freebsd-src/contrib/wireguard-tools/terminal.c
Kyle Evans adf3764857 Add 'contrib/wireguard-tools/' from commit '7e00bf8773b93a2a3ee28dba2710d2ae443989f1'
git-subtree-dir: contrib/wireguard-tools
git-subtree-mainline: 9142a2a37b
git-subtree-split: 7e00bf8773
2022-10-28 22:05:14 -05:00

77 lines
1.3 KiB
C

// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <unistd.h>
#include "ctype.h"
#include "terminal.h"
static bool color_mode(void)
{
static int mode = -1;
const char *var;
if (mode != -1)
return mode;
var = getenv("WG_COLOR_MODE");
if (var && !strcmp(var, "always"))
mode = true;
else if (var && !strcmp(var, "never"))
mode = false;
else
mode = isatty(fileno(stdout));
return mode;
}
static void filter_ansi(const char *fmt, va_list args)
{
char *str = NULL;
size_t len, i, j;
if (color_mode()) {
vfprintf(stdout, fmt, args);
return;
}
len = vasprintf(&str, fmt, args);
if (len >= 2) {
for (i = 0; i < len - 2; ++i) {
if (str[i] == '\x1b' && str[i + 1] == '[') {
str[i] = str[i + 1] = '\0';
for (j = i + 2; j < len; ++j) {
if (char_is_alpha(str[j]))
break;
str[j] = '\0';
}
str[j] = '\0';
}
}
}
for (i = 0; i < len; i = j) {
fputs(&str[i], stdout);
for (j = i + strlen(&str[i]); j < len; ++j) {
if (str[j] != '\0')
break;
}
}
free(str);
}
void terminal_printf(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
filter_ansi(fmt, args);
va_end(args);
}