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/* zgetline - read a line of input from a specified file descriptor and return
a pointer to a newly-allocated buffer containing the data. */
/* Copyright (C) 2008,2009 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 "xmalloc.h"
#if !defined (errno)
#include <errno.h>
#endif
extern ssize_t zread __P((int, char *, size_t));
extern ssize_t zreadc __P((int, char *));
extern ssize_t zreadintr __P((int, char *, size_t));
extern ssize_t zreadcintr __P((int, char *));
typedef ssize_t breadfunc_t __P((int, char *, size_t));
typedef ssize_t creadfunc_t __P((int, char *));
/* Initial memory allocation for automatic growing buffer in zreadlinec */
#define GET_LINE_INITIAL_ALLOCATION 16
/* Derived from GNU libc's getline.
The behavior is almost the same as getline. See man getline.
The differences are
(1) using file descriptor instead of FILE *,
(2) the order of arguments; the file descriptor comes the first, and
(3) the addition of third argument, UNBUFFERED_READ; this argument
controls whether get_line uses buffering or not to get a byte data
from FD. get_line uses zreadc if UNBUFFERED_READ is zero; and
uses zread if UNBUFFERED_READ is non-zero.
Returns number of bytes read or -1 on error. */
ssize_t
zgetline (fd, lineptr, n, unbuffered_read)
int fd;
char **lineptr;
size_t *n;
int unbuffered_read;
{
int nr, retval;
char *line, c;
if (lineptr == 0 || n == 0 || (*lineptr == 0 && *n != 0))
return -1;
nr = 0;
line = *lineptr;
while (1)
{
retval = unbuffered_read ? zread (fd, &c, 1) : zreadc(fd, &c);
if (retval <= 0)
{
if (line && nr > 0)
line[nr] = '\0';
break;
}
if (nr + 2 >= *n)
{
size_t new_size;
new_size = (*n == 0) ? GET_LINE_INITIAL_ALLOCATION : *n * 2;
line = (*n >= new_size) ? NULL : xrealloc (*lineptr, new_size);
if (line)
{
*lineptr = line;
*n = new_size;
}
else
{
if (*n > 0)
{
(*lineptr)[*n - 1] = '\0';
nr = *n - 2;
}
break;
}
}
line[nr] = c;
nr++;
if (c == '\n')
{
line[nr] = '\0';
break;
}
}
return nr - 1;
}
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