| 1 | /* File: vms_export_symbol.c
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| 2 | *
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| 3 | * Some programs need special environment variables deported as DCL
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| 4 | * DCL symbols.
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| 5 | */
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| 6 |
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| 7 | /* Copyright (C) 2014-2016 Free Software Foundation, Inc.
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| 8 |
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| 9 | GNU Make is free software; you can redistribute it and/or modify it under the
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| 10 | terms of the GNU General Public License as published by the Free Software
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| 11 | Foundation; either version 3 of the License, or (at your option) any later
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| 12 | version.
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| 13 |
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| 14 | GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
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| 15 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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| 16 | A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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| 17 |
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| 18 | You should have received a copy of the GNU General Public License along with
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| 19 | this program. If not, see <http://www.gnu.org/licenses/>. */
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| 20 |
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| 21 |
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| 22 | /* Per copyright assignment agreement with the Free Software Foundation
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| 23 | this software may be available under under other license agreements
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| 24 | and copyrights. */
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| 25 |
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| 26 |
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| 27 | #include <stdio.h>
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| 28 | #include <string.h>
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| 29 | #include <stdlib.h>
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| 30 | #include <errno.h>
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| 31 |
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| 32 | #include <descrip.h>
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| 33 | #include <stsdef.h>
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| 34 | #include <ssdef.h>
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| 35 | #include <unixlib.h>
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| 36 | #include <libclidef.h>
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| 37 |
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| 38 | #pragma member_alignment save
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| 39 | #pragma nomember_alignment longword
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| 40 | struct item_list_3
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| 41 | {
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| 42 | unsigned short len;
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| 43 | unsigned short code;
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| 44 | void * bufadr;
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| 45 | unsigned short * retlen;
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| 46 | };
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| 47 |
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| 48 |
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| 49 | #pragma member_alignment
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| 50 |
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| 51 | int
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| 52 | LIB$GET_SYMBOL (const struct dsc$descriptor_s * symbol,
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| 53 | struct dsc$descriptor_s * value,
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| 54 | unsigned short * value_len,
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| 55 | const unsigned long * table);
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| 56 |
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| 57 | int
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| 58 | LIB$SET_SYMBOL (const struct dsc$descriptor_s * symbol,
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| 59 | const struct dsc$descriptor_s * value,
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| 60 | const unsigned long * table);
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| 61 |
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| 62 | int
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| 63 | LIB$DELETE_SYMBOL (const struct dsc$descriptor_s * symbol,
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| 64 | const unsigned long * table);
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| 65 |
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| 66 | #define MAX_DCL_SYMBOL_LEN (255)
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| 67 | #if __CRTL_VER >= 70302000 && !defined(__VAX)
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| 68 | # define MAX_DCL_SYMBOL_VALUE (8192)
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| 69 | #else
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| 70 | # define MAX_DCL_SYMBOL_VALUE (1024)
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| 71 | #endif
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| 72 |
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| 73 | struct dcl_symbol
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| 74 | {
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| 75 | struct dcl_symbol * link;
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| 76 | struct dsc$descriptor_s name_desc;
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| 77 | struct dsc$descriptor_s value_desc;
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| 78 | char name[MAX_DCL_SYMBOL_LEN + 1]; /* + 1 byte for null terminator */
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| 79 | char value[MAX_DCL_SYMBOL_VALUE +1]; /* + 1 byte for null terminator */
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| 80 | char pad[3]; /* Pad structure to longword allignment */
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| 81 | };
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| 82 |
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| 83 | static struct dcl_symbol * vms_dcl_symbol_head = NULL;
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| 84 |
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| 85 | /* Restore symbol state to original condition. */
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| 86 | static unsigned long
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| 87 | clear_dcl_symbol (struct dcl_symbol * symbol)
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| 88 | {
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| 89 |
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| 90 | const unsigned long symtbl = LIB$K_CLI_LOCAL_SYM;
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| 91 | int status;
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| 92 |
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| 93 | if (symbol->value_desc.dsc$w_length == (unsigned short)-1)
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| 94 | status = LIB$DELETE_SYMBOL (&symbol->name_desc, &symtbl);
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| 95 | else
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| 96 | status = LIB$SET_SYMBOL (&symbol->name_desc,
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| 97 | &symbol->value_desc, &symtbl);
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| 98 | return status;
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| 99 | }
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| 100 |
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| 101 |
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| 102 | /* Restore all exported symbols to their original conditions */
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| 103 | static void
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| 104 | clear_exported_symbols (void)
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| 105 | {
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| 106 |
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| 107 | struct dcl_symbol * symbol;
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| 108 |
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| 109 | symbol = vms_dcl_symbol_head;
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| 110 |
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| 111 | /* Walk the list of symbols. This is done durring exit,
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| 112 | * so no need to free memory.
