diff options
Diffstat (limited to 'payloads/libpayload/include')
| -rw-r--r-- | payloads/libpayload/include/libpayload.h | 7 | ||||
| -rw-r--r-- | payloads/libpayload/include/strings.h | 35 |
2 files changed, 7 insertions, 35 deletions
diff --git a/payloads/libpayload/include/libpayload.h b/payloads/libpayload/include/libpayload.h index 781a41d354..c3ca123f1f 100644 --- a/payloads/libpayload/include/libpayload.h +++ b/payloads/libpayload/include/libpayload.h @@ -311,6 +311,13 @@ u8 bin2hex(u8 b); u8 hex2bin(u8 h); void hexdump(const void *memory, size_t length); void fatal(const char *msg) __attribute__ ((noreturn)); + +/* Count Leading Zeroes: clz(0) == 32, clz(0xf) == 28, clz(1 << 31) == 0 */ +static inline int clz(u32 x) { return x ? __builtin_clz(x) : sizeof(x) * 8; } +/* Integer binary logarithm (rounding down): log2(0) == -1, log2(5) == 2 */ +static inline int log2(u32 x) { return sizeof(x) * 8 - clz(x) - 1; } +/* Find First Set: __ffs(0xf) == 0, __ffs(0) == -1, __ffs(1 << 31) == 31 */ +static inline int __ffs(u32 x) { return log2(x & (u32)(-(s32)x)); } /** @} */ diff --git a/payloads/libpayload/include/strings.h b/payloads/libpayload/include/strings.h deleted file mode 100644 index 5beddc6a7f..0000000000 --- a/payloads/libpayload/include/strings.h +++ /dev/null @@ -1,35 +0,0 @@ -/* - * This file is part of the libpayload project. - * - * Copyright (C) 2011 secunet Security Networks AG - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#ifndef _STRINGS_H -#define _STRINGS_H - -int ffs(int i); - -#endif |