Initial commit

1 files changed, 79 insertions, 0 deletions

diff --git a/src/tools/terminal.c b/src/tools/terminal.c
new file mode 100644
index 0000000..74d04c2
--- /dev/null
+++ b/src/tools/terminal.c
@@ -0,0 +1,79 @@
+/* Copyright 2015-2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */
+
+#define _GNU_SOURCE
+#include <ctype.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <unistd.h>
+
+static bool color_mode(FILE *file)
+{
+	static int mode = -1;
+	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
+		return isatty(fileno(file));
+	return mode;
+}
+
+static void filter_ansi(FILE *file, const char *fmt, va_list args)
+{
+	char *str = NULL;
+	size_t len, i, j;
+
+	if (color_mode(file)) {
+		vfprintf(file, 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 (isalpha(str[j]))
+						break;
+					str[j] = '\0';
+				}
+				str[j] = '\0';
+			}
+		}
+	}
+	for (i = 0; i < len; i = j) {
+		fputs(&str[i], file);
+		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(stdout, fmt, args);
+	va_end(args);
+}
+
+void terminal_fprintf(FILE *file, const char *fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	filter_ansi(file, fmt, args);
+	va_end(args);
+}