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| 113 | */
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| 114 | while (symbol != NULL)
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| 115 | {
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| 116 | clear_dcl_symbol (symbol);
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| 117 | symbol = symbol->link;
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| 118 | }
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| 119 |
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| 120 | }
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| 121 |
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| 122 |
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| 123 | /* Restore the symbol back to the original value
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| 124 | * symbol name is either a plain name or of the form "symbol=name" where
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| 125 | * the name portion is ignored.
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| 126 | */
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| 127 | void
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| 128 | vms_restore_symbol (const char * string)
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| 129 | {
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| 130 |
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| 131 | struct dcl_symbol * symbol;
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| 132 | char name[MAX_DCL_SYMBOL_LEN + 1];
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| 133 | int status;
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| 134 | char * value;
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| 135 | int name_len;
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| 136 |
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| 137 | symbol = vms_dcl_symbol_head;
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| 138 |
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| 139 | /* Isolate the name from the value */
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| 140 | value = strchr (string, '=');
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| 141 | if (value != NULL)
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| 142 | {
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| 143 | /* Copy the name from the string */
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| 144 | name_len = (value - string);
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| 145 | }
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| 146 | else
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| 147 | name_len = strlen (string);
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| 148 |
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| 149 | if (name_len > MAX_DCL_SYMBOL_LEN)
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| 150 | name_len = MAX_DCL_SYMBOL_LEN;
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| 151 |
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| 152 | strncpy (name, string, name_len);
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| 153 | name[name_len] = 0;
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| 154 |
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| 155 | /* Walk the list of symbols. The saved symbol is not freed
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| 156 | * symbols are likely to be overwritten multiple times, so this
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| 157 | * saves time in saving them each time.
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| 158 | */
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| 159 | while (symbol != NULL)
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| 160 | {
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| 161 | int result;
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| 162 | result = strcmp (symbol->name, name);
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| 163 | if (result == 0)
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| 164 | {
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| 165 | clear_dcl_symbol (symbol);
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| 166 | break;
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| 167 | }
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| 168 | symbol = symbol->link;
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| 169 | }
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| 170 | }
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| 171 |
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| 172 | int
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| 173 | vms_export_dcl_symbol (const char * name, const char * value)
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| 174 | {
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| 175 |
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| 176 | struct dcl_symbol * symbol;
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| 177 | struct dcl_symbol * next;
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| 178 | struct dcl_symbol * link;
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| 179 | int found;
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| 180 | const unsigned long symtbl = LIB$K_CLI_LOCAL_SYM;
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| 181 | struct dsc$descriptor_s value_desc;
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| 182 | int string_len;
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| 183 | int status;
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| 184 | char new_value[MAX_DCL_SYMBOL_VALUE + 1];
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| 185 | char * dollarp;
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| 186 |
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| 187 | next = vms_dcl_symbol_head;
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| 188 | link = vms_dcl_symbol_head;
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| 189 |
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| 190 | /* Is symbol already exported? */
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| 191 | found = 0;
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| 192 | while ((found == 0) && (link != NULL))
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| 193 | {
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| 194 | int x;
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| 195 | found = !strncasecmp (link->name, name, MAX_DCL_SYMBOL_LEN);
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| 196 | if (found)
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| 197 | symbol = link;
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| 198 | next = link;
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| 199 | link = link->link;
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| 200 | }
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| 201 |
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| 202 | /* New symbol, set it up */
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| 203 | if (found == 0)
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| 204 | {
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| 205 | symbol = malloc (sizeof (struct dcl_symbol));
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| 206 | if (symbol == NULL)
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| 207 | return SS$_INSFMEM;
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| 208 |
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| 209 | /* Construct the symbol descriptor, used for both saving
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| 210 | * the old symbol and creating the new symbol.
