209 lines
7 KiB
C
209 lines
7 KiB
C
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/***
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*stdenvp.c - standard _setenvp routine
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*
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* Copyright (c) 1989-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* This module is called by the C start-up routine to set up "_environ".
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* Its sets up an array of pointers to strings in the environment.
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* The global symbol "_environ" is set to point to this array.
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*
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*Revision History:
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* 11-07-84 GFW initial version
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* 01-08-86 SKS Modified for OS/2
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* 05-21-86 SKS Call _stdalloc to get memory for strings
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* 09-04-86 SKS Added check to skip the "*C_FILE_INFO" string
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* 10-21-86 SKS Improved check for "*C_FILE_INFO"/"_C_FILE_INFO"
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* 02-19-88 SKS Handle case where environment starts with a single null
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* 05-10-88 JCR Modified code to accept far pointer from _stdalloc
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* 06-01-88 PHG Merged DLL and normal versions
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* 07-12-88 JCR Largely re-written: (1) split mem allocation into two
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* seperate malloc() calls to help simplify putenv(),
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* (2) stdalloc() no longer robs from stack, (3) cProc/cEnd
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* sequence, (4) misc cleanup
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* 09-20-88 WAJ Initial 386 version
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* 12-13-88 JCR Use rterr.inc parameters for runtime errors
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* 04-09-90 GJF Added #include <cruntime.h>. Made the calling type
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* _CALLTYPE1. Also, fixed the copyright and cleaned up
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* up the formatting a bit.
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* 06-05-90 GJF Changed error message interface.
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* 10-08-90 GJF New-style function declarator.
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* 10-31-90 GJF Fixed statement appending the final NULL (Stevewo
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* found the bug).
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* 12-11-90 SRW Changed to include <oscalls.h> and setup _environ
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* correctly for Win32
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* 01-21-91 GJF ANSI naming.
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* 02-07-91 SRW Change _WIN32_ specific code to allocate static copy
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* 02-18-91 SRW Change _WIN32_ specific code to allocate copy of
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* variable strings as well [_WIN32_]
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* 07-25-91 GJF Changed strupr to _strupr.
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* 03-31-92 DJM POSIX support.
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* 04-20-92 GJF Removed conversion to upper-case code for Win32.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 11-24-93 CFW Rip out Cruiser and filter out "=c:\foo" type.
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* 11-29-93 CFW Remove unused POSIX stuff, wide char enable.
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* 12-07-93 CFW Change _TCHAR to _TSCHAR.
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* 01-10-95 CFW Debug CRT allocs.
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* 04-07-95 CFW Free environment block on demand.
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* 07-03-95 GJF Always free environment block.
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* 02-20-96 SKS Set _aenvptr/_wenvptr to NULL after freeing what it
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* points to (a copy of environment strings).
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* 06-30-97 GJF Added explicit, conditional init. of the mbctype table.
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* Set __env_initialized flag. Also detab-ed.
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* 01-04-99 GJF Changes for 64-bit size_t.
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* 03-05-01 PML Don't AV if _aenvptr is NULL (vs7#174755).
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* 03-27-01 PML Return error instead of calling amsg_exit (vs7#231220)
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <string.h>
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#include <stdlib.h>
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#include <internal.h>
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#include <rterr.h>
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#include <oscalls.h>
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#include <tchar.h>
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#include <dbgint.h>
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#ifndef CRTDLL
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#ifdef _MBCS
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/*
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* Flag to ensure multibyte ctype table is only initialized once
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*/
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extern int __mbctype_initialized;
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#endif
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/*
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* Flag checked by getenv() and _putenv() to determine if the environment has
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* been initialized.
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*/
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extern int __env_initialized;
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#endif
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/***
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*_setenvp - set up "envp" for C programs
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*
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*Purpose:
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* Reads the environment and build the envp array for C programs.
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*
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*Entry:
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* The environment strings occur at _aenvptr.
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* The list of environment strings is terminated by an extra null
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* byte. Thus two null bytes in a row indicate the end of the
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* last environment string and the end of the environment, resp.
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*
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*Exit:
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* "environ" points to a null-terminated list of pointers to ASCIZ
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* strings, each of which is of the form "VAR=VALUE". The strings
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* are copied from the environment area. This array of pointers will
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* be malloc'ed. The block pointed to by _aenvptr is deallocated.
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*
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*Uses:
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* Allocates space on the heap for the environment pointers.
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*
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*Exceptions:
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* If space cannot be allocated, program is terminated.
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*
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*******************************************************************************/
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#ifdef WPRFLAG
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int __cdecl _wsetenvp (
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#else
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int __cdecl _setenvp (
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#endif
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void
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)
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{
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_TSCHAR *p;
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_TSCHAR **env; /* _environ ptr traversal pointer */
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int numstrings; /* number of environment strings */
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int cchars;
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#if !defined(CRTDLL) && defined(_MBCS)
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/* If necessary, initialize the multibyte ctype table. */
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if ( __mbctype_initialized == 0 )
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__initmbctable();
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#endif
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numstrings = 0;
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#ifdef WPRFLAG
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p = _wenvptr;
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#else
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p = _aenvptr;
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#endif
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/*
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* We called __crtGetEnvironmentStrings[AW] just before this,
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* so if _[aw]envptr is NULL, we failed to get the environment.
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* Return an error.
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*/
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if (p == NULL)
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return -1;
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/*
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* NOTE: starting with single null indicates no environ.
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* Count the number of strings. Skip drive letter settings
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* ("=C:=C:\foo" type) by skipping all environment variables
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* that begin with '=' character.
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*/
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while (*p != _T('\0')) {
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/* don't count "=..." type */
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if (*p != _T('='))
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++numstrings;
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p += _tcslen(p) + 1;
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}
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/* need pointer for each string, plus one null ptr at end */
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if ( (_tenviron = env = (_TSCHAR **)
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_malloc_crt((numstrings+1) * sizeof(_TSCHAR *))) == NULL )
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return -1;
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/* copy strings to malloc'd memory and save pointers in _environ */
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#ifdef WPRFLAG
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for ( p = _wenvptr ; *p != L'\0' ; p += cchars )
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#else
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for ( p = _aenvptr ; *p != '\0' ; p += cchars )
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#endif
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{
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cchars = (int)_tcslen(p) + 1;
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/* don't copy "=..." type */
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if (*p != _T('=')) {
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if ( (*env = (_TSCHAR *)_malloc_crt(cchars * sizeof(_TSCHAR)))
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== NULL )
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{
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_free_crt(_tenviron);
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_tenviron = NULL;
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return -1;
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}
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_tcscpy(*env, p);
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env++;
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}
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}
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#ifdef WPRFLAG
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_free_crt(_wenvptr);
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_wenvptr = NULL;
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#else
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_free_crt(_aenvptr);
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_aenvptr = NULL;
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#endif
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/* and a final NULL pointer */
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*env = NULL;
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#ifndef CRTDLL
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/*
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* Set flag for getenv() and _putenv() to know the environment
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* has been set up.
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*/
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__env_initialized = 1;
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#endif
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return 0;
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}
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