From 79142cd28173e3d089581366c809957552b40900 Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <alx@kernel.org>
Date: Wed, 11 Dec 2024 01:57:29 +0100
Subject: [PATCH] lib/string/ctype/strisascii/: strisdigit(): Add function

Reviewed-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 lib/Makefile.am                          |  2 ++
 lib/string/ctype/strisascii/strisdigit.c | 12 +++++++++
 lib/string/ctype/strisascii/strisdigit.h | 32 ++++++++++++++++++++++++
 3 files changed, 46 insertions(+)
 create mode 100644 lib/string/ctype/strisascii/strisdigit.c
 create mode 100644 lib/string/ctype/strisascii/strisdigit.h

diff --git a/lib/Makefile.am b/lib/Makefile.am
index fc39e0179..307e70469 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -186,6 +186,8 @@ libshadow_la_SOURCES = \
 	spawn.c \
 	sssd.c \
 	sssd.h \
+	string/ctype/strisascii/strisdigit.c \
+	string/ctype/strisascii/strisdigit.h \
 	string/memset/memzero.c \
 	string/memset/memzero.h \
 	string/sprintf/snprintf.c \
diff --git a/lib/string/ctype/strisascii/strisdigit.c b/lib/string/ctype/strisascii/strisdigit.c
new file mode 100644
index 000000000..a0e144994
--- /dev/null
+++ b/lib/string/ctype/strisascii/strisdigit.c
@@ -0,0 +1,12 @@
+// SPDX-FileCopyrightText: 2024, Alejandro Colomar <alx@kernel.org>
+// SPDX-License-Identifier: BSD-3-Clause
+
+
+#include <config.h>
+
+#include "string/ctype/strisascii/strisdigit.h"
+
+#include <stdbool.h>
+
+
+extern inline bool strisdigit(const char *s);
diff --git a/lib/string/ctype/strisascii/strisdigit.h b/lib/string/ctype/strisascii/strisdigit.h
new file mode 100644
index 000000000..065ba19fe
--- /dev/null
+++ b/lib/string/ctype/strisascii/strisdigit.h
@@ -0,0 +1,32 @@
+// SPDX-FileCopyrightText: 2024, Alejandro Colomar <alx@kernel.org>
+// SPDX-License-Identifier: BSD-3-Clause
+
+
+#ifndef SHADOW_INCLUDE_LIB_STRING_CTYPE_STRISASCII_STRISDIGIT_H_
+#define SHADOW_INCLUDE_LIB_STRING_CTYPE_STRISASCII_STRISDIGIT_H_
+
+
+#include <config.h>
+
+#include <stdbool.h>
+
+#include "string/strcmp/streq.h"
+#include "string/strspn/stpspn.h"
+
+
+inline bool strisdigit(const char *s);
+
+
+// string is [:digit:]
+// Like isdigit(3), but check all characters in the string.
+inline bool
+strisdigit(const char *s)
+{
+	if (streq(s, ""))
+		return false;
+
+	return streq(stpspn(s, "0123456789"), "");
+}
+
+
+#endif  // include guard
-- 
2.47.2