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/* Utility target functions for GDB, and GDBserver.
Copyright (C) 2015 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "common-defs.h"
#include "target/target-utils.h"
LONGEST
read_alloc (gdb_byte **buf_p, int handle, read_alloc_pread_ftype *pread_func,
int padding)
{
size_t buf_alloc, buf_pos;
gdb_byte *buf;
LONGEST n;
int target_errno;
/* Start by reading up to 4K at a time. The target will throttle
this number down if necessary. */
buf_alloc = 4096;
buf = xmalloc (buf_alloc);
buf_pos = 0;
while (1)
{
n = pread_func (handle, &buf[buf_pos], buf_alloc - buf_pos - padding,
buf_pos, &target_errno);
if (n <= 0)
{
if (n < 0 || (n == 0 && buf_pos == 0))
xfree (buf);
else
*buf_p = buf;
if (n < 0)
{
/* An error occurred. */
return -1;
}
else
{
/* Read all there was. */
return buf_pos;
}
}
buf_pos += n;
/* If the buffer is filling up, expand it. */
if (buf_alloc < buf_pos * 2)
{
buf_alloc *= 2;
buf = xrealloc (buf, buf_alloc);
}
}
}
char *
read_stralloc (struct inferior *inf, const char *filename,
read_stralloc_func_ftype *func)
{
gdb_byte *buffer;
char *bufstr;
LONGEST i, transferred;
transferred = func (inf, filename, &buffer, 1);
bufstr = (char *) buffer;
if (transferred < 0)
return NULL;
if (transferred == 0)
return xstrdup ("");
bufstr[transferred] = 0;
/* Check for embedded NUL bytes; but allow trailing NULs. */
for (i = strlen (bufstr); i < transferred; i++)
if (bufstr[i] != 0)
{
warning (_("target file %s "
"contained unexpected null characters"),
filename);
break;
}
return bufstr;
}
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