1 /*******************************************************************
2 uLan Utilities Library - C library of basic reusable constructions
4 ul_dbufmore.c - more functions for dynamically allocated buffer
6 (C) Copyright 2001-2004 by Pavel Pisa - Originator
7 (C) Copyright 2003-2004 by Frantisek Vacek - Originator
9 The uLan utilities library can be used, copied and modified under
11 - GPL - GNU General Public License
12 - LGPL - GNU Lesser General Public License
13 - MPL - Mozilla Public License
14 - and other licenses added by project originators
15 Code can be modified and re-distributed under any combination
16 of the above listed licenses. If contributor does not agree with
17 some of the licenses, he/she can delete appropriate line.
18 Warning, if you delete all lines, you are not allowed to
19 distribute source code and/or binaries utilizing code.
21 See files COPYING and README for details.
23 *******************************************************************/
25 #include "ul_utmalloc.h"
28 typedef unsigned char byte;
32 //-----------------------------------------------------------------
34 * ul_dbuff_set_capacity - change capacity of buffer to at least @new_capacity
35 * @buf: buffer structure
36 * @new_capacity: new capacity
38 * Returns real capacity of reallocated buffer
40 int ul_dbuff_set_capacity(ul_dbuff_t *buf, int new_capacity)
42 if(new_capacity < 0) new_capacity = 0;
43 #ifdef UL_DBUFF_LOGGING
44 int old_capacity = buf->capacity;
46 if(buf->flags & UL_DBUFF_IS_STATIC) {
47 if(!buf->data || !buf->capacity) {
48 buf->capacity = sizeof(buf->sbuff);
49 buf->data = buf->sbuff;
53 if(new_capacity <= UL_DBUFF_SLEN) {
54 if((buf->data) && (buf->data != buf->sbuff)) {
55 // dynamic storage -> static
56 unsigned long c = buf->capacity;
57 if(c > sizeof(buf->sbuff)) c = sizeof(buf->sbuff);
58 memcpy(buf->sbuff, buf->data, c);
61 buf->capacity = sizeof(buf->sbuff);
62 buf->data = buf->sbuff;
64 else if(new_capacity != buf->capacity) {
65 if(buf->data == buf->sbuff) {
66 // static storage -> dynamic
67 buf->data = malloc((size_t)new_capacity);
68 if(buf->data != NULL) {
69 memcpy(buf->data, buf->sbuff, buf->capacity);
70 buf->capacity = new_capacity;
77 // dynamic storage -> dynamic
78 unsigned char *new_data;
79 new_data = realloc(buf->data, (size_t)new_capacity);
80 if(buf->data != NULL) {
81 buf->capacity = new_capacity;
85 /* Old data are not changed if realloc fails, capacity remains at old value */
86 #ifdef UL_DBUFF_LOGGING
87 vca_log("dbuff", LOG_DEB, "realloc buffer to %d failed\n", new_capacity);
93 if(buf->len > buf->capacity) buf->len = buf->capacity;
94 #ifdef UL_DBUFF_LOGGING
95 vca_log("dbuff", LOG_DEB, "capacity changed from %d to %ld, required %d\n", old_capacity, buf->capacity, new_capacity);
100 //-----------------------------------------------------------------
102 * ul_dbuff_set_len - sets a new len of the buffer, change the capacity if neccessary
103 * @buf: buffer structure
104 * @new_len: new desired buffer length
106 * Returns new buffer length
108 int ul_dbuff_set_len(ul_dbuff_t *buf, int new_len)
110 if(new_len < 0) new_len = 0;
111 if(new_len > buf->capacity) {
112 unsigned long new_cap = UL_DBUFF_SLEN;
113 for(; new_cap < new_len; new_cap <<= 1);
114 ul_dbuff_set_capacity(buf, new_cap);
116 if(new_len > buf->capacity) {
117 buf->data = buf->sbuff;
118 strncpy(buf->data, "set_len ERROR", buf->capacity);
119 new_len = buf->capacity;
125 //-----------------------------------------------------------------
127 * ul_dbuff_cpy - copies bytes to buffer and change its capacity if neccessary like memset
128 * @buf: buffer structure
130 * @n: number of apended bytes
132 * Returns: length of buffer
134 int ul_dbuff_set(ul_dbuff_t *buf, byte b, int n)
136 ul_dbuff_set_len(buf, n);
137 memset(buf->data, b, buf->len);
141 //-----------------------------------------------------------------
143 * ul_dbuff_cpy - copies bytes to buffer and change its capacity if neccessary
144 * @buf: buffer structure
146 * @n: number of apended bytes
148 * Returns: length of buffer
150 int ul_dbuff_cpy(ul_dbuff_t *buf, const void *b, int n)
152 if(b == NULL) return 0;
153 ul_dbuff_set_len(buf, n);
154 memcpy(buf->data, b, buf->len);
158 //-----------------------------------------------------------------
