From b445152396cb6d4ff98f88f294ed00d5f0947cbd Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Thu, 18 Jul 2013 14:26:44 +0200 Subject: string: introduce memchr_inv Directly taken from Linux Kernel. Signed-off-by: Sascha Hauer --- lib/string.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) (limited to 'lib') diff --git a/lib/string.c b/lib/string.c index f544b23664..eeec137c9e 100644 --- a/lib/string.c +++ b/lib/string.c @@ -666,3 +666,62 @@ char *strim(char *s) return s; } EXPORT_SYMBOL(strim); + +static void *check_bytes8(const u8 *start, u8 value, unsigned int bytes) +{ + while (bytes) { + if (*start != value) + return (void *)start; + start++; + bytes--; + } + return NULL; +} + +/** + * memchr_inv - Find an unmatching character in an area of memory. + * @start: The memory area + * @c: Find a character other than c + * @bytes: The size of the area. + * + * returns the address of the first character other than @c, or %NULL + * if the whole buffer contains just @c. + */ +void *memchr_inv(const void *start, int c, size_t bytes) +{ + u8 value = c; + u64 value64; + unsigned int words, prefix; + + if (bytes <= 16) + return check_bytes8(start, value, bytes); + + value64 = value; + value64 |= value64 << 8; + value64 |= value64 << 16; + value64 |= value64 << 32; + + prefix = (unsigned long)start % 8; + if (prefix) { + u8 *r; + + prefix = 8 - prefix; + r = check_bytes8(start, value, prefix); + if (r) + return r; + start += prefix; + bytes -= prefix; + } + + words = bytes / 8; + + while (words) { + if (*(u64 *)start != value64) + return check_bytes8(start, value, 8); + start += 8; + words--; + } + + return check_bytes8(start, value, bytes % 8); +} +EXPORT_SYMBOL(memchr_inv); -- cgit v1.2.3