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powcmd2.c
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/*
* cmd2.c -- back-end for the various #commands
*
* (created: Massimiliano Ghilardi (Cosmos), Aug 14th, 1998)
*
* Copyright (C) 1998 by Massimiliano Ghilardi
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <ctype.h>
#include <time.h>
#include <sys/types.h>
#include <errno.h>
#include "malloc.h"
#include "regex.h"
//int select();
#include "powdefines.h"
#include "powutils.h"
#include "powmain.h"
#include "powlist.h"
#include "poweval.h"
#include "powedit.h"
#include "powtty.h"
#include "powcmd2.h"
#include "powhook.h"
#include "putty.h"
/* anyone knows if ANSI 6429 talks about more than 8 colors? */
static char *colornames[] = {
"black", "red", "green", "yellow", "blue", "magenta", "cyan", "white",
"BLACK", "RED", "GREEN", "YELLOW", "BLUE", "MAGENTA", "CYAN", "WHITE", "none"
};
static char *tmpcommand;
static char *tmpfuncname;
static keynode *tmpkeynode;
/*
* show defined aliases
*/
void show_aliases (void)
{
aliasnode *p;
char buf[BUFSIZE];
sprintf(errtext,"#%s alias%s defined%c\r\n", sortedaliases ? "the following" : "no",
(sortedaliases && !sortedaliases->snext) ? " is" : "es are",
sortedaliases ? ':' : '.');
reverse_sortedlist((sortednode **)&sortedaliases);
from_backend(0,errtext,strlen(errtext));
for (p = sortedaliases; p; p = p->snext) {
escape_specials(buf, p->name);
sprintf(errtext,"#alias %s=%s\r\n", buf, p->subst);
from_backend(0,errtext,strlen(errtext));
}
reverse_sortedlist((sortednode **)&sortedaliases);
}
/*
* check if an alias name contains dangerous things.
* return 1 if illegal name (and print reason).
* if valid, print a warning for unbalanced () {} and ""
*/
static int check_alias (char * name)
{
char *p = name, c;
enum { NORM, ESCAPE } state = NORM;
int quotes=0, paren=0, braces=0, ok = 1;
if (!*p) {
printf("#illegal alias name: is empty!\r\n");
error = INVALID_NAME_ERROR;
return 1;
}
if (*p == '{') {
printf("#illegal beginning '{' in alias name: `%s'\r\n", name);
error = INVALID_NAME_ERROR;
return 1;
}
if (strchr(name, ' ')) {
printf("#illegal spaces in alias name: `%s'\r\n", name);
error = INVALID_NAME_ERROR;
return 1;
}
for (; ok && (c = *p); p++) switch (state) {
case NORM:
if (c == ESC)
state = ESCAPE;
else if (quotes) {
if (c == '\"')
quotes = 0;
}
else if (c == '\"')
quotes = 1;
else if (c == ')')
paren--;
else if (c == '(')
paren++;
else if (c == '}')
braces--;
else if (c == '{')
braces++;
else if (c == CMDSEP && !paren && !braces)
ok = 0;
break;
case ESCAPE:
if (c == ESC)
state = ESCAPE;
else /* if (c == ESC2 || c != ESC2) */
state = NORM;
default:
break;
}
if (!ok) {
printf("#illegal non-escaped `;' in alias name: `%s'\r\n", name);
error = INVALID_NAME_ERROR;
return 1;
}
if (quotes || paren || braces) {
printf("#warning: unbalanced%s%s%s in alias name `%s' may cause problems\r\n",
quotes ? " \"\"" : "", paren ? " ()" : "", braces ? " {}" : "", name);
}
return 0;
