79			'w', 0, A_B_WINDOW,
80			ESC, ' ', 0, A_FF_SCREEN,
81			'F', 0, A_F_FOREVER,
82			ESC, 'F', 0, A_F_UNTIL_HILITE,
83			'R', 0, A_FREPAINT,
84			'r', 0, A_REPAINT,
85			CONTROL('R'), 0, A_REPAINT,
86			CONTROL('L'), 0, A_REPAINT,
87			ESC, 'u', 0, A_UNDO_SEARCH,
88			'g', 0, A_GOLINE,
89			SK(SK_HOME), 0, A_GOLINE,
90			'<', 0, A_GOLINE,
91			ESC, '<', 0, A_GOLINE,
92			'p', 0, A_PERCENT,
93			'%', 0, A_PERCENT,
94			ESC, '[', 0, A_LSHIFT,
95			ESC, ']', 0, A_RSHIFT,
96			ESC, '(', 0, A_LSHIFT,
97			ESC, ')', 0, A_RSHIFT,
98			SK(SK_RIGHT_ARROW), 0, A_RSHIFT,
99			SK(SK_LEFT_ARROW), 0, A_LSHIFT,
100			'{', 0, A_F_BRACKET\|A_EXTRA, '{', '}', 0,
101			'}', 0, A_B_BRACKET\|A_EXTRA, '{', '}', 0,
102			'(', 0, A_F_BRACKET\|A_EXTRA, '(', ')', 0,
103			')', 0, A_B_BRACKET\|A_EXTRA, '(', ')', 0,
104			'[', 0, A_F_BRACKET\|A_EXTRA, '[', ']', 0,
105			']', 0, A_B_BRACKET\|A_EXTRA, '[', ']', 0,
106			ESC, CONTROL('F'), 0, A_F_BRACKET,
107			ESC, CONTROL('B'), 0, A_B_BRACKET,
108			'G', 0, A_GOEND,
109			ESC, '>', 0, A_GOEND,
110			'>', 0, A_GOEND,
111			SK(SK_END), 0, A_GOEND,
112			'P', 0, A_GOPOS,
113
114			'0', 0, A_DIGIT,
115			'1', 0, A_DIGIT,
116			'2', 0, A_DIGIT,
117			'3', 0, A_DIGIT,
118			'4', 0, A_DIGIT,
119			'5', 0, A_DIGIT,
120			'6', 0, A_DIGIT,
121			'7', 0, A_DIGIT,
122			'8', 0, A_DIGIT,
123			'9', 0, A_DIGIT,
124			'.', 0, A_DIGIT,
125
126			'=', 0, A_STAT,
127			CONTROL('G'), 0, A_STAT,
128			':', 'f', 0, A_STAT,
129			'/', 0, A_F_SEARCH,
130			'?', 0, A_B_SEARCH,
131			ESC, '/', 0, A_F_SEARCH\|A_EXTRA, '*', 0,
132			ESC, '?', 0, A_B_SEARCH\|A_EXTRA, '*', 0,
133			'n', 0, A_AGAIN_SEARCH,
134			ESC, 'n', 0, A_T_AGAIN_SEARCH,
135			'N', 0, A_REVERSE_SEARCH,
136			ESC, 'N', 0, A_T_REVERSE_SEARCH,
137			'&', 0, A_FILTER,
138			'm', 0, A_SETMARK,
139			'\'', 0, A_GOMARK,
140			CONTROL('X'), CONTROL('X'), 0, A_GOMARK,
141			'E', 0, A_EXAMINE,
142			':', 'e', 0, A_EXAMINE,
143			CONTROL('X'), CONTROL('V'), 0, A_EXAMINE,
144			':', 'n', 0, A_NEXT_FILE,
145			':', 'p', 0, A_PREV_FILE,
146			't', 0, A_NEXT_TAG,
147			'T', 0, A_PREV_TAG,
148			':', 'x', 0, A_INDEX_FILE,
149			':', 'd', 0, A_REMOVE_FILE,
150			':', 't', 0, A_OPT_TOGGLE\|A_EXTRA, 't', 0,
151			'\|', 0, A_PIPE,
152			'v', 0, A_VISUAL,
153			'+', 0, A_FIRSTCMD,
154
155			'H', 0, A_HELP,
156			'h', 0, A_HELP,
157			SK(SK_F1), 0, A_HELP,
158			'V', 0, A_VERSION,
159			'q', 0, A_QUIT,
