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 "config.h"
25
26 #include "utils.h"
27
28 #ifdef HAVE_MMAP
29
30 #include <fcntl.h>
31 #include <unistd.h>
32 #include <sys/mman.h>
33 #include <sys/stat.h>
34 #include <sys/types.h>
35
36 bool
map_file(FILE * file,char ** string_out,size_t * size_out)37 map_file(FILE *file, char **string_out, size_t *size_out)
38 {
39 struct stat stat_buf;
40 int fd;
41 char *string;
42
43 /* Make sure to keep the errno on failure! */
44 fd = fileno(file);
45 if (fd < 0)
46 return false;
47
48 if (fstat(fd, &stat_buf) != 0)
49 return false;
50
51 string = mmap(NULL, stat_buf.st_size, PROT_READ, MAP_SHARED, fd, 0);
52 if (string == MAP_FAILED)
53 return false;
54
55 *string_out = string;
56 *size_out = stat_buf.st_size;
57 return true;
58 }
59
60 void
unmap_file(char * str,size_t size)61 unmap_file(char *str, size_t size)
62 {
63 munmap(str, size);
64 }
65
66 #else
67
68 bool
map_file(FILE * file,char ** string_out,size_t * size_out)69 map_file(FILE *file, char **string_out, size_t *size_out)
70 {
71 long ret;
72 size_t ret_s;
73 char *string;
74 size_t size;
75
76 /* Make sure to keep the errno on failure! */
77
78 ret = fseek(file, 0, SEEK_END);
79 if (ret != 0)
80 return false;
81
82 ret = ftell(file);
83 if (ret < 0)
84 return false;
85 size = (size_t) ret;
86
87 ret = fseek(file, 0, SEEK_SET);
88 if (ret < 0)
89 return false;
90
91 string = malloc(size);
92 if (!string)
93 return false;
94
95 ret_s = fread(string, 1, size, file);
96 if (ret_s < size) {
97 free(string);
98 return false;
99 }
100
101 *string_out = string;
102 *size_out = size;
103 return true;
104 }
105
106 void
unmap_file(char * str,size_t size)107 unmap_file(char *str, size_t size)
108 {
109 free(str);
110 }
111
112 #endif
113
114 // ASCII lower-case map.
115 static const unsigned char lower_map[] = {
116 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
117 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
118 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58,
119 59, 60, 61, 62, 63, 64, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
120 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122,
121 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
122 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122,
123 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137,
124 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152,
125 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167,
126 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182,
127 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197,
128 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212,
129 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227,
130 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242,
131 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
132 };
133
134 // ASCII tolower (to avoid locale issues).
135 char
to_lower(char c)136 to_lower(char c)
137 {
138 return (char) lower_map[(unsigned char) c];
139 }
140
141 // ASCII strcasecmp (to avoid locale issues).
142 int
istrcmp(const char * a,const char * b)143 istrcmp(const char *a, const char *b)
144 {
145 for (size_t i = 0; ; i++) {
146 if (to_lower(a[i]) != to_lower(b[i]))
147 return (int) to_lower(a[i]) - (int) to_lower(b[i]);
148 if (!a[i])
149 break;
150 }
151 return 0;
152 }
153
154 // ASCII strncasecmp (to avoid locale issues).
155 int
istrncmp(const char * a,const char * b,size_t n)156 istrncmp(const char *a, const char *b, size_t n)
157 {
158 for (size_t i = 0; i < n; i++) {
159 if (to_lower(a[i]) != to_lower(b[i]))
160 return (int) to_lower(a[i]) - (int) to_lower(b[i]);
161 if (!a[i])
162 break;
163 }
164 return 0;
165 }
166
167 #if !(defined(HAVE_ASPRINTF) && HAVE_ASPRINTF)
168 int
asprintf(char ** strp,const char * fmt,...)169 asprintf(char **strp, const char *fmt, ...)
170 {
171 int ret;
172 va_list ap;
173 va_start(ap, fmt);
174 ret = vasprintf(strp, fmt, ap);
175 va_end(ap);
176 return ret;
177 }
178
179 # if !(defined(HAVE_VASPRINTF) && HAVE_VASPRINTF)
180 int
vasprintf(char ** strp,const char * fmt,va_list ap)181 vasprintf(char **strp, const char *fmt, va_list ap)
182 {
183 int ret;
184 char *buf;
185 va_list ap_copy;
186
187 /*
188 * The value of the va_list parameter is undefined after the call to
189 * vsnprintf() returns: pass a copy to make sure "ap" remains valid.
190 */
191 va_copy(ap_copy, ap);
192 ret = vsnprintf(NULL, 0, fmt, ap_copy);
193 va_end(ap_copy);
194
195 if (ret < 0)
196 return ret;
197
198 if (!(buf = malloc(ret + 1)))
199 return -1;
200
201 if ((ret = vsnprintf(buf, ret + 1, fmt, ap)) < 0) {
202 free(buf);
203 return ret;
204 }
205
206 *strp = buf;
207 return ret;
208 }
209 # endif /* !HAVE_VASPRINTF */
210 #endif /* !HAVE_ASPRINTF */
211