1bf6c5f18b
functions. __SERR is for user and the rest of stdio code do not check it for error sensing internally, only set it. In vf(w)printf.c here it is more easy to save __SERR, clear and restore it.
161 lines
4.1 KiB
C
161 lines
4.1 KiB
C
/*-
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* Copyright (c) 2009 David Schultz <das@FreeBSD.org>
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/param.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#include "local.h"
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static inline size_t
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p2roundup(size_t n)
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{
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if (!powerof2(n)) {
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n--;
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n |= n >> 1;
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n |= n >> 2;
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n |= n >> 4;
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n |= n >> 8;
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n |= n >> 16;
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#if SIZE_T_MAX > 0xffffffffU
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n |= n >> 32;
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#endif
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n++;
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}
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return (n);
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}
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/*
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* Expand *linep to hold len bytes (up to SSIZE_MAX + 1).
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*/
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static inline int
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expandtofit(char ** __restrict linep, size_t len, size_t * __restrict capp)
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{
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char *newline;
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size_t newcap;
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if (len > (size_t)SSIZE_MAX + 1) {
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errno = EOVERFLOW;
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return (-1);
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}
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if (len > *capp) {
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if (len == (size_t)SSIZE_MAX + 1) /* avoid overflow */
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newcap = (size_t)SSIZE_MAX + 1;
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else
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newcap = p2roundup(len);
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newline = realloc(*linep, newcap);
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if (newline == NULL)
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return (-1);
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*capp = newcap;
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*linep = newline;
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}
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return (0);
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}
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/*
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* Append the src buffer to the *dstp buffer. The buffers are of
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* length srclen and *dstlenp, respectively, and dst has space for
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* *dstlenp bytes. After the call, *dstlenp and *dstcapp are updated
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* appropriately, and *dstp is reallocated if needed. Returns 0 on
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* success, -1 on allocation failure.
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*/
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static int
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sappend(char ** __restrict dstp, size_t * __restrict dstlenp,
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size_t * __restrict dstcapp, char * __restrict src, size_t srclen)
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{
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/* ensure room for srclen + dstlen + terminating NUL */
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if (expandtofit(dstp, srclen + *dstlenp + 1, dstcapp))
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return (-1);
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memcpy(*dstp + *dstlenp, src, srclen);
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*dstlenp += srclen;
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return (0);
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}
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ssize_t
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getdelim(char ** __restrict linep, size_t * __restrict linecapp, int delim,
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FILE * __restrict fp)
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{
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u_char *endp;
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size_t linelen;
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FLOCKFILE(fp);
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ORIENT(fp, -1);
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if (linep == NULL || linecapp == NULL) {
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errno = EINVAL;
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goto error;
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}
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if (*linep == NULL)
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*linecapp = 0;
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if (fp->_r <= 0 && __srefill(fp)) {
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/* If fp is at EOF already, we just need space for the NUL. */
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if (!__sfeof(fp) || expandtofit(linep, 1, linecapp))
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goto error;
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FUNLOCKFILE(fp);
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(*linep)[0] = '\0';
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return (-1);
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}
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linelen = 0;
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while ((endp = memchr(fp->_p, delim, fp->_r)) == NULL) {
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if (sappend(linep, &linelen, linecapp, fp->_p, fp->_r))
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goto error;
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if (__srefill(fp)) {
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if (!__sfeof(fp))
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goto error;
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goto done; /* hit EOF */
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}
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}
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endp++; /* snarf the delimiter, too */
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if (sappend(linep, &linelen, linecapp, fp->_p, endp - fp->_p))
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goto error;
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fp->_r -= endp - fp->_p;
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fp->_p = endp;
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done:
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/* Invariant: *linep has space for at least linelen+1 bytes. */
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(*linep)[linelen] = '\0';
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FUNLOCKFILE(fp);
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return (linelen);
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error:
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fp->_flags |= __SERR;
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FUNLOCKFILE(fp);
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return (-1);
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}
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