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[disorder] / lib / inputline.c
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1/*
2 * This file is part of DisOrder.
3 * Copyright (C) 2004, 2007, 2008 Richard Kettlewell
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18/** @file lib/inputline.c
19 * @brief Line input
20 */
21
22#include "common.h"
23
24#include <errno.h>
25
26#include "log.h"
27#include "mem.h"
28#include "vector.h"
29#include "charset.h"
30#include "inputline.h"
31
32/** @brief Read a line from @p fp
33 * @param tag Used in error messages
34 * @param fp Stream to read from
35 * @param lp Where to store newly allocated string
36 * @param newline Newline character or @ref CRLF
37 * @return 0 on success, -1 on error or eof.
38 *
39 * The newline is not included in the string. If the last line of a
40 * stream does not have a newline then that line is still returned.
41 *
42 * If @p newline is @ref CRLF then the line is terminated by CR LF,
43 * not by a single newline character. The CRLF is still not included
44 * in the string in this case.
45 *
46 * @p *lp is only set if the return value was 0.
47 */
48int inputline(const char *tag, FILE *fp, char **lp, int newline) {
49 struct dynstr d;
50 int ch;
51
52 dynstr_init(&d);
53 while((ch = getc(fp)),
54 (!ferror(fp) && !feof(fp) && ch != newline)) {
55 dynstr_append(&d, ch);
56 if(newline == CRLF && d.nvec >= 2
57 && d.vec[d.nvec - 2] == 0x0D && d.vec[d.nvec - 1] == 0x0A) {
58 d.nvec -= 2;
59 break;
60 }
61 }
62 if(ferror(fp)) {
63 disorder_error(errno, "error reading %s", tag);
64 return -1;
65 } else if(feof(fp)) {
66 if(d.nvec != 0)
67 disorder_error(0, "error reading %s: unexpected EOF", tag);
68 return -1;
69 }
70 dynstr_terminate(&d);
71 *lp = d.vec;
72 return 0;
73}
74
75/*
76Local Variables:
77c-basic-offset:2
78comment-column:40
79End:
80*/