| Message ID | 20211105124242.27288-1-andriy.shevchenko@linux.intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v1,01/19] lib/string_helpers: Introduce kasprintf_strarray() | expand |
On Fri, 2021-11-05 at 14:42 +0200, Andy Shevchenko wrote: > We have a few users already that basically want to have array of > sequential strings to be allocated and filled. > > Provide a helper for them (basically adjusted version from gpio-mockup.c). I think this is overkill and unnecessary bloat for the number of actual or possible in-tree uses. The devm_ variant too. And it'd be useful to have an 0/n patch cover letter describing why the patchset is useful so I could reply to that instead of the 1/n. > diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h [] > @@ -100,6 +100,7 @@ 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); > > #endif > diff --git a/lib/string_helpers.c b/lib/string_helpers.c [] > @@ -674,6 +674,39 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp) > } > EXPORT_SYMBOL_GPL(kstrdup_quotable_file); > > +/** > + * kasprintf_strarray - allocate and fill array of sequential strings > + * @gfp: flags for the slab allocator > + * @prefix: prefix to be used > + * @n: amount of lines to be allocated and filled > + * > + * Allocates and fills @n strings using pattern "%s-%zu", where prefix > + * is provided by caller. The caller is responsible to free them with > + * kfree_strarray() after use. > + * > + * Returns array of strings or NULL when memory can't be allocated. > + */ > +char **kasprintf_strarray(gfp_t gfp, const char *prefix, size_t n) > +{ > + char **names; > + size_t i; > + > + names = kcalloc(n + 1, sizeof(char *), gfp); > + if (!names) > + return NULL; > + > + for (i = 0; i < n; i++) { > + names[i] = kasprintf(gfp, "%s-%zu", prefix, i); > + if (!names[i]) { > + kfree_strarray(names, i); > + return NULL; > + } > + } > + > + return names; > +} > +EXPORT_SYMBOL_GPL(kasprintf_strarray); > + > /** > * kfree_strarray - free a number of dynamically allocated strings contained > * in an array and the array itself
On Fri, Nov 5, 2021 at 1:43 PM Andy Shevchenko <andriy.shevchenko@linux.intel.com> wrote: > We have a few users already that basically want to have array of > sequential strings to be allocated and filled. > > Provide a helper for them (basically adjusted version from gpio-mockup.c). > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Fulfils Rusty Russell's API design hierarchy requirements and help people to make less mistakes so: Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Yours, Linus Walleij
On Tue, Nov 09, 2021 at 12:42:00PM +0100, Linus Walleij wrote: > On Fri, Nov 5, 2021 at 1:43 PM Andy Shevchenko > <andriy.shevchenko@linux.intel.com> wrote: > > > We have a few users already that basically want to have array of > > sequential strings to be allocated and filled. > > > > Provide a helper for them (basically adjusted version from gpio-mockup.c). > > > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > > Fulfils Rusty Russell's API design hierarchy requirements > and help people to make less mistakes so: > Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Thanks! Should I resend, take into mine PR, or you just apply it as is? As I answered previously the series doesn't require additional work from my perspective.
On Mon, Nov 15, 2021 at 01:23:02PM +0200, Andy Shevchenko wrote: > On Tue, Nov 09, 2021 at 12:42:00PM +0100, Linus Walleij wrote: > > On Fri, Nov 5, 2021 at 1:43 PM Andy Shevchenko > > <andriy.shevchenko@linux.intel.com> wrote: > > > > > We have a few users already that basically want to have array of > > > sequential strings to be allocated and filled. > > > > > > Provide a helper for them (basically adjusted version from gpio-mockup.c). > > > > > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > > > > Fulfils Rusty Russell's API design hierarchy requirements > > and help people to make less mistakes so: > > Reviewed-by: Linus Walleij <linus.walleij@linaro.org> > > Thanks! > > Should I resend, take into mine PR, or you just apply it as is? > > As I answered previously the series doesn't require additional work > from my perspective. Okay, I'm about to send a PR to you and Bart for this. Does it sound good?
On Thu, Nov 18, 2021 at 5:56 PM Andy Shevchenko <andriy.shevchenko@linux.intel.com> wrote: > > On Mon, Nov 15, 2021 at 01:23:02PM +0200, Andy Shevchenko wrote: > > On Tue, Nov 09, 2021 at 12:42:00PM +0100, Linus Walleij wrote: > > > On Fri, Nov 5, 2021 at 1:43 PM Andy Shevchenko > > > <andriy.shevchenko@linux.intel.com> wrote: > > > > > > > We have a few users already that basically want to have array of > > > > sequential strings to be allocated and filled. > > > > > > > > Provide a helper for them (basically adjusted version from gpio-mockup.c). > > > > > > > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > > > > > > Fulfils Rusty Russell's API design hierarchy requirements > > > and help people to make less mistakes so: > > > Reviewed-by: Linus Walleij <linus.walleij@linaro.org> > > > > Thanks! > > > > Should I resend, take into mine PR, or you just apply it as is? > > > > As I answered previously the series doesn't require additional work > > from my perspective. > > Okay, I'm about to send a PR to you and Bart for this. > Does it sound good? > Sounds good to me. Bart
diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h index 4ba39e1403b2..f67a94013c87 100644 --- a/include/linux/string_helpers.h +++ b/include/linux/string_helpers.h @@ -100,6 +100,7 @@ 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); #endif diff --git a/lib/string_helpers.c b/lib/string_helpers.c index d5d008f5b1d9..9758997c465e 100644 --- a/lib/string_helpers.c +++ b/lib/string_helpers.c @@ -674,6 +674,39 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp) } EXPORT_SYMBOL_GPL(kstrdup_quotable_file); +/** + * kasprintf_strarray - allocate and fill array of sequential strings + * @gfp: flags for the slab allocator + * @prefix: prefix to be used + * @n: amount of lines to be allocated and filled + * + * Allocates and fills @n strings using pattern "%s-%zu", where prefix + * is provided by caller. The caller is responsible to free them with + * kfree_strarray() after use. + * + * Returns array of strings or NULL when memory can't be allocated. + */ +char **kasprintf_strarray(gfp_t gfp, const char *prefix, size_t n) +{ + char **names; + size_t i; + + names = kcalloc(n + 1, sizeof(char *), gfp); + if (!names) + return NULL; + + for (i = 0; i < n; i++) { + names[i] = kasprintf(gfp, "%s-%zu", prefix, i); + if (!names[i]) { + kfree_strarray(names, i); + return NULL; + } + } + + return names; +} +EXPORT_SYMBOL_GPL(kasprintf_strarray); + /** * kfree_strarray - free a number of dynamically allocated strings contained * in an array and the array itself
We have a few users already that basically want to have array of sequential strings to be allocated and filled. Provide a helper for them (basically adjusted version from gpio-mockup.c). Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> --- include/linux/string_helpers.h | 1 + lib/string_helpers.c | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+)