1 /* vifm
2 * Copyright (C) 2001 Ken Steen.
3 * Copyright (C) 2011 xaizek.
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 2 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, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
18 */
19
20 #include "file_streams.h"
21
22 #include <stddef.h> /* NULL size_t ssize_t */
23 #include <stdio.h> /* FILE */
24 #include <stdlib.h> /* free() realloc() */
25 #include <string.h> /* strlen() */
26
27 static int get_char(FILE *fp);
28
29 char *
read_line(FILE * fp,char buf[])30 read_line(FILE *fp, char buf[])
31 {
32 enum { PART_BUFFER_LEN = 512 };
33 char part_buf[PART_BUFFER_LEN];
34 char *last_allocated_block = NULL;
35 size_t len = 0;
36
37 while(get_line(fp, part_buf, sizeof(part_buf)) != NULL)
38 {
39 size_t part_len = strlen(part_buf);
40 const int eol = (part_len > 0) && (part_buf[part_len - 1] == '\n');
41 const size_t new_len = len + (part_len - eol);
42
43 last_allocated_block = realloc(buf, new_len + 1);
44 if(last_allocated_block == NULL)
45 {
46 break;
47 }
48
49 if(eol)
50 {
51 part_buf[--part_len] = '\0';
52 }
53
54 buf = last_allocated_block;
55 strcpy(buf + len, part_buf);
56
57 if(eol)
58 {
59 break;
60 }
61
62 len = new_len;
63 }
64
65 if(last_allocated_block == NULL)
66 {
67 free(buf);
68 buf = NULL;
69 }
70
71 return buf;
72 }
73
74 char *
get_line(FILE * fp,char buf[],size_t bufsz)75 get_line(FILE *fp, char buf[], size_t bufsz)
76 {
77 int c = '\0';
78 char *start = buf;
79
80 if(bufsz <= 1)
81 {
82 return NULL;
83 }
84
85 while(bufsz > 1 && (c = get_char(fp)) != EOF)
86 {
87 *buf++ = c;
88 bufsz--;
89 if(c == '\n')
90 {
91 break;
92 }
93 }
94 *buf = '\0';
95
96 return (c == EOF && buf == start) ? NULL : start;
97 }
98
99 /* Returns next character from file stream. */
100 static int
get_char(FILE * fp)101 get_char(FILE *fp)
102 {
103 int c = fgetc(fp);
104 if(c == '\r')
105 {
106 int c2 = fgetc(fp);
107 if(c2 != '\n')
108 ungetc(c2, fp);
109 c = '\n';
110 }
111 return c;
112 }
113
114 void
skip_bom(FILE * fp)115 skip_bom(FILE *fp)
116 {
117 int c;
118
119 c = fgetc(fp);
120 if(c != 0xef)
121 {
122 ungetc(c, fp);
123 return;
124 }
125
126 c = fgetc(fp);
127 if(c != 0xbb)
128 {
129 ungetc(c, fp);
130 return;
131 }
132
133 c = fgetc(fp);
134 if(c != 0xbf)
135 {
136 ungetc(c, fp);
137 }
138 }
139
140 /* vim: set tabstop=2 softtabstop=2 shiftwidth=2 noexpandtab cinoptions-=(0 : */
141 /* vim: set cinoptions+=t0 filetype=c : */
142