692fda68c2
slightly less evil inline functions, and move the buffering state into a struct. This will make it possible for helper routines to produce output for printf() directly, making it possible to untangle the code somewhat. In wprintf(), use the same buffering mechanism to reduce diffs to printf(). This has the side-effect of causing wprintf() to catch write errors that it previously ignored.
131 lines
4.0 KiB
C
131 lines
4.0 KiB
C
/*-
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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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* This file defines common routines used by both printf and wprintf.
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* You must define CHAR to either char or wchar_t prior to including this.
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*/
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#define NIOV 8
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struct io_state {
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FILE *fp;
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struct __suio uio; /* output information: summary */
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struct __siov iov[NIOV];/* ... and individual io vectors */
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struct __siov *iovp; /* pointer to next free slot in iov */
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};
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static inline void
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io_init(struct io_state *iop, FILE *fp)
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{
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iop->uio.uio_iov = iop->iovp = iop->iov;
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iop->uio.uio_resid = 0;
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iop->uio.uio_iovcnt = 0;
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iop->fp = fp;
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}
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/*
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* WARNING: The buffer passed to io_print() is not copied immediately; it must
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* remain valid until io_flush() is called.
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*/
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static inline int
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io_print(struct io_state *iop, const CHAR * __restrict ptr, int len)
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{
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iop->iovp->iov_base = (char *)ptr;
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iop->iovp->iov_len = len;
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iop->uio.uio_resid += len;
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iop->iovp++;
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if (++iop->uio.uio_iovcnt >= NIOV) {
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iop->iovp = iop->iov;
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return (__sprint(iop->fp, &iop->uio));
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}
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return (0);
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}
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/*
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* Choose PADSIZE to trade efficiency vs. size. If larger printf
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* fields occur frequently, increase PADSIZE and make the initialisers
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* below longer.
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*/
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#define PADSIZE 16 /* pad chunk size */
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static const CHAR blanks[PADSIZE] =
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{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
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static const CHAR zeroes[PADSIZE] =
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{'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
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/*
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* Pad with blanks or zeroes. 'with' should point to either the blanks array
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* or the zeroes array.
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*/
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static inline int
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io_pad(struct io_state *iop, int howmany, const CHAR * __restrict with)
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{
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while (howmany > PADSIZE) {
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if (io_print(iop, with, PADSIZE))
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return (-1);
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howmany -= PADSIZE;
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}
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if (howmany > 0 && io_print(iop, with, howmany))
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return (-1);
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return (0);
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}
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/*
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* Print exactly len characters of the string spanning p to ep, truncating
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* or padding with 'with' as necessary.
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*/
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static inline int
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io_printandpad(struct io_state *iop, const CHAR *p, const CHAR *ep,
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int len, const CHAR * __restrict with)
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{
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int p_len;
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p_len = ep - p;
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if (p_len > len)
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p_len = len;
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if (p_len > 0 && io_print(iop, p, p_len))
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return (-1);
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return (io_pad(iop, len - (p_len > 0 ? p_len : 0), with));
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}
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static inline int
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io_flush(struct io_state *iop)
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{
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iop->iovp = iop->iov;
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return (__sprint(iop->fp, &iop->uio));
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}
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