1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/**
* mds — A micro-display server
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mds-kbdc.h"
#include <libmdsserver/macros.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
/**
* The number of elements in `argv`
*/
static int argc;
/**
* The command line arguments
*/
static char** argv;
/**
* Read the content of a file, ignoring interruptions
*
* @param pathname The file to read
* @param size Output parameter for the size of the read content, in char:s
* @return The read content, `NULL` on error
*/
static char* read_file(const char* restrict pathname, size_t* restrict size)
{
size_t buf_size = 8096;
size_t buf_ptr = 0;
char* restrict content = NULL;
char* restrict old = NULL;
int fd = -1;
ssize_t got;
/* Allocate buffer for the file's content. */
fail_if (xmalloc(content, buf_size, char));
/* Open the file to compile. */
fail_if ((fd = open(pathname, O_RDONLY)) < 0);
/* Read the file to compile. */
for (;;)
{
/* Make sure the buffer is not small. */
if (buf_size - buf_ptr < 2048)
{
old = content;
fail_if (xrealloc(content, buf_size <<= 1, char));
old = NULL;
}
/* Read a chunk of the file. */
got = read(fd, content + buf_ptr, (buf_size - buf_ptr) * sizeof(char));
if ((got < 0) && (errno == EINTR)) continue;
else if (got < 0) goto pfail;
else if (got == 0) break;
buf_ptr += (size_t)got;
}
/* Shrink the buffer so it is not excessively large. */
fail_if (xrealloc(content, buf_ptr, char));
/* Close file decriptor for the file. */
close(fd);
*size = buf_ptr;
return content;
pfail:
xperror(*argv);
free(old);
free(content);
if (fd >= 0)
close(fd);
return NULL;
}
/**
* Remove non-functional code (comments and empty lines) from the content
*
* @param content The code to shrink
* @param size The size of `content`, in char:s
* @return The new size of `content`, in char:s; this function cannot fail
*/
static size_t shrink_file(char* restrict content, size_t size)
{
#define t content[n_ptr++] = c
#define last content[n_ptr - 1]
size_t n_ptr = 0, o_ptr = 0;
int comment = 0, quote = 0, escape = 0;
while (o_ptr < size)
{
char c = content[o_ptr++];
if (comment)
{
if (c == '\n') comment = 0;
}
else if (escape) t, escape = 0;
else if (quote)
{
t;
if (c == '\\') escape = 1;
else if (c == '"') quote = 0;
}
else if (c == '#') comment = 1;
else if (c == '"') t, quote = 1;
else if (!strchr("\n ", c) || !n_ptr || (last != c))
{
/* Store data, but remove unnecessary new lines and unnecessary spaces. */
if ((c == '\n') && n_ptr && (last == ' ')) n_ptr--;
if ((c == ' ') && n_ptr && (last == '\n')) continue;
t;
}
}
return n_ptr;
#undef last
#undef t
}
/**
* Compile a keyboard layout file
*
* @param argc_ The number of elements in `argv_`
* @param argv_ The command line arguments
* @return Zero on and only one success
*/
int main(int argc_, char** argv_)
{
const char* pathname = argv_[1];
char* restrict content = NULL;
size_t content_size;
argc = argc_;
argv = argv_;
/* Read the file. */
content = read_file(pathname, &content_size);
fail_if (content == NULL);
/* Remove comments and empty lines. */
content_size = shrink_file(content, content_size);
fail_if (xrealloc(content, content_size, char));
return 0;
pfail:
xperror(*argv);
return 1;
}
|
