[PATCH v2 1/4] lib/string_helpers: Add kstrdup_and_replace() helper

Andy Shevchenko
2023-08-04T14:39:24Z

Duplicate a NULL-terminated string and replace all occurrences of
the old character with a new one. In other words, provide functionality
of kstrdup() + strreplace().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
include/linux/string_helpers.h | 2 ++
lib/string_helpers.c | 15 +++++++++++++++
2 files changed, 17 insertions(+)

diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h
index 789ab30045da..9d1f5bb74dd5 100644
--- a/include/linux/string_helpers.h
+++ b/include/linux/string_helpers.h
@@ -109,6 +109,8 @@ 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 *kstrdup_and_replace(const char *src, char old, char new, gfp_t gfp);
+
char **kasprintf_strarray(gfp_t gfp, const char *prefix, size_t n);
void kfree_strarray(char **array, size_t n);

diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index d3b1dd718daf..9982344cca34 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -719,6 +719,21 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp)
}
EXPORT_SYMBOL_GPL(kstrdup_quotable_file);

+/*
+ * Returns duplicate string in which the @old characters are replaced by @new.
+ */
+char *kstrdup_and_replace(const char *src, char old, char new, gfp_t gfp)
+{
+ char *dst;
+
+ dst = kstrdup(src, gfp);
+ if (!dst)
+ return NULL;
+
+ return strreplace(dst, old, new);
+}
+EXPORT_SYMBOL_GPL(kstrdup_and_replace);
+
/**
* kasprintf_strarray - allocate and fill array of sequential strings
* @gfp: flags for the slab allocator
--
2.40.0.1.gaa8946217a0b