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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /*- |
| 2 | * Copyright (c) 1990, 1993 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * |
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| 5 | * This code is derived from software contributed to Berkeley by |
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| 6 | * Chris Torek. |
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| 7 | * |
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| 8 | * Redistribution and use in source and binary forms, with or without |
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| 9 | * modification, are permitted provided that the following conditions |
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| 10 | * are met: |
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| 11 | * 1. Redistributions of source code must retain the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer. |
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer in the |
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| 15 | * documentation and/or other materials provided with the distribution. |
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| 16 | * 3. All advertising materials mentioning features or use of this software |
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| 17 | * must display the following acknowledgement: |
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| 18 | * This product includes software developed by the University of |
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| 19 | * California, Berkeley and its contributors. |
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| 20 | * 4. Neither the name of the University nor the names of its contributors |
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| 21 | * may be used to endorse or promote products derived from this software |
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| 22 | * without specific prior written permission. |
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| 23 | * |
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 34 | * SUCH DAMAGE. |
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| 35 | */ |
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| 36 | |||
| 37 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 38 | #if 0 |
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| 39 | static char sccsid[] = "@(#)fvwrite.c 8.1 (Berkeley) 6/4/93"; |
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| 40 | #endif |
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| 41 | static const char rcsid[] = |
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| 42 | "$\Id: fvwrite.c,v 1.3 1996/06/22 10:33:27 jraynard Exp $"; |
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| 43 | #endif /* LIBC_SCCS and not lint */ |
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| 44 | |||
| 45 | #include <stdio.h> |
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| 46 | #include <string.h> |
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| 47 | #include "local.h" |
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| 48 | #include "fvwrite.h" |
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| 49 | |||
| 50 | /* |
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| 51 | * Write some memory regions. Return zero on success, EOF on error. |
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| 52 | * |
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| 53 | * This routine is large and unsightly, but most of the ugliness due |
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| 54 | * to the three different kinds of output buffering is handled here. |
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| 55 | */ |
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| 56 | int |
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| 57 | __sfvwrite(fp, uio) |
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| 58 | register FILE *fp; |
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| 59 | register struct __suio *uio; |
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| 60 | { |
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| 61 | register size_t len; |
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| 62 | register char *p; |
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| 63 | register struct __siov *iov; |
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| 64 | register int w, s; |
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| 65 | char *nl; |
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| 66 | int nlknown, nldist; |
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| 67 | |||
| 68 | if ((len = uio->uio_resid) == 0) |
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| 69 | return (0); |
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| 70 | /* make sure we can write */ |
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| 71 | if (cantwrite(fp)) |
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| 72 | return (EOF); |
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| 73 | |||
| 74 | #define MIN(a, b) ((a) < (b) ? (a) : (b)) |
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| 75 | #define COPY(n) (void)memcpy((void *)fp->_p, (void *)p, (size_t)(n)) |
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| 76 | |||
| 77 | iov = uio->uio_iov; |
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| 78 | p = iov->iov_base; |
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| 79 | len = iov->iov_len; |
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| 80 | iov++; |
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| 81 | #define GETIOV(extra_work) \ |
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| 82 | while (len == 0) { \ |
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| 83 | extra_work; \ |
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| 84 | p = iov->iov_base; \ |
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| 85 | len = iov->iov_len; \ |
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| 86 | iov++; \ |
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| 87 | } |
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| 88 | if (fp->_flags & __SNBF) { |
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| 89 | /* |
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| 90 | * Unbuffered: write up to BUFSIZ bytes at a time. |
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| 91 | */ |
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| 92 | do { |
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| 93 | GETIOV(;); |
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| 94 | w = (*fp->_write)(fp->_cookie, p, MIN(len, BUFSIZ)); |
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| 95 | if (w <= 0) |
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| 96 | goto err; |
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| 97 | p += w; |
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| 98 | len -= w; |
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| 99 | } while ((uio->uio_resid -= w) != 0); |
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| 100 | } else if ((fp->_flags & __SLBF) == 0) { |
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| 101 | /* |
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| 102 | * Fully buffered: fill partially full buffer, if any, |
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| 103 | * and then flush. If there is no partial buffer, write |