}
/*
* parse the #alias command
*/
void parse_alias (char * str)
{
char *left, *right;
aliasnode **np, *p;
left = str = skipspace(str);
str = first_valid(str, '=');
if (*str == '=') {
*str = '\0';
right = ++str;
unescape(left);
if (check_alias(left))
return;
p = *(np = lookup_alias(left));
if (!*str) {
/* delete alias */
if (p) {
if (echo_int) {
sprintf(errtext,"#deleting alias: %s=%s\r\n", left, p->subst);
from_backend(0,errtext,strlen(errtext));
}
delete_aliasnode(np);
} else {
sprintf("#unknown alias, cannot delete: `%s'\r\n", left);
from_backend(0,errtext,strlen(errtext));
}
} else {
/* add/redefine alias */
/* direct recursion is supported (alias CAN be defined by itself) */
if (p) {
free(p->subst);
p->subst = my_strdup(right);
} else
add_aliasnode(left, right);
if (echo_int) {
sprintf(errtext,"#%s alias: %s=%s\r\n", p ? "changed" : "new",
left, right);
from_backend(0,errtext,strlen(errtext));
}
}
} else {
/* show alias */
*str = '\0';
unescape(left);
if (check_alias(left))
return;
np = lookup_alias(left);
if (*np) {
char buf[BUFSIZE];
escape_specials(buf, left);
sprintf(errtext, "#alias %.*s=%.*s\r\n",
BUFSIZE-9, buf,
BUFSIZE-(int)strlen(buf)-9, (*np)->subst);
from_backend(0,errtext,strlen(errtext));
} else {
sprintf(errtext,"#unknown alias, cannot show: `%s'\r\n", left);
from_backend(0,errtext,strlen(errtext));
}
}
}
/*
* delete an action node
*/
static void delete_action (actionnode ** nodep)
{
if (echo_int) {
sprintf(errtext,"#deleting action: >%c%s %s\r\n", (*nodep)->active ?
'+' : '-', (*nodep)->label, (*nodep)->pattern);
from_backend(0,errtext,strlen(errtext));
}
delete_actionnode(nodep);
}
/*
* delete a prompt node
*/
static void delete_prompt (actionnode ** nodep)
{
if (echo_int) {
sprintf(errtext,"#deleting prompt: >%c%s %s\r\n", (*nodep)->active ?
'+' : '-', (*nodep)->label, (*nodep)->pattern);
from_backend(0,errtext,strlen(errtext));
}
delete_promptnode(nodep);
}
/*
* create new action
*/
static void add_new_action (char * label, char * pattern, char * command, int active, int type, void * q)
{
add_actionnode(pattern, command, label, active, type, q);
if (echo_int) {
sprintf(errtext,"#new action: %c%c%s %s=%s\r\n",
action_chars[type],
active ? '+' : '-', label,
pattern, command);
from_backend(0,errtext,strlen(errtext));
}
}
/*
* create new prompt
*/
static void add_new_prompt (char * label, char * pattern, char * command, int active, int type, void * q)
{
add_promptnode(pattern, command, label, active, type, q);
if (echo_int) {
sprintf(errtext,"#new prompt: %c%c%s %s=%s\r\n",
action_chars[type],
active ? '+' : '-', label,
pattern, command);
from_backend(0,errtext,strlen(errtext));
}
}
/*
* add an action with numbered label
*/
static void add_anonymous_action (char * pattern, char * command, int type, void * q)
{
static int last = 0;
char label[16];
do {
sprintf(label, "%d", ++last);
} while (*lookup_action(label));
add_new_action(label, pattern, command, 1, type, q);
}
#define ONPROMPT (onprompt ? "prompt" : "action")
