mirror of https://git.zx2c4.com/WireGuard
80 lines
1.4 KiB
C
80 lines
1.4 KiB
C
/* Copyright 2015-2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */
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#define _GNU_SOURCE
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#include <ctype.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <unistd.h>
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static bool color_mode(FILE *file)
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{
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static int mode = -1;
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char *var;
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if (mode != -1)
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return mode;
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var = getenv("WG_COLOR_MODE");
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if (var && !strcmp(var, "always"))
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mode = true;
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else if (var && !strcmp(var, "never"))
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mode = false;
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else
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return isatty(fileno(file));
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return mode;
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}
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static void filter_ansi(FILE *file, const char *fmt, va_list args)
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{
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char *str = NULL;
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size_t len, i, j;
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if (color_mode(file)) {
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vfprintf(file, fmt, args);
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return;
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}
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len = vasprintf(&str, fmt, args);
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if (len >= 2) {
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for (i = 0; i < len - 2; ++i) {
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if (str[i] == '\x1b' && str[i + 1] == '[') {
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str[i] = str[i + 1] = '\0';
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for (j = i + 2; j < len; ++j) {
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if (isalpha(str[j]))
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break;
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str[j] = '\0';
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}
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str[j] = '\0';
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}
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}
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}
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for (i = 0; i < len; i = j) {
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fputs(&str[i], file);
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for (j = i + strlen(&str[i]); j < len; ++j) {
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if (str[j] != '\0')
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break;
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}
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}
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free(str);
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}
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void terminal_printf(const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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filter_ansi(stdout, fmt, args);
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va_end(args);
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}
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void terminal_fprintf(FILE *file, const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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filter_ansi(file, fmt, args);
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va_end(args);
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}
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