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Diffstat (limited to 'newlib/libc/stdio/fmemopen.c')
-rw-r--r--newlib/libc/stdio/fmemopen.c371
1 files changed, 0 insertions, 371 deletions
diff --git a/newlib/libc/stdio/fmemopen.c b/newlib/libc/stdio/fmemopen.c
deleted file mode 100644
index acfb23c1b..000000000
--- a/newlib/libc/stdio/fmemopen.c
+++ /dev/null
@@ -1,371 +0,0 @@
-/* Copyright (C) 2007 Eric Blake
- * Permission to use, copy, modify, and distribute this software
- * is freely granted, provided that this notice is preserved.
- */
-
-/*
-FUNCTION
-<<fmemopen>>---open a stream around a fixed-length string
-
-INDEX
- fmemopen
-
-ANSI_SYNOPSIS
- #include <stdio.h>
- FILE *fmemopen(void *restrict <[buf]>, size_t <[size]>,
- const char *restrict <[mode]>);
-
-DESCRIPTION
-<<fmemopen>> creates a seekable <<FILE>> stream that wraps a
-fixed-length buffer of <[size]> bytes starting at <[buf]>. The stream
-is opened with <[mode]> treated as in <<fopen>>, where append mode
-starts writing at the first NUL byte. If <[buf]> is NULL, then
-<[size]> bytes are automatically provided as if by <<malloc>>, with
-the initial size of 0, and <[mode]> must contain <<+>> so that data
-can be read after it is written.
-
-The stream maintains a current position, which moves according to
-bytes read or written, and which can be one past the end of the array.
-The stream also maintains a current file size, which is never greater
-than <[size]>. If <[mode]> starts with <<r>>, the position starts at
-<<0>>, and file size starts at <[size]> if <[buf]> was provided. If
-<[mode]> starts with <<w>>, the position and file size start at <<0>>,
-and if <[buf]> was provided, the first byte is set to NUL. If
-<[mode]> starts with <<a>>, the position and file size start at the
-location of the first NUL byte, or else <[size]> if <[buf]> was
-provided.
-
-When reading, NUL bytes have no significance, and reads cannot exceed
-the current file size. When writing, the file size can increase up to
-<[size]> as needed, and NUL bytes may be embedded in the stream (see
-<<open_memstream>> for an alternative that automatically enlarges the
-buffer). When the stream is flushed or closed after a write that
-changed the file size, a NUL byte is written at the current position
-if there is still room; if the stream is not also open for reading, a
-NUL byte is additionally written at the last byte of <[buf]> when the
-stream has exceeded <[size]>, so that a write-only <[buf]> is always
-NUL-terminated when the stream is flushed or closed (and the initial
-<[size]> should take this into account). It is not possible to seek
-outside the bounds of <[size]>. A NUL byte written during a flush is
-restored to its previous value when seeking elsewhere in the string.
-
-RETURNS
-The return value is an open FILE pointer on success. On error,
-<<NULL>> is returned, and <<errno>> will be set to EINVAL if <[size]>
-is zero or <[mode]> is invalid, ENOMEM if <[buf]> was NULL and memory
-could not be allocated, or EMFILE if too many streams are already
-open.
-
-PORTABILITY
-This function is being added to POSIX 200x, but is not in POSIX 2001.
-
-Supporting OS subroutines required: <<sbrk>>.
