diff options
| -rw-r--r-- | lib/Makefile | 2 | ||||
| -rw-r--r-- | lib/memcat_p.c | 34 | ||||
| -rw-r--r-- | lib/string.c | 30 | ||||
| -rw-r--r-- | lib/test_memcat_p.c | 2 |
4 files changed, 36 insertions, 32 deletions
diff --git a/lib/Makefile b/lib/Makefile index c2588a2d7b1e70..40e79f88c3cdd1 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -24,7 +24,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \ flex_proportions.o ratelimit.o show_mem.o \ is_single_threaded.o plist.o decompress.o kobject_uevent.o \ earlycpio.o seq_buf.o siphash.o dec_and_lock.o \ - nmi_backtrace.o nodemask.o win_minmax.o + nmi_backtrace.o nodemask.o win_minmax.o memcat_p.o lib-$(CONFIG_PRINTK) += dump_stack.o lib-$(CONFIG_MMU) += ioremap.o diff --git a/lib/memcat_p.c b/lib/memcat_p.c new file mode 100644 index 00000000000000..b810fbc66962f7 --- /dev/null +++ b/lib/memcat_p.c @@ -0,0 +1,34 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/slab.h> + +/* + * Merge two NULL-terminated pointer arrays into a newly allocated + * array, which is also NULL-terminated. Nomenclature is inspired by + * memset_p() and memcat() found elsewhere in the kernel source tree. + */ +void **__memcat_p(void **a, void **b) +{ + void **p = a, **new; + int nr; + + /* count the elements in both arrays */ + for (nr = 0, p = a; *p; nr++, p++) + ; + for (p = b; *p; nr++, p++) + ; + /* one for the NULL-terminator */ + nr++; + + new = kmalloc_array(nr, sizeof(void *), GFP_KERNEL); + if (!new) + return NULL; + + /* nr -> last index; p points to NULL in b[] */ + for (nr--; nr >= 0; nr--, p = p == b ? &a[nr] : p - 1) + new[nr] = *p; + + return new; +} +EXPORT_SYMBOL_GPL(__memcat_p); + diff --git a/lib/string.c b/lib/string.c index 453f35994eb6eb..38e4ca08e757cb 100644 --- a/lib/string.c +++ b/lib/string.c @@ -891,36 +891,6 @@ void *memscan(void *addr, int c, size_t size) EXPORT_SYMBOL(memscan); #endif -/* - * Merge two NULL-terminated pointer arrays into a newly allocated - * array, which is also NULL-terminated. Nomenclature is inspired by - * memset_p() and memcat() found elsewhere in the kernel source tree. - */ -void **__memcat_p(void **a, void **b) -{ - void **p = a, **new; - int nr; - - /* count the elements in both arrays */ - for (nr = 0, p = a; *p; nr++, p++) - ; - for (p = b; *p; nr++, p++) - ; - /* one for the NULL-terminator */ - nr++; - - new = kmalloc_array(nr, sizeof(void *), GFP_KERNEL); - if (!new) - return NULL; - - /* nr -> last index; p points to NULL in b[] */ - for (nr--; nr >= 0; nr--, p = p == b ? &a[nr] : p - 1) - new[nr] = *p; - - return new; -} -EXPORT_SYMBOL_GPL(__memcat_p); - #ifndef __HAVE_ARCH_STRSTR /** * strstr - Find the first substring in a %NUL terminated string diff --git a/lib/test_memcat_p.c b/lib/test_memcat_p.c index 2b163a749ecb20..849c477d49d0cd 100644 --- a/lib/test_memcat_p.c +++ b/lib/test_memcat_p.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Test cases for memcat_p() in lib/string.c + * Test cases for memcat_p() in lib/memcat_p.c */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |