diff options
Diffstat (limited to 'lib/libc/stdio/stdio.c')
| -rw-r--r-- | lib/libc/stdio/stdio.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/lib/libc/stdio/stdio.c b/lib/libc/stdio/stdio.c new file mode 100644 index 0000000..44ee0ab --- /dev/null +++ b/lib/libc/stdio/stdio.c @@ -0,0 +1,168 @@ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "namespace.h" +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include "un-namespace.h" +#include "local.h" + +/* + * Small standard I/O/seek/close functions. + */ +int +__sread(void *cookie, char *buf, int n) +{ + FILE *fp = cookie; + + return(_read(fp->_file, buf, (size_t)n)); +} + +int +__swrite(void *cookie, char const *buf, int n) +{ + FILE *fp = cookie; + + return (_write(fp->_file, buf, (size_t)n)); +} + +fpos_t +__sseek(void *cookie, fpos_t offset, int whence) +{ + FILE *fp = cookie; + + return (lseek(fp->_file, (off_t)offset, whence)); +} + +int +__sclose(void *cookie) +{ + + return (_close(((FILE *)cookie)->_file)); +} + +/* + * Higher level wrappers. + */ +int +_sread(FILE *fp, char *buf, int n) +{ + int ret; + + ret = (*fp->_read)(fp->_cookie, buf, n); + if (ret > 0) { + if (fp->_flags & __SOFF) { + if (fp->_offset <= OFF_MAX - ret) + fp->_offset += ret; + else + fp->_flags &= ~__SOFF; + } + } else if (ret < 0) + fp->_flags &= ~__SOFF; + return (ret); +} + +int +_swrite(FILE *fp, char const *buf, int n) +{ + int ret; + int serrno; + + if (fp->_flags & __SAPP) { + serrno = errno; + if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 && + (fp->_flags & __SOPT)) + return (-1); + errno = serrno; + } + ret = (*fp->_write)(fp->_cookie, buf, n); + /* __SOFF removed even on success in case O_APPEND mode is set. */ + if (ret >= 0) { + if ((fp->_flags & (__SAPP|__SOFF)) == (__SAPP|__SOFF) && + fp->_offset <= OFF_MAX - ret) + fp->_offset += ret; + else + fp->_flags &= ~__SOFF; + + } else if (ret < 0) + fp->_flags &= ~__SOFF; + return (ret); +} + +fpos_t +_sseek(FILE *fp, fpos_t offset, int whence) +{ + fpos_t ret; + int serrno, errret; + + serrno = errno; + errno = 0; + ret = (*fp->_seek)(fp->_cookie, offset, whence); + errret = errno; + if (errno == 0) + errno = serrno; + /* + * Disallow negative seeks per POSIX. + * It is needed here to help upper level caller + * in the cases it can't detect. + */ + if (ret < 0) { + if (errret == 0) { + if (offset != 0 || whence != SEEK_CUR) { + if (HASUB(fp)) + FREEUB(fp); + fp->_p = fp->_bf._base; + fp->_r = 0; + fp->_flags &= ~__SEOF; + } + fp->_flags |= __SERR; + errno = EINVAL; + } else if (errret == ESPIPE) + fp->_flags &= ~__SAPP; + fp->_flags &= ~__SOFF; + ret = -1; + } else if (fp->_flags & __SOPT) { + fp->_flags |= __SOFF; + fp->_offset = ret; + } + return (ret); +} |
