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Annotation of 43BSD/lib/libc/stdio/fread.c, revision 1.1.1.1

1.1       root        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: 
                      7: #if defined(LIBC_SCCS) && !defined(lint)
                      8: static char sccsid[] = "@(#)fread.c    5.2 (Berkeley) 3/9/86";
                      9: #endif LIBC_SCCS and not lint
                     10: 
                     11: #include       <stdio.h>
                     12: 
                     13: fread(ptr, size, count, iop)
                     14:        register char *ptr;
                     15:        unsigned size, count;
                     16:        register FILE *iop;
                     17: {
                     18:        register int s;
                     19:        int c;
                     20: 
                     21:        s = size * count;
                     22:        while (s > 0) {
                     23:                if (iop->_cnt < s) {
                     24:                        if (iop->_cnt > 0) {
                     25:                                bcopy(iop->_ptr, ptr, iop->_cnt);
                     26:                                ptr += iop->_cnt;
                     27:                                s -= iop->_cnt;
                     28:                        }
                     29:                        /*
                     30:                         * filbuf clobbers _cnt & _ptr,
                     31:                         * so don't waste time setting them.
                     32:                         */
                     33:                        if ((c = _filbuf(iop)) == EOF)
                     34:                                break;
                     35:                        *ptr++ = c;
                     36:                        s--;
                     37:                }
                     38:                if (iop->_cnt >= s) {
                     39:                        bcopy(iop->_ptr, ptr, s);
                     40:                        iop->_ptr += s;
                     41:                        iop->_cnt -= s;
                     42:                        return (count);
                     43:                }
                     44:        }
                     45:        return (size != 0 ? count - ((s + size - 1) / size) : 0);
                     46: }

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