160 * ul_dbuff_cat - appends bytes at end of buffer and change its capacity if neccessary
161 * @buf: buffer structure
163 * @n: number of apended bytes
165 * Returns: length of buffer
167 int ul_dbuff_cat(ul_dbuff_t *buf, const void *b, int n)
169 unsigned long old_len = buf->len;
170 unsigned long new_len = old_len + n;
171 if(b == NULL) return 0;
172 if(new_len == ul_dbuff_set_len(buf, new_len)) {
173 memcpy(buf->data + old_len, b, n);
175 #ifdef UL_DBUFF_LOGGING
177 vca_log("dbuff", LOG_DEB, "ul_dbuff_cat: set_len(%lu) error, old_len == %lu\n, act len == %lu\n", new_len, old_len, buf->len);
183 //-----------------------------------------------------------------
185 * ul_dbuff_strcat - appends str at dhe end of buffer and change its capacity if neccessary
186 * @buf: buffer structure
187 * @str: string to append
189 * Returns number length of buffer (including terminating '\0')
191 inline int ul_dbuff_strcat(ul_dbuff_t *buf, const char *str)
194 #ifdef UL_DBUFF_LOGGING
195 if(buf->len > 0) vca_log("dbuff", LOG_DEB, "ul_dbuff_strcat: '%s' + '%s'\n", buf->data, str);
196 else vca_log("dbuff", LOG_DEB, "ul_dbuff_strcat: '' + %s\n", str);
199 if(str == NULL) return 0;
200 if(buf->len > 0 && buf->data[buf->len-1] == '\0') {
201 /* #ifdef UL_DBUFF_LOGGING
202 vca_log("dbuff", LOG_DEB, "ul_dbuff_strcat: terminating zero found at %ld, after '%c'\n", buf->len-1, buf->data[buf->len - 2]);
205 ul_dbuff_set_len(buf, buf->len - 1);
207 #ifdef UL_DBUFF_LOGGING
208 if(buf->len > 0 && buf->data[buf->len-1] != '\0') {
209 vca_log("dbuff", LOG_ERR, "ul_dbuff_strcat: terminating zero not found at %ld, found '%c'\n", buf->len-1, buf->data[buf->len-1]);
212 /* #ifdef UL_DBUFF_LOGGING
213 ul_dbuff_cat(buf, str, strlen(str) + 1);
214 vca_log("dbuff", LOG_DEB, "ul_dbuff_strcat: returning '%s'\n", buf->data);
217 return ul_dbuff_cat(buf, str, strlen(str) + 1);
219 return ul_dbuff_cat(buf, str, strlen(str) + 1);
222 //-----------------------------------------------------------------
224 * ul_dbuff_strcpy - copy str to the buffer and change its capacity if neccessary
225 * @buf: buffer structure
226 * @str: string to copy
228 * Returns number length of buffer (including terminating '\0')
230 inline int ul_dbuff_strcpy(ul_dbuff_t *buf, const char *str)
232 ul_dbuff_set_len(buf, 0);
233 return ul_dbuff_strcat(buf, str);
236 //-----------------------------------------------------------------
238 * ul_dbuff_append_byte - appends byte at dhe end of buffer and change its capacity if neccessary
239 * @buf: buffer structure
242 * Returns number length of buffer (including terminating '\0')
244 inline int ul_dbuff_append_byte(ul_dbuff_t *buf, unsigned char b)
246 return ul_dbuff_cat(buf, &b, 1);
249 //-----------------------------------------------------------------
251 * ul_dbuff_ltrim - remove all white space characters from the left
252 * @buf: buffer structure
254 * Return: new length of buffer
256 int ul_dbuff_ltrim(ul_dbuff_t *buf)
258 byte *pb = buf->data;
260 for(i=0; pb[i]<=' ' && i<buf->len; i++);
262 for(j=i, i=0; j<buf->len; j++, i++) pb[i] = pb[j];
268 //-----------------------------------------------------------------
270 * ul_dbuff_rtrim - remove all white space characters from the right
271 * @buf: buffer structure
273 * if buffer is terminated by '\0', than is also terminated after rtrim
275 * Return: new length of buffer
277 int ul_dbuff_rtrim(ul_dbuff_t *buf)
279 int i = buf->len - 1;
280 unsigned char *pb = buf->data;
282 if(i < 0) return buf->len;
283 if(pb[i] == '\0') terminated = 1;
287 if(terminated) pb[i++] = '\0';
295 //-----------------------------------------------------------------
297 * ul_dbuff_trim - remove all white space characters from the right and from the left
298 * @buf: buffer structure
300 * Returns number length of buffer (including terminating '\0')
302 int ul_dbuff_trim(ul_dbuff_t *buf)
305 return ul_dbuff_ltrim(buf);
307 //-----------------------------------------------------------------
309 * ul_dbuff_cpos - searches string for char
310 * @buf: searched dbuff
311 * @what: char to find
312 * @quote: skip str areas quoted in quote chars<br>
313 * If you want to ignore quotes assign '\0' to quote in function call
315 * Return: position of what char or negative value
317 int ul_dbuff_cpos(const ul_dbuff_t *buf, unsigned char what, unsigned char quote)
