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6e72370fd7
This imports licensing clarifications and updates as discussed on
samba-technical ("Subject: Re: ccan code breaks older build farm
systems").
In particular, the recent version have per-file license markers, and
some modules are relicenced more liberally: in particular Simo pointed
out that htable was GPL, and indirectly included by libtdb2, which
would have made that GPL as well.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Autobuild-User: Rusty Russell <rusty@rustcorp.com.au>
Autobuild-Date: Mon Jul 25 12:03:40 CEST 2011 on sn-devel-104
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
/**
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* ilog - Integer logarithm.
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*
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* ilog_32() and ilog_64() compute the minimum number of bits required to store
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* an unsigned 32-bit or 64-bit value without any leading zero bits.
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* This can also be thought of as the location of the highest set bit, with
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* counting starting from one (so that 0 returns 0, 1 returns 1, and 2**31
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* returns 32).
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* When the value is known to be non-zero ilog32_nz() and ilog64_nz() can
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* compile into as few as two instructions, one of which may get optimized out
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* later.
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* STATIC_ILOG_32 and STATIC_ILOG_64 allow computation on compile-time
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* constants, so other compile-time constants can be derived from them.
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*
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* Example:
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* #include <stdio.h>
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* #include <limits.h>
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* #include <ccan/ilog/ilog.h>
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*
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* int main(void){
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* int i;
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* printf("ilog32(0x%08X)=%i\n",0,ilog32(0));
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* for(i=1;i<=STATIC_ILOG_32(USHRT_MAX);i++){
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* uint32_t v;
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* v=(uint32_t)1U<<(i-1);
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* //Here we know v is non-zero, so we can use ilog32_nz().
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* printf("ilog32(0x%08X)=%i\n",v,ilog32_nz(v));
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* }
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* return 0;
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* }
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*
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* License: LGPL (v2.1 or any later version)
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* Author: Timothy B. Terriberry <tterribe@xiph.org>
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*/
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#include <string.h>
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#include <stdio.h>
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#include "config.h"
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int main(int _argc,const char *_argv[]){
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/*Expect exactly one argument.*/
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if(_argc!=2)return 1;
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if(strcmp(_argv[1],"depends")==0){
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printf("ccan/compiler\n");
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return 0;
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}
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return 1;
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}
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