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