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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MPLAYER_BSTR_H
#define MPLAYER_BSTR_H
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <stdbool.h>
#include <stdarg.h>
#include "mpv_talloc.h"
#include "osdep/compiler.h"
/* NOTE: 'len' is size_t, but most string-handling functions below assume
* that input size has been sanity checked and len fits in an int.
*/
typedef struct bstr {
unsigned char *start;
size_t len;
} bstr;
// If str.start is NULL, return NULL.
static inline char *bstrdup0(void *talloc_ctx, struct bstr str)
{
return talloc_strndup(talloc_ctx, (char *)str.start, str.len);
}
// Like bstrdup0(), but always return a valid C-string.
static inline char *bstrto0(void *talloc_ctx, struct bstr str)
{
return str.start ? bstrdup0(talloc_ctx, str) : talloc_strdup(talloc_ctx, "");
}
// Return start = NULL iff that is true for the original.
static inline struct bstr bstrdup(void *talloc_ctx, struct bstr str)
{
struct bstr r = { NULL, str.len };
if (str.start)
r.start = (unsigned char *)talloc_memdup(talloc_ctx, str.start, str.len);
return r;
}
static inline struct bstr bstr0(const char *s)
{
return (struct bstr){(unsigned char *)s, s ? strlen(s) : 0};
}
int bstrcmp(struct bstr str1, struct bstr str2);
int bstrcasecmp(struct bstr str1, struct bstr str2);
int bstrchr(struct bstr str, int c);
int bstrrchr(struct bstr str, int c);
int bstrspn(struct bstr str, const char *accept);
int bstrcspn(struct bstr str, const char *reject);
int bstr_find(struct bstr haystack, struct bstr needle);
struct bstr *bstr_splitlines(void *talloc_ctx, struct bstr str);
struct bstr bstr_lstrip(struct bstr str);
struct bstr bstr_strip(struct bstr str);
struct bstr bstr_split(struct bstr str, const char *sep, struct bstr *rest);
bool bstr_split_tok(bstr str, const char *tok, bstr *out_left, bstr *out_right);
struct bstr bstr_splice(struct bstr str, int start, int end);
long long bstrtoll(struct bstr str, struct bstr *rest, int base);
double bstrtod(struct bstr str, struct bstr *rest);
void bstr_lower(struct bstr str);
int bstr_sscanf(struct bstr str, const char *format, ...);
// Decode a string containing hexadecimal data. All whitespace will be silently
// ignored. When successful, this allocates a new array to store the output.
bool bstr_decode_hex(void *talloc_ctx, struct bstr hex, struct bstr *out);
// Decode the UTF-8 code point at the start of the string, and return the
// character.
// After calling this function, *out_next will point to the next character.
// out_next can be NULL.
// On error, -1 is returned, and *out_next is not modified.
int bstr_decode_utf8(struct bstr str, struct bstr *out_next);
// Return the UTF-8 code point at the start of the string.
// After calling this function, *out_next will point to the next character.
// out_next can be NULL.
// On error, an empty string is returned, and *out_next is not modified.
struct bstr bstr_split_utf8(struct bstr str, struct bstr *out_next);
// Return the length of the UTF-8 sequence that starts with the given byte.
// Given a string char *s, the next UTF-8 code point is to be expected at
// s + bstr_parse_utf8_code_length(s[0])
// On error, -1 is returned. On success, it returns a value in the range [1, 4].
int bstr_parse_utf8_code_length(unsigned char b);
// Return >= 0 if the string is valid UTF-8, otherwise negative error code.
// Embedded \0 bytes are considered valid.
// This returns -N if the UTF-8 string was likely just cut-off in the middle of
// an UTF-8 sequence: -1 means 1 byte was missing, -5 5 bytes missing.
// If the string was likely not cut off, -8 is returned.
// Use (return_value > -8) to check whether the string is valid UTF-8 or valid
// but cut-off UTF-8.
int bstr_validate_utf8(struct bstr s);
// Force the input string to valid UTF-8. If invalid UTF-8 encoding is
// encountered, the invalid bytes are interpreted as Latin-1.