160			'Q', 0, A_QUIT,
161			':', 'q', 0, A_QUIT,
162			':', 'Q', 0, A_QUIT,
163			'Z', 'Z', 0, A_QUIT
164			};
165
166			static unsigned char lesstable[] = {
167			'-', 0, A_OPT_TOGGLE,
168			's', 0, A_OPT_TOGGLE\|A_EXTRA, 'o', 0,
169			'_', 0, A_DISP_OPTION
170			};
171
172			static unsigned char moretable[] = {
173			's', 0, A_F_SKIP
174			};
175
176			static unsigned char edittable[] =
177			{
178			'\t', 0, EC_F_COMPLETE, /* TAB */
179			'\17', 0, EC_B_COMPLETE, /* BACKTAB */
180			SK(SK_BACKTAB), 0, EC_B_COMPLETE, /* BACKTAB */
181			ESC, '\t', 0, EC_B_COMPLETE, /* ESC TAB */
182			CONTROL('L'), 0, EC_EXPAND, /* CTRL-L */
183			CONTROL('V'), 0, EC_LITERAL, /* BACKSLASH */
184			CONTROL('A'), 0, EC_LITERAL, /* BACKSLASH */
185			ESC, 'l', 0, EC_RIGHT, /* ESC l */
186			SK(SK_RIGHT_ARROW), 0, EC_RIGHT, /* RIGHTARROW */
187			ESC, 'h', 0, EC_LEFT, /* ESC h */
188			SK(SK_LEFT_ARROW), 0, EC_LEFT, /* LEFTARROW */
189			ESC, 'b', 0, EC_W_LEFT, /* ESC b */
190			ESC, SK(SK_LEFT_ARROW), 0, EC_W_LEFT, /* ESC LEFTARROW */
191			SK(SK_CTL_LEFT_ARROW), 0, EC_W_LEFT, /* CTRL-LEFTARROW */
192			ESC, 'w', 0, EC_W_RIGHT, /* ESC w */
193			ESC, SK(SK_RIGHT_ARROW), 0, EC_W_RIGHT, /* ESC RIGHTARROW */
194			SK(SK_CTL_RIGHT_ARROW), 0, EC_W_RIGHT, /* CTRL-RIGHTARROW */
195			ESC, 'i', 0, EC_INSERT, /* ESC i */
196			SK(SK_INSERT), 0, EC_INSERT, /* INSERT */
197			ESC, 'x', 0, EC_DELETE, /* ESC x */
198			SK(SK_DELETE), 0, EC_DELETE, /* DELETE */
199			ESC, 'X', 0, EC_W_DELETE, /* ESC X */
200			ESC, SK(SK_DELETE), 0, EC_W_DELETE, /* ESC DELETE */
201			SK(SK_CTL_DELETE), 0, EC_W_DELETE, /* CTRL-DELETE */
202			SK(SK_CTL_BACKSPACE), 0, EC_W_BACKSPACE, /* CTRL-BACKSPACE */
203			ESC, '\b', 0, EC_W_BACKSPACE, /* ESC BACKSPACE */
204			ESC, '0', 0, EC_HOME, /* ESC 0 */
205			SK(SK_HOME), 0, EC_HOME, /* HOME */
206			ESC, '$', 0, EC_END, /* ESC $ */
207			SK(SK_END), 0, EC_END, /* END */
208			ESC, 'k', 0, EC_UP, /* ESC k */
209			SK(SK_UP_ARROW), 0, EC_UP, /* UPARROW */
210			ESC, 'j', 0, EC_DOWN, /* ESC j */
211			SK(SK_DOWN_ARROW), 0, EC_DOWN, /* DOWNARROW */
212			CONTROL('G'), 0, EC_ABORT, /* CTRL-G */
213			};
214
215			/*
216			* Structure to support a list of command tables.
217			*/
218			struct tablelist {
219			struct tablelist *t_next;
220			char *t_start;
221			char *t_end;
222			};
223
224			/*
225			* List of command tables and list of line-edit tables.
