commit 2b0ab2120becaa40b777e7c43bfa57cb0397e3a9
parent 60ab25645e64e5e054d9b101091e3b1abd87d36e
Author: Laurent Bercot <ska-skaware@skarnet.org>
Date: Tue, 5 Jan 2016 20:04:57 +0000
Add bitarray_first{clear,set}_skip (thx jjk)
version: rc for 2.3.9.0 after Makefile fix
Diffstat:
8 files changed, 60 insertions(+), 2 deletions(-)
diff --git a/doc/index.html b/doc/index.html
@@ -60,7 +60,7 @@ with a standard C development environment </li>
<h3> Download </h3>
<ul>
- <li> The current released version of skalibs is <a href="skalibs-2.3.8.3.tar.gz">2.3.8.3</a>. </li>
+ <li> The current released version of skalibs is <a href="skalibs-2.3.9.0.tar.gz">2.3.9.0</a>. </li>
<li> Alternatively, you can checkout a copy of the skalibs git repository:
<pre> git clone git://git.skarnet.org/skalibs </pre> </li>
</ul>
diff --git a/doc/libstddjb/bitarray.html b/doc/libstddjb/bitarray.html
@@ -123,10 +123,24 @@ the total number of bits. If all bits in <em>s</em> are set, <em>len</em> is ret
</p>
<p>
+<code> unsigned int bitarray_firstclear_skip (unsigned char const *s, unsigned int len, unsigned int skip) </code> <br />
+Like <tt>bitarray_firstclear</tt>, but the first <em>skip</em> bits are
+ignored: the function cannot return less than <em>skip</em>. It is a
+programming error if <em>skip</em> > <em>len</em>.
+</p>
+
+<p>
<code> unsigned int bitarray_firstset (unsigned char const *s, unsigned int len) </code> <br />
Returns the number of the first set bit in <em>s</em>, <em>len</em> being
the total number of bits. If all bits in <em>s</em> are clear, <em>len</em> is returned.
</p>
+<p>
+<code> unsigned int bitarray_firstset_skip (unsigned char const *s, unsigned int len, unsigned int skip) </code> <br />
+Like <tt>bitarray_firstset</tt>, but the first <em>skip</em> bits are
+ignored: the function cannot return less than <em>skip</em>. It is a
+programming error if <em>skip</em> > <em>len</em>.
+</p>
+
</body>
</html>
diff --git a/doc/upgrade.html b/doc/upgrade.html
@@ -18,6 +18,13 @@
<h1> What has changed in skalibs </h1>
+<h2> in 2.3.9.0 </h2>
+
+<ul>
+ <li> New functions: <tt>bitarray_firstclear_skip</tt> and
+<tt>bitarray_firstset_skip</tt>. </li>
+</ul>
+
<h2> in 2.3.8.3 </h2>
<ul>
diff --git a/package/deps.mak b/package/deps.mak
@@ -211,7 +211,9 @@ src/libstddjb/bitarray_and.o src/libstddjb/bitarray_and.lo: src/libstddjb/bitarr
src/libstddjb/bitarray_clearsetn.o src/libstddjb/bitarray_clearsetn.lo: src/libstddjb/bitarray_clearsetn.c src/include/skalibs/bitarray.h
src/libstddjb/bitarray_count.o src/libstddjb/bitarray_count.lo: src/libstddjb/bitarray_count.c src/include/skalibs/bitarray.h
src/libstddjb/bitarray_firstclear.o src/libstddjb/bitarray_firstclear.lo: src/libstddjb/bitarray_firstclear.c src/include/skalibs/bitarray.h
+src/libstddjb/bitarray_firstclear_skip.o src/libstddjb/bitarray_firstclear_skip.lo: src/libstddjb/bitarray_firstclear_skip.c src/include/skalibs/bitarray.h
src/libstddjb/bitarray_firstset.o src/libstddjb/bitarray_firstset.lo: src/libstddjb/bitarray_firstset.c src/include/skalibs/bitarray.h
+src/libstddjb/bitarray_firstset_skip.o src/libstddjb/bitarray_firstset_skip.lo: src/libstddjb/bitarray_firstset_skip.c src/include/skalibs/bitarray.h
src/libstddjb/bitarray_not.o src/libstddjb/bitarray_not.lo: src/libstddjb/bitarray_not.c src/include/skalibs/bitarray.h
src/libstddjb/bitarray_or.o src/libstddjb/bitarray_or.lo: src/libstddjb/bitarray_or.c src/include/skalibs/bitarray.h
src/libstddjb/bitarray_testandpoke.o src/libstddjb/bitarray_testandpoke.lo: src/libstddjb/bitarray_testandpoke.c src/include/skalibs/bitarray.h
diff --git a/package/info b/package/info
@@ -1,4 +1,4 @@
package=skalibs
-version=2.3.8.3
+version=2.3.9.0
category=prog
package_macro_name=SKALIBS
diff --git a/src/include/skalibs/bitarray.h b/src/include/skalibs/bitarray.h
@@ -24,6 +24,11 @@ extern int bitarray_testandpoke (unsigned char *, unsigned int, int) ;
extern unsigned int bitarray_firstclear (unsigned char const *, unsigned int) gccattr_pure ;
extern unsigned int bitarray_firstset (unsigned char const *, unsigned int) gccattr_pure ;
#define bitarray_first(s, n, h) ((h) ? bitarray_firstset(s, n) : bitarray_firstclear(s, n))
+
+extern unsigned int bitarray_firstclear_skip (unsigned char const *, unsigned int, unsigned int) gccattr_pure ;
+extern unsigned int bitarray_firstset_skip (unsigned char const *, unsigned int, unsigned int) gccattr_pure ;
+#define bitarray_first_skip(s, n, k, h) ((h) ? bitarray_firstset_skip(s, n, k) : bitarray_firstclear_skip(s, n, k))
+
extern unsigned int bitarray_countones (unsigned char const *, unsigned int) gccattr_pure ;
extern void bitarray_not (unsigned char *, unsigned int, unsigned int) ;
diff --git a/src/libstddjb/bitarray_firstclear_skip.c b/src/libstddjb/bitarray_firstclear_skip.c
@@ -0,0 +1,15 @@
+/* ISC license. */
+
+#include <skalibs/bitarray.h>
+
+unsigned int bitarray_firstclear_skip (register unsigned char const *s, unsigned int max, unsigned int skip)
+{
+ register unsigned int i = bitarray_div8(skip) ;
+ register unsigned int j = i << 3 > max ? max : i << 3 ;
+ if (i && s[i-1] != 0xffU)
+ {
+ while ((skip < j) && bitarray_peek(s, skip)) skip++ ;
+ if (skip < j) return skip ;
+ }
+ return j + bitarray_firstclear(s + i, max - j) ;
+}
diff --git a/src/libstddjb/bitarray_firstset_skip.c b/src/libstddjb/bitarray_firstset_skip.c
@@ -0,0 +1,15 @@
+/* ISC license. */
+
+#include <skalibs/bitarray.h>
+
+unsigned int bitarray_firstset_skip (register unsigned char const *s, unsigned int max, unsigned int skip)
+{
+ register unsigned int i = bitarray_div8(skip) ;
+ register unsigned int j = i << 3 > max ? max : i << 3 ;
+ if (i && s[i-1])
+ {
+ while ((skip < j) && !bitarray_peek(s, skip)) skip++ ;
+ if (skip < j) return skip ;
+ }
+ return j + bitarray_firstset(s + i, max - j) ;
+}
