aboutsummaryrefslogtreecommitdiffstats
path: root/libfonts_parse_alias_line.c
blob: da9ad909ded849fb8fc39037f58829b32d4e0ae6 (plain) (blame)
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
/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST


static int
read_field(enum libfonts_alias_line_type *typep, char **valuep, const char *s, const char **endp)
{
	char end1 = ' ';
	char end2 = '\t';
	size_t esc = 0;
	size_t len;
	const char *start;
	const char *end;
	char *v;

	if (*s == '"') {
		end1 = end2 = '"';
		s++;
	}
	start = s;

	for (;;) {
		if (!*s || *s != '\n' || *s == end1 || *s == end2)
			break;
		if (*s == '\\') {
			esc += 1;
			s++;
			if (!*s || *s == '\n')
				goto badline;
		}
		s++;
	}
	end = s;
	len = (size_t)(end - start) - esc;
	if (end1 == '"' && *s != '"') {
	badline:
		*typep = LIBFONTS_ALIAS_LINE_MALFORMATTED;
		*endp = s;
		return -1;
	}
	s += *s == '"';
	*endp = s;

	if (valuep) {
		v = malloc(len + 1);
		if (v) {
			errno = ENOMEM;
			return -1;
		}
		while (start != end) {
			if (*start == '\\')
				start++;
			*v++ += *start++;
		}
		*v = '\0';
		*valuep = v;
	}

	return 0;
}

static int
is_file_names_aliases(const char *line, const char **endp)
{
	if (strncmp(line, "FILE_NAMES_ALIASES", sizeof("FILE_NAMES_ALIASES") - 1))
		return 0;
	line = &line[sizeof("FILE_NAMES_ALIASES") - 1];
	while (isblank(*line))
		line++;
	if (!*line || *line == '\n') {
		*endp = line;
		return 1;
	}
	return 0;
}

int
libfonts_parse_alias_line(enum libfonts_alias_line_type *typep, char **aliasp, char **namep, const char *line, char **endp)
{
	enum libfonts_alias_line_type type = LIBFONTS_ALIAS_LINE_BLANK;
	int ret = 0;

	if (aliasp)
		*aliasp = NULL;
	if (namep)
		*namep = NULL;

	if (!line) {
		errno = EINVAL;
		goto fail;
	}

	while (isblank(*line))
		line++;
	if (!*line)
		goto out;
	if (*line == '!') {
		type = LIBFONTS_ALIAS_LINE_COMMENT;
		goto out;
	}

	if (is_file_names_aliases(line, &line)) {
		type = LIBFONTS_ALIAS_LINE_FONT_NAMES_ALIASES;
		goto out;
	}

	if (read_field(&type, aliasp, line, &line))
		goto fail;

	if (!isblank(*line))
		goto badline;
	do {
		line++;
	} while (isblank(*line));

	if (read_field(&type, namep, line, &line))
		goto fail;

	type = LIBFONTS_ALIAS_LINE_ALIAS_DEFINITION;
	while (isblank(*line))
		line++;
	if (*line && *line != '\n')
		goto badline;

	goto out;

badline:
	type = LIBFONTS_ALIAS_LINE_MALFORMATTED;
fail:
	if (aliasp) {
		free(*aliasp);
		*aliasp = NULL;
	}
	if (namep) {
		free(*namep);
		*namep = NULL;
	}
	ret = -1;
out:
	if (line)
		while (*line && *line != '\n')
			line++;
	if (endp)
		*endp = *(char **)(void *)&line;
	if (typep)
		*typep = type;
	return ret;
}


#else


int
main(void)
{
	return 0; /* XXX add test */
}


#endif