1 /* zgetline - read a line of input from a specified file descriptor and return
2 a pointer to a newly-allocated buffer containing the data. */
4 /* Copyright (C) 2008,2009 Free Software Foundation, Inc.
6 This file is part of GNU Bash, the Bourne Again SHell.
8 Bash is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 Bash is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with Bash. If not, see <http://www.gnu.org/licenses/>.
24 #include <sys/types.h>
26 #if defined (HAVE_UNISTD_H)
37 extern ssize_t zread __P((int, char *, size_t));
38 extern ssize_t zreadc __P((int, char *));
40 /* Initial memory allocation for automatic growing buffer in zreadlinec */
41 #define GET_LINE_INITIAL_ALLOCATION 16
43 /* Derived from GNU libc's getline.
44 The behavior is almost the same as getline. See man getline.
46 (1) using file descriptor instead of FILE *,
47 (2) the order of arguments; the file descriptor comes the first, and
48 (3) the addtion of thired argument, UNBUFFERED_READ; this argument
49 controls whether get_line uses buffering or not to get a byte data
50 from FD. get_line uses zreadc if UNBUFFERED_READ is zero; and
51 uses zread if UNBUFFERED_READ is non-zero.
53 Returns number of bytes read or -1 on error. */
56 zgetline (fd, lineptr, n, unbuffered_read)
65 if (lineptr == 0 || n == 0 || (*lineptr == 0 && *n != 0))
73 retval = unbuffered_read ? zread (fd, &c, 1) : zreadc(fd, &c);
85 new_size = (*n == 0) ? GET_LINE_INITIAL_ALLOCATION : *n * 2;
86 line = xrealloc (*lineptr, new_size);
97 (*lineptr)[*n - 1] = '\0';