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1 | /* | |
2 | * Copyright © 2008 Red Hat, Inc. | |
3 | * | |
4 | * Red Hat Author(s): Behdad Esfahbod | |
5 | * | |
6 | * Permission to use, copy, modify, distribute, and sell this software and its | |
7 | * documentation for any purpose is hereby granted without fee, provided that | |
8 | * the above copyright notice appear in all copies and that both that | |
9 | * copyright notice and this permission notice appear in supporting | |
10 | * documentation, and that the name of Keith Packard not be used in | |
11 | * advertising or publicity pertaining to distribution of the software without | |
12 | * specific, written prior permission. Keith Packard makes no | |
13 | * representations about the suitability of this software for any purpose. It | |
14 | * is provided "as is" without express or implied warranty. | |
15 | * | |
16 | * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
17 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
18 | * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
19 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
20 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
21 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR | |
22 | * PERFORMANCE OF THIS SOFTWARE. | |
23 | */ | |
24 | ||
25 | #include "fcint.h" | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <stdarg.h> | |
29 | ||
30 | ||
31 | static void | |
32 | message (const char *fmt, ...) | |
33 | { | |
34 | va_list args; | |
35 | va_start (args, fmt); | |
36 | fprintf (stderr, "Fontconfig: "); | |
37 | vfprintf (stderr, fmt, args); | |
38 | fprintf (stderr, "\n"); | |
39 | va_end (args); | |
40 | } | |
41 | ||
42 | ||
43 | static FcChar8 *scratch1; | |
44 | static FcChar8 *scratch2; | |
45 | static const FcChar8 *format_orig; | |
46 | ||
47 | static const FcChar8 * | |
48 | interpret_percent (FcPattern *pat, | |
49 | FcStrBuf *buf, | |
50 | const FcChar8 *format) | |
51 | { | |
52 | int width, before; | |
53 | ||
54 | /* parse an optional width specifier */ | |
55 | width = strtol (format, (char **) &format, 10); | |
56 | ||
57 | before = buf->len; | |
58 | ||
59 | switch (*format) { | |
60 | case '{': | |
61 | { | |
62 | FcChar8 *p; | |
63 | FcPatternElt *e; | |
64 | ||
65 | format++; /* skip over '{' */ | |
66 | ||
67 | p = (FcChar8 *) strpbrk ((const char *) format, "}"); | |
68 | if (!p) | |
69 | { | |
70 | message ("Pattern format missing closing brace"); | |
71 | break; | |
72 | } | |
73 | /* extract the element name */ | |
74 | memcpy (scratch1, format, p - format); | |
75 | scratch1[p - format] = '\0'; | |
76 | ||
77 | e = FcPatternObjectFindElt (pat, FcObjectFromName ((const char *) scratch1)); | |
78 | if (e) | |
79 | { | |
80 | FcValueListPtr l; | |
81 | l = FcPatternEltValues(e); | |
82 | FcNameUnparseValueList (buf, l, '\0'); | |
83 | } | |
84 | ||
85 | p++; /* skip over '}' */ | |
86 | format = p; | |
87 | break; | |
88 | } | |
89 | default: | |
90 | message ("Pattern format has invalid character after '%%' at %d", | |
91 | format - format_orig); | |
92 | break; | |
93 | } | |
94 | ||
95 | /* align to width */ | |
96 | if (!buf->failed) | |
97 | { | |
98 | int after, len; | |
99 | ||
100 | after = buf->len; | |
101 | ||
102 | len = after - before; | |
103 | ||
104 | if (len < -width) | |
105 | { | |
106 | /* left align */ | |
107 | while (len++ < -width) | |
108 | FcStrBufChar (buf, ' '); | |
109 | } | |
110 | else if (len < width) | |
111 | { | |
112 | /* right align */ | |
113 | while (len++ < width) | |
114 | FcStrBufChar (buf, ' '); | |
115 | len = after - before; | |
116 | memmove (buf->buf + buf->len - len, | |
117 | buf->buf + buf->len - width, | |
118 | len); | |
119 | memset (buf->buf + buf->len - width, | |
120 | ' ', | |
121 | width - len); | |
122 | } | |
123 | } | |
124 | ||
125 | return format; | |
126 | } | |
127 | ||
128 | static char escaped_char(const char ch) | |
129 | { | |
130 | switch (ch) { | |
131 | case 'a': return '\a'; | |
132 | case 'b': return '\b'; | |
133 | case 'f': return '\f'; | |
134 | case 'n': return '\n'; | |
135 | case 'r': return '\r'; | |
136 | case 't': return '\t'; | |
137 | case 'v': return '\v'; | |
138 | default: return ch; | |
139 | } | |
140 | } | |
141 | ||
142 | static const FcChar8 * | |
143 | interpret (FcPattern *pat, | |
144 | FcStrBuf *buf, | |
145 | const FcChar8 *format, | |
146 | FcChar8 term) | |
147 | { | |
148 | const FcChar8 *end; | |
149 | ||
150 | for (end = format; *end && *end != term;) | |
151 | { | |
152 | switch (*end) | |
153 | { | |
154 | case '\\': | |
155 | end++; /* skip over '\\' */ | |
156 | FcStrBufChar (buf, escaped_char (*end++)); | |
157 | continue; | |
158 | case '%': | |
159 | end++; /* skip over '%' */ | |
160 | if (*end == '%') | |
161 | break; | |
162 | end = interpret_percent (pat, buf, end); | |
163 | continue; | |
164 | } | |
165 | FcStrBufChar (buf, *end); | |
166 | end++; | |
167 | } | |
168 | if (*end != term) | |
169 | message ("Pattern format ended while looking for '%c'", term); | |
170 | ||
171 | return end; | |
172 | } | |
173 | ||
174 | FcChar8 * | |
175 | FcPatternFormat (FcPattern *pat, const FcChar8 *format) | |
176 | { | |
177 | int len; | |
178 | FcStrBuf buf; | |
179 | ||
180 | FcStrBufInit (&buf, 0, 0); | |
181 | len = strlen ((const char *) format); | |
182 | scratch1 = malloc (len); | |
183 | scratch2 = malloc (len); | |
184 | format_orig = format; | |
185 | ||
186 | interpret (pat, &buf, format, '\0'); | |
187 | ||
188 | free (scratch1); | |
189 | free (scratch2); | |
190 | return FcStrBufDone (&buf); | |
191 | } | |
192 | ||
193 | #define __fcformat__ | |
194 | #include "fcaliastail.h" | |
195 | #undef __fcformat__ |