diff options
| -rw-r--r-- | libc/string/Makefile | 2 | ||||
| -rw-r--r-- | libc/string/string.c | 33 |
2 files changed, 34 insertions, 1 deletions
diff --git a/libc/string/Makefile b/libc/string/Makefile index 1c8c6283a..5a2aa3c04 100644 --- a/libc/string/Makefile +++ b/libc/string/Makefile @@ -27,7 +27,7 @@ LIBC=$(TOPDIR)libc.a MSRC=string.c MOBJ=strlen.o strcat.o strcpy.o strchr.o strcmp.o strncat.o strncpy.o \ strncmp.o strrchr.o strdup.o memcpy.o memccpy.o memset.o \ - memmove.o memcmp.o memchr.o + memmove.o memcmp.o memchr.o ffs.o MSRC1=index.c MOBJ1=index.o rindex.o diff --git a/libc/string/string.c b/libc/string/string.c index fdf848125..f77cf4c69 100644 --- a/libc/string/string.c +++ b/libc/string/string.c @@ -280,5 +280,38 @@ int memcmp(const void *s1, const void *s2, size_t len) #endif +/********************** Function memcmp ************************************/ + +#ifdef L_ffs +int ffs(int x) +{ + int r = 1; + + if (!x) + return 0; + if (!(x & 0xffff)) { + x >>= 16; + r += 16; + } + if (!(x & 0xff)) { + x >>= 8; + r += 8; + } + if (!(x & 0xf)) { + x >>= 4; + r += 4; + } + if (!(x & 3)) { + x >>= 2; + r += 2; + } + if (!(x & 1)) { + x >>= 1; + r += 1; + } + return r; +} +#endif + /********************** THE END ********************************************/ |