226			*/
227			static struct tablelist *list_fcmd_tables = NULL;
228			static struct tablelist *list_ecmd_tables = NULL;
229			static struct tablelist *list_var_tables = NULL;
230			static struct tablelist *list_sysvar_tables = NULL;
231
232
233			/*
234			* Expand special key abbreviations in a command table.
235			*/
236			static void
237			expand_special_keys(char *table, int len)
238			{
239			char *fm;
240			char *to;
241			int a;
242			char *repl;
243			int klen;
244
245	✓✓	2472	for (fm = table; fm < table + len; ) {
246			/*
247			* Rewrite each command in the table with any
248			* special key abbreviations expanded.
249			*/
250	✓✓	4160	for (to = fm; *fm != '\0'; ) {
251	✓✓	1552	if (*fm != SK_SPECIAL_KEY) {
252		1344	to++ = fm++;
253		1344	continue;
254			}
255			/*
256			* After SK_SPECIAL_KEY, next byte is the type
257			* of special key (one of the SK_* contants),
258			* and the byte after that is the number of bytes,
259			* N, reserved by the abbreviation (including the
260			* SK_SPECIAL_KEY and key type bytes).
261			* Replace all N bytes with the actual bytes
262			* output by the special key on this terminal.
263			*/
264		208	repl = special_key_str(fm[1]);
265		208	klen = fm[2] & 0377;
266		208	fm += klen;
267	✓✓✗✓	360	if (repl == NULL \|\| strlen(repl) > klen)
268		56	repl = "\377";
269	✓✓	1536	while (*repl != '\0')
270		560	to++ = repl++;
271			}
272		1200	*to++ = '\0';
273			/*
274			* Fill any unused bytes between end of command and
275			* the action byte with A_SKIP.
276			*/
277	✓✓	3776	while (to <= fm)
278		688	*to++ = A_SKIP;
279		1200	fm++;
280		1200	a = *fm++ & 0377;
281	✓✓	1200	if (a & A_EXTRA) {
282	✓✓	288	while (*fm++ != '\0')
283		128	continue;
284			}
285			}
286		24	}
287
288			/*
289			* Initialize the command lists.
290			*/
291			void
292			init_cmds(void)
293			{
294			/*
295			* Add the default command tables.
296			*/
297		16	add_fcmd_table((char *)cmdtable, sizeof (cmdtable));
298		8	add_ecmd_table((char *)edittable, sizeof (edittable));
299	✗✓	8	if (less_is_more) {
300			add_fcmd_table((char *)moretable, sizeof (moretable));
301			return;
302			} else {
303		8	add_fcmd_table((char *)lesstable, sizeof (lesstable));
304			}
305
306			/*
307			* Try to add the tables in the system lesskey file.
308			*/
309		8	add_hometable("LESSKEY_SYSTEM", LESSKEYFILE_SYS, 1);
310			/*
311			* Try to add the tables in the standard lesskey file "$HOME/.less".
312			*/
313		8	add_hometable("LESSKEY", LESSKEYFILE, 0);
314		16	}
315
316			/*
317			* Add a command table.
318			*/
319			static int
320			add_cmd_table(struct tablelist *tlist, char buf, int len)
321			{
322			struct tablelist *t;
323
324	✗✓	48	if (len == 0)
325			return (0);
326			/*
327			* Allocate a tablelist structure, initialize it,
328			* and link it into the list of tables.
329			*/
330	✗✓	24	if ((t = calloc(1, sizeof (struct tablelist))) == NULL) {
331			return (-1);
332			}
333		24	expand_special_keys(buf, len);
334		24	t->t_start = buf;
335		24	t->t_end = buf + len;
336		24	t->t_next = *tlist;
337		24	*tlist = t;
338		24	return (0);
339		24	}
340
341			/*
342			* Add a command table.
343			*/
344			void
345			add_fcmd_table(char *buf, int len)
346			{
347	✗✓	32	if (add_cmd_table(&list_fcmd_tables, buf, len) < 0)
348			error("Warning: some commands disabled", NULL);
349		16	}
350
351			/*
352			* Add an editing command table.
