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comparison interps/cfunge/cfunge-src/src/support.c @ 996:859f9b4339e6

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author HackBot
date Sun, 09 Dec 2012 19:30:08 +0000
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995:6883f5911eb7 996:859f9b4339e6
1 /* -*- mode: C; coding: utf-8; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*-
2 *
3 * cfunge - A standard-conforming Befunge93/98/109 interpreter in C.
4 * Copyright (C) 2008-2009 Arvid Norlander <anmaster AT tele2 DOT se>
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at the proxy's option) any later version. Arvid Norlander is a
10 * proxy who can decide which future versions of the GNU General Public
11 * License can be used.
12 *
13 * This program 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.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "global.h"
23 #include "support.h"
24
25 #include <stdio.h>
26 #include <limits.h>
27 #include <stdlib.h>
28 #include <errno.h>
29
30 #ifndef SIZE_MAX
31 # define SIZE_MAX ((size_t) -1)
32 #endif
33 #ifndef SSIZE_MAX
34 # define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
35 #endif
36
37 // This function is from Gnulib
38 FUNGE_ATTR_FAST FUNGE_ATTR_WARN_UNUSED
39 static inline ssize_t
40 cf_getdelim(char **lineptr, size_t *n, int delimiter, FILE *fp)
41 {
42 ssize_t result;
43 size_t cur_len = 0;
44
45 if (lineptr == NULL || n == NULL || fp == NULL) {
46 errno = EINVAL;
47 return -1;
48 }
49
50 cf_flockfile(fp);
51
52 if (*lineptr == NULL || *n == 0) {
53 *n = 120;
54 *lineptr = (char *) cf_realloc(*lineptr, *n);
55 if (*lineptr == NULL) {
56 result = -1;
57 goto unlock_return;
58 }
59 }
60
61 for (;;) {
62 int i;
63
64 i = cf_getc_unlocked(fp);
65 if (i == EOF) {
66 result = -1;
67 break;
68 }
69
70 /* Make enough space for len+1 (for final NUL) bytes. */
71 if (cur_len + 1 >= *n) {
72 size_t needed_max =
73 SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX;
74 size_t needed = 2 * *n + 1; /* Be generous. */
75 char *new_lineptr;
76
77 if (needed_max < needed)
78 needed = needed_max;
79 if (cur_len + 1 >= needed) {
80 result = -1;
81 // This ifdef is for Windows only really. Most OS defines EOVERFLOW.
82 #ifdef EOVERFLOW
83 errno = EOVERFLOW;
84 #endif
85 goto unlock_return;
86 }
87
88 new_lineptr = (char *) cf_realloc(*lineptr, needed);
89 if (new_lineptr == NULL) {
90 result = -1;
91 goto unlock_return;
92 }
93
94 *lineptr = new_lineptr;
95 *n = needed;
96 }
97
98 (*lineptr)[cur_len] = (char)i;
99 cur_len++;
100
101 if (i == delimiter)
102 break;
103 }
104 (*lineptr)[cur_len] = '\0';
105 result = cur_len ? (ssize_t)cur_len : result;
106
107 unlock_return:
108 cf_funlockfile(fp); // doesn't set errno
109
110 return result;
111 }
112
113 // This function is from Gnulib
114 FUNGE_ATTR_FAST ssize_t
115 cf_getline(char **lineptr, size_t *n, FILE *stream)
116 {
117 return cf_getdelim(lineptr, n, '\n', stream);
118 }