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/* fmemopen implementation.
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Copyright (C) 2015-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* fmemopen() from 2.22 and forward works as defined by POSIX. It also
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provides an older symbol, version 2.2.5, that behaves different regarding
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SEEK_END (libio/oldfmemopen.c). */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/types.h>
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#include "libioP.h"
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typedef struct fmemopen_cookie_struct fmemopen_cookie_t;
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struct fmemopen_cookie_struct
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{
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char *buffer; /* memory buffer. */
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int mybuffer; /* allocated my buffer? */
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int append; /* buffer open for append? */
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size_t size; /* buffer length in bytes. */
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off64_t pos; /* current position at the buffer. */
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size_t maxpos; /* max position in buffer. */
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};
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static ssize_t
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fmemopen_read (void *cookie, char *b, size_t s)
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{
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fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie;
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if (c->pos + s > c->maxpos)
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{
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s = c->maxpos - c->pos;
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if ((size_t) c->pos > c->maxpos)
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s = 0;
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}
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memcpy (b, &(c->buffer[c->pos]), s);
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c->pos += s;
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return s;
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}
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static ssize_t
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fmemopen_write (void *cookie, const char *b, size_t s)
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{
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fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie;;
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off64_t pos = c->append ? c->maxpos : c->pos;
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int addnullc = (s == 0 || b[s - 1] != '\0');
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if (pos + s > c->size)
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{
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if ((size_t) (c->pos + addnullc) >= c->size)
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{
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__set_errno (ENOSPC);
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return 0;
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}
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s = c->size - pos;
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}
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memcpy (&(c->buffer[pos]), b, s);
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c->pos = pos + s;
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if ((size_t) c->pos > c->maxpos)
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{
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c->maxpos = c->pos;
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if (c->maxpos < c->size && addnullc)
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c->buffer[c->maxpos] = '\0';
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/* A null byte is written in a stream open for update iff it fits. */
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else if (c->append == 0 && addnullc != 0)
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c->buffer[c->size-1] = '\0';
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}
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return s;
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}
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static int
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fmemopen_seek (void *cookie, off64_t *p, int w)
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{
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off64_t np;
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fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie;
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switch (w)
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{
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case SEEK_SET:
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np = *p;
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break;
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case SEEK_CUR:
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np = c->pos + *p;
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break;
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case SEEK_END:
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np = c->maxpos + *p;
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break;
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default:
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return -1;
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}
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if (np < 0 || (size_t) np > c->size)
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{
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__set_errno (EINVAL);
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return -1;
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}
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*p = c->pos = np;
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return 0;
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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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fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie;
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if (c->mybuffer)
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free (c->buffer);
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free (c);
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return 0;
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}
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FILE *
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__fmemopen (void *buf, size_t len, const char *mode)
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{
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cookie_io_functions_t iof;
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fmemopen_cookie_t *c;
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FILE *result;
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c = (fmemopen_cookie_t *) calloc (sizeof (fmemopen_cookie_t), 1);
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if (c == NULL)
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return NULL;
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c->mybuffer = (buf == NULL);
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if (c->mybuffer)
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{
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c->buffer = (char *) malloc (len);
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if (c->buffer == NULL)
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{
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free (c);
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return NULL;
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}
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c->buffer[0] = '\0';
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}
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else
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{
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if (__glibc_unlikely ((uintptr_t) len > -(uintptr_t) buf))
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{
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free (c);
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__set_errno (EINVAL);
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return NULL;
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}
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c->buffer = buf;
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/* POSIX states that w+ mode should truncate the buffer. */
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if (mode[0] == 'w' && mode[1] == '+')
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c->buffer[0] = '\0';
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if (mode[0] == 'a')
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c->maxpos = strnlen (c->buffer, len);
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}
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/* Mode | starting position (cookie::pos) | size (cookie::size)
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------ |----------------------------------|-----------------------------
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read | beginning of the buffer | size argument
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write | beginning of the buffer | zero
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append | first null or size buffer + 1 | first null or size argument
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*/
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c->size = len;
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if (mode[0] == 'r')
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c->maxpos = len;
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c->append = mode[0] == 'a';
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if (c->append)
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c->pos = c->maxpos;
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else
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c->pos = 0;
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iof.read = fmemopen_read;
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iof.write = fmemopen_write;
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iof.seek = fmemopen_seek;
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iof.close = fmemopen_close;
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result = _IO_fopencookie (c, mode, iof);
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if (__glibc_unlikely (result == NULL))
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{
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if (c->mybuffer)
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free (c->buffer);
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free (c);
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}
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return result;
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}
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libc_hidden_def (__fmemopen)
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versioned_symbol (libc, __fmemopen, fmemopen, GLIBC_2_22);
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