1 /*
2 * Copyright © 2013 Ran Benita <ran234@gmail.com>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24 #include "utils.h"
25
26 #ifdef HAVE_MMAP
27
28 #include <fcntl.h>
29 #include <unistd.h>
30 #include <sys/mman.h>
31 #include <sys/stat.h>
32 #include <sys/types.h>
33
34 bool
map_file(FILE * file,const char ** string_out,size_t * size_out)35 map_file(FILE *file, const char **string_out, size_t *size_out)
36 {
37 struct stat stat_buf;
38 const int fd = fileno(file);
39 char *string;
40
41 /* Make sure to keep the errno on failure! */
42
43 if (fstat(fd, &stat_buf) != 0)
44 return false;
45
46 string = mmap(NULL, stat_buf.st_size, PROT_READ, MAP_SHARED, fd, 0);
47 if (string == MAP_FAILED)
48 return false;
49
50 *string_out = string;
51 *size_out = stat_buf.st_size;
52 return true;
53 }
54
55 void
unmap_file(const char * str,size_t size)56 unmap_file(const char *str, size_t size)
57 {
58 munmap(UNCONSTIFY(str), size);
59 }
60
61 #else
62
63 bool
map_file(FILE * file,const char ** string_out,size_t * size_out)64 map_file(FILE *file, const char **string_out, size_t *size_out)
65 {
66 long ret;
67 size_t ret_s;
68 char *string;
69 size_t size;
70
71 /* Make sure to keep the errno on failure! */
72
73 ret = fseek(file, 0, SEEK_END);
74 if (ret != 0)
75 return false;
76
77 ret = ftell(file);
78 if (ret < 0)
79 return false;
80 size = (size_t) ret;
81
82 ret = fseek(file, 0, SEEK_SET);
83 if (ret < 0)
84 return false;
85
86 string = malloc(size);
87 if (!string)
88 return false;
89
90 ret_s = fread(string, 1, size, file);
91 if (ret_s < size) {
92 free(string);
93 return false;
94 }
95
96 *string_out = string;
97 *size_out = size;
98 return true;
99 }
100
101 void
unmap_file(const char * str,size_t size)102 unmap_file(const char *str, size_t size)
103 {
104 free(UNCONSTIFY(str));
105 }
106
107 #endif
108