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| 211 | */
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| 212 | symbol->name_desc.dsc$w_length = strlen (name);
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| 213 | if (symbol->name_desc.dsc$w_length > MAX_DCL_SYMBOL_LEN)
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| 214 | symbol->name_desc.dsc$w_length = MAX_DCL_SYMBOL_LEN;
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| 215 |
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| 216 | strncpy (symbol->name, name, symbol->name_desc.dsc$w_length);
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| 217 | symbol->name[symbol->name_desc.dsc$w_length] = 0;
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| 218 | symbol->name_desc.dsc$a_pointer = symbol->name;
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| 219 | symbol->name_desc.dsc$b_dtype = DSC$K_DTYPE_T;
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| 220 | symbol->name_desc.dsc$b_class = DSC$K_CLASS_S;
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| 221 |
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| 222 | /* construct the value descriptor, used only for saving
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| 223 | * the old symbol.
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| 224 | */
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| 225 | symbol->value_desc.dsc$a_pointer = symbol->value;
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| 226 | symbol->value_desc.dsc$w_length = MAX_DCL_SYMBOL_VALUE;
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| 227 | symbol->value_desc.dsc$b_dtype = DSC$K_DTYPE_T;
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| 228 | symbol->value_desc.dsc$b_class = DSC$K_CLASS_S;
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| 229 | }
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| 230 |
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| 231 | if (found == 0)
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| 232 | {
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| 233 | unsigned long old_symtbl;
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| 234 | unsigned short value_len;
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| 235 |
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| 236 | /* Look up the symbol */
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| 237 | status = LIB$GET_SYMBOL (&symbol->name_desc, &symbol->value_desc,
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| 238 | &value_len, &old_symtbl);
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| 239 | if (!$VMS_STATUS_SUCCESS (status))
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| 240 | value_len = (unsigned short)-1;
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| 241 | else if (old_symtbl != symtbl)
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| 242 | value_len = (unsigned short)-1;
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| 243 |
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| 244 | symbol->value_desc.dsc$w_length = value_len;
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| 245 |
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| 246 | /* Store it away */
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| 247 | if (value_len != (unsigned short) -1)
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| 248 | symbol->value[value_len] = 0;
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| 249 |
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| 250 | /* Make sure atexit scheduled */
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| 251 | if (vms_dcl_symbol_head == NULL)
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| 252 | {
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| 253 | vms_dcl_symbol_head = symbol;
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| 254 | atexit (clear_exported_symbols);
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| 255 | }
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| 256 | else
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| 257 | {
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| 258 | /* Extend the chain */
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| 259 | next->link = symbol;
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| 260 | }
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| 261 | }
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| 262 |
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| 263 | /* Create or replace a symbol */
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| 264 | value_desc.dsc$a_pointer = new_value;
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| 265 | string_len = strlen (value);
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| 266 | if (string_len > MAX_DCL_SYMBOL_VALUE)
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| 267 | string_len = MAX_DCL_SYMBOL_VALUE;
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| 268 |
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| 269 | strncpy (new_value, value, string_len);
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| 270 | new_value[string_len] = 0;
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| 271 |
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| 272 | /* Special handling for GNU Make. GNU Make doubles the dollar signs
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| 273 | * in environment variables read in from getenv(). Make exports symbols
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| 274 | * with the dollar signs already doubled. So all $$ must be converted
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| 275 | * back to $.
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| 276 | * If the first $ is not doubled, then do not convert at all.
