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/* zmapfd - read contents of file descriptor into a newly-allocated buffer */
/* Copyright (C) 2006-2020,2022 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash 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.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <sys/types.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include <errno.h>
#include "bashansi.h"
#include "command.h"
#include "general.h"
#if !defined (errno)
extern int errno;
#endif
#ifndef ZBUFSIZ
# define ZBUFSIZ 4096
#endif
extern ssize_t zread (int, char *, size_t);
/* Dump contents of file descriptor FD to *OSTR. FN is the filename for
error messages (not used right now). */
ssize_t
zmapfd (int fd, char **ostr, const char *fn)
{
ssize_t nr;
char lbuf[ZBUFSIZ];
char *result;
size_t rsize, rind;
result = (char *)xmalloc (rsize = ZBUFSIZ);
rind = 0;
while (1)
{
nr = zread (fd, lbuf, sizeof (lbuf));
if (nr == 0)
break;
else if (nr < 0)
{
free (result);
if (ostr)
*ostr = (char *)NULL;
return -1;
}
RESIZE_MALLOCED_BUFFER (result, rind, nr, rsize, ZBUFSIZ);
memcpy (result+rind, lbuf, nr);
rind += nr;
}
RESIZE_MALLOCED_BUFFER (result, rind, 1, rsize, 128);
result[rind] = '\0';
if (ostr)
*ostr = result;
else
free (result);
return (ssize_t)rind;
}
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