ubgpsuite/lonetix/sys/con_unix.c

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2021-06-07 16:55:13 +02:00
// SPDX-License-Identifier: LGPL-3.0-or-later
/**
* \file sys/con_unix.c
*
* Implements Unix console Input/Output.
*
* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
* \author Lorenzo Cogotti
*/
#include "sys/con.h"
#include "sys/fs.h"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/select.h>
#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static int STM_TOFILDES(void *streamp)
{
return (int) ((Sintptr) streamp);
}
static Sint64 Sys_OpConRead(void *streamp, void *buf, size_t nbytes)
{
return Sys_Fread(STM_TOFILDES(streamp), buf, nbytes);
}
static Sint64 Sys_OpConWrite(void *streamp, const void *buf, size_t nbytes)
{
return Sys_Fwrite(STM_TOFILDES(streamp), buf, nbytes);
}
static Judgement Sys_OpConFinish(void *streamp)
{
USED(streamp);
return OK; // NOP
}
static const StmOps con_stmOps = {
Sys_OpConRead,
Sys_OpConWrite,
NULL,
NULL,
Sys_OpConFinish,
NULL
};
const StmOps *const Stm_ConOps = &con_stmOps;
void Sys_Print(ConHn hn, const char *s)
{
(void) write(hn, s, strlen(s));
}
void Sys_VPrintf(ConHn hn, const char *fmt, va_list va)
{
va_list vc;
int n1, n2;
char *buf;
va_copy(vc, va);
n1 = vsnprintf(NULL, 0, fmt, vc);
va_end(vc);
if (n1 <= 0)
return;
buf = (char *) alloca(n1 + 1);
n2 = vsnprintf(buf, n1 + 1, fmt, va);
if (n2 <= 0)
return;
assert(n2 == n1);
(void) write(hn, buf, n2);
}
void Sys_Printf(ConHn hn, const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
Sys_VPrintf(hn, fmt, va);
va_end(va);
}
size_t Sys_Read(ConHn hn, char *buf, size_t n)
{
ssize_t nr = read(hn, buf, n);
if (nr < 0)
nr = 0;
return nr;
}
size_t Sys_NbRead(ConHn hn, char *buf, size_t n)
{
fd_set rfds;
struct timeval tv;
FD_ZERO(&rfds);
FD_SET(hn, &rfds);
tv.tv_sec = 0;
tv.tv_usec = 0;
if (select(1 + hn, &rfds, NULL, NULL, &tv) != 1)
return 0;
ssize_t nr = read(hn, buf, n);
if (nr < 0)
nr = 0;
return nr;
}
Boolean Sys_IsVt100Console(ConHn hn)
{
static const char *const knownTerms[] = {
"xterm", "xterm-color", "xterm-256color",
"screen", "screen-256color", "tmux",
"tmux-256color", "rxvt-unicode", "rxvt-unicode-256color",
"linux", "cygwin"
};
const char *term = getenv("TERM");
if (!term)
return FALSE;
size_t i;
for (i = 0; i < ARRAY_SIZE(knownTerms); i++) {
if (strcmp(term, knownTerms[i]) == 0)
break;
}
return i != ARRAY_SIZE(knownTerms) && isatty(hn);
}