Mercurial > ecos-v3_0-branch

annotate packages/language/c/libc/stdlib/current/src/bsearch.cxx @ 2863:7d8c61e6225c default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
* Added execute permissions to files missed in conversion from CVS
author alexs
date Thu, 26 Mar 2009 20:39:18 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1 //===========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
2 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
3 // bsearch.cxx
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
4 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
5 // ANSI standard binary search function defined in section 7.10.5.1
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
6 // of the standard
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
7 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
8 //===========================================================================
2729
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
9 // ####ECOSGPLCOPYRIGHTBEGIN####
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
10 // -------------------------------------------
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
11 // This file is part of eCos, the Embedded Configurable Operating System.
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
12 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 115
diff changeset
13 //
2729
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
14 // eCos is free software; you can redistribute it and/or modify it under
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
15 // the terms of the GNU General Public License as published by the Free
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
16 // Software Foundation; either version 2 or (at your option) any later
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
17 // version.
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 115
diff changeset
18 //
2729
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
19 // eCos is distributed in the hope that it will be useful, but WITHOUT
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
20 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
21 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
22 // for more details.
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 115
diff changeset
23 //
2729
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
24 // You should have received a copy of the GNU General Public License
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
25 // along with eCos; if not, write to the Free Software Foundation, Inc.,
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
26 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 115
diff changeset
27 //
2729
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
28 // As a special exception, if other files instantiate templates or use
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
29 // macros or inline functions from this file, or you compile this file
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
30 // and link it with other works to produce a work based on this file,
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
31 // this file does not by itself cause the resulting work to be covered by
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
32 // the GNU General Public License. However the source code for this file
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
33 // must still be made available in accordance with section (3) of the GNU
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
34 // General Public License v2.
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents: 115
diff changeset
35 //
2729
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
36 // This exception does not invalidate any other reasons why a work based
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
37 // on this file might be covered by the GNU General Public License.
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
38 // -------------------------------------------
74dbf4c3f2e1 Update all copyright banners to reflect FSF ownership; fix and improve licence text.
jlarmour
parents: 210
diff changeset
39 // ####ECOSGPLCOPYRIGHTEND####
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
40 //===========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
41 //#####DESCRIPTIONBEGIN####
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
42 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
43 // Author(s): jlarmour
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
44 // Contributors:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
45 // Date: 2000-04-30
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
46 // Purpose:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
47 // Description:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
48 // Usage:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
49 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
50 //####DESCRIPTIONEND####
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
51 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
52 //===========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
53
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
54 // CONFIGURATION
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
55
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
56 #include <pkgconf/libc_stdlib.h> // Configuration header
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
57
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
58 // INCLUDES
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
59
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
60 #include <cyg/infra/cyg_type.h> // Common type definitions and support
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
61 #include <cyg/infra/cyg_trac.h> // Tracing support
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
62 #include <cyg/infra/cyg_ass.h> // Assertion support
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
63 #include <stdlib.h> // Header for all stdlib functions
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
64 // (like this one)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
65
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
66 // TRACING
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
67
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
68 # if defined(CYGDBG_USE_TRACING) && \
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
69 defined(CYGNUM_LIBC_BSEARCH_TRACE_LEVEL)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
70 static int bsearch_trace = CYGNUM_LIBC_BSEARCH_TRACE_LEVEL;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
71 # define TL1 (0 < bsearch_trace)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
72 # else
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
73 # define TL1 (0)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
74 # endif
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
75
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
76
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
77 // FUNCTIONS
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
78
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
79 externC void *
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
80 bsearch( const void *key, const void *base, size_t nmemb, size_t size,
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
81 __bsearch_comparison_fn_t compar )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
82 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
83 CYG_REPORT_FUNCNAMETYPE( "bsearch", "returning %08x" );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
84
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
85 CYG_REPORT_FUNCARG5( "key=%08x, base=%08x, nmemb=%d, size=%d, "
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
86 "compar=%08x", key, base, nmemb, size, compar );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
87
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
88 CYG_CHECK_DATA_PTR( key, "key is not a valid pointer!" );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
89 CYG_CHECK_DATA_PTR( base, "base is not a valid pointer!" );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
90 CYG_CHECK_FUNC_PTR( compar, "compar is not a valid function pointer!" );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
91
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
92 CYG_ADDRESS current;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
93 size_t lower = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
94 size_t upper = nmemb;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
95 size_t index;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
96 int result;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
97
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
98 if (nmemb == 0 || size == 0)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
99 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
100 CYG_TRACE2( TL1, "Warning! either nmemb (%d) or size (%d) is 0",
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
101 nmemb, size );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
102 CYG_REPORT_RETVAL( NULL );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
103 return NULL;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
104 } // if
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
105
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
106 while (lower < upper)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
107 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
108 index = (lower + upper) / 2;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
109 current = (CYG_ADDRESS) (((char *) base) + (index * size));
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
110
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
111 CYG_TRACE2( TL1, "About to call comparison function with "
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
112 "key=%08x, current=%08x", key, current );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
113 result = compar (key, (void *) current);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
114 CYG_TRACE1( TL1, "Comparison function returned %d", result );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
116 if (result < 0)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
117 upper = index;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
118 else if (result > 0)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
119 lower = index + 1;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
120 else
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
121 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
122 CYG_REPORT_RETVAL( current );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
123 return (void *)current;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
124 } // else
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
125 } // while
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
126
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
127 CYG_REPORT_RETVAL( NULL );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
128 return NULL;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
129 } // bsearch()
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
130
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
131 // EOF bsearch.cxx