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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 <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230804143910.15504-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Andy Shevchenko 2023-08-04 17:39:07 +03:00 committed by Stephen Boyd
parent 06c2afb862
commit 045ad46441
2 changed files with 17 additions and 0 deletions
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2
include/linux/string_helpers.h
View File

@ -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);

15
lib/string_helpers.c
View File

@ -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