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Annotation of 43BSDReno/kerberosIV/krb/netread.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * $Source: /mit/kerberos/src/lib/krb/RCS/netread.c,v $
                      3:  * $Author: jtkohl $
                      4:  *
                      5:  * Copyright 1987, 1988 by the Massachusetts Institute of Technology.
                      6:  *
                      7:  * For copying and distribution information, please see the file
                      8:  * <mit-copyright.h>.
                      9:  */
                     10: 
                     11: #ifndef        lint
                     12: static char rcsid_netread_c[] =
                     13: "$Header: netread.c,v 4.1 88/11/15 16:47:21 jtkohl Exp $";
                     14: #endif lint
                     15: 
                     16: #include <mit-copyright.h>
                     17: 
                     18: /*
                     19:  * krb_net_read() reads from the file descriptor "fd" to the buffer
                     20:  * "buf", until either 1) "len" bytes have been read or 2) cannot
                     21:  * read anymore from "fd".  It returns the number of bytes read
                     22:  * or a read() error.  (The calling interface is identical to
                     23:  * read(2).)
                     24:  *
                     25:  * XXX must not use non-blocking I/O
                     26:  */
                     27: 
                     28: int
                     29: krb_net_read(fd, buf, len)
                     30: int fd;
                     31: register char *buf;
                     32: register int len;
                     33: {
                     34:     int cc, len2 = 0;
                     35: 
                     36:     do {
                     37:        cc = read(fd, buf, len);
                     38:        if (cc < 0)
                     39:            return(cc);          /* errno is already set */
                     40:        else if (cc == 0) {
                     41:            return(len2);
                     42:        } else {
                     43:            buf += cc;
                     44:            len2 += cc;
                     45:            len -= cc;
                     46:        }
                     47:     } while (len > 0);
                     48:     return(len2);
                     49: }

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