4.3BSD - /usr/src/usr.lib/libU77/getenv_.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)getenv_.c	5.1	6/7/85
   7:  */
   8: 
   9: /*
  10:  * return environment variables
  11:  *
  12:  * calling sequence:
  13:  *	character*20 evar
  14:  *	call getenv (ENV_NAME, evar)
  15:  * where:
  16:  *	ENV_NAME is the name of an environment variable
  17:  *	evar is a character variable which will receive
  18:  *		the current value of ENV_NAME,
  19:  *		or all blanks if ENV_NAME is not defined
  20:  */
  21: 
  22: extern char **environ;
  23: 
  24: getenv_(fname, value, flen, vlen)
  25: char *value, *fname;
  26: long int vlen, flen;
  27: {
  28:     register char *ep, *fp;
  29:     register char **env = environ;
  30:     int i;
  31: 
  32:     while (ep = *env++) {
  33:         for (fp=fname, i=0; i <= flen; i++) {
  34:             if (i == flen || *fp == ' ') {
  35:                 if (*ep++ == '=') {
  36:                     b_char(ep, value, vlen);
  37:                     return(0);
  38:                 }
  39:                 else break;
  40:             }
  41:             else if (*ep++ != *fp++) break;
  42:         }
  43:     }
  44:     b_char(" ", value, vlen);
  45:     return(0);
  46: }

Defined functions