[*] Initial commit

lonetix/sys/con_unix.c

@@ -0,0 +1,143 @@
+// 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);
+}