mirror of
https://github.com/freebsd/freebsd-src
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Add fmemopen(3), an interface to get a FILE * from a buffer in memory, along
with the respective regression test. See http://pubs.opengroup.org/onlinepubs/9699919799/functions/fmemopen.html Reviewed by: cognet Approved by: cognet
This commit is contained in:
parent
9005607c8f
commit
96c95412ca
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=246120
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@ -343,6 +343,7 @@ char *tempnam(const char *, const char *);
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#endif
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#endif
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#if __BSD_VISIBLE || __POSIX_VISIBLE >= 200809
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#if __BSD_VISIBLE || __POSIX_VISIBLE >= 200809
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FILE *fmemopen(void * __restrict, size_t, const char * __restrict);
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ssize_t getdelim(char ** __restrict, size_t * __restrict, int,
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ssize_t getdelim(char ** __restrict, size_t * __restrict, int,
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FILE * __restrict);
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FILE * __restrict);
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int renameat(int, const char *, int, const char *);
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int renameat(int, const char *, int, const char *);
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@ -8,7 +8,8 @@ SRCS+= _flock_stub.c asprintf.c clrerr.c dprintf.c \
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fclose.c fcloseall.c fdopen.c \
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fclose.c fcloseall.c fdopen.c \
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feof.c ferror.c fflush.c fgetc.c fgetln.c fgetpos.c fgets.c fgetwc.c \
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feof.c ferror.c fflush.c fgetc.c fgetln.c fgetpos.c fgets.c fgetwc.c \
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fgetwln.c fgetws.c \
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fgetwln.c fgetws.c \
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fileno.c findfp.c flags.c fopen.c fprintf.c fpurge.c fputc.c fputs.c \
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fileno.c findfp.c flags.c fmemopen.c fopen.c fprintf.c fpurge.c \
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fputc.c fputs.c \
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fputwc.c fputws.c fread.c freopen.c fscanf.c fseek.c fsetpos.c \
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fputwc.c fputws.c fread.c freopen.c fscanf.c fseek.c fsetpos.c \
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ftell.c funopen.c fvwrite.c fwalk.c fwide.c fwprintf.c fwscanf.c \
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ftell.c funopen.c fvwrite.c fwalk.c fwide.c fwprintf.c fwscanf.c \
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fwrite.c getc.c getchar.c getdelim.c getline.c \
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fwrite.c getc.c getchar.c getdelim.c getline.c \
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@ -48,7 +49,7 @@ MLINKS+=ferror.3 ferror_unlocked.3 \
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MLINKS+=fflush.3 fpurge.3
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MLINKS+=fflush.3 fpurge.3
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MLINKS+=fgets.3 gets.3
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MLINKS+=fgets.3 gets.3
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MLINKS+=flockfile.3 ftrylockfile.3 flockfile.3 funlockfile.3
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MLINKS+=flockfile.3 ftrylockfile.3 flockfile.3 funlockfile.3
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MLINKS+=fopen.3 fdopen.3 fopen.3 freopen.3
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MLINKS+=fopen.3 fdopen.3 fopen.3 freopen.3 fopen.3 fmemopen.3
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MLINKS+=fputs.3 puts.3
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MLINKS+=fputs.3 puts.3
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MLINKS+=fread.3 fwrite.3
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MLINKS+=fread.3 fwrite.3
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MLINKS+=fseek.3 fgetpos.3 fseek.3 fseeko.3 fseek.3 fsetpos.3 fseek.3 ftell.3 \
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MLINKS+=fseek.3 fgetpos.3 fseek.3 fseeko.3 fseek.3 fsetpos.3 fseek.3 ftell.3 \
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@ -155,6 +155,7 @@ FBSD_1.3 {
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getwchar_l;
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getwchar_l;
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putwc_l;
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putwc_l;
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putwchar_l;
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putwchar_l;
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fmemopen;
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};
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};
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FBSDprivate_1.0 {
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FBSDprivate_1.0 {
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182
lib/libc/stdio/fmemopen.c
Normal file
182
lib/libc/stdio/fmemopen.c
Normal file
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@ -0,0 +1,182 @@
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/*-
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Copyright (C) 2013 Pietro Cerutti <gahr@FreeBSD.org>
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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 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 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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struct __fmemopen_cookie
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{
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char *buf; /* pointer to the memory region */
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char own; /* did we allocate the buffer ourselves? */
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long len; /* buffer length in bytes */
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long off; /* current offset into the buffer */
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};
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static int fmemopen_read (void *cookie, char *buf, int nbytes);
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static int fmemopen_write (void *cookie, const char *buf, int nbytes);
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static fpos_t fmemopen_seek (void *cookie, fpos_t offset, int whence);
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static int fmemopen_close (void *cookie);
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FILE *
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fmemopen (void * __restrict buf, size_t size, const char * __restrict mode)
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{
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/* allocate cookie */
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struct __fmemopen_cookie *ck = malloc (sizeof (struct __fmemopen_cookie));
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if (ck == NULL) {
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errno = ENOMEM;
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return (NULL);
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}
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ck->off = 0;
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ck->len = size;
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/* do we have to allocate the buffer ourselves? */
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ck->own = ((ck->buf = buf) == NULL);
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if (ck->own) {
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ck->buf = malloc (size);
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if (ck->buf == NULL) {
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free (ck);
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errno = ENOMEM;
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return (NULL);
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}
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ck->buf[0] = '\0';
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}
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if (mode[0] == 'a')
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ck->off = strnlen(ck->buf, ck->len);
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/* actuall wrapper */
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FILE *f = funopen ((void *)ck, fmemopen_read, fmemopen_write,