353			*/
354			void
355			add_ecmd_table(char *buf, int len)
356			{
357	✗✓	16	if (add_cmd_table(&list_ecmd_tables, buf, len) < 0)
358			error("Warning: some edit commands disabled", NULL);
359		8	}
360
361			/*
362			* Add an environment variable table.
363			*/
364			static void
365			add_var_table(struct tablelist *tlist, char buf, int len)
366			{
367			if (add_cmd_table(tlist, buf, len) < 0)
368			error("Warning: environment variables from "
369			"lesskey file unavailable", NULL);
370			}
371
372			/*
373			* Search a single command table for the command string in cmd.
374			*/
375			static int
376			cmd_search(const char cmd, char table, char endtable, char *sp)
377			{
378			char *p;
379			const char *q;
380			int a;
381
382		584	*sp = NULL;
383	✓✓	10800	for (p = table, q = cmd; p < endtable; p++, q++) {
384	✓✓	5248	if (p == q) {
385			/*
386			* Current characters match.
387			* If we're at the end of the string, we've found it.
388			* Return the action code, which is the character
389			* after the null at the end of the string
390			* in the command table.
391			*/
392	✓✓	628	if (*p == '\0') {
393		44	a = *++p & 0377;
394	✓✓	216	while (a == A_SKIP)
395		64	a = *++p & 0377;
396	✗✓	44	if (a == A_END_LIST) {
397			/*
398			* We get here only if the original
399			* cmd string passed in was empty ("").
400			* I don't think that can happen,
401			* but just in case ...
402			*/
403			return (A_UINVALID);
404			}
405			/*
406			* Check for an "extra" string.
407			*/
408	✗✓	44	if (a & A_EXTRA) {
409			*sp = ++p;
410			a &= ~A_EXTRA;
411			}
412		44	return (a);
413			}
414	✓✓	4620	} else if (*q == '\0') {
415			/*
416			* Hit the end of the user's command,
417			* but not the end of the string in the command table.
418			* The user's command is incomplete.
419			*/
420		96	return (A_PREFIX);
421			} else {
422			/*
423			* Not a match.
424			* Skip ahead to the next command in the
425			* command table, and reset the pointer
426			* to the beginning of the user's command.
427			*/
428	✗✓✗✗	4524	if (*p == '\0' && p[1] == A_END_LIST) {
429			/*
430			* A_END_LIST is a special marker that tells
431			* us to abort the cmd search.
432			*/
433			return (A_UINVALID);
434			}
435	✓✓	14758	while (*p++ != '\0')
436		5710	continue;
437	✓✓	13264	while (*p == A_SKIP)
438		2108	p++;
439	✓✓	4524	if (*p & A_EXTRA)
440	✓✓	786	while (*++p != '\0')
441		310	continue;
442		4524	q = cmd-1;
443			}
444			}
445			/*
446			* No match found in the entire command table.
447			*/
448		152	return (A_INVALID);
449		292	}
450
451			/*
452			* Decode a command character and return the associated action.
453			* The "extra" string, if any, is returned in sp.
454			*/
455			static int
456			cmd_decode(struct tablelist tlist, const char cmd, char **sp)
457			{
458			struct tablelist *t;
459			int action = A_INVALID;
460
461			/*
462			* Search thru all the command tables.
463			* Stop when we find an action which is not A_INVALID.
464			*/
465	✓✓	1834	for (t = tlist; t != NULL; t = t->t_next) {
466		292	action = cmd_search(cmd, t->t_start, t->t_end, sp);
467	✓✓	292	if (action != A_INVALID)
468			break;
469			}
470	✗✓	510	if (action == A_UINVALID)
471			action = A_INVALID;
472		510	return (action);
473			}
474
475			/*
476			* Decode a command from the cmdtables list.
477			*/
478			int
479			fcmd_decode(const char cmd, char *sp)
480			{
481		280	return (cmd_decode(list_fcmd_tables, cmd, sp));
482			}
483
484			/*
485			* Decode a command from the edittables list.
486			*/
487			int
488			ecmd_decode(const char cmd, char *sp)
489			{
490		24	return (cmd_decode(list_ecmd_tables, cmd, sp));
491			}
492
493			/*
494			* Get the value of an environment variable.
495			* Looks first in the lesskey file, then in the real environment.
