safe_getenv.c

[詳解]

/*++
/* NAME
/*  safe_getenv 3
/* SUMMARY
/*  guarded getenv()
/* SYNOPSIS
/*  #include <safe.h>
/*
/*  char    *safe_getenv(const name)
/*  char    *name;
/* DESCRIPTION
/*  The \fBsafe_getenv\fR() routine reads the named variable from the
/*  environment, provided that the unsafe() routine agrees.
/* SEE ALSO
/*  unsafe(3), detect non-user privileges
/* LICENSE
/* .ad
/* .fi
/*  The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*  Wietse Venema
/*  IBM T.J. Watson Research
/*  P.O. Box 704
/*  Yorktown Heights, NY 10598, USA
/*--*/

/* System library. */

#include <sys_defs.h>
#include <stdlib.h>

/* Utility library. */

#include "safe.h"

/* safe_getenv - read environment variable with guard */

char   *safe_getenv(const char *name)
{
    return (unsafe() == 0 ? getenv(name) : 0);
}