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fmemopen_seek, fmemopen_close);
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if (f == NULL) {
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if (ck->own)
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free (ck->buf);
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free (ck);
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return (NULL);
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}
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/* turn off buffering, so a write past the end of the buffer
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* correctly returns a short object count */
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setvbuf (f, (char *) NULL, _IONBF, 0);
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return (f);
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}
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static int
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fmemopen_read (void *cookie, char *buf, int nbytes)
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{
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struct __fmemopen_cookie *ck = cookie;
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if (nbytes > ck->len - ck->off)
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nbytes = ck->len - ck->off;
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if (nbytes == 0)
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return (0);
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memcpy (buf, ck->buf + ck->off, nbytes);
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ck->off += nbytes;
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return (nbytes);
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}
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static int
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fmemopen_write (void *cookie, const char *buf, int nbytes)
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{
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struct __fmemopen_cookie *ck = cookie;
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if (nbytes > ck->len - ck->off)
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nbytes = ck->len - ck->off;
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if (nbytes == 0)
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return (0);
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memcpy (ck->buf + ck->off, buf, nbytes);
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ck->off += nbytes;
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if (ck->off < ck->len && ck->buf[ck->off - 1] != '\0')
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ck->buf[ck->off] = '\0';
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return (nbytes);
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}
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static fpos_t
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fmemopen_seek (void *cookie, fpos_t offset, int whence)
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{
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struct __fmemopen_cookie *ck = cookie;
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switch (whence) {
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case SEEK_SET:
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if (offset > ck->len) {
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errno = EINVAL;
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return (-1);
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}
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ck->off = offset;
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break;
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case SEEK_CUR:
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if (ck->off + offset > ck->len) {
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errno = EINVAL;
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return (-1);
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}
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ck->off += offset;
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break;
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case SEEK_END:
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if (offset > 0 || -offset > ck->len) {
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errno = EINVAL;
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return (-1);
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}
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ck->off = ck->len + offset;
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break;
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default:
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errno = EINVAL;
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return (-1);
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}
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return (ck->off);
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}
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static int
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fmemopen_close (void *cookie)
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{
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struct __fmemopen_cookie *ck = cookie;
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if (ck->own)
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free (ck->buf);
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free (ck);
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return (0);
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}
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@ -32,13 +32,14 @@
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.\" @(#)fopen.3 8.1 (Berkeley) 6/4/93
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.\" @(#)fopen.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\" $FreeBSD$
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.\"
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.\"
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.Dd November 30, 2012
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.Dd January 30, 2013
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.Dt FOPEN 3
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.Dt FOPEN 3
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.Os
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.Os
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.Sh NAME
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.Sh NAME
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.Nm fopen ,
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.Nm fopen ,
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.Nm fdopen ,
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.Nm fdopen ,
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.Nm freopen
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.Nm freopen ,
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.Nm fmemopen
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.Nd stream open functions
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.Nd stream open functions
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.Sh LIBRARY
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.Sh LIBRARY
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.Lb libc
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.Lb libc
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@ -50,6 +51,8 @@
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.Fn fdopen "int fildes" "const char *mode"
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.Fn fdopen "int fildes" "const char *mode"
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.Ft FILE *
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.Ft FILE *
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.Fn freopen "const char *path" "const char *mode" "FILE *stream"
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.Fn freopen "const char *path" "const char *mode" "FILE *stream"
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.Ft FILE *
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.Fn fmemopen "void *restrict *buf" "size_t size" "const char * restrict mode"
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.Sh DESCRIPTION
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.Sh DESCRIPTION
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The
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The
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.Fn fopen
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.Fn fopen
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@ -202,6 +205,29 @@ standard text stream
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.Dv ( stderr , stdin ,
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.Dv ( stderr , stdin ,
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or
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or
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.Dv stdout ) .