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| 277 | */
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| 278 | dollarp = strchr (new_value, '$');
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| 279 | while (dollarp && dollarp[1] == '$')
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| 280 | {
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| 281 | int left;
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| 282 | dollarp++;
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| 283 | left = string_len - (dollarp - new_value - 1);
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| 284 | string_len--;
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| 285 | if (left > 0)
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| 286 | {
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| 287 | memmove (dollarp, &dollarp[1], left);
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| 288 | dollarp = strchr (&dollarp[1], '$');
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| 289 | }
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| 290 | else
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| 291 | {
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| 292 | /* Ended with $$, simple case */
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| 293 | dollarp[1] = 0;
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| 294 | break;
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| 295 | }
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| 296 | }
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| 297 | value_desc.dsc$w_length = string_len;
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| 298 | value_desc.dsc$b_dtype = DSC$K_DTYPE_T;
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| 299 | value_desc.dsc$b_class = DSC$K_CLASS_S;
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| 300 | status = LIB$SET_SYMBOL (&symbol->name_desc, &value_desc, &symtbl);
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| 301 | return status;
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| 302 | }
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| 303 |
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| 304 | /* export a DCL symbol using a string in the same syntax as putenv */
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| 305 | int
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| 306 | vms_putenv_symbol (const char * string)
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| 307 | {
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| 308 |
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| 309 | char name[MAX_DCL_SYMBOL_LEN + 1];
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| 310 | int status;
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| 311 | char * value;
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| 312 | int name_len;
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| 313 |
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| 314 | /* Isolate the name from the value */
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| 315 | value = strchr (string, '=');
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| 316 | if (value == NULL)
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| 317 | {
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| 318 | errno = EINVAL;
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| 319 | return -1;
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| 320 | }
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| 321 |
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| 322 | /* Copy the name from the string */
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| 323 | name_len = (value - string);
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| 324 | if (name_len > MAX_DCL_SYMBOL_LEN)
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| 325 | name_len = MAX_DCL_SYMBOL_LEN;
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| 326 |
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| 327 | strncpy (name, string, name_len);
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| 328 | name[name_len] = 0;
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| 329 |
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| 330 | /* Skip past the "=" */
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| 331 | value++;
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| 332 |
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| 333 | /* Export the symbol */
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| 334 | status = vms_export_dcl_symbol (name, value);
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| 335 |
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| 336 | /* Convert the error to Unix format */
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| 337 | if (!$VMS_STATUS_SUCCESS (status))
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| 338 | {
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| 339 | errno = EVMSERR;
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| 340 | vaxc$errno = status;
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| 341 | return -1;
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| 342 | }
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| 343 | return 0;
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| 344 | }
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| 345 |
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| 346 | #if __CRTL_VER >= 70301000
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| 347 | # define transpath_parm transpath
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| 348 | #else
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| 349 | static char transpath[MAX_DCL_SYMBOL_VALUE];
