53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
/*
|
|
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
* See the copyright notice in the ACK home directory, in the file "Copyright".
|
|
*/
|
|
/* $Id$ */
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
extern char* _findenv(const char* name, int* offset);
|
|
|
|
/*
|
|
* getenv(name) --
|
|
* Returns ptr to value associated with name, if any, else NULL.
|
|
*/
|
|
char* getenv(const char* name)
|
|
{
|
|
int offset;
|
|
|
|
return (_findenv(name, &offset));
|
|
}
|
|
|
|
/*
|
|
* _findenv(name,offset) --
|
|
* 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* _findenv(register const char* name, int* offset)
|
|
{
|
|
extern char** environ;
|
|
register int len;
|
|
register char** P;
|
|
register const char* C;
|
|
|
|
if (!environ)
|
|
return NULL;
|
|
|
|
for (C = name, len = 0; *C && *C != '='; ++C, ++len)
|
|
;
|
|
for (P = environ; *P; ++P)
|
|
if (!strncmp(*P, name, len))
|
|
if (*(C = *P + len) == '=')
|
|
{
|
|
*offset = P - environ;
|
|
return (char*)(++C);
|
|
}
|
|
return (NULL);
|
|
}
|