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.Dv stdout ) .
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.Pp
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The
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.Fn fmemopen
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function
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associates the buffer given by the
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.Fa buf
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and
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.Fa size
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arguments with a stream.
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The
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.Fa buf
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argument shall be either a null pointer or point to a buffer that
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is at least
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.Fa size
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bytes long.
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If a null pointer is specified as the
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.Fa buf
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argument,
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.Fn fmemopen
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shall allocate
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.Fa size
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bytes of memory. This buffer shall be automatically freed when the
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stream is closed.
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.Sh RETURN VALUES
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.Sh RETURN VALUES
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Upon successful completion
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Upon successful completion
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.Fn fopen ,
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.Fn fopen ,
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@ -225,16 +251,18 @@ argument
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to
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to
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.Fn fopen ,
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.Fn fopen ,
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.Fn fdopen ,
|
.Fn fdopen ,
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|
.Fn freopen ,
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or
|
or
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.Fn freopen
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.Fn fmemopen
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was invalid.
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was invalid.
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.El
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.El
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.Pp
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.Pp
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||||||
The
|
The
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.Fn fopen ,
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.Fn fopen ,
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.Fn fdopen
|
.Fn fdopen ,
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and
|
|
||||||
.Fn freopen
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.Fn freopen
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|
and
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.Fn fmemopen
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functions
|
functions
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may also fail and set
|
may also fail and set
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||||||
.Va errno
|
.Va errno
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||||||
|
@ -294,3 +322,8 @@ The
|
||||||
.Dq Li e
|
.Dq Li e
|
||||||
mode option does not conform to any standard
|
mode option does not conform to any standard
|
||||||
but is also supported by glibc.
|
but is also supported by glibc.
|
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|
The
|
||||||
|
.Fn fmemopen
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||||||
|
function
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|
conforms to
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|
.St -p1003.1-2008 .
|
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|
|
143
tools/regression/lib/libc/stdio/test-fmemopen.c
Normal file
143
tools/regression/lib/libc/stdio/test-fmemopen.c
Normal file
|
@ -0,0 +1,143 @@
|
||||||
|
/*-
|
||||||
|
Copyright (C) 2013 Pietro Cerutti <gahr@FreeBSD.org>
|
||||||
|
|
||||||
|
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.