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| 350 | #endif
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| 351 |
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| 352 | /* Helper callback routine for converting Unix paths to VMS */
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| 353 | static int
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| 354 | to_vms_action (char * vms_spec, int flag, char * transpath_parm)
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| 355 | {
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| 356 | strncpy (transpath, vms_spec, MAX_DCL_SYMBOL_VALUE - 1);
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| 357 | transpath[MAX_DCL_SYMBOL_VALUE - 1] = 0;
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| 358 | return 0;
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| 359 | }
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| 360 |
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| 361 | #ifdef __DECC
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| 362 | # pragma message save
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| 363 | /* Undocumented extra parameter use triggers a ptrmismatch warning */
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| 364 | # pragma message disable ptrmismatch
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| 365 | #endif
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| 366 |
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| 367 | /* Create a foreign command only visible to children */
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| 368 | int
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| 369 | create_foreign_command (const char * command, const char * image)
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| 370 | {
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| 371 | char vms_command[MAX_DCL_SYMBOL_VALUE + 1];
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| 372 | int status;
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| 373 |
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| 374 | vms_command[0] = '$';
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| 375 | vms_command[1] = 0;
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| 376 | if (image[0] == '/')
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| 377 | {
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| 378 | #if __CRTL_VER >= 70301000
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| 379 | /* Current decc$to_vms is reentrant */
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| 380 | decc$to_vms (image, to_vms_action, 0, 1, &vms_command[1]);
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| 381 | #else
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| 382 | /* Older decc$to_vms is not reentrant */
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| 383 | decc$to_vms (image, to_vms_action, 0, 1);
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| 384 | strncpy (&vms_command[1], transpath, MAX_DCL_SYMBOL_VALUE - 1);
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| 385 | vms_command[MAX_DCL_SYMBOL_VALUE] = 0;
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| 386 | #endif
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| 387 | }
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| 388 | else
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| 389 | {
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| 390 | strncpy (&vms_command[1], image, MAX_DCL_SYMBOL_VALUE - 1);
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| 391 | vms_command[MAX_DCL_SYMBOL_VALUE] = 0;
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| 392 | }
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| 393 | status = vms_export_dcl_symbol (command, vms_command);
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| 394 |
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| 395 | return status;
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| 396 | }
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| 397 | #ifdef __DECC
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| 398 | # pragma message restore
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| 399 | #endif
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| 400 |
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| 401 |
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| 402 | #ifdef DEBUG
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| 403 |
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| 404 | int
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| 405 | main(int argc, char ** argv, char **env)
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| 406 | {
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| 407 |
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| 408 | char value[MAX_DCL_SYMBOL_VALUE +1];
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| 409 | int status = 0;
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| 410 | int putenv_status;
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| 411 | int vms_status;
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| 412 | struct dsc$descriptor_s name_desc;
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| 413 | struct dsc$descriptor_s value_desc;
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| 414 | const unsigned long symtbl = LIB$K_CLI_LOCAL_SYM;
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| 415 | unsigned short value_len;
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| 416 | unsigned long old_symtbl;
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| 417 | int result;
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| 418 | const char * vms_command = "vms_export_symbol";