// Embedded \0 bytes are considered valid.
// If replacement happens, a newly allocated string is returned (with a \0
// byte added past its end for convenience). The string is allocated via
// talloc, with talloc_ctx as parent.
struct bstr bstr_sanitize_utf8_latin1(void *talloc_ctx, struct bstr s);
// Return the text before the occurrence of a character, and return it. Change
// *rest to point to the text following this character. (rest can be NULL.)
struct bstr bstr_splitchar(struct bstr str, struct bstr *rest, const char c);
// Like bstr_splitchar. Trailing newlines are not stripped.
static inline struct bstr bstr_getline(struct bstr str, struct bstr *rest)
{
return bstr_splitchar(str, rest, '\n');
}
// Strip one trailing line break. This is intended for use with bstr_getline,
// and will remove the trailing \n or \r\n sequence.
struct bstr bstr_strip_linebreaks(struct bstr str);
void bstr_xappend(void *talloc_ctx, bstr *s, bstr append);
void bstr_xappend_asprintf(void *talloc_ctx, bstr *s, const char *fmt, ...)
PRINTF_ATTRIBUTE(3, 4);
void bstr_xappend_vasprintf(void *talloc_ctx, bstr *s, const char *fmt, va_list va)
PRINTF_ATTRIBUTE(3, 0);
// If s starts/ends with prefix, return true and return the rest of the string
// in s.
bool bstr_eatstart(struct bstr *s, struct bstr prefix);
bool bstr_eatend(struct bstr *s, struct bstr prefix);
bool bstr_case_startswith(struct bstr s, struct bstr prefix);
bool bstr_case_endswith(struct bstr s, struct bstr suffix);
struct bstr bstr_strip_ext(struct bstr str);
struct bstr bstr_get_ext(struct bstr s);
static inline struct bstr bstr_cut(struct bstr str, int n)
{
if (n < 0) {
n += str.len;
if (n < 0)
n = 0;
}
if (((size_t)n) > str.len)
n = str.len;
return (struct bstr){str.start + n, str.len - n};
}
static inline bool bstr_startswith(struct bstr str, struct bstr prefix)
{
if (str.len < prefix.len)
return false;
return !memcmp(str.start, prefix.start, prefix.len);
}
static inline bool bstr_startswith0(struct bstr str, const char *prefix)
{
return bstr_startswith(str, bstr0(prefix));
}
static inline bool bstr_endswith(struct bstr str, struct bstr suffix)
{
if (str.len < suffix.len)
return false;
return !memcmp(str.start + str.len - suffix.len, suffix.start, suffix.len);
}
static inline bool bstr_endswith0(struct bstr str, const char *suffix)
{
return bstr_endswith(str, bstr0(suffix));
}
static inline int bstrcmp0(struct bstr str1, const char *str2)
{
return bstrcmp(str1, bstr0(str2));
}
static inline bool bstr_equals(struct bstr str1, struct bstr str2)
{
if (str1.len != str2.len)
return false;
return str1.start == str2.start || bstrcmp(str1, str2) == 0;
}
static inline bool bstr_equals0(struct bstr str1, const char *str2)
{
return bstr_equals(str1, bstr0(str2));
}
static inline int bstrcasecmp0(struct bstr str1, const char *str2)
{
return bstrcasecmp(str1, bstr0(str2));
}
static inline int bstr_find0(struct bstr haystack, const char *needle)
{
return bstr_find(haystack, bstr0(needle));
}
static inline bool bstr_eatstart0(struct bstr *s, const char *prefix)
{
return bstr_eatstart(s, bstr0(prefix));
}
static inline bool bstr_eatend0(struct bstr *s, const char *prefix)
{
return bstr_eatend(s, bstr0(prefix));
}
// create a pair (not single value!) for "%.*s" printf syntax
#define BSTR_P(bstr) (int)((bstr).len), ((bstr).start ? (char*)(bstr).start : "")
#define WHITESPACE " \f\n\r\t\v"
#endif /* MPLAYER_BSTR_H */
|