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annotate lib/search.in.h @ 10375:f96e845fc36d

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Avoid some "gcc -pedantic" warnings.
author Bruno Haible <bruno@clisp.org>
date Sat, 30 Aug 2008 03:09:15 +0200
parents 53dc0fa4233a
children 8668b19a7032
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1 /* A GNU-like <search.h>.
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2
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3 Copyright (C) 2007-2008 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 #ifndef _GL_SEARCH_H
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19
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20 /* The include_next requires a split double-inclusion guard. */
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21 #if @HAVE_SEARCH_H@
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22 @PRAGMA_SYSTEM_HEADER@
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23 # @INCLUDE_NEXT@ @NEXT_SEARCH_H@
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24 #endif
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25
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26 #ifndef _GL_SEARCH_H
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27 #define _GL_SEARCH_H
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29
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30 /* The definition of GL_LINK_WARNING is copied here. */
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31
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32
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33 #ifdef __cplusplus
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34 extern "C" {
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35 #endif
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36
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37
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38 #if @GNULIB_TSEARCH@
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39 # if @REPLACE_TSEARCH@
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40 # define tsearch rpl_tsearch
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41 # define tfind rpl_tfind
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42 # define tdelete rpl_tdelete
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43 # define twalk rpl_twalk
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44 # endif
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45 # if !@HAVE_TSEARCH@ || @REPLACE_TSEARCH@
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46
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47 /* See <http://www.opengroup.org/susv3xbd/search.h.html>,
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48 <http://www.opengroup.org/susv3xsh/tsearch.html>
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49 for details. */
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50
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51 # if !@HAVE_TSEARCH@
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52 typedef enum
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53 {
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54 preorder,
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55 postorder,
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56 endorder,
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57 leaf
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58 }
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59 VISIT;
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60 # endif
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61
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62 /* Searches an element in the tree *VROOTP that compares equal to KEY.
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63 If one is found, it is returned. Otherwise, a new element equal to KEY
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64 is inserted in the tree and is returned. */
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65 extern void * tsearch (const void *key, void **vrootp,
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66 int (*compar) (const void *, const void *));
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67
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68 /* Searches an element in the tree *VROOTP that compares equal to KEY.
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69 If one is found, it is returned. Otherwise, NULL is returned. */
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70 extern void * tfind (const void *key, void *const *vrootp,
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71 int (*compar) (const void *, const void *));
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72
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73 /* Searches an element in the tree *VROOTP that compares equal to KEY.
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74 If one is found, it is removed from the tree, and its parent node is
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75 returned. Otherwise, NULL is returned. */
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76 extern void * tdelete (const void *key, void **vrootp,
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77 int (*compar) (const void *, const void *));
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78
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79 /* Perform a depth-first, left-to-right traversal of the tree VROOT.
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80 The ACTION function is called:
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81 - for non-leaf nodes: 3 times, before the left subtree traversal,
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82 after the left subtree traversal but before the right subtree traversal,
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83 and after the right subtree traversal,
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84 - for leaf nodes: once.
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85 The arguments passed to ACTION are:
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86 1. the node; it can be casted to a 'const void * const *', i.e. into a
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87 pointer to the key,
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88 2. an indicator which visit of the node this is,
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89 3. the level of the node in the tree (0 for the root). */
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90 extern void twalk (const void *vroot,
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91 void (*action) (const void *, VISIT, int));
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92
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93 # endif
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94 #elif defined GNULIB_POSIXCHECK
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95 # undef tsearch
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96 # define tsearch(k,v,c) \
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97 (GL_LINK_WARNING ("tsearch is unportable - " \
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98 "use gnulib module tsearch for portability"), \
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99 tsearch (k, v, c))
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100 # undef tfind
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101 # define tfind(k,v,c) \
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102 (GL_LINK_WARNING ("tfind is unportable - " \
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103 "use gnulib module tsearch for portability"), \
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104 tfind (k, v, c))
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105 # undef tdelete
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106 # define tdelete(k,v,c) \
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107 (GL_LINK_WARNING ("tdelete is unportable - " \
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108 "use gnulib module tsearch for portability"), \
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109 tdelete (k, v, c))
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110 # undef twalk
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111 # define twalk(v,a) \
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112 (GL_LINK_WARNING ("twalk is unportable - " \
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113 "use gnulib module tsearch for portability"), \
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114 twalk (v, a))
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115 #endif
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116
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117
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118 #ifdef __cplusplus
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119 }
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120 #endif
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121
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122 #endif /* _GL_SEARCH_H */
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123 #endif /* _GL_SEARCH_H */