From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Bartosz Golaszewski <brgl@bgdev.pl>,
Jianqun Xu <jay.xu@rock-chips.com>,
Linus Walleij <linus.walleij@linaro.org>,
Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@xilinx.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org
Cc: Bamvor Jian Zhang <bamv2005@gmail.com>,
Andrew Lunn <andrew@lunn.ch>,
Gregory Clement <gregory.clement@bootlin.com>,
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
Heiko Stuebner <heiko@sntech.de>,
Patrice Chotard <patrice.chotard@foss.st.com>,
Michal Simek <michal.simek@xilinx.com>,
Andy Shevchenko <andy@kernel.org>
Subject: [PATCH v1 01/19] lib/string_helpers: Introduce kasprintf_strarray()
Date: Fri, 5 Nov 2021 14:42:24 +0200 [thread overview]
Message-ID: <20211105124242.27288-1-andriy.shevchenko@linux.intel.com> (raw)
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(+)
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
--
2.33.0
next reply other threads:[~2021-11-05 12:43 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-05 12:42 Andy Shevchenko [this message]
2021-11-05 12:42 ` [PATCH v1 02/19] lib/string_helpers: Introduce managed variant of kasprintf_strarray() Andy Shevchenko
2021-11-05 12:42 ` [PATCH v1 03/19] pinctrl/rockchip: Drop wrong kernel doc annotation Andy Shevchenko
2021-11-06 16:32 ` Heiko Stübner
2021-11-05 12:42 ` [PATCH v1 04/19] pinctrl/rockchip: Use temporary variable for struct device Andy Shevchenko
2021-11-08 12:46 ` Heiko Stübner
2021-11-05 12:42 ` [PATCH v1 05/19] pinctrl/rockchip: Make use of the devm_platform_get_and_ioremap_resource() Andy Shevchenko
2021-11-08 12:48 ` Heiko Stübner
2021-11-05 12:42 ` [PATCH v1 06/19] pinctrl/rockchip: Convert to use dev_err_probe() Andy Shevchenko
2021-11-08 12:49 ` Heiko Stübner
2021-11-05 12:42 ` [PATCH v1 07/19] pinctrl/rockchip: Switch to use devm_kasprintf_strarray() Andy Shevchenko
2021-11-08 12:51 ` Heiko Stübner
2021-11-05 12:42 ` [PATCH v1 08/19] pinctrl: armada-37xx: Fix function name in the kernel doc Andy Shevchenko
2021-11-08 10:37 ` Gregory CLEMENT
2021-11-05 12:42 ` [PATCH v1 09/19] pinctrl: armada-37xx: Use temporary variable for struct device Andy Shevchenko
2021-11-08 10:49 ` Gregory CLEMENT
2021-11-05 12:42 ` [PATCH v1 10/19] pinctrl: armada-37xx: Make use of the devm_platform_ioremap_resource() Andy Shevchenko
2021-11-08 10:56 ` Gregory CLEMENT
2021-11-05 12:42 ` [PATCH v1 11/19] pinctrl: armada-37xx: Convert to use dev_err_probe() Andy Shevchenko
2021-11-08 10:59 ` Gregory CLEMENT
2021-11-05 12:42 ` [PATCH v1 12/19] pinctrl: armada-37xx: Switch to use devm_kasprintf_strarray() Andy Shevchenko
2021-11-08 11:09 ` Gregory CLEMENT
2021-11-05 12:42 ` [PATCH v1 13/19] pinctrl: st: Drop wrong kernel doc annotations Andy Shevchenko
2021-11-09 11:32 ` Linus Walleij
2021-11-09 12:04 ` Andy Shevchenko
2021-11-05 12:42 ` [PATCH v1 14/19] pinctrl: st: Use temporary variable for struct device Andy Shevchenko
2021-11-06 7:50 ` Joe Perches
[not found] ` <CAHp75Ve0Bv9VsWFFZxL9wYk=Z_Mm7nat-vf7g8HHTiROi7EY=Q@mail.gmail.com>
2021-11-06 8:28 ` Joe Perches
2021-11-08 9:26 ` Andy Shevchenko
2021-11-09 11:55 ` Linus Walleij
2021-11-09 12:07 ` Andy Shevchenko
2021-11-09 12:09 ` Andy Shevchenko
2021-11-05 12:42 ` [PATCH v1 15/19] pinctrl: st: Make use of the devm_platform_ioremap_resource_byname() Andy Shevchenko
2021-11-09 11:33 ` Linus Walleij
2021-11-05 12:42 ` [PATCH v1 16/19] pinctrl: st: Convert to use dev_err_probe() Andy Shevchenko
2021-11-09 11:34 ` Linus Walleij
2021-11-05 12:42 ` [PATCH v1 17/19] pinctrl: st: Switch to use devm_kasprintf_strarray() Andy Shevchenko
2021-11-09 11:34 ` Linus Walleij
2021-11-05 12:42 ` [PATCH v1 18/19] pinctrl: zynqmp: Unify pin naming Andy Shevchenko
2021-11-09 11:34 ` Linus Walleij
2021-11-05 12:42 ` [PATCH v1 19/19] gpio: mockup: Switch to use kasprintf_strarray() Andy Shevchenko
2021-11-09 11:35 ` Linus Walleij
2021-11-16 9:12 ` Bartosz Golaszewski
2021-11-06 7:34 ` [PATCH v1 01/19] lib/string_helpers: Introduce kasprintf_strarray() Joe Perches
2021-11-09 11:42 ` Linus Walleij
2021-11-15 11:23 ` Andy Shevchenko
2021-11-18 16:56 ` Andy Shevchenko
2021-11-18 20:30 ` Bartosz Golaszewski
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