freebsd-src/lib/libF77/getenv_.c
1997-04-13 01:16:58 +00:00

52 lines
975 B
C

#include "f2c.h"
/*
* getenv - f77 subroutine to return environment variables
*
* called by:
* call getenv (ENV_NAME, char_var)
* where:
* ENV_NAME is the name of an environment variable
* char_var is a character variable which will receive
* the current value of ENV_NAME, or all blanks
* if ENV_NAME is not defined
*/
#ifdef KR_headers
VOID getenv_(fname, value, flen, vlen) char *value, *fname; ftnlen vlen, flen;
#else
void getenv_(char *fname, char *value, ftnlen flen, ftnlen vlen)
#endif
{
extern char **environ;
register char *ep, *fp, *flast;
register char **env = environ;
flast = fname + flen;
for(fp = fname ; fp < flast ; ++fp)
if(*fp == ' ')
{
flast = fp;
break;
}
while (ep = *env++)
{
for(fp = fname; fp<flast ; )
if(*fp++ != *ep++)
goto endloop;
if(*ep++ == '=') { /* copy right hand side */
while( *ep && --vlen>=0 )
*value++ = *ep++;
goto blank;
}
endloop: ;
}
blank:
while( --vlen >= 0 )
*value++ = ' ';
}