From 045ad46441a1cf2ff358af0126f8c57f337804fa Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Fri, 4 Aug 2023 17:39:07 +0300 Subject: [PATCH] lib/string_helpers: Add kstrdup_and_replace() helper 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 Link: https://lore.kernel.org/r/20230804143910.15504-2-andriy.shevchenko@linux.intel.com Signed-off-by: Stephen Boyd --- 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