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annotate packages/language/c/libc/stdlib/current/src/getenv.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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115
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1 //========================================================================
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2 //
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3 // getenv.cxx
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4 //
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5 // Implementation of the ISO C standard getenv() function
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6 //
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7 //========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors:
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36 // Date: 2000-04-30
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37 // Purpose:
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38 // Description:
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39 // Usage:
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //========================================================================
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44
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45 // CONFIGURATION
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46
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47 #include <pkgconf/libc_stdlib.h> // Configuration header
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48
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49 // INCLUDES
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50
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51 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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52 #include <cyg/infra/cyg_ass.h> // Tracing support
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53 #include <cyg/infra/cyg_trac.h> // Tracing support
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54 #include <stdlib.h> // Main header for stdlib functions
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55 #include <string.h> // strchr(), strlen() and strncmp()
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56
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57
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58 // VARIABLES
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59
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60 externC char **environ; // standard definition of environ
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61
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62 // FUNCTIONS
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63
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64 extern char *
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65 getenv( const char *name )
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66 {
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67 // This function assumes the POSIX 1003.1 layout of the environment
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68 // in the environ variable, i.e. extern char **environ is a pointer
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69 // to an array of character pointers to the environment strings
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70 // (POSIX 3.1.2.2 and 2.6).
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71 //
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72 // getenv() searches the environment list for a string of the form
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73 // "name=value" (POSIX 4.6.1). The strings must have this form
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74 // (POSIX 2.6)
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75
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76 CYG_REPORT_FUNCNAMETYPE( "getenv", "returning %08x" );
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77
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78 CYG_PRECONDITION( name != NULL, "getenv() called with NULL string!" );
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79
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80 CYG_REPORT_FUNCARG1( "name=%s", name );
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81
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82 CYG_PRECONDITION( environ != NULL,
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83 "environ not set i.e. environ == NULL" );
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84
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85 CYG_CHECK_DATA_PTR( environ, "environ isn't a valid pointer!" );
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86
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87 CYG_CHECK_DATA_PTR( name, "name isn't a valid pointer!" );
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88
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89 // check name doesn't contain '='
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90 CYG_PRECONDITION( strchr(name, '=') == NULL,
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91 "name contains '='!" );
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92
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93 char **env_str_p;
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94 cyg_ucount32 len = strlen( name );
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95
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96 for (env_str_p = environ; *env_str_p != NULL; ++env_str_p ) {
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97
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98 CYG_CHECK_DATA_PTR( env_str_p,
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99 "current environment string isn't valid!" );
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100
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101 CYG_CHECK_DATA_PTR( *env_str_p,
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102 "current environment string isn't valid!" );
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103
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104 // do we have a match?
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105 if ( !strncmp(*env_str_p, name, len) ) {
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106 // but it could be just a prefix i.e. we could have
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107 // matched MYNAMEFRED when we're looking for just MYNAME, so:
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108
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109 if ( (*env_str_p)[len] == '=' ) {
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110 // we got a match
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111 CYG_REPORT_RETVAL( *env_str_p + len + 1 );
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112
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113 return (*env_str_p + len + 1);
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114 } // if
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115 } // if
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116
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117 // check the next pointer isn't NULL, as we're about to dereference
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118 // it
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119 CYG_ASSERT( env_str_p+1 != NULL,
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120 "environment contains a NULL pointer!" );
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121 } // for
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122
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123 CYG_REPORT_RETVAL( NULL );
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124 return NULL;
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125 } // getenv()
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126
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127 // EOF getenv.cxx