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LibC: Add ffs{,l,ll}

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Those are wrappers around AK::bit_scan_forward().
This commit is contained in:
demostanis 2022-09-10 18:15:57 +02:00 • committed by Linus Groh
parent aa788581f2
commit 09a2db89c9
2 changed files with 22 additions and 0 deletions
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19
Userland/Libraries/LibC/strings.cpp
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@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause * SPDX-License-Identifier: BSD-2-Clause
*/ */
#include <AK/BuiltinWrappers.h>
#include <assert.h> #include <assert.h>
#include <ctype.h> #include <ctype.h>
#include <string.h> #include <string.h>
@ -51,4 +52,22 @@ int strncasecmp(char const* s1, char const* s2, size_t n)
} while (--n); } while (--n);
return 0; return 0;
} }
// https://pubs.opengroup.org/onlinepubs/009696799/functions/ffs.html
int ffs(int i)
{
return bit_scan_forward(i);
}
// https://linux.die.net/man/3/ffsl (GNU extension)
int ffsl(long int i)
{
return bit_scan_forward(i);
}
// https://linux.die.net/man/3/ffsll (GNU extension)
int ffsll(long long int i)
{
return bit_scan_forward(i);
}
} }

3
Userland/Libraries/LibC/strings.h
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@ -15,5 +15,8 @@ int strcasecmp(char const*, char const*);
int strncasecmp(char const*, char const*, size_t); int strncasecmp(char const*, char const*, size_t);
void bzero(void*, size_t); void bzero(void*, size_t);
void bcopy(void const*, void*, size_t); void bcopy(void const*, void*, size_t);
int ffs(int);
int ffsl(long int);
int ffsll(long long int);
__END_DECLS __END_DECLS