496			*/
497			char *
498			lgetenv(char *var)
499			{
500			int a;
501		374	char *s;
502
503			/*
504			* Ignore lookups of any LESS* setting when we are more, and ignore
505			* the less key files
506			*/
507	✗✓	187	if (less_is_more) {
508			if (strncmp(var, "LESS", 4) == 0) {
509			return (NULL);
510			}
511			return (getenv(var));
512			}
513		187	a = cmd_decode(list_var_tables, var, &s);
514	✗✓	187	if (a == EV_OK)
515			return (s);
516		187	s = getenv(var);
517	✓✓✓✗	203	if (s != NULL && *s != '\0')
518		16	return (s);
519		171	a = cmd_decode(list_sysvar_tables, var, &s);
520	✗✓	171	if (a == EV_OK)
521			return (s);
522		171	return (NULL);
523		187	}
524
525			/*
526			* Get an "integer" from a lesskey file.
527			* Integers are stored in a funny format:
528			* two bytes, low order first, in radix KRADIX.
529			*/
530			static int
531			gint(char **sp)
532			{
533			int n;
534
535			n = (sp)++;
536			n += (sp)++ * KRADIX;
537			return (n);
538			}
539
540			/*
541			* Process an old (pre-v241) lesskey file.
542			*/
543			static int
544			old_lesskey(char *buf, int len)
545			{
546			/*
547			* Old-style lesskey file.
548			* The file must end with either
549			* ..,cmd,0,action
550			* or ...,cmd,0,action\|A_EXTRA,string,0
551			* So the last byte or the second to last byte must be zero.
552			*/
553			if (buf[len-1] != '\0' && buf[len-2] != '\0')
554			return (-1);
555			add_fcmd_table(buf, len);
556			return (0);
557			}
558
559			/*
560			* Process a new (post-v241) lesskey file.
561			*/
562			static int
563			new_lesskey(char *buf, int len, int sysvar)
564			{
565			char *p;
566			int c;
567			int n;
568
569			/*
570			* New-style lesskey file.
571			* Extract the pieces.
572			*/
573			if (buf[len-3] != C0_END_LESSKEY_MAGIC \|\|
574			buf[len-2] != C1_END_LESSKEY_MAGIC \|\|
575			buf[len-1] != C2_END_LESSKEY_MAGIC)
576			return (-1);
577			p = buf + 4;
578			for (;;) {
579			c = *p++;
580			switch (c) {
581			case CMD_SECTION:
582			n = gint(&p);
583			add_fcmd_table(p, n);
584			p += n;
585			break;
586			case EDIT_SECTION:
587			n = gint(&p);
588			add_ecmd_table(p, n);
589			p += n;
590			break;
591			case VAR_SECTION:
592			n = gint(&p);
593			add_var_table((sysvar) ?
594			&list_sysvar_tables : &list_var_tables, p, n);
595			p += n;
596			break;
597			case END_SECTION:
598			return (0);
599			default:
600			/*
601			* Unrecognized section type.
602			*/
603			return (-1);
604			}
605			}
606			}
607
608			/*
609			* Set up a user command table, based on a "lesskey" file.
610			*/
611			int
612			lesskey(char *filename, int sysvar)
613			{
614			char *buf;
615			off_t len;
616			long n;
617			int f;
618
619	✗✓	16	if (secure)
620			return (1);
621			/*
622			* Try to open the lesskey file.
623			*/
624		8	filename = shell_unquote(filename);
625		8	f = open(filename, O_RDONLY);
626		8	free(filename);
627	✓✗	8	if (f < 0)
628		8	return (1);
629
630			/*
631			* Read the file into a buffer.
632			* We first figure out the size of the file and allocate space for it.
633			* {{ Minimal error checking is done here.
634			* A garbage .less file will produce strange results.
635			* To avoid a large amount of error checking code here, we
636			* rely on the lesskey program to generate a good .less file. }}
637			*/
638			len = filesize(f);
639			if (len == -1 \|\| len < 3) {
640			/*
641			* Bad file (valid file must have at least 3 chars).
