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annotate packages/language/c/libc/stdlib/current/src/bsearch.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children e0c0827131d1
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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 //===========================================================================
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9 //####COPYRIGHTBEGIN####
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10 //
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11 // -------------------------------------------
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12 // The contents of this file are subject to the Red Hat eCos Public License
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13 // Version 1.1 (the "License"); you may not use this file except in
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14 // compliance with the License. You may obtain a copy of the License at
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15 // http://www.redhat.com/
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16 //
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17 // Software distributed under the License is distributed on an "AS IS"
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18 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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19 // License for the specific language governing rights and limitations under
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20 // the License.
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21 //
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22 // The Original Code is eCos - Embedded Configurable Operating System,
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23 // released September 30, 1998.
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24 //
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25 // The Initial Developer of the Original Code is Red Hat.
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26 // Portions created by Red Hat are
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27 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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28 // All Rights Reserved.
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29 // -------------------------------------------
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30 //
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31 //####COPYRIGHTEND####
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32 //===========================================================================
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33 //#####DESCRIPTIONBEGIN####
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34 //
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35 // Author(s): jlarmour
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36 // Contributors:
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37 // Date: 2000-04-30
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38 // Purpose:
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39 // Description:
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40 // Usage:
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 //===========================================================================
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45
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46 // CONFIGURATION
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47
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48 #include <pkgconf/libc_stdlib.h> // Configuration header
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49
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50 // INCLUDES
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51
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52 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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53 #include <cyg/infra/cyg_trac.h> // Tracing support
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54 #include <cyg/infra/cyg_ass.h> // Assertion support
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55 #include <stdlib.h> // Header for all stdlib functions
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56 // (like this one)
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57
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58 // TRACING
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59
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60 # if defined(CYGDBG_USE_TRACING) && \
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61 defined(CYGNUM_LIBC_BSEARCH_TRACE_LEVEL)
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62 static int bsearch_trace = CYGNUM_LIBC_BSEARCH_TRACE_LEVEL;
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63 # define TL1 (0 < bsearch_trace)
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64 # else
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65 # define TL1 (0)
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66 # endif
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67
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68
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69 // FUNCTIONS
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70
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71 externC void *
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72 bsearch( const void *key, const void *base, size_t nmemb, size_t size,
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73 __bsearch_comparison_fn_t compar )
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74 {
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75 CYG_REPORT_FUNCNAMETYPE( "bsearch", "returning %08x" );
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76
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77 CYG_REPORT_FUNCARG5( "key=%08x, base=%08x, nmemb=%d, size=%d, "
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78 "compar=%08x", key, base, nmemb, size, compar );
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79
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80 CYG_CHECK_DATA_PTR( key, "key is not a valid pointer!" );
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81 CYG_CHECK_DATA_PTR( base, "base is not a valid pointer!" );
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82 CYG_CHECK_FUNC_PTR( compar, "compar is not a valid function pointer!" );
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83
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84 CYG_ADDRESS current;
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85 size_t lower = 0;
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86 size_t upper = nmemb;
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87 size_t index;
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88 int result;
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89
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90 if (nmemb == 0 || size == 0)
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91 {
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92 CYG_TRACE2( TL1, "Warning! either nmemb (%d) or size (%d) is 0",
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93 nmemb, size );
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94 CYG_REPORT_RETVAL( NULL );
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95 return NULL;
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96 } // if
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97
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98 while (lower < upper)
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99 {
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100 index = (lower + upper) / 2;
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101 current = (CYG_ADDRESS) (((char *) base) + (index * size));
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102
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103 CYG_TRACE2( TL1, "About to call comparison function with "
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104 "key=%08x, current=%08x", key, current );
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105 result = compar (key, (void *) current);
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106 CYG_TRACE1( TL1, "Comparison function returned %d", result );
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107
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108 if (result < 0)
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109 upper = index;
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110 else if (result > 0)
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111 lower = index + 1;
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112 else
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113 {
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114 CYG_REPORT_RETVAL( current );
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115 return (void *)current;
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116 } // else
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117 } // while
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118
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119 CYG_REPORT_RETVAL( NULL );
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120 return NULL;
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121 } // bsearch()
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122
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123 // EOF bsearch.cxx