|
||||||
|
|
||||||
|
THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Test basic FILE * functions (fread, fwrite, fseek, fclose) against
|
||||||
|
* a FILE * retrieved using fmemopen()
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <sys/cdefs.h>
|
||||||
|
__FBSDID("$FreeBSD$");
|
||||||
|
|
||||||
|
#include <assert.h>
|
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|
#include <errno.h>
|
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|
#include <stdio.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <strings.h>
|
||||||
|
|
||||||
|
void
|
||||||
|
test_preexisting ()
|
||||||
|
{
|
||||||
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/*
|
||||||
|
* use a pre-existing buffer
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||||||
|
*/
|
||||||
|
|
||||||
|
char buf[512];
|
||||||
|
char buf2[512];
|
||||||
|
char str[] = "Test writing some stuff";
|
||||||
|
char str2[] = "AAAAAAAAA";
|
||||||
|
char str3[] = "AAAA writing some stuff";
|
||||||
|
FILE *fp;
|
||||||
|
size_t nofw, nofr;
|
||||||
|
int rc;
|
||||||
|
|
||||||
|
/* open a FILE * using fmemopen */
|
||||||
|
fp = fmemopen (buf, sizeof buf, "w");
|
||||||
|
assert (fp != NULL);
|
||||||
|
|
||||||
|
/* write to the buffer */
|
||||||
|
nofw = fwrite (str, 1, sizeof str, fp);
|
||||||
|
assert (nofw == sizeof str);
|
||||||
|
|
||||||
|
/* close the FILE * */
|
||||||
|
rc = fclose (fp);
|
||||||
|
assert (rc == 0);
|
||||||
|
|
||||||
|
/* re-open the FILE * to read back the data */
|
||||||
|
fp = fmemopen (buf, sizeof buf, "r");
|
||||||
|
assert (fp != NULL);
|
||||||
|
|
||||||
|
/* read from the buffer */
|
||||||
|
bzero (buf2, sizeof buf2);
|
||||||
|
nofr = fread (buf2, 1, sizeof buf2, fp);
|
||||||
|
assert (nofr == sizeof buf2);
|
||||||
|
|
||||||
|
/* since a write on a FILE * retrieved by fmemopen
|
||||||
|
* will add a '\0' (if there's space), we can check
|
||||||
|
* the strings for equality */
|
||||||
|
assert (strcmp(str, buf2) == 0);
|
||||||
|
|
||||||
|
/* close the FILE * */
|
||||||
|
rc = fclose (fp);
|
||||||
|
assert (rc == 0);
|
||||||
|
|
||||||
|
/* now open a FILE * on the first 4 bytes of the string */
|
||||||
|
fp = fmemopen (str, 4, "w");
|
||||||
|
assert (fp != NULL);
|
||||||
|
|
||||||
|
/* try to write more bytes than we shoud, we'll get a short count (4) */
|
||||||
|
nofw = fwrite (str2, 1, sizeof str2, fp);
|
||||||
|
assert (nofw == 4);
|
||||||
|
|
||||||
|
/* close the FILE * */
|
||||||
|
rc = fclose (fp);
|
||||||
|
|
||||||
|
/* check that the string was not modified after the first 4 bytes */
|
||||||
|
assert (strcmp (str, str3) == 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
void
|
||||||
|
test_autoalloc ()
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* let fmemopen allocate the buffer
|
||||||
|
*/
|
||||||
|
|
||||||
|
char str[] = "A quick test";
|
||||||
|
FILE *fp;
|
||||||
|
long pos;
|
||||||
|
size_t nofw, nofr, i;
|
||||||
|
int rc;
|
||||||
|
|
||||||
|
/* open a FILE * using fmemopen */
|
||||||
|
fp = fmemopen (NULL, 512, "w");
|
||||||
|
assert (fp != NULL);
|
||||||
|
|
||||||
|
/* fill the buffer */
|
||||||
|
for (i = 0; i < 512; i++) {
|
||||||
|
nofw = fwrite ("a", 1, 1, fp);
|
||||||
|
assert (nofw == 1);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* get the current position into the stream */
|
||||||
|
pos = ftell (fp);
|
||||||
|
assert (pos == 512);
|
||||||
|
|
||||||
|
/* try to write past the end, we should get a short object count (0) */
|
||||||
|
nofw = fwrite ("a", 1, 1, fp);
|
||||||
|
assert (nofw == 0);
|
||||||
|
|
||||||
|
/* close the FILE * */
|
||||||
|
rc = fclose (fp);
|
||||||
|
assert (rc == 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
main (void)
|
||||||
|
{
|
||||||
|
test_autoalloc ();
|
||||||
|
test_preexisting ();
|
||||||
|
return (0);
|
||||||
|
}
|
10
tools/regression/lib/libc/stdio/test-fmemopen.t
Normal file
10
tools/regression/lib/libc/stdio/test-fmemopen.t
Normal file
|
@ -0,0 +1,10 @@
|
||||||
|
#!/bin/sh
|
||||||
|
# $FreeBSD$
|
||||||
|
|
||||||
|
cd `dirname $0`
|
||||||
|
|
||||||
|
executable=`basename $0 .t`
|
||||||
|
|
||||||
|
make $executable 2>&1 > /dev/null
|
||||||
|
|
||||||
|
exec ./$executable
|
Loading…
Reference in a new issue