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Diffstat (limited to 'private/crt32/misc/getenv.c')
| -rw-r--r-- | private/crt32/misc/getenv.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/private/crt32/misc/getenv.c b/private/crt32/misc/getenv.c new file mode 100644 index 000000000..7d14d2a74 --- /dev/null +++ b/private/crt32/misc/getenv.c @@ -0,0 +1,167 @@ +/*** +*getenv.c - get the value of an environment variable +* +* Copyright (c) 1985-1992, Microsoft Corporation. All rights reserved. +* +*Purpose: +* defines getenv() - searches the environment for a string variable +* and returns the value of it. +* +*Revision History: +* 11-22-83 RN initial version +* 04-13-87 JCR added const to declaration +* 11-09-87 SKS avoid indexing past end of strings (add strlen check) +* 12-11-87 JCR Added "_LOAD_DS" to declaration +* 06-01-88 PHG Merged normal/DLL versions +* 03-14-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include +* <cruntime.h>, removed #include <register.h> and fixed +* the copyright. Also, cleaned up the formatting a bit. +* 04-05-90 GJF Added #include <string.h>. +* 07-25-90 SBM Removed redundant include (stdio.h) +* 08-13-90 SBM Compiles cleanly with -W3 (made length unsigned int) +* 10-04-90 GJF New-style function declarator. +* 01-18-91 GJF ANSI naming. +* 02-06-91 SRW Added _WIN32_ conditional for GetEnvironmentVariable +* 02-18-91 SRW Removed _WIN32_ conditional for GetEnvironmentVariable +* 01-10-92 GJF Final unlock and return statements shouldn't be in +* if-block. +* 03-11-92 GJF Use case-insensitive comparison for Win32. +* 04-27-92 GJF Repackaged MTHREAD support for Win32 to create a +* _getenv_lk. +* +*******************************************************************************/ + +#include <cruntime.h> +#include <stdlib.h> +#include <string.h> +#include <os2dll.h> +#include <oscalls.h> + +/*** +*char *getenv(option) - search environment for a string +* +*Purpose: +* searches the environment for a string of the form "option=value", +* if found, return value, otherwise NULL. +* +*Entry: +* const char *option - variable to search for in environment +* +*Exit: +* returns the value part of the environment string if found, +* otherwise NULL +* +*Exceptions: +* +*******************************************************************************/ + +#ifdef _CRUISER_ + +char * _CALLTYPE1 getenv ( + REG3 const char *option + ) +{ +#ifdef _POSIX_ + REG1 char **search = environ; +#else + REG1 char **search = _environ; +#endif + REG2 unsigned int length; + + _mlock( _ENV_LOCK ); + + if (search && option) + { + + length = strlen(option); + + /* + ** Make sure `*search' is long enough to be a candidate + ** (We must NOT index past the '\0' at the end of `*search'!) + ** and that it has an equal sign (`=') in the correct spot. + ** If both of these requirements are met, compare the strings. + */ + while (*search) + { + if (strlen(*search) > length && (*(*search + length) + == '=') && (strncmp(*search, option, length) == 0)) { + _munlock( _ENV_LOCK ); + return(*search + length + 1); + } + + search++; + } + } + + _munlock( _ENV_LOCK ); + return(NULL); +} + + +#else /* ndef _CRUISER_ */ +#ifdef _WIN32_ + + +#ifdef MTHREAD + + +char * _CALLTYPE1 getenv ( + const char *option + ) +{ + char *retval; + + _mlock(_ENV_LOCK); + + retval = _getenv_lk(option); + + _munlock(_ENV_LOCK); + + return(retval); + +} + + +char * _CALLTYPE1 _getenv_lk ( + const char *option + ) + +#else /* ndef MTHREAD */ + +char * _CALLTYPE1 getenv ( + const char *option + ) + +#endif /* MTHREAD */ +{ + char **search = _environ; + unsigned int length; + + if (search && option) + { + + length = strlen(option); + + /* + ** Make sure `*search' is long enough to be a candidate + ** (We must NOT index past the '\0' at the end of `*search'!) + ** and that it has an equal sign (`=') in the correct spot. + ** If both of these requirements are met, compare the strings. + */ + while (*search) + { + if (strlen(*search) > length && (*(*search + length) + == '=') && (strnicmp(*search, option, length) == 0)) { + return(*search + length + 1); + } + + search++; + } + } + + return(NULL); +} + + +#endif /* _WIN32_ */ +#endif /* _CRUISER_ */ |