2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 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"
25 /* Initializes 'ds' as an empty string buffer. */
27 ds_init(struct ds *ds)
34 /* Sets 'ds''s length to 0, effectively clearing any existing content. Does
35 * not free any memory. */
37 ds_clear(struct ds *ds)
42 /* Reduces 'ds''s length to no more than 'new_length'. (If its length is
43 * already 'new_length' or less, does nothing.) */
45 ds_truncate(struct ds *ds, size_t new_length)
47 if (ds->length > new_length) {
48 ds->length = new_length;
49 ds->string[new_length] = '\0';
53 /* Ensures that at least 'min_length + 1' bytes (including space for a null
54 * terminator) are allocated for ds->string, allocating or reallocating memory
57 ds_reserve(struct ds *ds, size_t min_length)
59 if (min_length > ds->allocated || !ds->string) {
60 ds->allocated += MAX(min_length, ds->allocated);
61 ds->allocated = MAX(8, ds->allocated);
62 ds->string = xrealloc(ds->string, ds->allocated + 1);
66 /* Appends space for 'n' bytes to the end of 'ds->string', increasing
67 * 'ds->length' by the same amount, and returns the first appended byte. The
68 * caller should fill in all 'n' bytes starting at the return value. */
70 ds_put_uninit(struct ds *ds, size_t n)
72 ds_reserve(ds, ds->length + n);
74 ds->string[ds->length] = '\0';
75 return &ds->string[ds->length - n];
79 ds_put_char__(struct ds *ds, char c)
81 *ds_put_uninit(ds, 1) = c;
84 /* Appends unicode code point 'uc' to 'ds' in UTF-8 encoding. */
86 ds_put_utf8(struct ds *ds, int uc)
90 } else if (uc <= 0x7ff) {
91 ds_put_char(ds, 0xc0 | (uc >> 6));
92 ds_put_char(ds, 0x80 | (uc & 0x3f));
93 } else if (uc <= 0xffff) {
94 ds_put_char(ds, 0xe0 | (uc >> 12));
95 ds_put_char(ds, 0x80 | ((uc >> 6) & 0x3f));
96 ds_put_char(ds, 0x80 | (uc & 0x3f));
97 } else if (uc <= 0x10ffff) {
98 ds_put_char(ds, 0xf0 | (uc >> 18));
99 ds_put_char(ds, 0x80 | ((uc >> 12) & 0x3f));
100 ds_put_char(ds, 0x80 | ((uc >> 6) & 0x3f));
101 ds_put_char(ds, 0x80 | (uc & 0x3f));
103 /* Invalid code point. Insert the Unicode general substitute
104 * REPLACEMENT CHARACTER. */
105 ds_put_utf8(ds, 0xfffd);
110 ds_put_char_multiple(struct ds *ds, char c, size_t n)
112 memset(ds_put_uninit(ds, n), c, n);
116 ds_put_buffer(struct ds *ds, const char *s, size_t n)
118 memcpy(ds_put_uninit(ds, n), s, n);
122 ds_put_cstr(struct ds *ds, const char *s)
124 size_t s_len = strlen(s);
125 memcpy(ds_put_uninit(ds, s_len), s, s_len);
129 ds_put_and_free_cstr(struct ds *ds, char *s)
136 ds_put_format(struct ds *ds, const char *format, ...)
140 va_start(args, format);
141 ds_put_format_valist(ds, format, args);
146 ds_put_format_valist(struct ds *ds, const char *format, va_list args_)
152 va_copy(args, args_);
153 available = ds->string ? ds->allocated - ds->length + 1 : 0;
154 needed = vsnprintf(&ds->string[ds->length], available, format, args);
157 if (needed < available) {
158 ds->length += needed;
160 ds_reserve(ds, ds->length + needed);
162 va_copy(args, args_);
163 available = ds->allocated - ds->length + 1;
164 needed = vsnprintf(&ds->string[ds->length], available, format, args);
167 ovs_assert(needed < available);
168 ds->length += needed;
173 ds_put_printable(struct ds *ds, const char *s, size_t n)
175 ds_reserve(ds, ds->length + n);
177 unsigned char c = *s++;
178 if (c < 0x20 || c > 0x7e || c == '\\' || c == '"') {
179 ds_put_format(ds, "\\%03o", (int) c);
186 /* Writes time 'when' to 'string' based on 'template', in local time or UTC
189 ds_put_strftime(struct ds *ds, const char *template, time_t when, bool utc)
193 gmtime_r(&when, &tm);
195 localtime_r(&when, &tm);
199 size_t avail = ds->string ? ds->allocated - ds->length + 1 : 0;
200 size_t used = strftime(&ds->string[ds->length], avail, template, &tm);
205 ds_reserve(ds, ds->length + (avail < 32 ? 64 : 2 * avail));
209 /* Returns a malloc()'d string for time 'when' based on 'template', in local
210 * time or UTC based on 'utc'. */
212 xastrftime(const char *template, time_t when, bool utc)
217 ds_put_strftime(&s, template, when, utc);
222 ds_get_line(struct ds *ds, FILE *file)
228 return ds->length ? 0 : EOF;
229 } else if (c == '\n') {
237 /* Reads a line from 'file' into 'ds', clearing anything initially in 'ds'.
