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/* $NetBSD: commands.c,v 1.17 2021/12/06 22:45:42 rillig Exp $ */
/*-
* Copyright 2009 Brett Lymn <blymn@NetBSD.org>
* Copyright 2021 Roland Illig <rillig@NetBSD.org>
*
* All rights reserved.
*
* This code has been donated to The NetBSD Foundation by the Author.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <curses.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <err.h>
#include <sys/types.h>
#include "returns.h"
#include "slave.h"
#include "command_table.h"
extern int initdone;
static void report_message(data_enum_t, const char *);
/*
* Match the passed command string and execute the associated test
* function.
*/
void
command_execute(char *func, int nargs, char **args)
{
size_t i, j;
for (i = 0; i < ncmds; i++) {
if (strcmp(func, commands[i].name) != 0)
continue;
/* Check only restricted set of functions is called before
* initscr/newterm */
if (initdone) {
/* matched function */
commands[i].func(nargs, args);
return;
}
for (j = 0; j < nrcmds; j++) {
if (strcmp(func, restricted_commands[j]) != 0)
continue;
if (strcmp(func, "initscr") == 0 ||
strcmp(func, "newterm") == 0)
initdone = 1;
/* matched function */
commands[i].func(nargs, args);
return;
}
report_status("YOU NEED TO CALL INITSCR/NEWTERM FIRST");
return;
}
report_status("UNKNOWN_FUNCTION");
}
static void
write_to_director(const void *mem, size_t size)
{
ssize_t nwritten = write(to_director, mem, size);
if (nwritten == -1)
err(1, "writing to director failed");
if ((size_t)nwritten != size)
errx(1, "short write to director, expected %zu, got %zd",
size, nwritten);
}
static void
write_to_director_int(int i)
{
write_to_director(&i, sizeof(i));
}
static void
write_to_director_type(data_enum_t return_type)
{
write_to_director_int(return_type);
}
/*
* Report a pointer value back to the director
*/
void
report_ptr(void *ptr)
{
char *string;
if (ptr == NULL)
asprintf(&string, "NULL");
else
asprintf(&string, "%p", ptr);
report_status(string);
free(string);
}
/*
* Report an integer value back to the director
*/
void
report_int(int value)
{
char *string;
asprintf(&string, "%d", value);
report_status(string);
free(string);
}
/*
* Report either an ERR or OK back to the director
*/
void
report_return(int status)
{
if (status == ERR)
write_to_director_type(data_err);
else if (status == OK)
write_to_director_type(data_ok);
else if (status == KEY_CODE_YES)
report_int(status);
else
report_status("INVALID_RETURN");
}
/*
* Report the number of returns back to the director via the command pipe
*/
void
report_count(int count)
{
write_to_director_type(data_count);
write_to_director_int(count);
}
/*
* Report the status back to the director via the command pipe
*/
void
report_status(const char *status)
{
report_message(data_string, status);
}
/*
* Report an error message back to the director via the command pipe.
*/
void
report_error(const char *status)
{
report_message(data_slave_error, status);
}
/*
* Report the message with the given type back to the director via the
* command pipe.
*/
static void
report_message(data_enum_t type, const char *status)
{
size_t len = strlen(status);
write_to_director_type(type);
write_to_director_int(len);
write_to_director(status, len);
}
/*
* Report a string of chtype back to the director via the command pipe.
*/
void
report_byte(chtype c)
{
chtype string[2];
string[0] = c;
string[1] = A_NORMAL | '\0';
report_nstr(string);
}
/*
* Report a string of chtype back to the director via the command pipe.
*/
void
report_nstr(chtype *string)
{
size_t size;
chtype *p;
for (p = string; (*p & __CHARTEXT) != 0; p++)
continue;
size = (size_t)(p + 1 - string) * sizeof(*p);
write_to_director_type(data_byte);
write_to_director_int(size);
write_to_director(string, size);
}
/*
* Report a cchar_t back to the director via the command pipe.
*/
void
report_cchar(cchar_t c)
{
write_to_director_type(data_cchar);
write_to_director_int(sizeof(c));
write_to_director(&c, sizeof(c));
}
/*
* Report a wchar_t back to the director via the command pipe.
*/
void
report_wchar(wchar_t ch)
{
wchar_t wstr[2];
wstr[0] = ch;
wstr[1] = L'\0';
report_wstr(wstr);
}
/*
* Report a string of wchar_t back to the director via the command pipe.
*/
void
report_wstr(wchar_t *wstr)
{
size_t size;
wchar_t *p;
for (p = wstr; *p != L'\0'; p++)
continue;
size = (size_t)(p + 1 - wstr) * sizeof(*p);
write_to_director_type(data_wchar);
write_to_director_int(size);
write_to_director(wstr, size);
}
/*
* Check the number of args we received are what we expect. Return an
* error if they do not match.
*/
int
check_arg_count(int nargs, int expected)
{
if (nargs != expected) {
report_count(1);
report_error("INCORRECT_ARGUMENT_NUMBER");
return 1;
}
return 0;
}
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