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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libc/] [stdlib/] [getenv.c] - Rev 1775
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/* 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. <<getenv>> requires a global pointer <<environ>>. */ /* This file may have been modified by DJ Delorie (Jan 1991). If so, ** these modifications are Coyright (C) 1991 DJ Delorie, 24 Kirsten Ave, ** Rochester NH, 03867-2954, USA. */ /* * Copyright (c) 1987 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that: (1) source distributions retain this entire copyright * notice and comment, and (2) distributions including binaries display * the following acknowledgement: ``This product includes software * developed by the University of California, Berkeley and its contributors'' * in the documentation or other materials provided with the distribution * and in all advertising materials mentioning features or use of this * software. Neither the name of the University nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #include <stdlib.h> #include <stddef.h> #include <string.h> extern char **environ; /* * _findenv -- * Returns pointer to value associated with name, if any, else NULL. * Sets offset to be the offset of the name/value combination in the * environmental array, for use by setenv(3) and unsetenv(3). * Explicitly removes '=' in argument name. * * This routine *should* be a static; don't use it. */ char * _DEFUN (_findenv, (name, offset), register _CONST char *name _AND int *offset) { return _findenv_r (_REENT, name, offset); } /* * getenv -- * Returns ptr to value associated with name, if any, else NULL. */ char * _DEFUN (getenv, (name), _CONST char *name) { int offset; char *_findenv_r (); return _findenv_r (_REENT, name, &offset); }
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