/*
* change fields of an existing action node
* pattern or commands can be NULL if no change
*/
static void change_actionorprompt (actionnode * node, char * pattern, char * command, int type, void * q, int onprompt)
{
if (node->type == ACTION_REGEXP && node->regexp) {
regfree((regex_t *)(node->regexp));
free(node->regexp);
}
node->regexp = q;
if (pattern) {
free(node->pattern);
node->pattern = my_strdup(pattern);
node->type = type;
}
if (command) {
free(node->command);
node->command = my_strdup(command);
}
if (echo_int) {
sprintf(errtext,"#changed %s %c%c%s %s=%s\r\n", ONPROMPT,
action_chars[node->type],
node->active ? '+' : '-',
node->label, node->pattern, node->command);
from_backend(0,errtext,strlen(errtext));
}
}
/*
* show defined actions
*/
void show_actions (void)
{
actionnode *p;
sprintf(errtext,"#%s action%s defined%c\r\n", actions ? "the following" : "no",
(actions && !actions->next) ? " is" : "s are", actions ? ':' : '.');
from_backend(0,errtext,strlen(errtext));
for (p = actions; p; p = p->next) {
sprintf(errtext,"#action %c%c%s %s=%s\r\n",
action_chars[p->type],
p->active ? '+' : '-', p->label,
p->pattern, p->command);
from_backend(0,errtext,strlen(errtext));
}
}
/*
* show defined prompts
*/
void show_prompts (void)
{
promptnode *p;
sprintf(errtext,"#%s prompt%s defined%c\r\n", prompts ? "the following" : "no",
(prompts && !prompts->next) ? " is" : "s are", prompts ? ':' : '.');
from_backend(0,errtext,strlen(errtext));
for (p = prompts; p; p = p->next)
sprintf(errtext,"#prompt %c%c%s %s=%s\r\n",
action_chars[p->type],
p->active ? '+' : '-', p->label,
p->pattern, p->command);
from_backend(0,errtext,strlen(errtext));
}
/*
* parse the #action and #prompt commands
* this function is too damn complex because of the hairy syntax. it should be
* split up or rewritten as an fsm instead.
*/
void parse_action (char * str, int onprompt)
{
char *p, label[BUFSIZE], pattern[BUFSIZE], *command;
actionnode **np = NULL;
char sign, assign, hastail;
char active, type = ACTION_WEAK, kind;
void *regexp = 0;
sign = *(p = skipspace(str));
if (!sign) {
sprintf(errtext,"%s: no arguments given\r\n", ONPROMPT);
from_backend(0,errtext,strlen(errtext));
return;
}
str = p + 1;
switch (sign) {
case '+':
case '-': /* edit */
case '<': /* delete */
case '=': /* list */
assign = sign;
break;
case '%': /* action_chars[ACTION_REGEXP] */
type = ACTION_REGEXP;
/* falltrough */
case '>': /* action_chars[ACTION_WEAK] */
/* define/edit */
assign = '>';
sign = *(p + 1);
if (!sign) {
sprintf(errtext,"#%s: label expected\r\n", ONPROMPT);
from_backend(0,errtext,strlen(errtext));
return;
} else if (sign == '+' || sign == '-')
str++;
else
sign = '+';
break;
default:
assign = 0; /* anonymous action */
str = p;
break;
}
/* labelled action: */
if (assign != 0) {
p = first_regular(str, ' ');
if ((hastail = *p))
*p = '\0';
my_strncpy(label, str, BUFSIZE-1);
if (hastail)
*p++ = ' '; /* p points to start of pattern, or to \0 */
