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996
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1 /* -*- mode: C; coding: utf-8; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*-
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2 *
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3 * cfunge - A standard-conforming Befunge93/98/109 interpreter in C.
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4 * Copyright (C) 2008-2009 Arvid Norlander <anmaster AT tele2 DOT se>
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5 *
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6 * This program is free software: you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation, either version 3 of the License, or
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9 * (at the proxy's option) any later version. Arvid Norlander is a
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10 * proxy who can decide which future versions of the GNU General Public
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11 * License can be used.
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12 *
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13 * This program is distributed in the hope that it will be useful,
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14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 * GNU General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU General Public License
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19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include "global.h"
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23 #include "support.h"
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24
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25 #include <stdio.h>
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26 #include <limits.h>
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27 #include <stdlib.h>
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28 #include <errno.h>
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29
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30 #ifndef SIZE_MAX
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31 # define SIZE_MAX ((size_t) -1)
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32 #endif
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33 #ifndef SSIZE_MAX
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34 # define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
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35 #endif
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36
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37 // This function is from Gnulib
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38 FUNGE_ATTR_FAST FUNGE_ATTR_WARN_UNUSED
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39 static inline ssize_t
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40 cf_getdelim(char **lineptr, size_t *n, int delimiter, FILE *fp)
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41 {
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42 ssize_t result;
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43 size_t cur_len = 0;
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44
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45 if (lineptr == NULL || n == NULL || fp == NULL) {
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46 errno = EINVAL;
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47 return -1;
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48 }
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49
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50 cf_flockfile(fp);
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51
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52 if (*lineptr == NULL || *n == 0) {
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53 *n = 120;
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54 *lineptr = (char *) cf_realloc(*lineptr, *n);
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55 if (*lineptr == NULL) {
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56 result = -1;
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57 goto unlock_return;
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58 }
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59 }
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60
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61 for (;;) {
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62 int i;
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63
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64 i = cf_getc_unlocked(fp);
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65 if (i == EOF) {
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66 result = -1;
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67 break;
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68 }
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69
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70 /* Make enough space for len+1 (for final NUL) bytes. */
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71 if (cur_len + 1 >= *n) {
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72 size_t needed_max =
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73 SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX;
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74 size_t needed = 2 * *n + 1; /* Be generous. */
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75 char *new_lineptr;
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76
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77 if (needed_max < needed)
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78 needed = needed_max;
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79 if (cur_len + 1 >= needed) {
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80 result = -1;
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81 // This ifdef is for Windows only really. Most OS defines EOVERFLOW.
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82 #ifdef EOVERFLOW
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83 errno = EOVERFLOW;
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84 #endif
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85 goto unlock_return;
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86 }
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87
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88 new_lineptr = (char *) cf_realloc(*lineptr, needed);
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89 if (new_lineptr == NULL) {
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90 result = -1;
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91 goto unlock_return;
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92 }
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93
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94 *lineptr = new_lineptr;
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95 *n = needed;
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96 }
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97
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98 (*lineptr)[cur_len] = (char)i;
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99 cur_len++;
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100
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101 if (i == delimiter)
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102 break;
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103 }
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104 (*lineptr)[cur_len] = '\0';
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105 result = cur_len ? (ssize_t)cur_len : result;
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106
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107 unlock_return:
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108 cf_funlockfile(fp); // doesn't set errno
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109
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110 return result;
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111 }
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112
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113 // This function is from Gnulib
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114 FUNGE_ATTR_FAST ssize_t
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115 cf_getline(char **lineptr, size_t *n, FILE *stream)
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116 {
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117 return cf_getdelim(lineptr, n, '\n', stream);
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118 }
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