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155 lines
3.4 KiB
C
155 lines
3.4 KiB
C
/*
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* Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: makebuf.c,v 1.26 2001/10/31 16:04:08 ca Exp $")
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sm/io.h>
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#include <sm/heap.h>
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#include <sm/conf.h>
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#include "local.h"
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/*
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** SM_MAKEBUF -- make a buffer for the file
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**
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** Parameters:
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** fp -- the file to be buffered
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**
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** Returns:
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** nothing
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**
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** Allocate a file buffer, or switch to unbuffered I/O.
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** By default tty devices default to line buffered.
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*/
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void
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sm_makebuf(fp)
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register SM_FILE_T *fp;
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{
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register void *p;
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register int flags;
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size_t size;
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int couldbetty;
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if (fp->f_flags & SMNBF)
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{
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fp->f_bf.smb_base = fp->f_p = fp->f_nbuf;
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fp->f_bf.smb_size = 1;
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return;
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}
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flags = sm_whatbuf(fp, &size, &couldbetty);
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if ((p = sm_malloc(size)) == NULL)
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{
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fp->f_flags |= SMNBF;
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fp->f_bf.smb_base = fp->f_p = fp->f_nbuf;
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fp->f_bf.smb_size = 1;
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return;
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}
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if (!Sm_IO_DidInit)
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sm_init();
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flags |= SMMBF;
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fp->f_bf.smb_base = fp->f_p = p;
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fp->f_bf.smb_size = size;
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if (couldbetty && isatty(fp->f_file))
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flags |= SMLBF;
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fp->f_flags |= flags;
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}
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/*
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** SM_WHATBUF -- determine proper buffer for a file (internal)
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**
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** Plus it fills in 'bufsize' for recommended buffer size and
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** fills in flag to indicate if 'fp' could be a tty (nothing
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** to do with "betty" :-) ).
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**
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** Parameters:
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** fp -- file pointer to be buffered
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** bufsize -- new buffer size (a return)
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** couldbetty -- could be a tty (returns)
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**
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** Returns:
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** Success:
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** on error:
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** SMNPT -- not seek opimized
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** SMOPT -- seek opimized
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*/
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int
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sm_whatbuf(fp, bufsize, couldbetty)
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register SM_FILE_T *fp;
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size_t *bufsize;
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int *couldbetty;
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{
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struct stat st;
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if (fp->f_file < 0 || fstat(fp->f_file, &st) < 0)
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{
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*couldbetty = 0;
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*bufsize = SM_IO_BUFSIZ;
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return SMNPT;
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}
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/* could be a tty iff it is a character device */
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*couldbetty = S_ISCHR(st.st_mode);
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if (st.st_blksize == 0)
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{
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*bufsize = SM_IO_BUFSIZ;
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return SMNPT;
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}
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#if SM_IO_MAX_BUF_FILE > 0
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if (S_ISREG(st.st_mode) && st.st_blksize > SM_IO_MAX_BUF_FILE)
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st.st_blksize = SM_IO_MAX_BUF_FILE;
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#endif /* SM_IO_MAX_BUF_FILE > 0 */
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#if SM_IO_MAX_BUF > 0 || SM_IO_MIN_BUF > 0
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if (!S_ISREG(st.st_mode))
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{
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# if SM_IO_MAX_BUF > 0
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if (st.st_blksize > SM_IO_MAX_BUF)
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st.st_blksize = SM_IO_MAX_BUF;
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# if SM_IO_MIN_BUF > 0
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else
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# endif /* SM_IO_MIN_BUF > 0 */
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# endif /* SM_IO_MAX_BUF > 0 */
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# if SM_IO_MIN_BUF > 0
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if (st.st_blksize < SM_IO_MIN_BUF)
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st.st_blksize = SM_IO_MIN_BUF;
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# endif /* SM_IO_MIN_BUF > 0 */
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}
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#endif /* SM_IO_MAX_BUF > 0 || SM_IO_MIN_BUF > 0 */
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/*
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** Optimise fseek() only if it is a regular file. (The test for
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** sm_std_seek is mainly paranoia.) It is safe to set _blksize
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** unconditionally; it will only be used if SMOPT is also set.
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*/
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if ((fp->f_flags & SMSTR) == 0)
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{
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*bufsize = st.st_blksize;
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fp->f_blksize = st.st_blksize;
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}
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else
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*bufsize = SM_IO_BUFSIZ;
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if ((st.st_mode & S_IFMT) == S_IFREG &&
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fp->f_seek == sm_stdseek)
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return SMOPT;
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else
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return SMNPT;
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}
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