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git.ipfire.org Git - people/ms/u-boot.git/blob - tools/getline.c
1 /* getline.c -- Replacement for GNU C library function getline
3 Copyright (C) 1993, 1996, 2001, 2002 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19 /* Written by Jan Brittenson, bson@gnu.ai.mit.edu. */
24 /* Always add at least this many bytes when extending the buffer. */
27 /* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR
28 + OFFSET (and null-terminate it). *LINEPTR is a pointer returned from
29 malloc (or NULL), pointing to *N characters of space. It is realloc'd
30 as necessary. Return the number of characters read (not including the
31 null terminator), or -1 on error or EOF.
32 NOTE: There is another getstr() function declared in <curses.h>. */
33 static int getstr(char **lineptr
, size_t *n
, FILE *stream
,
34 char terminator
, size_t offset
)
36 int nchars_avail
; /* Allocated but unused chars in *LINEPTR. */
37 char *read_pos
; /* Where we're reading into *LINEPTR. */
40 if (!lineptr
|| !n
|| !stream
)
45 *lineptr
= malloc(*n
);
50 nchars_avail
= *n
- offset
;
51 read_pos
= *lineptr
+ offset
;
54 register int c
= getc(stream
);
56 /* We always want at least one char left in the buffer, since we
57 always (unless we get an error while reading the first char)
58 NUL-terminate the line buffer. */
60 assert(*n
- nchars_avail
== read_pos
- *lineptr
);
61 if (nchars_avail
< 2) {
67 nchars_avail
= *n
+ *lineptr
- read_pos
;
68 *lineptr
= realloc(*lineptr
, *n
);
71 read_pos
= *n
- nchars_avail
+ *lineptr
;
72 assert(*n
- nchars_avail
== read_pos
- *lineptr
);
75 if (c
== EOF
|| ferror (stream
)) {
76 /* Return partial line, if any. */
77 if (read_pos
== *lineptr
)
87 /* Return the line. */
91 /* Done - NUL terminate and return the number of chars read. */
94 ret
= read_pos
- (*lineptr
+ offset
);
98 int getline (char **lineptr
, size_t *n
, FILE *stream
)
100 return getstr(lineptr
, n
, stream
, '\n', 0);