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| 419 | const char * vms_image = "test_image.exe";
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| 420 | const char * vms_symbol1 = "test_symbol1";
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| 421 | const char * value1 = "test_value1";
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| 422 | const char * vms_symbol2 = "test_symbol2";
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| 423 | const char * putenv_string = "test_symbol2=value2";
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| 424 | const char * value2 = "value2";
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| 425 |
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| 426 | /* Test creating a foreign command */
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| 427 | vms_status = create_foreign_command (vms_command, vms_image);
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| 428 | if (!$VMS_STATUS_SUCCESS (vms_status))
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| 429 | {
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| 430 | printf("Create foreign command failed: %d\n", vms_status);
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| 431 | status = 1;
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| 432 | }
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| 433 |
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| 434 | name_desc.dsc$a_pointer = (char *)vms_command;
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| 435 | name_desc.dsc$w_length = strlen (vms_command);
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| 436 | name_desc.dsc$b_dtype = DSC$K_DTYPE_T;
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| 437 | name_desc.dsc$b_class = DSC$K_CLASS_S;
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| 438 |
|
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| 439 | value_desc.dsc$a_pointer = value;
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| 440 | value_desc.dsc$w_length = MAX_DCL_SYMBOL_VALUE;
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| 441 | value_desc.dsc$b_dtype = DSC$K_DTYPE_T;
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|---|
| 442 | value_desc.dsc$b_class = DSC$K_CLASS_S;
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| 443 |
|
|---|
| 444 | vms_status = LIB$GET_SYMBOL (&name_desc, &value_desc,
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| 445 | &value_len, &old_symtbl);
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|---|
| 446 | if (!$VMS_STATUS_SUCCESS (vms_status))
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| 447 | {
|
|---|
| 448 | printf ("lib$get_symbol for command failed: %d\n", vms_status);
|
|---|
| 449 | status = 1;
|
|---|
| 450 | }
|
|---|
| 451 |
|
|---|
| 452 | value[value_len] = 0;
|
|---|
| 453 | result = strncasecmp (&value[1], vms_image, value_len - 1);
|
|---|
| 454 | if (result != 0)
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|---|
| 455 | {
|
|---|
| 456 | printf ("create_foreign_command failed! expected '%s', got '%s'\n",
|
|---|
| 457 | vms_image, &value[1]);
|
|---|
| 458 | status = 1;
|
|---|
| 459 | }
|
|---|
| 460 |
|
|---|
| 461 | /* Test exporting a symbol */
|
|---|
| 462 | vms_status = vms_export_dcl_symbol (vms_symbol1, value1);
|
|---|
| 463 | if (!$VMS_STATUS_SUCCESS (vms_status))
|
|---|
| 464 | {
|
|---|
| 465 | printf ("vms_export_dcl_symbol for command failed: %d\n", vms_status);
|
|---|
| 466 | status = 1;
|
|---|
| 467 | }
|
|---|
| 468 |
|
|---|
| 469 | name_desc.dsc$a_pointer = (char *)vms_symbol1;
|
|---|
| 470 | name_desc.dsc$w_length = strlen (vms_symbol1);
|
|---|
| 471 | vms_status = LIB$GET_SYMBOL(&name_desc, &value_desc,
|
|---|
| 472 | &value_len, &old_symtbl);
|
|---|
| 473 | if (!$VMS_STATUS_SUCCESS(vms_status))
|
|---|
| 474 | {
|
|---|
| 475 | printf ("lib$get_symbol for command failed: %d\n", vms_status);
|
|---|
| 476 | status = 1;
|
|---|
| 477 | }
|
|---|
| 478 |
|
|---|
| 479 | value[value_len] = 0;
|
|---|
| 480 | result = strncmp (value, value1, value_len);
|
|---|
| 481 | if (result != 0)
|
|---|
| 482 | {
|
|---|
| 483 | printf ("vms_export_dcl_symbol failed! expected '%s', got '%s'\n",
|
|---|
| 484 | value1, value);
|
|---|
| 485 | status = 1;
|
|---|
| 486 | }
|
|---|
| 487 |
|
|---|
| 488 | /* Test putenv for DCL symbols */
|
|---|
| 489 | putenv_status = vms_putenv_symbol (putenv_string);
|
|---|
| 490 | if (putenv_status != 0)
|
|---|
| 491 | {
|
|---|
| 492 | perror ("vms_putenv_symbol");
|
|---|
| 493 | status = 1;
|
|---|
| 494 | }
|
|---|
| 495 |
|
|---|
| 496 | name_desc.dsc$a_pointer = (char *)vms_symbol2;
|
|---|
| 497 | name_desc.dsc$w_length = strlen(vms_symbol2);
|
|---|
| 498 | vms_status = LIB$GET_SYMBOL (&name_desc, &value_desc,
|
|---|
| 499 | &value_len, &old_symtbl);
|
|---|
| 500 | if (!$VMS_STATUS_SUCCESS (vms_status))
|
|---|
| 501 | {
|
|---|
| 502 | printf ("lib$get_symbol for command failed: %d\n", vms_status);
|
|---|
| 503 | status = 1;
|
|---|
| 504 | }
|
|---|
| 505 |
|
|---|
| 506 | value[value_len] = 0;
|
|---|
| 507 | result = strncmp (value, value2, value_len);
|
|---|
| 508 | if (result != 0)
|
|---|
| 509 | {
|
|---|
| 510 | printf ("vms_putenv_symbol failed! expected '%s', got '%s'\n",
|
|---|
| 511 | value2, value);
|
|---|
| 512 | status = 1;
|
|---|
| 513 | }
|
|---|
| 514 |
|
|---|
| 515 | vms_restore_symbol (putenv_string);
|
|---|
| 516 | vms_status = LIB$GET_SYMBOL (&name_desc, &value_desc,
|
|---|
| 517 | &value_len, &old_symtbl);
|
|---|
| 518 | if ($VMS_STATUS_SUCCESS (vms_status))
|
|---|
| 519 | {
|
|---|
| 520 | printf ("lib$get_symbol for command succeeded, should have failed\n");
|
|---|
| 521 | status = 1;
|
|---|
| 522 | }
|
|---|
| 523 |
|
|---|
| 524 | exit (status);
|
|---|
| 525 | }
|
|---|
| 526 |
|
|---|
| 527 | #endif
|
|---|