1 files changed, 136 insertions, 0 deletions
diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h
new file mode 100644
index 000000000..8530c7328
--- /dev/null
+++ b/include/linux/string_helpers.h
@@ -0,0 +1,136 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_STRING_HELPERS_H_
+#define _LINUX_STRING_HELPERS_H_
+
+#include <linux/bits.h>
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+struct device;
+struct file;
+struct task_struct;
+
+/* Descriptions of the types of units to
+ * print in */
+enum string_size_units {
+	STRING_UNITS_10,	/* use powers of 10^3 (standard SI) */
+	STRING_UNITS_2,		/* use binary powers of 2^10 */
+};
+
+void string_get_size(u64 size, u64 blk_size, enum string_size_units units,
+		     char *buf, int len);
+
+int parse_int_array_user(const char __user *from, size_t count, int **array);
+
+#define UNESCAPE_SPACE		BIT(0)
+#define UNESCAPE_OCTAL		BIT(1)
+#define UNESCAPE_HEX		BIT(2)
+#define UNESCAPE_SPECIAL	BIT(3)
+#define UNESCAPE_ANY		\
+	(UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_HEX | UNESCAPE_SPECIAL)
+
+#define UNESCAPE_ALL_MASK	GENMASK(3, 0)
+
+int string_unescape(char *src, char *dst, size_t size, unsigned int flags);
+
+static inline int string_unescape_inplace(char *buf, unsigned int flags)
+{
+	return string_unescape(buf, buf, 0, flags);
+}
+
+static inline int string_unescape_any(char *src, char *dst, size_t size)
+{
+	return string_unescape(src, dst, size, UNESCAPE_ANY);
+}
+
+static inline int string_unescape_any_inplace(char *buf)
+{
+	return string_unescape_any(buf, buf, 0);
+}
+
+#define ESCAPE_SPACE		BIT(0)
+#define ESCAPE_SPECIAL		BIT(1)
+#define ESCAPE_NULL		BIT(2)
+#define ESCAPE_OCTAL		BIT(3)
+#define ESCAPE_ANY		\
+	(ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_SPECIAL | ESCAPE_NULL)
+#define ESCAPE_NP		BIT(4)
+#define ESCAPE_ANY_NP		(ESCAPE_ANY | ESCAPE_NP)
+#define ESCAPE_HEX		BIT(5)
+#define ESCAPE_NA		BIT(6)
+#define ESCAPE_NAP		BIT(7)
+#define ESCAPE_APPEND		BIT(8)
+
+#define ESCAPE_ALL_MASK		GENMASK(8, 0)
+
+int string_escape_mem(const char *src, size_t isz, char *dst, size_t osz,
+		unsigned int flags, const char *only);
+
+static inline int string_escape_mem_any_np(const char *src, size_t isz,
+		char *dst, size_t osz, const char *only)
+{
+	return string_escape_mem(src, isz, dst, osz, ESCAPE_ANY_NP, only);
+}
+
+static inline int string_escape_str(const char *src, char *dst, size_t sz,
+		unsigned int flags, const char *only)
+{
+	return string_escape_mem(src, strlen(src), dst, sz, flags, only);
+}
+
+static inline int string_escape_str_any_np(const char *src, char *dst,
+		size_t sz, const char *only)
+{
+	return string_escape_str(src, dst, sz, ESCAPE_ANY_NP, only);
+}
+
+static inline void string_upper(char *dst, const char *src)
+{
+	do {
+		*dst++ = toupper(*src);
+	} while (*src++);
+}
+
+static inline void string_lower(char *dst, const char *src)
+{
+	do {
+		*dst++ = tolower(*src);
+	} while (*src++);
+}
+
+char *kstrdup_quotable(const char *src, gfp_t gfp);
+char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp);
+char *kstrdup_quotable_file(struct file *file, gfp_t gfp);
+
+char **kasprintf_strarray(gfp_t gfp, const char *prefix, size_t n);
+void kfree_strarray(char **array, size_t n);
+
+char **devm_kasprintf_strarray(struct device *dev, const char *prefix, size_t n);
+
+static inline const char *str_yes_no(bool v)
+{
+	return v ? "yes" : "no";
+}
+
+static inline const char *str_on_off(bool v)
+{
+	return v ? "on" : "off";
+}
+
+static inline const char *str_enable_disable(bool v)
+{
+	return v ? "enable" : "disable";
+}
+
+static inline const char *str_enabled_disabled(bool v)
+{
+	return v ? "enabled" : "disabled";
+}
+
+static inline const char *str_read_write(bool v)
+{
+	return v ? "read" : "write";
+}
+
+#endif