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Annotation of 42BSD/usr.lib/libU77/getenv_.c, revision 1.1.1.1

1.1       root        1: /*
                      2: char id_getenv[] = "@(#)getenv_.c      1.1";
                      3:  *
                      4:  * return environment variables
                      5:  *
                      6:  * calling sequence:
                      7:  *     character*20 evar
                      8:  *     call getenv (ENV_NAME, evar)
                      9:  * where:
                     10:  *     ENV_NAME is the name of an environment variable
                     11:  *     evar is a character variable which will receive
                     12:  *             the current value of ENV_NAME,
                     13:  *             or all blanks if ENV_NAME is not defined
                     14:  */
                     15: 
                     16: extern char **environ;
                     17: 
                     18: getenv_(fname, value, flen, vlen)
                     19: char *value, *fname;
                     20: long int vlen, flen;
                     21: {
                     22:        register char *ep, *fp;
                     23:        register char **env = environ;
                     24:        int i;
                     25: 
                     26:        while (ep = *env++) {
                     27:                for (fp=fname, i=0; i <= flen; i++) {
                     28:                        if (i == flen || *fp == ' ') {
                     29:                                if (*ep++ == '=') {
                     30:                                        b_char(ep, value, vlen);
                     31:                                        return(0);
                     32:                                }
                     33:                                else break;
                     34:                        }
                     35:                        else if (*ep++ != *fp++) break;
                     36:                }
                     37:        }
                     38:        b_char(" ", value, vlen);
                     39:        return(0);
                     40: }

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