642			*/
643			(void) close(f);
644			return (-1);
645			}
646			if ((buf = calloc((int)len, sizeof (char))) == NULL) {
647			(void) close(f);
648			return (-1);
649			}
650			if (lseek(f, (off_t)0, SEEK_SET) == (off_t)-1) {
651			free(buf);
652			(void) close(f);
653			return (-1);
654			}
655			n = read(f, buf, (unsigned int) len);
656			close(f);
657			if (n != len) {
658			free(buf);
659			return (-1);
660			}
661
662			/*
663			* Figure out if this is an old-style (before version 241)
664			* or new-style lesskey file format.
665			*/
666			if (buf[0] != C0_LESSKEY_MAGIC \|\| buf[1] != C1_LESSKEY_MAGIC \|\|
667			buf[2] != C2_LESSKEY_MAGIC \|\| buf[3] != C3_LESSKEY_MAGIC)
668			return (old_lesskey(buf, (int)len));
669			return (new_lesskey(buf, (int)len, sysvar));
670		8	}
671
672			/*
673			* Add the standard lesskey file "$HOME/.less"
674			*/
675			void
676			add_hometable(char envname, char def_filename, int sysvar)
677			{
678			char *filename;
679		32	PARG parg;
680
681	✓✗✗✓	32	if (envname != NULL && (filename = lgetenv(envname)) != NULL)
682			filename = estrdup(filename);
683	✓✓	16	else if (sysvar)
684		8	filename = estrdup(def_filename);
685			else
686		8	filename = homefile(def_filename);
687	✓✓	16	if (filename == NULL)
688		8	return;
689	✗✓	8	if (lesskey(filename, sysvar) < 0) {
690			parg.p_string = filename;
691			error("Cannot use lesskey file \"%s\"", &parg);
692			}
693		8	free(filename);
694		24	}
695
696			/*
697			* See if a char is a special line-editing command.
698			*/
699			int
700			editchar(int c, int flags)
701			{
702			int action;
703			int nch;
704		24	char *s;
705		12	char usercmd[MAX_CMDLEN+1];
706
707			/*
708			* An editing character could actually be a sequence of characters;
709			* for example, an escape sequence sent by pressing the uparrow key.
710			* To match the editing string, we use the command decoder
711			* but give it the edit-commands command table
712			* This table is constructed to match the user's keyboard.
713			*/
714	✓✗✗✓	24	if (c == erase_char \|\| c == erase2_char)
715			return (EC_BACKSPACE);
716	✗✓	12	if (c == kill_char)
717			return (EC_LINEKILL);
718
719			/*
720			* Collect characters in a buffer.
721			* Start with the one we have, and get more if we need them.
722			*/
723			nch = 0;
724		12	do {
725	✗✓	12	if (nch > 0)
726			c = getcc();
727		12	usercmd[nch] = (char)c;
728		12	usercmd[nch+1] = '\0';
729			nch++;
730		12	action = ecmd_decode(usercmd, &s);
731	✗✓	12	} while (action == A_PREFIX);
732
733	✗✓	12	if (flags & EC_NORIGHTLEFT) {
734			switch (action) {
735			case EC_RIGHT:
736			case EC_LEFT:
737			action = A_INVALID;
738			break;
739			}
740			}
741	✗✓	12	if (flags & EC_NOHISTORY) {
742			/*
743			* The caller says there is no history list.
744			* Reject any history-manipulation action.
745			*/
746			switch (action) {
747			case EC_UP:
748			case EC_DOWN:
749			action = A_INVALID;
750			break;
751			}
752			}
753	✓✗	12	if (flags & EC_NOCOMPLETE) {
754			/*
755			* The caller says we don't want any filename completion cmds.
756			* Reject them.
757			*/
758	✗✗✗✓	12	switch (action) {
759			case EC_F_COMPLETE:
760			case EC_B_COMPLETE:
761			case EC_EXPAND:
762			action = A_INVALID;
763			break;
764			}
765			}
766	✓✗	12	if ((flags & EC_PEEK) \|\| action == A_INVALID) {
767			/*
768			* We're just peeking, or we didn't understand the command.
769			* Unget all the characters we read in the loop above.
770			* This does NOT include the original character that was
771			* passed in as a parameter.
772			*/
773	✗✓	24	while (nch > 1) {
774			ungetcc(usercmd[--nch]);
775			}
776			} else {
777			if (s != NULL)
778			ungetsc(s);
779			}
780		12	return (action);
781		12	}