if (!*label) {
sprintf(errtext,"#%s: label expected\r\n", ONPROMPT);
from_backend(0,errtext,strlen(errtext));
return;
}
if (onprompt)
np = lookup_prompt(label);
else
np = lookup_action(label);
/* '<' : remove action */
if (assign == '<') {
if (!np || !*np) {
sprintf(errtext,"#no %s, cannot delete label: `%s'\r\n",
ONPROMPT, label);
from_backend(0,errtext,strlen(errtext));
}
else {
if (onprompt)
delete_prompt(np);
else
delete_action(np);
}
/* '>' : define action */
} else if (assign == '>') {
if (sign == '+')
active = 1;
else
active = 0;
if (!*label) {
sprintf(errtext,"#%s: label expected\r\n", ONPROMPT);
from_backend(0,errtext,strlen(errtext));
return;
}
p = skipspace(p);
if (*p == '(') {
ptr pbuf = (ptr)0;
p++;
kind = evalp(&pbuf, &p);
if (!REAL_ERROR && kind != TYPE_TXT)
error=NO_STRING_ERROR;
if (REAL_ERROR) {
sprintf(errtext,"#%s: ", ONPROMPT);
from_backend(0,errtext,strlen(errtext));
print_error(error=NO_STRING_ERROR);
ptrdel(pbuf);
return;
}
if (pbuf) {
my_strncpy(pattern, ptrdata(pbuf), BUFSIZE-1);
ptrdel(pbuf);
} else
pattern[0] = '\0';
if (*p)
p = skipspace(++p);
if ((hastail = *p == '='))
p++;
}
else {
p = first_regular(command = p, '=');
if ((hastail = *p))
*p = '\0';
my_strncpy(pattern, command, BUFSIZE-1);
if (hastail)
*p++ = '=';
}
if (!*pattern) {
sprintf(errtext,"#error: pattern of #%ss must be non-empty.\r\n", ONPROMPT);
from_backend(0,errtext,strlen(errtext));
return;
}
if (type == ACTION_REGEXP && hastail) {
int errcode;
char unesc_pat[BUFSIZE];
/*
* HACK WARNING:
* we unescape regexp patterns now, instead of doing
* jit+unescape at runtime, as for weak actions.
*/
strcpy(unesc_pat, pattern);
unescape(unesc_pat);
regexp = malloc(sizeof(regex_t));
if (!regexp) {
errmsg("malloc");
return;
}
if ((errcode = regcomp((regex_t *)regexp, unesc_pat, REG_EXTENDED))) {
int n;
char *tmp;
n = regerror(errcode, (regex_t *)regexp, NULL, 0);
tmp = (char *)malloc(n);
if (tmp) {
if (!regerror(errcode, (regex_t *)regexp, tmp, n))
errmsg("regerror");
else {
sprintf(errtext,"#regexp error: %s\r\n", tmp);
from_backend(0,errtext,strlen(errtext));
}
free(tmp);
} else {
error = NO_MEM_ERROR;
errmsg("malloc");
}
regfree((regex_t *)regexp);
free(regexp);
return;
}
}
command = p;
if (hastail) {
if (np && *np) {
change_actionorprompt(*np, pattern, command, type, regexp, onprompt);
(*np)->active = active;
} else {
if (onprompt)
add_new_prompt(label, pattern, command, active,
type, regexp);
else
add_new_action(label, pattern, command, active,
type, regexp);
}
}
/* '=': list action */
} else if (assign == '='){
if (np && *np) {
int len = (int)strlen((*np)->label);
sprintf(inserted_next, "#%s %c%c%.*s %.*s=%.*s", ONPROMPT,
action_chars[(*np)->type], (*np)->active ? '+' : '-',
BUFSIZE - 6 /*strlen(ONPROMPT)*/ - 7, (*np)->label,
BUFSIZE - 6 /*strlen(ONPROMPT)*/ - 7 - len, (*np)->pattern,
BUFSIZE - 6 /*strlen(ONPROMPT)*/ - 7 - len - (int)strlen((*np)->pattern),
(*np)->command);
} else {
sprintf(errtext,"#no %s, cannot list label: `%s'\r\n", ONPROMPT, label);
