util: Introduce env helpers

include/util/env.h

@@ -0,0 +1,11 @@
+#ifndef UTIL_ENV_H
+#define UTIL_ENV_H
+
+#include <stdbool.h>
+#include <unistd.h>
+
+bool env_parse_bool(const char *option);
+
+ssize_t env_parse_switch(const char *option, const char **switches);
+
+#endif

util/env.c

@@ -0,0 +1,38 @@
+#include <stdlib.h>
+#include <string.h>
+#include <wlr/util/log.h>
+#include "util/env.h"
+
+bool env_parse_bool(const char *option) {
+	const char *env = getenv(option);
+	if (env) {
+		wlr_log(WLR_INFO, "Loading %s option: %s", option, env);
+	}
+
+	if (!env || strcmp(env, "0") == 0) {
+		return false;
+	} else if (strcmp(env, "1") == 0) {
+		return true;
+	}
+
+	wlr_log(WLR_ERROR, "Unknown %s option: %s", option, env);
+	return false;
+}
+
+ssize_t env_parse_switch(const char *option, const char **switches) {
+	const char *env = getenv(option);
+	if (env) {
+		wlr_log(WLR_INFO, "Loading %s option: %s", option, env);
+	} else {
+		return 0;
+	}
+
+	for (ssize_t i = 0; switches[i]; i++) {
+		if (strcmp(env, switches[i]) == 0) {
+			return i;
+		}
+	}
+
+	wlr_log(WLR_ERROR, "Unknown %s option: %s", option, env);
+	return 0;
+}

util/meson.build

@@ -2,6 +2,7 @@ wlr_files += files(
 	'addon.c',
 	'array.c',
 	'box.c',
+	'env.c',
 	'global.c',
 	'log.c',
 	'region.c',