From: Karel Zak <kzak@redhat.com>
Date: Wed, 18 Mar 2026 10:17:31 +0000 (+0100)
Subject: lib/strutils: add ul_strtobool()
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5022295152686f103fe4347cae2167bcedd5b8c3;p=thirdparty%2Futil-linux.git

lib/strutils: add ul_strtobool()

Add a locale-independent string to boolean parsing function.
Supported true values: 1, y, t, yes, true, on, enable.
Supported false values: 0, no, not, false, off, disable.

Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/include/strutils.h b/include/strutils.h
index d034f6b95..f6256efa1 100644
--- a/include/strutils.h
+++ b/include/strutils.h
@@ -71,6 +71,7 @@ extern int isxdigit_strend(const char *str, const char **end);
 #define isxdigit_string(_s)	isxdigit_strend(_s, NULL)
 
 
+extern int ul_strtobool(const char *str, bool *result);
 extern int ul_parse_switch(const char *arg, ...);
 
 #ifndef HAVE_MEMPCPY
diff --git a/lib/strutils.c b/lib/strutils.c
index dd67fc554..0fce3c7c6 100644
--- a/lib/strutils.c
+++ b/lib/strutils.c
@@ -16,6 +16,7 @@
 #include <assert.h>
 
 #include "c.h"
+#include "cctype.h"
 #include "nls.h"
 #include "strutils.h"
 #include "bitops.h"
@@ -250,6 +251,34 @@ int isxdigit_strend(const char *str, const char **end)
 /*
  *  For example: ul_parse_switch(argv[i], "on", "off",  "yes", "no",  NULL);
  */
+int ul_strtobool(const char *str, bool *result)
+{
+	static const char *bool_true[]  = { "1", "y", "t", "yes", "true", "on", "enable" };
+	static const char *bool_false[] = { "0", "no", "not", "false", "off", "disable" };
+	size_t i;
+
+	if (!str || !result)
+		return -(errno = EINVAL);
+
+	errno = 0;
+
+	for (i = 0; i < ARRAY_SIZE(bool_true); i++) {
+		if (c_strcasecmp(str, bool_true[i]) == 0) {
+			*result = true;
+			return 0;
+		}
+	}
+
+	for (i = 0; i < ARRAY_SIZE(bool_false); i++) {
+		if (c_strcasecmp(str, bool_false[i]) == 0) {
+			*result = false;
+			return 0;
+		}
+	}
+
+	return -(errno = EINVAL);
+}
+
 int ul_parse_switch(const char *arg, ...)
 {
 	const char *a, *b;
@@ -1326,8 +1355,6 @@ char *ul_optstr_get_value(const char *optstr, const char *key)
 
 #ifdef TEST_PROGRAM_STRUTILS
 
-#include "cctype.h"
-
 struct testS {
 	char *name;
 	char *value;
@@ -1461,6 +1488,13 @@ int main(int argc, char *argv[])
 						"1", "0",
 						NULL));
 		return EXIT_SUCCESS;
+	} else if (argc == 3 && strcmp(argv[1], "--strtobool") == 0) {
+		bool val;
+		if (ul_strtobool(argv[2], &val))
+			err(EXIT_FAILURE, "could not parse '%s'", argv[2]);
+		printf("'%s'-->%s\n", argv[2], val ? "true" : "false");
+		return EXIT_SUCCESS;
+
 	} else if (argc == 4 && strcmp(argv[1], "--cmp-paths") == 0) {
 		return test_strutils_cmp_paths(argc - 1, argv + 1);
 
@@ -1530,6 +1564,7 @@ int main(int argc, char *argv[])
 			return EXIT_SUCCESS;
 	} else {
 		fprintf(stderr, "usage: %1$s --size <number>[suffix]\n"
+				"       %1$s --strtobool <str>\n"
 				"       %1$s --parse-switch <str>\n"
 				"       %1$s --cmp-paths <path> <path>\n"
 				"       %1$s --strdup-member <str> <str>\n"