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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [rdos/] [getenv.c] - Rev 207
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/*####################################################################### # RDOS operating system # Copyright (C) 1988-2006, Leif Ekblad # # This library is free software; you can redistribute it and/or modify # it under the terms of the GNU Lesser General Public License as published # by the Free Software Foundation; either version 2.1 of the License, or # (at your option) any later version. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # # The author of this program may be contacted at leif@rdos.net # # getenv.c # getenv function implementation # ##########################################################################*/ /* FUNCTION <<getenv>>---look up environment variable INDEX getenv INDEX environ ANSI_SYNOPSIS #include <stdlib.h> char *getenv(const char *<[name]>); TRAD_SYNOPSIS #include <stdlib.h> char *getenv(<[name]>) char *<[name]>; DESCRIPTION <<getenv>> searches the list of environment variable names and values (using the global pointer ``<<char **environ>>'') for a variable whose name matches the string at <[name]>. If a variable name matches, <<getenv>> returns a pointer to the associated value. RETURNS A pointer to the (string) value of the environment variable, or <<NULL>> if there is no such environment variable. PORTABILITY <<getenv>> is ANSI, but the rules for properly forming names of environment variables vary from one system to another. This function is not thread-safe, but does it need to be?? There is an reentrant class that should be used if reentrance is required */ #include <stdlib.h> #include <stddef.h> #include <string.h> #include <rdos.h> static char envbuf[256]; char *getenv(const char *name) { int handle; char *ptr = 0; handle = RdosOpenSysEnv(); if (handle) { if (RdosFindEnvVar(handle, name, envbuf)) ptr = envbuf; } RdosCloseEnv(handle); return ptr; }