from_backend(0,errtext,strlen(errtext));
}
/* '+', '-': turn action on/off */
} else {
if (np && *np) {
(*np)->active = (sign == '+');
if (echo_int) {
sprintf(errtext,"#%s %c%s %s is now o%s.\r\n", ONPROMPT,
action_chars[(*np)->type],
label,
(*np)->pattern, (sign == '+') ? "n" : "ff");
from_backend(0,errtext,strlen(errtext));
}
} else {
sprintf(errtext,"#no %s, cannot turn o%s label: `%s'\r\n", ONPROMPT,
(sign == '+') ? "n" : "ff", label);
from_backend(0,errtext,strlen(errtext));
}
}
/* anonymous action, cannot be regexp */
} else {
if (onprompt) {
tty_printf("#anonymous prompts not supported.#please use labelled prompts.\r\n");
return;
}
command = first_regular(str, '=');
if (*command == '=') {
*command = '\0';
my_strncpy(pattern, str, BUFSIZE-1);
*command++ = '=';
np = lookup_action_pattern(pattern);
if (*command)
if (np && *np)
change_actionorprompt(*np, NULL, command, ACTION_WEAK, NULL, 0);
else
add_anonymous_action(pattern, command, ACTION_WEAK, NULL);
else if (np && *np)
delete_action(np);
else {
sprintf(errtext,"#no action, cannot delete pattern: `%s'\r\n",
pattern);
from_backend(0,errtext,strlen(errtext));
return;
}
} else {
np = lookup_action_pattern(str);
if (np && *np) {
sprintf(errtext,inserted_next, "#action %.*s=%.*s",
BUFSIZE - 10, (*np)->pattern,
BUFSIZE - (int)strlen((*np)->pattern) - 10,
(*np)->command);
from_backend(0,errtext,strlen(errtext));
} else {
sprintf(errtext,"#no action, cannot show pattern: `%s'\r\n", pattern);
from_backend(0,errtext,strlen(errtext));
}
}
}
}
#undef ONPROMPT
/*
* display attribute syntax
*/
void show_attr_syntax (void)
{
int i;
tty_printf("#attribute syntax:\r\n\tOne or more of:\tbold, blink, underline, inverse\r\n\tand/or\t[foreground] [ON background]\r\n\tColors: ");
for (i = 0; i < COLORS; i++)
sprintf(errtext,"%s%s", colornames[i],
(i == LOWCOLORS - 1 || i == COLORS - 1) ? "\r\n\t\t" : ",");
from_backend(0,errtext,strlen(errtext));
sprintf(errtext,"%s\r\n", colornames[i]);
from_backend(0,errtext,strlen(errtext));
}
/*
* put escape sequences to turn on/off an attribute in given buffers
*/
void attr_string (int attrcode, char * begin, char * end)
{
int fg = FOREGROUND(attrcode), bg = BACKGROUND(attrcode),
tok = ATTR(attrcode);
char need_end = 0;
*begin = *end = '\0';
if (tok > (ATTR_BOLD | ATTR_BLINK | ATTR_UNDER | ATTR_REVERSE)
|| fg > COLORS || bg > COLORS || attrcode == NOATTRCODE)
return; /* do nothing */
if (fg < COLORS)
if (bg < COLORS)
sprintf(begin, "\033[3%d;4%dm", fg,bg);
else
sprintf(begin, "\033[3%dm", fg);
else
if (bg < COLORS)
sprintf(begin, "\033[%s%dm", bg<LOWCOLORS ? "4" : "10", bg % LOWCOLORS);
switch (tok) {
case 256 : /* bold */
strcat(begin,"\033[1m");
break;
case 512 : /* underline */
strcat(begin,"\033[4m");
break;
case 1024: /* inverse */
strcat(begin,"\033[7m");
break;
case 2048: /* blink */
strcat(begin,"\033[5m");
break;
}
}
/*
* parse attribute description in line.
* Return attribute if successful, -1 otherwise.
