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Annotation of prex-old/usr/lib/libc/stdio/refill.c, Revision 1.1

1.1     ! nbrk        1: /*-
        !             2:  * Copyright (c) 1990, 1993
        !             3:  *     The Regents of the University of California.  All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Chris Torek.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. Neither the name of the University nor the names of its contributors
        !            17:  *    may be used to endorse or promote products derived from this software
        !            18:  *    without specific prior written permission.
        !            19:  *
        !            20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            30:  * SUCH DAMAGE.
        !            31:  */
        !            32:
        !            33: #include <errno.h>
        !            34: #include <stdio.h>
        !            35: #include <stdlib.h>
        !            36: #include "local.h"
        !            37:
        !            38: static int
        !            39: lflush(FILE *fp)
        !            40: {
        !            41:
        !            42:        if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
        !            43:                return (__sflush(fp));
        !            44:        return (0);
        !            45: }
        !            46:
        !            47: /*
        !            48:  * Refill a stdio buffer.
        !            49:  * Return EOF on eof or error, 0 otherwise.
        !            50:  */
        !            51: int
        !            52: __srefill(fp)
        !            53:        FILE *fp;
        !            54: {
        !            55:
        !            56:        /* make sure stdio is set up */
        !            57:        if (!__sdidinit)
        !            58:                __sinit();
        !            59:
        !            60:        fp->_r = 0;             /* largely a convenience for callers */
        !            61:
        !            62:        /* SysV does not make this test; take it out for compatibility */
        !            63:        if (fp->_flags & __SEOF)
        !            64:                return (EOF);
        !            65:
        !            66:        /* if not already reading, have to be reading and writing */
        !            67:        if ((fp->_flags & __SRD) == 0) {
        !            68:                if ((fp->_flags & __SRW) == 0) {
        !            69:                        errno = EBADF;
        !            70:                        return (EOF);
        !            71:                }
        !            72:                /* switch to reading */
        !            73:                if (fp->_flags & __SWR) {
        !            74:                        if (__sflush(fp))
        !            75:                                return (EOF);
        !            76:                        fp->_flags &= ~__SWR;
        !            77:                        fp->_w = 0;
        !            78:                }
        !            79:                fp->_flags |= __SRD;
        !            80:        } else {
        !            81:                /*
        !            82:                 * We were reading.  If there is an ungetc buffer,
        !            83:                 * we must have been reading from that.  Drop it,
        !            84:                 * restoring the previous buffer (if any).  If there
        !            85:                 * is anything in that buffer, return.
        !            86:                 */
        !            87:                if (HASUB(fp)) {
        !            88:                        FREEUB(fp);
        !            89:                        if ((fp->_r = fp->_ur) != 0) {
        !            90:                                fp->_p = fp->_up;
        !            91:                                return (0);
        !            92:                        }
        !            93:                }
        !            94:        }
        !            95:
        !            96:        if (fp->_bf._base == NULL)
        !            97:                __smakebuf(fp);
        !            98:
        !            99:        /*
        !           100:         * Before reading from a line buffered or unbuffered file,
        !           101:         * flush all line buffered output files, per the ANSI C
        !           102:         * standard.
        !           103:         */
        !           104:        if (fp->_flags & (__SLBF|__SNBF))
        !           105:                (void) _fwalk(lflush);
        !           106:        fp->_p = fp->_bf._base;
        !           107:        fp->_r = __sread(fp, (char *)fp->_p, fp->_bf._size);
        !           108:        if (fp->_r <= 0) {
        !           109:                if (fp->_r == 0)
        !           110:                        fp->_flags |= __SEOF;
        !           111:                else {
        !           112:                        fp->_r = 0;
        !           113:                        fp->_flags |= __SERR;
        !           114:                }
        !           115:                return (EOF);
        !           116:        }
        !           117:        return (0);
        !           118: }