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| 104 | * one _bf._size byte chunk directly (without copying). |
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| 105 | * |
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| 106 | * String output is a special case: write as many bytes |
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| 107 | * as fit, but pretend we wrote everything. This makes |
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| 108 | * snprintf() return the number of bytes needed, rather |
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| 109 | * than the number used, and avoids its write function |
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| 110 | * (so that the write function can be invalid). |
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| 111 | */ |
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| 112 | do { |
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| 113 | GETIOV(;); |
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| 114 | w = fp->_w; |
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| 115 | if (fp->_flags & __SSTR) { |
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| 116 | if (len < w) |
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| 117 | w = len; |
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| 118 | COPY(w); /* copy MIN(fp->_w,len), */ |
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| 119 | fp->_w -= w; |
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| 120 | fp->_p += w; |
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| 121 | w = len; /* but pretend copied all */ |
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| 122 | } else if (fp->_p > fp->_bf._base && len > w) { |
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| 123 | /* fill and flush */ |
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| 124 | COPY(w); |
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| 125 | /* fp->_w -= w; */ /* unneeded */ |
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| 126 | fp->_p += w; |
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| 127 | if (fflush(fp)) |
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| 128 | goto err; |
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| 129 | } else if (len >= (w = fp->_bf._size)) { |
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| 130 | /* write directly */ |
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| 131 | w = (*fp->_write)(fp->_cookie, p, w); |
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| 132 | if (w <= 0) |
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| 133 | goto err; |
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| 134 | } else { |
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| 135 | /* fill and done */ |
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| 136 | w = len; |
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| 137 | COPY(w); |
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| 138 | fp->_w -= w; |
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| 139 | fp->_p += w; |
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| 140 | } |
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| 141 | p += w; |
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| 142 | len -= w; |
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| 143 | } while ((uio->uio_resid -= w) != 0); |
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| 144 | } else { |
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| 145 | /* |
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| 146 | * Line buffered: like fully buffered, but we |
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| 147 | * must check for newlines. Compute the distance |
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| 148 | * to the first newline (including the newline), |
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| 149 | * or `infinity' if there is none, then pretend |
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| 150 | * that the amount to write is MIN(len,nldist). |
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| 151 | */ |
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| 152 | nlknown = 0; |
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| 153 | nldist = 0; /* XXX just to keep gcc happy */ |
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| 154 | do { |
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| 155 | GETIOV(nlknown = 0); |
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| 156 | if (!nlknown) { |
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| 157 | nl = memchr((void *)p, '\n', len); |
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| 158 | nldist = nl ? nl + 1 - p : len + 1; |
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| 159 | nlknown = 1; |
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| 160 | } |
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| 161 | s = MIN(len, nldist); |
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| 162 | w = fp->_w + fp->_bf._size; |
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| 163 | if (fp->_p > fp->_bf._base && s > w) { |
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| 164 | COPY(w); |
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| 165 | /* fp->_w -= w; */ |
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| 166 | fp->_p += w; |
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| 167 | if (fflush(fp)) |
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| 168 | goto err; |
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| 169 | } else if (s >= (w = fp->_bf._size)) { |
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| 170 | w = (*fp->_write)(fp->_cookie, p, w); |
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| 171 | if (w <= 0) |
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| 172 | goto err; |
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| 173 | } else { |
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| 174 | w = s; |
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| 175 | COPY(w); |
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| 176 | fp->_w -= w; |
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| 177 | fp->_p += w; |
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| 178 | } |
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| 179 | if ((nldist -= w) == 0) { |
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| 180 | /* copied the newline: flush and forget */ |
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| 181 | if (fflush(fp)) |
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| 182 | goto err; |
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| 183 | nlknown = 0; |
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| 184 | } |
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| 185 | p += w; |
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| 186 | len -= w; |
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| 187 | } while ((uio->uio_resid -= w) != 0); |
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| 188 | } |
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| 189 | return (0); |
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| 190 | |||
| 191 | err: |
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| 192 | fp->_flags |= __SERR; |
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| 193 | return (EOF); |
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| 194 | } |