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Diffstat (limited to 'private/crt32/startup/stdenvp.c')
| -rw-r--r-- | private/crt32/startup/stdenvp.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/private/crt32/startup/stdenvp.c b/private/crt32/startup/stdenvp.c new file mode 100644 index 000000000..7ebdfa806 --- /dev/null +++ b/private/crt32/startup/stdenvp.c @@ -0,0 +1,192 @@ +/*** +*stdenvp.c - OS/2 standard _setenvp routine +* +* Copyright (c) 1989-1992, Microsoft Corporation. All rights reserved. +* +*Purpose: +* This module is called by the C start-up routine to set up "_environ". +* Its sets up an array of pointers to strings in the environment. +* The global symbol "_environ" is set to point to this array. +* +*Revision History: +* 11-07-84 GFW initial version +* 01-08-86 SKS Modified for OS/2 +* 05-21-86 SKS Call _stdalloc to get memory for strings +* 09-04-86 SKS Added check to skip the "*C_FILE_INFO" string +* 10-21-86 SKS Improved check for "*C_FILE_INFO"/"_C_FILE_INFO" +* 02-19-88 SKS Handle case where environment starts with a single null +* 05-10-88 JCR Modified code to accept far pointer from _stdalloc +* 06-01-88 PHG Merged DLL and normal versions +* 07-12-88 JCR Largely re-written: (1) split mem allocation into two +* seperate malloc() calls to help simplify putenv(), +* (2) stdalloc() no longer robs from stack, (3) cProc/cEnd +* sequence, (4) misc cleanup +* 09-20-88 WAJ Initial 386 version +* 12-13-88 JCR Use rterr.inc parameters for runtime errors +* 04-09-90 GJF Added #include <cruntime.h>. Made the calling type +* _CALLTYPE1. Also, fixed the copyright and cleaned up +* up the formatting a bit. +* 06-05-90 GJF Changed error message interface. +* 10-08-90 GJF New-style function declarator. +* 10-31-90 GJF Fixed statement appending the final NULL (Stevewo +* found the bug). +* 12-11-90 SRW Changed to include <oscalls.h> and setup _environ +* correctly for Win32 +* 01-21-91 GJF ANSI naming. +* 02-07-91 SRW Change _WIN32_ specific code to allocate static copy (_WIN32_) +* 02-18-91 SRW Change _WIN32_ specific code to allocate copy of +* variable strings as well [_WIN32_] +* 07-25-91 GJF Changed strupr to _strupr. +* 03-31-92 DJM POSIX support. +* 04-20-92 GJF Removed conversion to upper-case code for Win32. +* +*******************************************************************************/ + +#include <cruntime.h> +#include <string.h> +#include <stdlib.h> +#include <internal.h> +#include <rterr.h> +#include <oscalls.h> + +/* C file info string */ +extern char _cfinfo[]; + +/*** +*_setenvp - set up "envp" for C programs +* +*Purpose: +* Reads the environment and build the envp array for C programs. +* +*Entry: +* The environment strings occur at _aenvptr. +* The list of environment strings is terminated by an extra null +* byte. Thus two null bytes in a row indicate the end of the +* last environment string and the end of the environment, resp. +* +*Exit: +* "environ" points to a null-terminated list of pointers to ASCIZ +* strings, each of which is of the form "VAR=VALUE". The strings +* are not copied from the environment area. Instead, the array of +* pointers will point into the OS environment area. This array of +* pointers will be malloc'ed +* +*Uses: +* Allocates space on the heap for the environment pointers. +* +*Exceptions: +* If space cannot be allocated, program is terminated. +* +*******************************************************************************/ + +void _CALLTYPE1 _setenvp ( + void + ) +{ + char *p; + char **env; /* _environ ptr traversal pointer */ + int numstrings; /* number of environment strings */ + +#ifdef _CRUISER_ + + numstrings = 0; + p = _aenvptr; + + /* NOTE: starting with single null indicates no environ */ + /* count the number of strings */ + while (*p != '\0') { + p += strlen(p) + 1; + ++numstrings; + } + + /* need pointer for each string, plus one null ptr at end */ + _environ = env = malloc((numstrings+1) * sizeof(char *)); + if (_environ == NULL) + _amsg_exit(_RT_SPACEENV); + + p = _aenvptr; + /* copy pointers to strings into env - don't copy _C_FILEINFO string */ + while (*p != '\0') { + + if (strncmp(p, _acfinfo, CFI_LENGTH) != 0) + *env++ = p; + p += strlen(p) + 1; + } + + /* and a final NULL pointer */ + *env = NULL; + +#else /* ndef _CRUISER_ */ + +#ifdef _WIN32_ + int cb; + + numstrings = 0; + p = _aenvptr; + + /* NOTE: starting with single null indicates no environ */ + /* count the number of strings */ + while (*p != '\0') { + p += strlen(p) + 1; + ++numstrings; + } + + /* need pointer for each string, plus one null ptr at end */ + if ( (_environ = env = malloc((numstrings+1) * sizeof(char *))) + == NULL ) + _amsg_exit(_RT_SPACEENV); + + /* copy strings to malloc'd memory and save pointers in _environ */ + for ( p = _aenvptr ; *p != '\0' ; env++, p += cb ) { + cb = strlen(p) + 1; + if ( (*env = malloc(cb)) == NULL ) + _amsg_exit(_RT_SPACEENV); + strcpy(*env, p); + } + + /* and a final NULL pointer */ + *env = NULL; + +#else /* ndef _WIN32_ */ + +#ifdef _POSIX_ + +#if 0 /* it would seem that this code is unnecessary for POSIX */ + /* since it is never called! */ + + numstrings = 0; + p = _aenvptr; + + /* NOTE: starting with single null indicates no environ */ + /* count the number of strings */ + while (*p != '\0') { + p += strlen(p) + 1; + ++numstrings; + } + + /* need pointer for each string, plus one null ptr at end */ + _environ = env = malloc((numstrings+1) * sizeof(char *)); + + p = _aenvptr; + while (*p != '\0') { + *env = p++; + while (*p++ != '\0') + ; + env++; + } + + /* and a final NULL pointer */ + *env = NULL; + +#endif /* 0 */ + +#else + +#error ERROR - ONLY CRUISER, POSIX, OR WIN32 TARGET SUPPORTED! + +#endif /* _POSIX_ */ + +#endif /* _WIN32_ */ + +#endif /* _CRUISER_ */ +} |