*/
int parse_attributes (char * line)
{
char *p;
int tok = 0, fg, bg, t = -1;
if (!(p = strtok(line, " ")))
return NOATTRCODE;
fg = bg = NO_COLOR;
while (t && p) {
if (!_strnicmp(p, "bold",4))
t = ATTR_BOLD;
else if (!_strnicmp(p, "blink",5))
t = ATTR_BLINK;
else if (!_strnicmp(p, "underline",9))
t = ATTR_UNDER;
else if (!_strnicmp(p, "inverse",6) || !_strnicmp(p, "reverse",7))
t = ATTR_REVERSE;
else
t = 0;
if (t) {
tok |= t;
p = strtok(NULL, " ");
}
}
if (!p)
return ATTRCODE(tok, fg, bg);
for (t = 0; t <= COLORS && strcmp(p, colornames[t]); t++)
;
if (t <= COLORS) {
fg = t;
p = strtok(NULL, " ");
}
if (!p)
return ATTRCODE(tok, fg, bg);
if (_strnicmp(p, "on",2))
return -1; /* invalid attribute */
if (!(p = strtok(NULL, " ")))
return -1;
for (t = 0; t <= COLORS && strcmp(p, colornames[t]); t++)
;
if (t <= COLORS)
bg = t;
else
return -1;
return ATTRCODE(tok, fg, bg);
}
/*
* return a static pointer to name of given attribute code
*/
char *attr_name (int attrcode)
{
static char name[BUFSIZE];
int fg = FOREGROUND(attrcode), bg = BACKGROUND(attrcode), tok = ATTR(attrcode);
name[0] = 0;
if (tok > (ATTR_BOLD | ATTR_BLINK | ATTR_UNDER | ATTR_REVERSE) || fg > COLORS || bg > COLORS)
return name; /* error! */
if (tok & ATTR_BOLD)
strcat(name, "bold ");
if (tok & ATTR_BLINK)
strcat(name, "blink ");
if (tok & ATTR_UNDER)
strcat(name, "underline ");
if (tok & ATTR_REVERSE)
strcat(name, "inverse ");
if (fg < COLORS || (fg == bg && fg == COLORS && !tok))
strcat(name, colornames[fg]);
if (bg < COLORS) {
strcat(name, " on ");
strcat(name, colornames[bg]);
}
if (!*name)
strcpy(name, "none");
return name;
}
/*
* show defined marks
*/
void show_marks (void)
{
marknode *p;
sprintf(errtext,"#%s marker%s defined%c\r\n", markers ? "the following" : "no",
(markers && !markers->next) ? " is" : "s are",
markers ? ':' : '.');
from_backend(0,errtext,strlen(errtext));
for (p = markers; p; p = p->next) {
sprintf(errtext,"#mark %s%s=%s\r\n", p->mbeg ? "^" : "",
p->pattern, attr_name(p->attrcode));
from_backend(0,errtext,strlen(errtext));
}
}
/*
* parse arguments to the #mark command
*/
void parse_mark (char * str)
{
char *p;
marknode **np, *n;
char mbeg = 0;
if (*str == '=') {
tty_printf("#marker must be non-null.\r\n");
return;
}
p = first_regular(str, '=');
if (!*p) {
if (*str == '^')
mbeg = 1, str++;
unescape(str);
np = lookup_marker(str, mbeg);
if ((n = *np)) {
ptr pbuf = (ptr)0;
char *name;
pbuf = ptrmescape(pbuf, n->pattern, strlen(n->pattern), 0);
if (MEM_ERROR) { ptrdel(pbuf); return; }
name = attr_name(n->attrcode);
sprintf(inserted_next, "#mark %s%.*s=%.*s", n->mbeg ? "^" : "",
BUFSIZE-(int)strlen(name)-9, pbuf ? ptrdata(pbuf) : "",
BUFSIZE-9, name);
ptrdel(pbuf);
} else {
sprintf(errtext,"#unknown marker, cannot show: `%s'\r\n", str);
from_backend(0,errtext,strlen(errtext));
}
} else {
int attrcode, wild = 0;
char pattern[BUFSIZE], *p2;
*(p++) = '\0';
p = skipspace(p);
if (*str == '^')