321 unsigned char *bytes = buf->data;
322 for(ret = 0; ret < buf->len; ret++) {
323 if(bytes[ret] == quote) {
324 in_quotes = !in_quotes;
327 if(bytes[ret] == what && !in_quotes) {
331 if(ret >= buf->len) ret = -1;
334 //-----------------------------------------------------------------
336 * ul_str_cpos - searches string for char
337 * @str: zero terminated string
338 * @what: char to find
339 * @quote: skip str areas quoted in quote chars
340 * If you want to ignore quotes assign '\0' to quote in function call
342 * Return: position of what char or negative value
344 int ul_str_cpos(const unsigned char *str, unsigned char what, unsigned char quote)
348 for(ret = 0; str[ret]; ret++) {
349 if(str[ret] == quote) {
350 in_quotes = !in_quotes;
353 if(str[ret] == what && !in_quotes) {
357 if(!str[ret]) ret = -1;
360 //-----------------------------------------------------------------
362 * ul_str_pos - searches string for substring
363 * @str: zero terminated string
364 * @what: string to find
365 * @quote: skip str areas quoted in quote chars
366 * If you want to ignore quotes assign '\0' to quote in function call
368 * Return: position of what string or negative value
370 int ul_str_pos(const unsigned char *str, const unsigned char *what, unsigned char quote)
374 for(ret = 0; str[ret]; ret++) {
375 if(str[ret] == quote) {
376 in_quotes = !in_quotes;
381 for(i=0; str[ret + i]==what[i] && what[i]; i++);
382 if(!what[i]) return ret;
387 //-----------------------------------------------------------------
389 * ul_str_ncpy - copies string to the buffer
390 * @to: buffer where to copy str
391 * @from: zero terminated string
392 * @buff_size: size of the @to buffer (including terminating zero)
394 * Standard strncpy function have some disadvatages
395 * (ie. do not append term. zero if copied string doesn't fit in to buffer, fills whole rest of buffer with zeros)
397 * Returns strlen(to) or negative value in case of error
399 int ul_str_ncpy(unsigned char *to, const unsigned char *from, int buff_size)
402 if(!to || !from) return -1;
403 if(buff_size <= 0) return -2;
404 for(i=0; i<buff_size-1 && from[i]; i++) to[i] = from[i];
408 //-----------------------------------------------------------------
410 * ul_dbuff_cut_pos - cut first @n bytes from @fromdb and copies it to @todb.
411 * If @n is greater than fromdb.len whole @fromdb is copied to @todb.
412 * If @n is negative position to cut is counted from the end of @fromdb.
413 * If @n is zero @fromdb stays unchanged and todb is resized to len equal zero.
414 * @fromdb: buffer to cut from
415 * @todb: buffer to copy to
416 * @n: position where to cut
418 void ul_dbuff_cut_pos(ul_dbuff_t *fromdb, ul_dbuff_t *todb, int n)
421 if(n < 0) n = fromdb->len + n;
423 if(n > fromdb->len) n = fromdb->len;
424 newlen = fromdb->len - n;
425 ul_dbuff_cpy(todb, fromdb->data, n);
426 memmove(fromdb->data, fromdb->data + n, fromdb->len - n);
427 ul_dbuff_set_len(fromdb, newlen);
429 //-----------------------------------------------------------------
431 * ul_dbuff_cut - cuts bytes before delimiter + delimiter char from @fromdb and copies tham to the @todb
432 * If @fromdb doesn't contain delimiter @todb is trimmed to zero length.
433 * @fromdb: buffer to cut from
434 * @todb: buffer to copy to
435 * @delimiter: delimiter char
436 * @quote: quoted delimiters are ignored, @quote can be '\0', than it is ignored.
438 void ul_dbuff_cut_delimited(ul_dbuff_t *fromdb, ul_dbuff_t *todb, char delimiter, char quote)
440 int pos = ul_dbuff_cpos(fromdb, delimiter, quote);
441 if(pos < 0) pos = -1;
442 ul_dbuff_cut_pos(fromdb, todb, pos+1);
444 //-----------------------------------------------------------------
446 * ul_dbuff_cut_token - cuts not whitespaces from %fromdb to %todb.
447 * Leading whitespaces are ignored. Cut string is trimmed.
448 * @fromdb: buffer to cut from
449 * @todb: buffer to copy to
451 void ul_dbuff_cut_token(ul_dbuff_t *fromdb, ul_dbuff_t *todb)
453 const unsigned char *pc = (unsigned char*)fromdb->data;
455 // skip leading white spaces
456 for(pos=0; pc[pos]>0 && pc[pos]<=' ' && pos<fromdb->len; pos++);
458 for(; pc[pos]>' ' && pos<fromdb->len; pos++);
459 ul_dbuff_cut_pos(fromdb, todb, pos);
462 //-----------------------------------------------------------------