diff options
Diffstat (limited to 'libio/fmemopen.c')
| -rw-r--r-- | libio/fmemopen.c | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/libio/fmemopen.c b/libio/fmemopen.c deleted file mode 100644 index 0b45f9c323..0000000000 --- a/libio/fmemopen.c +++ /dev/null @@ -1,227 +0,0 @@ -/* fmemopen implementation. - Copyright (C) 2015-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -/* fmemopen() from 2.22 and forward works as defined by POSIX. It also - provides an older symbol, version 2.2.5, that behaves different regarding - SEEK_END (libio/oldfmemopen.c). */ - - -#include <errno.h> -#include <libio.h> -#include <stdio.h> -#include <stdlib.h> -#include <stdint.h> -#include <string.h> -#include <sys/types.h> -#include "libioP.h" - - -typedef struct fmemopen_cookie_struct fmemopen_cookie_t; -struct fmemopen_cookie_struct -{ - char *buffer; /* memory buffer. */ - int mybuffer; /* allocated my buffer? */ - int append; /* buffer open for append? */ - size_t size; /* buffer length in bytes. */ - _IO_off64_t pos; /* current position at the buffer. */ - size_t maxpos; /* max position in buffer. */ -}; - - -static ssize_t -fmemopen_read (void *cookie, char *b, size_t s) -{ - fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie; - - if (c->pos + s > c->maxpos) - { - s = c->maxpos - c->pos; - if ((size_t) c->pos > c->maxpos) - s = 0; - } - - memcpy (b, &(c->buffer[c->pos]), s); - - c->pos += s; - - return s; -} - - -static ssize_t -fmemopen_write (void *cookie, const char *b, size_t s) -{ - fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie;; - _IO_off64_t pos = c->append ? c->maxpos : c->pos; - int addnullc = (s == 0 || b[s - 1] != '\0'); - - if (pos + s > c->size) - { - if ((size_t) (c->pos + addnullc) >= c->size) - { - __set_errno (ENOSPC); - return 0; - } - s = c->size - pos; - } - - memcpy (&(c->buffer[pos]), b, s); - - c->pos = pos + s; - if ((size_t) c->pos > c->maxpos) - { - c->maxpos = c->pos; - if (c->maxpos < c->size && addnullc) - c->buffer[c->maxpos] = '\0'; - /* A null byte is written in a stream open for update iff it fits. */ - else if (c->append == 0 && addnullc != 0) - c->buffer[c->size-1] = '\0'; - } - - return s; -} - - -static int -fmemopen_seek (void *cookie, _IO_off64_t *p, int w) -{ - _IO_off64_t np; - fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie; - - switch (w) - { - case SEEK_SET: - np = *p; - break; - - case SEEK_CUR: - np = c->pos + *p; - break; - - case SEEK_END: - np = c->maxpos + *p; - break; - - default: - return -1; - } - - if (np < 0 || (size_t) np > c->size) - { - __set_errno (EINVAL); - return -1; - } - - *p = c->pos = np; - - return 0; -} - - -static int -fmemopen_close (void *cookie) -{ - fmemopen_cookie_t *c = (fmemopen_cookie_t *) cookie; - - if (c->mybuffer) - free (c->buffer); - free (c); - - return 0; -} - - -FILE * -__fmemopen (void *buf, size_t len, const char *mode) -{ - cookie_io_functions_t iof; - fmemopen_cookie_t *c; - FILE *result; - - c = (fmemopen_cookie_t *) calloc (sizeof (fmemopen_cookie_t), 1); - if (c == NULL) - return NULL; - - c->mybuffer = (buf == NULL); - - if (c->mybuffer) - { - c->buffer = (char *) malloc (len); - if (c->buffer == NULL) - { - free (c); - return NULL; - } - c->buffer[0] = '\0'; - } - else - { - if (__glibc_unlikely ((uintptr_t) len > -(uintptr_t) buf)) - { - free (c); - __set_errno (EINVAL); - return NULL; - } - - c->buffer = buf; - - /* POSIX states that w+ mode should truncate the buffer. */ - if (mode[0] == 'w' && mode[1] == '+') - c->buffer[0] = '\0'; - - if (mode[0] == 'a') - c->maxpos = strnlen (c->buffer, len); - } - - - /* Mode | starting position (cookie::pos) | size (cookie::size) - ------ |----------------------------------|----------------------------- - read | beginning of the buffer | size argument - write | beginning of the buffer | zero - append | first null or size buffer + 1 | first null or size argument - */ - - c->size = len; - - if (mode[0] == 'r') - c->maxpos = len; - - c->append = mode[0] == 'a'; - if (c->append) - c->pos = c->maxpos; - else - c->pos = 0; - - iof.read = fmemopen_read; - iof.write = fmemopen_write; - iof.seek = fmemopen_seek; - iof.close = fmemopen_close; - - result = _IO_fopencookie (c, mode, iof); - if (__glibc_unlikely (result == NULL)) - { - if (c->mybuffer) - free (c->buffer); - - free (c); - } - - return result; -} -libc_hidden_def (__fmemopen) -versioned_symbol (libc, __fmemopen, fmemopen, GLIBC_2_22); |