mbeg = 1, str++;
my_strncpy(pattern, str, BUFSIZE-1);
unescape(pattern);
p2 = pattern;
while (*p2) {
if (ISMARKWILDCARD(*p2)) {
wild = 1;
if (ISMARKWILDCARD(*(p2 + 1))) {
error=SYNTAX_ERROR;
tty_printf("#error: two wildcards (& or $) may not be next to eachother\r\n");
return;
}
}
p2++;
}
np = lookup_marker(pattern, mbeg);
attrcode = parse_attributes(p);
if (attrcode == -1) {
tty_printf("#invalid attribute syntax.\r\n");
error=SYNTAX_ERROR;
if (echo_int) show_attr_syntax();
} else if (!*p)
if ((n = *np)) {
if (echo_int) {
sprintf(errtext,"#deleting mark: %s%s=%s\r\n", n->mbeg ? "^" : "",
n->pattern, attr_name(n->attrcode));
from_backend(0,errtext,strlen(errtext));
}
delete_marknode(np);
} else {
sprintf(errtext,"#unknown marker, cannot delete: `%s%s'\r\n",
mbeg ? "^" : "", pattern);
from_backend(0,errtext,strlen(errtext));
}
else {
if (*np) {
(*np)->attrcode = attrcode;
if (echo_int) {
tty_printf("#changed");
}
} else {
add_marknode(pattern, attrcode, mbeg, wild);
if (echo_int) {
tty_printf("#new");
}
}
if (echo_int)
sprintf(errtext," mark: %s%s=%s\r\n", mbeg ? "^" : "",
pattern, attr_name(attrcode));
from_backend(0,errtext,strlen(errtext));
}
}
}
/*
* turn ASCII description of a sequence
* into raw escape sequence
* return pointer to end of ASCII description
*/
static char *unescape_seq (char * buf, char * seq, int * seqlen)
{
char c, *start = buf;
enum { NORM, ESCSINGLE, ESCAPE, CARET, DONE } state = NORM;
for (; (c = *seq); seq++) {
switch (state) {
case NORM:
if (c == '^')
state = CARET;
else if (c == ESC)
state = ESCSINGLE;
else if (c == '=')
state = DONE;
else
*(buf++) = c;
break;
case CARET:
/*
* handle ^@ ^A ... ^_ as expected:
* ^@ == 0x00, ^A == 0x01, ... , ^_ == 0x1f
*/
if (c > 0x40 && c < 0x60)
*(buf++) = c & 0x1f;
/* special case: ^? == 0x7f */
else if (c == '?')
*(buf++) = 0x7f;
state = NORM;
break;
case ESCSINGLE:
case ESCAPE:
/*
* GH: \012 ==> octal number
*/
if (state == ESCSINGLE &&
ISODIGIT(seq[0]) && ISODIGIT(seq[1]) && ISODIGIT(seq[2])) {
*(buf++) =(((seq[0] - '0') << 6) |
((seq[1] - '0') << 3) |
(seq[2] - '0'));
seq += 2;
} else {
*(buf++) = c;
if (c == ESC)
state = ESCAPE;
else
state = NORM;
}
break;
default:
break;
}
if (state == DONE)
break;
}
*buf = '\0';
*seqlen = buf - start;
return seq;
}
/*
* print an escape sequence in human-readably form.
*/
void print_seq (char * seq, int len)
{
char ch;
while (len--) {
ch = *(seq++);
if (ch == '\033') {
tty_printf("esc ");
continue;
}
if (ch < ' ') {
tty_putc('^');
ch |= '@';
}
if (ch == ' ')
tty_printf("space ");
else if (ch == 0x7f)
tty_printf("del ");
else if (ch & 0x80) {
sprintf(errtext,"\\%03o ", ch);
from_backend(0,errtext,strlen(errtext));
}else {
sprintf(errtext,"%c ", ch);
from_backend(0,errtext,strlen(errtext));
}
}
}
/*
* return a static pointer to escape sequence made printable, for use in
* definition-files
*/
char *seq_name (char * seq, int len)
{
static char buf[CAPLEN*4];
char *p = buf;
char c;