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Wysocki" , Peter De Schrijver , Prashant Gaikwad , Michael Turquette , Thierry Reding , Jonathan Hunter , Tero Kristo , Andy Shevchenko Subject: [PATCH v1 1/4] lib/string_helpers: Add kstrdup_and_replace() helper Date: Wed, 28 Jun 2023 18:32:08 +0300 Message-Id: <20230628153211.52988-2-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.40.0.1.gaa8946217a0b In-Reply-To: <20230628153211.52988-1-andriy.shevchenko@linux.intel.com> References: <20230628153211.52988-1-andriy.shevchenko@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1769961155512239843?= X-GMAIL-MSGID: =?utf-8?q?1769961155512239843?= 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 --- 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