267 lines
7.0 KiB
C
267 lines
7.0 KiB
C
/*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* No user fns here. Pesch 15apr92. */
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#include <_ansi.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <limits.h>
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#include "local.h"
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#include "fvwrite.h"
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#define COPY(n) _CAST_VOID memmove ((_PTR) fp->_p, (_PTR) p, (size_t) (n))
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#define GETIOV(extra_work) \
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while (len == 0) \
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{ \
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extra_work; \
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p = iov->iov_base; \
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len = iov->iov_len; \
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iov++; \
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}
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/*
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* Write some memory regions. Return zero on success, EOF on error.
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*
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* This routine is large and unsightly, but most of the ugliness due
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* to the three different kinds of output buffering is handled here.
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*/
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int
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_DEFUN(__sfvwrite_r, (ptr, fp, uio),
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struct _reent *ptr _AND
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register FILE *fp _AND
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register struct __suio *uio)
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{
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register size_t len;
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register _CONST char *p = NULL;
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register struct __siov *iov;
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register _READ_WRITE_RETURN_TYPE w, s;
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char *nl;
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int nlknown, nldist;
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if ((len = uio->uio_resid) == 0)
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return 0;
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/* make sure we can write */
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if (cantwrite (ptr, fp))
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return EOF;
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iov = uio->uio_iov;
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len = 0;
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#ifdef __SCLE
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if (fp->_flags & __SCLE) /* text mode */
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{
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do
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{
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GETIOV (;);
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while (len > 0)
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{
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if (putc (*p, fp) == EOF)
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return EOF;
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p++;
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len--;
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uio->uio_resid--;
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}
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}
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while (uio->uio_resid > 0);
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return 0;
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}
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#endif
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if (fp->_flags & __SNBF)
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{
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/*
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* Unbuffered: Split buffer in the largest multiple of BUFSIZ < INT_MAX
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* as some legacy code may expect int instead of size_t.
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*/
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do
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{
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GETIOV (;);
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w = fp->_write (ptr, fp->_cookie, p,
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MIN (len, INT_MAX - INT_MAX % BUFSIZ));
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if (w <= 0)
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goto err;
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p += w;
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len -= w;
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}
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while ((uio->uio_resid -= w) != 0);
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}
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else if ((fp->_flags & __SLBF) == 0)
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{
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/*
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* Fully buffered: fill partially full buffer, if any,
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* and then flush. If there is no partial buffer, write
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* one _bf._size byte chunk directly (without copying).
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*
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* String output is a special case: write as many bytes
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* as fit, but pretend we wrote everything. This makes
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* snprintf() return the number of bytes needed, rather
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* than the number used, and avoids its write function
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* (so that the write function can be invalid). If
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* we are dealing with the asprintf routines, we will
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* dynamically increase the buffer size as needed.
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*/
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do
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{
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GETIOV (;);
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w = fp->_w;
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if (fp->_flags & __SSTR)
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{
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if (len >= w && fp->_flags & (__SMBF | __SOPT))
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{ /* must be asprintf family */
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unsigned char *str;
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int curpos = (fp->_p - fp->_bf._base);
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/* Choose a geometric growth factor to avoid
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quadratic realloc behavior, but use a rate less
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than (1+sqrt(5))/2 to accomodate malloc
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overhead. asprintf EXPECTS us to overallocate, so
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that it can add a trailing \0 without
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reallocating. The new allocation should thus be
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max(prev_size*1.5, curpos+len+1). */
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int newsize = fp->_bf._size * 3 / 2;
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if (newsize < curpos + len + 1)
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newsize = curpos + len + 1;
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if (fp->_flags & __SOPT)
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{
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/* asnprintf leaves original buffer alone. */
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str = (unsigned char *)_malloc_r (ptr, newsize);
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if (!str)
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{
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ptr->_errno = ENOMEM;
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goto err;
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}
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memcpy (str, fp->_bf._base, curpos);
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fp->_flags = (fp->_flags & ~__SOPT) | __SMBF;
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}
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else
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{
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str = (unsigned char *)_realloc_r (ptr, fp->_bf._base,
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newsize);
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if (!str)
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{
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/* Free buffer which is no longer used and clear
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__SMBF flag to avoid double free in fclose. */
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_free_r (ptr, fp->_bf._base);
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fp->_flags &= ~__SMBF;
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/* Ensure correct errno, even if free changed it. */
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ptr->_errno = ENOMEM;
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goto err;
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}
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}
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fp->_bf._base = str;
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fp->_p = str + curpos;
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fp->_bf._size = newsize;
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w = len;
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fp->_w = newsize - curpos;
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}
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if (len < w)
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w = len;
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COPY (w); /* copy MIN(fp->_w,len), */
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fp->_w -= w;
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fp->_p += w;
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w = len; /* but pretend copied all */
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}
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else if (fp->_p > fp->_bf._base || len < fp->_bf._size)
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{
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/* pass through the buffer */
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w = MIN (len, w);
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COPY (w);
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fp->_w -= w;
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fp->_p += w;
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if (fp->_w == 0 && _fflush_r (ptr, fp))
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goto err;
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}
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else
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{
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/* write directly */
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w = ((int)MIN (len, INT_MAX)) / fp->_bf._size * fp->_bf._size;
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w = fp->_write (ptr, fp->_cookie, p, w);
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if (w <= 0)
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goto err;
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}
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p += w;
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len -= w;
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}
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while ((uio->uio_resid -= w) != 0);
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}
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else
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{
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/*
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* Line buffered: like fully buffered, but we
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* must check for newlines. Compute the distance
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* to the first newline (including the newline),
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* or `infinity' if there is none, then pretend
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* that the amount to write is MIN(len,nldist).
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*/
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nlknown = 0;
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nldist = 0;
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do
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{
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GETIOV (nlknown = 0);
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if (!nlknown)
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{
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nl = memchr ((_PTR) p, '\n', len);
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nldist = nl ? nl + 1 - p : len + 1;
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nlknown = 1;
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}
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s = MIN (len, nldist);
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w = fp->_w + fp->_bf._size;
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if (fp->_p > fp->_bf._base && s > w)
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{
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COPY (w);
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/* fp->_w -= w; */
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fp->_p += w;
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if (_fflush_r (ptr, fp))
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goto err;
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}
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else if (s >= (w = fp->_bf._size))
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{
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w = fp->_write (ptr, fp->_cookie, p, w);
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if (w <= 0)
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goto err;
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}
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else
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{
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w = s;
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COPY (w);
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fp->_w -= w;
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fp->_p += w;
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}
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if ((nldist -= w) == 0)
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{
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/* copied the newline: flush and forget */
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if (_fflush_r (ptr, fp))
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goto err;
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nlknown = 0;
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}
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p += w;
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len -= w;
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}
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while ((uio->uio_resid -= w) != 0);
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}
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return 0;
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err:
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fp->_flags |= __SERR;
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return EOF;
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}
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