Mercurial > flash_v2

annotate packages/language/c/libc/stdlib/current/src/bsearch.cxx @ 210:d2c90368aeef

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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children
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1 //===========================================================================
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2 //
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3 // bsearch.cxx
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4 //
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5 // ANSI standard binary search function defined in section 7.10.5.1
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6 // of the standard
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7 //
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8 //===========================================================================
208
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9 //####ECOSGPLCOPYRIGHTBEGIN####
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10 // -------------------------------------------
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11 // This file is part of eCos, the Embedded Configurable Operating System.
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12 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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13 //
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14 // eCos is free software; you can redistribute it and/or modify it under
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15 // the terms of the GNU General Public License as published by the Free
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16 // Software Foundation; either version 2 or (at your option) any later version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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19 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License along
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24 // with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use macros
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28 // or inline functions from this file, or you compile this file and link it
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29 // with other works to produce a work based on this file, this file does not
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30 // by itself cause the resulting work to be covered by the GNU General Public
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31 // License. However the source code for this file must still be made available
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32 // in accordance with section (3) of the GNU General Public License.
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33 //
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34 // This exception does not invalidate any other reasons why a work based on
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35 // this file might be covered by the GNU General Public License.
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36 //
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37 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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38 // at http://sources.redhat.com/ecos/ecos-license/
208
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39 // -------------------------------------------
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40 //####ECOSGPLCOPYRIGHTEND####
115
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41 //===========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): jlarmour
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45 // Contributors:
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46 // Date: 2000-04-30
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47 // Purpose:
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48 // Description:
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49 // Usage:
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //===========================================================================
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54
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55 // CONFIGURATION
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56
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57 #include <pkgconf/libc_stdlib.h> // Configuration header
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58
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59 // INCLUDES
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60
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61 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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62 #include <cyg/infra/cyg_trac.h> // Tracing support
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63 #include <cyg/infra/cyg_ass.h> // Assertion support
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64 #include <stdlib.h> // Header for all stdlib functions
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65 // (like this one)
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66
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67 // TRACING
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68
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69 # if defined(CYGDBG_USE_TRACING) && \
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70 defined(CYGNUM_LIBC_BSEARCH_TRACE_LEVEL)
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71 static int bsearch_trace = CYGNUM_LIBC_BSEARCH_TRACE_LEVEL;
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72 # define TL1 (0 < bsearch_trace)
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73 # else
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74 # define TL1 (0)
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75 # endif
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76
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77
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78 // FUNCTIONS
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79
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80 externC void *
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81 bsearch( const void *key, const void *base, size_t nmemb, size_t size,
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82 __bsearch_comparison_fn_t compar )
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83 {
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84 CYG_REPORT_FUNCNAMETYPE( "bsearch", "returning %08x" );
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85
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86 CYG_REPORT_FUNCARG5( "key=%08x, base=%08x, nmemb=%d, size=%d, "
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87 "compar=%08x", key, base, nmemb, size, compar );
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88
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89 CYG_CHECK_DATA_PTR( key, "key is not a valid pointer!" );
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90 CYG_CHECK_DATA_PTR( base, "base is not a valid pointer!" );
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91 CYG_CHECK_FUNC_PTR( compar, "compar is not a valid function pointer!" );
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92
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93 CYG_ADDRESS current;
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94 size_t lower = 0;
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95 size_t upper = nmemb;
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96 size_t index;
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97 int result;
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98
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99 if (nmemb == 0 || size == 0)
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100 {
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101 CYG_TRACE2( TL1, "Warning! either nmemb (%d) or size (%d) is 0",
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102 nmemb, size );
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103 CYG_REPORT_RETVAL( NULL );
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104 return NULL;
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105 } // if
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106
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107 while (lower < upper)
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108 {
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109 index = (lower + upper) / 2;
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110 current = (CYG_ADDRESS) (((char *) base) + (index * size));
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111
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112 CYG_TRACE2( TL1, "About to call comparison function with "
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113 "key=%08x, current=%08x", key, current );
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114 result = compar (key, (void *) current);
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115 CYG_TRACE1( TL1, "Comparison function returned %d", result );
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116
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117 if (result < 0)
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118 upper = index;
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119 else if (result > 0)
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120 lower = index + 1;
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121 else
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122 {
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123 CYG_REPORT_RETVAL( current );
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124 return (void *)current;
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125 } // else
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126 } // while
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127
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128 CYG_REPORT_RETVAL( NULL );
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129 return NULL;
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130 } // bsearch()
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131
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132 // EOF bsearch.cxx