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git.proxmox.com Git - ovs.git/blob - lib/dynamic-string.c
2 * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #include "dynamic-string.h"
26 /* Initializes 'ds' as an empty string buffer. */
28 ds_init(struct ds
*ds
)
35 /* Sets 'ds''s length to 0, effectively clearing any existing content. Does
36 * not free any memory. */
38 ds_clear(struct ds
*ds
)
43 /* Reduces 'ds''s length to no more than 'new_length'. (If its length is
44 * already 'new_length' or less, does nothing.) */
46 ds_truncate(struct ds
*ds
, size_t new_length
)
48 if (ds
->length
> new_length
) {
49 ds
->length
= new_length
;
50 ds
->string
[new_length
] = '\0';
54 /* Ensures that at least 'min_length + 1' bytes (including space for a null
55 * terminator) are allocated for ds->string, allocating or reallocating memory
58 ds_reserve(struct ds
*ds
, size_t min_length
)
60 if (min_length
> ds
->allocated
|| !ds
->string
) {
61 ds
->allocated
+= MAX(min_length
, ds
->allocated
);
62 ds
->allocated
= MAX(8, ds
->allocated
);
63 ds
->string
= xrealloc(ds
->string
, ds
->allocated
+ 1);
67 /* Appends space for 'n' bytes to the end of 'ds->string', increasing
68 * 'ds->length' by the same amount, and returns the first appended byte. The
69 * caller should fill in all 'n' bytes starting at the return value. */
71 ds_put_uninit(struct ds
*ds
, size_t n
)
73 ds_reserve(ds
, ds
->length
+ n
);
75 ds
->string
[ds
->length
] = '\0';
76 return &ds
->string
[ds
->length
- n
];
80 ds_put_char__(struct ds
*ds
, char c
)
82 *ds_put_uninit(ds
, 1) = c
;
85 /* Appends unicode code point 'uc' to 'ds' in UTF-8 encoding. */
87 ds_put_utf8(struct ds
*ds
, int uc
)
91 } else if (uc
<= 0x7ff) {
92 ds_put_char(ds
, 0xc0 | (uc
>> 6));
93 ds_put_char(ds
, 0x80 | (uc
& 0x3f));
94 } else if (uc
<= 0xffff) {
95 ds_put_char(ds
, 0xe0 | (uc
>> 12));
96 ds_put_char(ds
, 0x80 | ((uc
>> 6) & 0x3f));
97 ds_put_char(ds
, 0x80 | (uc
& 0x3f));
98 } else if (uc
<= 0x10ffff) {
99 ds_put_char(ds
, 0xf0 | (uc
>> 18));
100 ds_put_char(ds
, 0x80 | ((uc
>> 12) & 0x3f));
101 ds_put_char(ds
, 0x80 | ((uc
>> 6) & 0x3f));
102 ds_put_char(ds
, 0x80 | (uc
& 0x3f));
104 /* Invalid code point. Insert the Unicode general substitute
105 * REPLACEMENT CHARACTER. */
106 ds_put_utf8(ds
, 0xfffd);
111 ds_put_char_multiple(struct ds
*ds
, char c
, size_t n
)
113 memset(ds_put_uninit(ds
, n
), c
, n
);
117 ds_put_buffer(struct ds
*ds
, const char *s
, size_t n
)
119 memcpy(ds_put_uninit(ds
, n
), s
, n
);
123 ds_put_cstr(struct ds
*ds
, const char *s
)
125 size_t s_len
= strlen(s
);
126 memcpy(ds_put_uninit(ds
, s_len
), s
, s_len
);
130 ds_put_and_free_cstr(struct ds
*ds
, char *s
)
137 ds_put_format(struct ds
*ds
, const char *format
, ...)
141 va_start(args
, format
);
142 ds_put_format_valist(ds
, format
, args
);
147 ds_put_format_valist(struct ds
*ds
, const char *format
, va_list args_
)
153 va_copy(args
, args_
);
154 available
= ds
->string
? ds
->allocated
- ds
->length
+ 1 : 0;
155 needed
= vsnprintf(&ds
->string
[ds
->length
], available
, format
, args
);
158 if (needed
< available
) {
159 ds
->length
+= needed
;
161 ds_reserve(ds
, ds
->length
+ needed
);
163 va_copy(args
, args_
);
164 available
= ds
->allocated
- ds
->length
+ 1;
165 needed
= vsnprintf(&ds
->string
[ds
->length
], available
, format
, args
);
168 assert(needed
< available
);
169 ds
->length
+= needed
;
174 ds_put_printable(struct ds
*ds
, const char *s
, size_t n
)
176 ds_reserve(ds
, ds
->length
+ n
);
178 unsigned char c
= *s
++;
179 if (c
< 0x20 || c
> 0x7e || c
== '\\' || c
== '"') {
180 ds_put_format(ds
, "\\%03o", (int) c
);
187 /* Writes the current time to 'string' based on 'template'.
