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* Added execute permissions to files missed in conversion from CVS
author alexs
date Mon, 12 Oct 2009 02:26:09 +0100
parents d2c90368aeef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): jlarmour
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44 // Contributors:
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45 // Date: 2000-04-30
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46 // Purpose:
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47 // Description:
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48 // Usage:
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //========================================================================
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53
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54 // CONFIGURATION
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55
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56 #include <pkgconf/libc_stdlib.h> // Configuration header
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57
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58 // INCLUDES
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59
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60 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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61 #include <cyg/infra/cyg_ass.h> // Tracing support
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62 #include <cyg/infra/cyg_trac.h> // Tracing support
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63 #include <stdlib.h> // Main header for stdlib functions
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64 #include <string.h> // strchr(), strlen() and strncmp()
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65
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66
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67 // VARIABLES
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68
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69 externC char **environ; // standard definition of environ
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70
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71 // FUNCTIONS
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72
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73 extern char *
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74 getenv( const char *name )
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75 {
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76 // This function assumes the POSIX 1003.1 layout of the environment
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77 // in the environ variable, i.e. extern char **environ is a pointer
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78 // to an array of character pointers to the environment strings
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79 // (POSIX 3.1.2.2 and 2.6).
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80 //
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81 // getenv() searches the environment list for a string of the form
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82 // "name=value" (POSIX 4.6.1). The strings must have this form
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83 // (POSIX 2.6)
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84
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85 CYG_REPORT_FUNCNAMETYPE( "getenv", "returning %08x" );
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86
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87 CYG_PRECONDITION( name != NULL, "getenv() called with NULL string!" );
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88
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89 CYG_REPORT_FUNCARG1( "name=%s", name );
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90
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91 CYG_PRECONDITION( environ != NULL,
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92 "environ not set i.e. environ == NULL" );
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93
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94 CYG_CHECK_DATA_PTR( environ, "environ isn't a valid pointer!" );
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95
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96 CYG_CHECK_DATA_PTR( name, "name isn't a valid pointer!" );
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97
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98 // check name doesn't contain '='
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99 CYG_PRECONDITION( strchr(name, '=') == NULL,
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100 "name contains '='!" );
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101
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102 char **env_str_p;
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103 cyg_ucount32 len = strlen( name );
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104
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105 for (env_str_p = environ; *env_str_p != NULL; ++env_str_p ) {
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106
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107 CYG_CHECK_DATA_PTR( env_str_p,
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108 "current environment string isn't valid!" );
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109
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110 CYG_CHECK_DATA_PTR( *env_str_p,
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111 "current environment string isn't valid!" );
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112
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113 // do we have a match?
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114 if ( !strncmp(*env_str_p, name, len) ) {
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115 // but it could be just a prefix i.e. we could have
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116 // matched MYNAMEFRED when we're looking for just MYNAME, so:
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117
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118 if ( (*env_str_p)[len] == '=' ) {
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119 // we got a match
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120 CYG_REPORT_RETVAL( *env_str_p + len + 1 );
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121
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122 return (*env_str_p + len + 1);
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123 } // if
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124 } // if
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125
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126 // check the next pointer isn't NULL, as we're about to dereference
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127 // it
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128 CYG_ASSERT( env_str_p+1 != NULL,
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129 "environment contains a NULL pointer!" );
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130 } // for
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131
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132 CYG_REPORT_RETVAL( NULL );
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133 return NULL;
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134 } // getenv()
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135
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136 // EOF getenv.cxx