-*/
-
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <sys/lock.h>
-#include "local.h"
-
-/* Describe details of an open memstream. */
-typedef struct fmemcookie {
- void *storage; /* storage to free on close */
- char *buf; /* buffer start */
- size_t pos; /* current position */
- size_t eof; /* current file size */
- size_t max; /* maximum file size */
- char append; /* nonzero if appending */
- char writeonly; /* 1 if write-only */
- char saved; /* saved character that lived at pos before write-only NUL */
-} fmemcookie;
-
-/* Read up to non-zero N bytes into BUF from stream described by
- COOKIE; return number of bytes read (0 on EOF). */
-static _READ_WRITE_RETURN_TYPE
-_DEFUN(fmemreader, (ptr, cookie, buf, n),
- struct _reent *ptr _AND
- void *cookie _AND
- char *buf _AND
- int n)
-{
- fmemcookie *c = (fmemcookie *) cookie;
- /* Can't read beyond current size, but EOF condition is not an error. */
- if (c->pos > c->eof)
- return 0;
- if (n >= c->eof - c->pos)
- n = c->eof - c->pos;
- memcpy (buf, c->buf + c->pos, n);
- c->pos += n;
- return n;
-}
-
-/* Write up to non-zero N bytes of BUF into the stream described by COOKIE,
- returning the number of bytes written or EOF on failure. */
-static _READ_WRITE_RETURN_TYPE
-_DEFUN(fmemwriter, (ptr, cookie, buf, n),
- struct _reent *ptr _AND
- void *cookie _AND
- const char *buf _AND
- int n)
-{
- fmemcookie *c = (fmemcookie *) cookie;
- int adjust = 0; /* true if at EOF, but still need to write NUL. */
-
- /* Append always seeks to eof; otherwise, if we have previously done
- a seek beyond eof, ensure all intermediate bytes are NUL. */
- if (c->append)
- c->pos = c->eof;
- else if (c->pos > c->eof)
- memset (c->buf + c->eof, '\0', c->pos - c->eof);
- /* Do not write beyond EOF; saving room for NUL on write-only stream. */
- if (c->pos + n > c->max - c->writeonly)
- {
- adjust = c->writeonly;
- n = c->max - c->pos;
- }
- /* Now n is the number of bytes being modified, and adjust is 1 if
- the last byte is NUL instead of from buf. Write a NUL if
- write-only; or if read-write, eof changed, and there is still
- room. When we are within the file contents, remember what we
- overwrite so we can restore it if we seek elsewhere later. */
- if (c->pos + n > c->eof)
- {
- c->eof = c->pos + n;
- if (c->eof - adjust < c->max)
- c->saved = c->buf[c->eof - adjust] = '\0';
- }
- else if (c->writeonly)
- {
- if (n)
- {
- c->saved = c->buf[c->pos + n - adjust];
- c->buf[c->pos + n - adjust] = '\0';
- }
- else
- adjust = 0;
- }
- c->pos += n;
- if (n - adjust)
- memcpy (c->buf + c->pos - n, buf, n - adjust);
- else
- {
- ptr->_errno = ENOSPC;
- return EOF;
- }
- return n;
-}
-
-/* Seek to position POS relative to WHENCE within stream described by
- COOKIE; return resulting position or fail with EOF. */
-static _fpos_t
-_DEFUN(fmemseeker, (ptr, cookie, pos, whence),
- struct _reent *ptr _AND
- void *cookie _AND
- _fpos_t pos _AND
- int whence)
-{
- fmemcookie *c = (fmemcookie *) cookie;
-#ifndef __LARGE64_FILES
- off_t offset = (off_t) pos;
-#else /* __LARGE64_FILES */
- _off64_t offset = (_off64_t) pos;
-#endif /* __LARGE64_FILES */
-
- if (whence == SEEK_CUR)
- offset += c->pos;
- else if (whence == SEEK_END)
- offset += c->eof;
- if (offset < 0)
- {
- ptr->_errno = EINVAL;
- offset = -1;
- }
- else if (offset > c->max)
- {
- ptr->_errno = ENOSPC;
- offset = -1;
- }
-#ifdef __LARGE64_FILES
- else if ((_fpos_t) offset != offset)
- {
- ptr->_errno = EOVERFLOW;
- offset = -1;
- }
-#endif /* __LARGE64_FILES */
- else
- {
- if (c->writeonly && c->pos < c->eof)
- {
- c->buf[c->pos] = c->saved;
- c->saved = '\0';
- }
- c->pos = offset;
- if (c->writeonly && c->pos < c->eof)
- {
- c->saved = c->buf[c->pos];
- c->buf[c->pos] = '\0';
- }
- }
- return (_fpos_t) offset;
-}
-
-/* Seek to position POS relative to WHENCE within stream described by
- COOKIE; return resulting position or fail with EOF. */
-#ifdef __LARGE64_FILES
-static _fpos64_t
-_DEFUN(fmemseeker64, (ptr, cookie, pos, whence),
- struct _reent *ptr _AND
- void *cookie _AND
- _fpos64_t pos _AND
- int whence)
-{
- _off64_t offset = (_off64_t) pos;
- fmemcookie *c = (fmemcookie *) cookie;
- if (whence == SEEK_CUR)
- offset += c->pos;
- else if (whence == SEEK_END)
- offset += c->eof;
- if (offset < 0)
- {
- ptr->_errno = EINVAL;
- offset = -1;
- }
- else if (offset > c->max)
- {
- ptr->_errno = ENOSPC;
- offset = -1;
- }
- else
- {
- if (c->writeonly && c->pos < c->eof)
- {
- c->buf[c->pos] = c->saved;
- c->saved = '\0';
- }
- c->pos = offset;
- if (c->writeonly && c->pos < c->eof)
- {
- c->saved = c->buf[c->pos];
- c->buf[c->pos] = '\0';
- }
- }
- return (_fpos64_t) offset;
-}
-#endif /* __LARGE64_FILES */
-
-/* Reclaim resources used by stream described by COOKIE. */
-static int
-_DEFUN(fmemcloser, (ptr, cookie),
- struct _reent *ptr _AND
- void *cookie)
-{
- fmemcookie *c = (fmemcookie *) cookie;
- _free_r (ptr, c->storage);
- return 0;
-}
-
-/* Open a memstream around buffer BUF of SIZE bytes, using MODE.