188 * The current time is either localtime or UTC based on 'utc'. */
190 ds_put_strftime(struct ds
*ds
, const char *template, bool utc
)
193 time_t now
= time_wall();
197 tm
= localtime(&now
);
201 size_t avail
= ds
->string
? ds
->allocated
- ds
->length
+ 1 : 0;
202 size_t used
= strftime(&ds
->string
[ds
->length
], avail
, template, tm
);
207 ds_reserve(ds
, ds
->length
+ (avail
< 32 ? 64 : 2 * avail
));
212 ds_get_line(struct ds
*ds
, FILE *file
)
218 return ds
->length
? 0 : EOF
;
219 } else if (c
== '\n') {
227 /* Reads a line from 'file' into 'ds', clearing anything initially in 'ds'.
228 * Deletes comments introduced by "#" and skips lines that contains only white
229 * space (after deleting comments).
231 * Returns 0 if successful, EOF if no non-blank line was found. */
233 ds_get_preprocessed_line(struct ds
*ds
, FILE *file
)
235 while (!ds_get_line(ds
, file
)) {
236 char *line
= ds_cstr(ds
);
239 /* Delete comments. */
240 comment
= strchr(line
, '#');
245 /* Return successfully unless the line is all spaces. */
246 if (line
[strspn(line
, " \t\n")] != '\0') {
254 ds_cstr(struct ds
*ds
)
259 ds
->string
[ds
->length
] = '\0';
264 ds_cstr_ro(const struct ds
*ds
)
266 return ds_cstr((struct ds
*) ds
);
269 /* Returns a null-terminated string representing the current contents of 'ds',
270 * which the caller is expected to free with free(), then clears the contents
273 ds_steal_cstr(struct ds
*ds
)
275 char *s
= ds_cstr(ds
);
281 ds_destroy(struct ds
*ds
)
286 /* Swaps the content of 'a' and 'b'. */
288 ds_swap(struct ds
*a
, struct ds
*b
)
295 /* Writes the 'size' bytes in 'buf' to 'string' as hex bytes arranged 16 per
296 * line. Numeric offsets are also included, starting at 'ofs' for the first
297 * byte in 'buf'. If 'ascii' is true then the corresponding ASCII characters
298 * are also rendered alongside. */
300 ds_put_hex_dump(struct ds
*ds
, const void *buf_
, size_t size
,
301 uintptr_t ofs
, bool ascii
)
303 const uint8_t *buf
= buf_
;
304 const size_t per_line
= 16; /* Maximum bytes per line. */
308 size_t start
, end
, n
;
311 /* Number of bytes on this line. */
312 start
= ofs
% per_line
;
314 if (end
- start
> size
)
319 ds_put_format(ds
, "%08jx ", (uintmax_t) ROUND_DOWN(ofs
, per_line
));
320 for (i
= 0; i
< start
; i
++)
321 ds_put_format(ds
, " ");
323 ds_put_format(ds
, "%02hhx%c",
324 buf
[i
- start
], i
== per_line
/ 2 - 1? '-' : ' ');
327 for (; i
< per_line
; i
++)
328 ds_put_format(ds
, " ");
329 ds_put_format(ds
, "|");
330 for (i
= 0; i
< start
; i
++)
331 ds_put_format(ds
, " ");
332 for (; i
< end
; i
++) {
333 int c
= buf
[i
- start
];
334 ds_put_char(ds
, c
>= 32 && c
< 127 ? c
: '.');
336 for (; i
< per_line
; i
++)
337 ds_put_format(ds
, " ");
338 ds_put_format(ds
, "|");
340 ds_put_format(ds
, "\n");
349 ds_last(const struct ds
*ds
)
351 return ds
->length
> 0 ? (unsigned char) ds
->string
[ds
->length
- 1] : EOF
;
355 ds_chomp(struct ds
*ds
, int c
)
357 if (ds
->length
> 0 && ds
->string
[ds
->length
- 1] == (char) c
) {
358 ds
->string
[--ds
->length
] = '\0';