diff options
Diffstat (limited to 'nuttx/binfmt/libnxflat/libnxflat_read.c')
-rw-r--r-- | nuttx/binfmt/libnxflat/libnxflat_read.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/nuttx/binfmt/libnxflat/libnxflat_read.c b/nuttx/binfmt/libnxflat/libnxflat_read.c new file mode 100644 index 000000000..ff5200140 --- /dev/null +++ b/nuttx/binfmt/libnxflat/libnxflat_read.c @@ -0,0 +1,123 @@ +/**************************************************************************** + * binfmt/libnxflat/libnxflat_read.c + * + * Copyright (C) 2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 NuttX 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 COPYRIGHT HOLDERS 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 + * COPYRIGHT OWNER 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#include <sys/types.h> + +#include <unistd.h> +#include <string.h> +#include <nxflat.h> +#include <debug.h> +#include <errno.h> + +#include <arpa/inet.h> +#include <nuttx/nxflat.h> + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Constant Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: nxflat_read + ****************************************************************************/ + +int nxflat_read(struct nxflat_loadinfo_s *loadinfo, char *buffer, int readsize, int offset) +{ + ssize_t nbytes; /* Number of bytes read */ + off_t rpos; /* Position returned by lseek */ + char *bufptr; /* Next buffer location to read into */ + int bytesleft; /* Number of bytes of .data left to read */ + int bytesread; /* Total number of bytes read */ + + /* Seek to the position in the object file where the initialized + * data is saved. + */ + + bytesread = 0; + bufptr = buffer; + bytesleft = readsize; + do + { + rpos = lseek(loadinfo->filfd, offset, SEEK_SET); + if (rpos != offset) + { + bdbg("Failed to seek to position %d: %d\n", offset, errno); + return -errno; + } + + /* Read the file data at offset into the user buffer */ + + nbytes = read(loadinfo->filfd, bufptr, bytesleft); + if (nbytes < 0) + { + if (errno != EINTR) + { + bdbg("Read of .data failed: %d\n", errno); + return -errno; + } + } + else if (nbytes == 0) + { + bdbg("Unexpected end of file\n"); + return -ENODATA; + } + else + { + bytesread += nbytes; + bytesleft -= nbytes; + bufptr += nbytes; + offset += nbytes; + } + } + while (bytesread < readsize); + return OK; +} + |