- Return the new stream, or fail with NULL. */
-FILE *
-_DEFUN(_fmemopen_r, (ptr, buf, size, mode),
- struct _reent *ptr _AND
- void *buf _AND
- size_t size _AND
- const char *mode)
-{
- FILE *fp;
- fmemcookie *c;
- int flags;
- int dummy;
-
- if ((flags = __sflags (ptr, mode, &dummy)) == 0)
- return NULL;
- if (!size || !(buf || flags & __SRW))
- {
- ptr->_errno = EINVAL;
- return NULL;
- }
- if ((fp = __sfp (ptr)) == NULL)
- return NULL;
- if ((c = (fmemcookie *) _malloc_r (ptr, sizeof *c + (buf ? 0 : size)))
- == NULL)
- {
- _newlib_sfp_lock_start ();
- fp->_flags = 0; /* release */
-#ifndef __SINGLE_THREAD__
- __lock_close_recursive (fp->_lock);
-#endif
- _newlib_sfp_lock_end ();
- return NULL;
- }
-
- c->storage = c;
- c->max = size;
- /* 9 modes to worry about. */
- /* w/a, buf or no buf: Guarantee a NUL after any file writes. */
- c->writeonly = (flags & __SWR) != 0;
- c->saved = '\0';
- if (!buf)
- {
- /* r+/w+/a+, and no buf: file starts empty. */
- c->buf = (char *) (c + 1);
- c->buf[0] = '\0';
- c->pos = c->eof = 0;
- c->append = (flags & __SAPP) != 0;
- }
- else
- {
- c->buf = (char *) buf;
- switch (*mode)
- {
- case 'a':
- /* a/a+ and buf: position and size at first NUL. */
- buf = memchr (c->buf, '\0', size);
- c->eof = c->pos = buf ? (char *) buf - c->buf : size;
- if (!buf && c->writeonly)
- /* a: guarantee a NUL within size even if no writes. */
- c->buf[size - 1] = '\0';
- c->append = 1;
- break;
- case 'r':
- /* r/r+ and buf: read at beginning, full size available. */
- c->pos = c->append = 0;
- c->eof = size;
- break;
- case 'w':
- /* w/w+ and buf: write at beginning, truncate to empty. */
- c->pos = c->append = c->eof = 0;
- *c->buf = '\0';
- break;
- default:
- abort ();
- }
- }
-
- _newlib_flockfile_start (fp);
- fp->_file = -1;
- fp->_flags = flags;
- fp->_cookie = c;
- fp->_read = flags & (__SRD | __SRW) ? fmemreader : NULL;
- fp->_write = flags & (__SWR | __SRW) ? fmemwriter : NULL;
- fp->_seek = fmemseeker;
-#ifdef __LARGE64_FILES
- fp->_seek64 = fmemseeker64;
- fp->_flags |= __SL64;
-#endif
- fp->_close = fmemcloser;
- _newlib_flockfile_end (fp);
- return fp;
-}
-
-#ifndef _REENT_ONLY
-FILE *
-_DEFUN(fmemopen, (buf, size, mode),
- void *buf _AND
- size_t size _AND
- const char *mode)
-{
- return _fmemopen_r (_REENT, buf, size, mode);
-}
-#endif /* !_REENT_ONLY */
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