238 * Deletes comments introduced by "#" and skips lines that contains only white
239 * space (after deleting comments).
241 * If 'line_numberp' is nonnull, increments '*line_numberp' by the number of
242 * lines read from 'file'.
244 * Returns 0 if successful, EOF if no non-blank line was found. */
246 ds_get_preprocessed_line(struct ds *ds, FILE *file, int *line_numberp)
248 while (!ds_get_line(ds, file)) {
249 char *line = ds_cstr(ds);
256 /* Delete comments. */
257 comment = strchr(line, '#');
262 /* Return successfully unless the line is all spaces. */
263 if (line[strspn(line, " \t\n")] != '\0') {
270 /* Reads a line from 'file' into 'ds' and does some preprocessing on it:
272 * - If the line begins with #, prints it on stdout and reads the next line.
274 * - Otherwise, if the line contains an # somewhere else, strips it and
275 * everything following it (as a comment).
277 * - If (after comment removal) the line contains only white space, prints
278 * a blank line on stdout and reads the next line.
280 * - Otherwise, returns the line to the caller.
282 * This is useful in some of the OVS tests, where we want to check that parsing
283 * and then re-formatting some kind of data does not change it, but we also
284 * want to be able to put comments in the input.
286 * Returns 0 if successful, EOF if no non-blank line was found. */
288 ds_get_test_line(struct ds *ds, FILE *file)
294 retval = ds_get_line(ds, file);
305 comment = strchr(s, '#');
309 if (s[strspn(s, " \t\n")] == '\0') {
319 ds_cstr(struct ds *ds)
324 ds->string[ds->length] = '\0';
329 ds_cstr_ro(const struct ds *ds)
331 return ds_cstr(CONST_CAST(struct ds *, ds));
334 /* Returns a null-terminated string representing the current contents of 'ds',
335 * which the caller is expected to free with free(), then clears the contents
338 ds_steal_cstr(struct ds *ds)
340 char *s = ds_cstr(ds);
346 ds_destroy(struct ds *ds)
351 /* Swaps the content of 'a' and 'b'. */
353 ds_swap(struct ds *a, struct ds *b)
360 /* Writes the 'size' bytes in 'buf' to 'string' as hex bytes arranged 16 per
361 * line. Numeric offsets are also included, starting at 'ofs' for the first
362 * byte in 'buf'. If 'ascii' is true then the corresponding ASCII characters
363 * are also rendered alongside. */
365 ds_put_hex_dump(struct ds *ds, const void *buf_, size_t size,
366 uintptr_t ofs, bool ascii)
368 const uint8_t *buf = buf_;
369 const size_t per_line = 16; /* Maximum bytes per line. */
372 size_t start, end, n;
375 /* Number of bytes on this line. */
376 start = ofs % per_line;
378 if (end - start > size)
383 ds_put_format(ds, "%08jx ", (uintmax_t) ROUND_DOWN(ofs, per_line));
384 for (i = 0; i < start; i++) {
385 ds_put_format(ds, " ");
387 for (; i < end; i++) {
388 ds_put_format(ds, "%02hhx%c",
389 buf[i - start], i == per_line / 2 - 1? '-' : ' ');
392 for (; i < per_line; i++)
393 ds_put_format(ds, " ");
394 ds_put_format(ds, "|");
395 for (i = 0; i < start; i++)
396 ds_put_format(ds, " ");
397 for (; i < end; i++) {
398 int c = buf[i - start];
399 ds_put_char(ds, c >= 32 && c < 127 ? c : '.');
401 for (; i < per_line; i++)
402 ds_put_format(ds, " ");
403 ds_put_format(ds, "|");
407 ds_put_format(ds, "\n");
416 ds_last(const struct ds *ds)
418 return ds->length > 0 ? (unsigned char) ds->string[ds->length - 1] : EOF;
422 ds_chomp(struct ds *ds, int c)
424 if (ds->length > 0 && ds->string[ds->length - 1] == (char) c) {
425 ds->string[--ds->length] = '\0';