3 #define BUFFER_OVERFLOW_EOF "EOF"
5 static inline void buffer_overflow_init(BUFFER *b)
7 b->buffer[b->size] = '\0';
8 strcpy(&b->buffer[b->size + 1], BUFFER_OVERFLOW_EOF);
11 #ifdef NETDATA_INTERNAL_CHECKS
12 #define buffer_overflow_check(b) _buffer_overflow_check(b, __FILE__, __FUNCTION__, __LINE__)
14 #define buffer_overflow_check(b)
17 static inline void _buffer_overflow_check(BUFFER *b, const char *file, const char *function, const unsigned long line)
19 if(b->len > b->size) {
20 error("BUFFER: length %zu is above size %zu, at line %lu, at function %s() of file '%s'.", b->len, b->size, line, function, file);
24 if(b->buffer[b->size] != '\0' || strcmp(&b->buffer[b->size + 1], BUFFER_OVERFLOW_EOF)) {
25 error("BUFFER: detected overflow at line %lu, at function %s() of file '%s'.", line, function, file);
26 buffer_overflow_init(b);
31 void buffer_reset(BUFFER *wb)
35 wb->contenttype = CT_TEXT_PLAIN;
39 buffer_overflow_check(wb);
42 const char *buffer_tostring(BUFFER *wb)
44 buffer_need_bytes(wb, 1);
45 wb->buffer[wb->len] = '\0';
47 buffer_overflow_check(wb);
52 void buffer_char_replace(BUFFER *wb, char from, char to)
54 char *s = wb->buffer, *end = &wb->buffer[wb->len];
57 if(*s == from) *s = to;
61 buffer_overflow_check(wb);
64 // This trick seems to give an 80% speed increase in 32bit systems
65 // print_calculated_number_llu_r() will just print the digits up to the
66 // point the remaining value fits in 32 bits, and then calls
67 // print_calculated_number_lu_r() to print the rest with 32 bit arithmetic.
69 inline char *print_number_lu_r(char *str, unsigned long uvalue) {
73 do *wstr++ = (char)('0' + (uvalue % 10)); while(uvalue /= 10);
77 inline char *print_number_llu_r(char *str, unsigned long long uvalue) {
81 do *wstr++ = (char)('0' + (uvalue % 10)); while((uvalue /= 10) && uvalue > (unsigned long long)0xffffffff);
82 if(uvalue) return print_number_lu_r(wstr, uvalue);
86 void buffer_print_llu(BUFFER *wb, unsigned long long uvalue)
88 buffer_need_bytes(wb, 50);
90 char *str = &wb->buffer[wb->len];
94 if(uvalue > (unsigned long long)0xffffffff)
95 wstr = print_number_llu_r(wstr, uvalue);
97 wstr = print_number_lu_r(wstr, uvalue);
99 do *wstr++ = (char)('0' + (uvalue % 10)); while(uvalue /= 10);
106 char *begin = str, *end = wstr - 1, aux;
107 while (end > begin) aux = *end, *end-- = *begin, *begin++ = aux;
109 // return the buffer length
110 wb->len += wstr - str;
113 void buffer_strcat(BUFFER *wb, const char *txt)
115 if(unlikely(!txt || !*txt)) return;
117 buffer_need_bytes(wb, 1);
119 char *s = &wb->buffer[wb->len], *start, *end = &wb->buffer[wb->size];
120 size_t len = wb->len;
123 while(*txt && s != end)
129 buffer_overflow_check(wb);
132 debug(D_WEB_BUFFER, "strcat(): increasing web_buffer at position %zu, size = %zu\n", wb->len, wb->size);
134 buffer_increase(wb, len);
135 buffer_strcat(wb, txt);
138 // terminate the string
139 // without increasing the length
140 buffer_need_bytes(wb, (size_t)1);
141 wb->buffer[wb->len] = '\0';
146 void buffer_snprintf(BUFFER *wb, size_t len, const char *fmt, ...)
148 if(unlikely(!fmt || !*fmt)) return;
150 buffer_need_bytes(wb, len + 1);
154 wb->len += vsnprintfz(&wb->buffer[wb->len], len, fmt, args);
157 buffer_overflow_check(wb);
159 // the buffer is \0 terminated by vsnprintfz
162 void buffer_vsprintf(BUFFER *wb, const char *fmt, va_list args)
164 if(unlikely(!fmt || !*fmt)) return;
166 buffer_need_bytes(wb, 2);
168 size_t len = wb->size - wb->len - 1;
170 wb->len += vsnprintfz(&wb->buffer[wb->len], len, fmt, args);
172 buffer_overflow_check(wb);
174 // the buffer is \0 terminated by vsnprintfz
177 void buffer_sprintf(BUFFER *wb, const char *fmt, ...)
179 if(unlikely(!fmt || !*fmt)) return;
181 buffer_need_bytes(wb, 2);
183 size_t len = wb->size - wb->len - 1;
188 wrote = (size_t) vsnprintfz(&wb->buffer[wb->len], len, fmt, args);
191 if(unlikely(wrote >= len)) {
192 // there is bug in vsnprintf() and it returns
193 // a number higher to len, but it does not
194 // overflow the buffer.
195 // our buffer overflow detector will log it
197 buffer_overflow_check(wb);
199 debug(D_WEB_BUFFER, "web_buffer_sprintf(): increasing web_buffer at position %zu, size = %zu\n", wb->len, wb->size);
200 buffer_need_bytes(wb, len + WEB_DATA_LENGTH_INCREASE_STEP);
203 buffer_vsprintf(wb, fmt, args);
209 // the buffer is \0 terminated by vsnprintf
213 void buffer_rrd_value(BUFFER *wb, calculated_number value)
215 buffer_need_bytes(wb, 50);
217 if(isnan(value) || isinf(value)) {
218 buffer_strcat(wb, "null");
222 wb->len += print_calculated_number(&wb->buffer[wb->len], value);
225 buffer_need_bytes(wb, 1);
226 wb->buffer[wb->len] = '\0';
228 buffer_overflow_check(wb);
231 // generate a javascript date, the fastest possible way...
232 void buffer_jsdate(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)
235 // 01234567890123456789012345678901234
236 // Date(2014,04,01,03,28,20)
238 buffer_need_bytes(wb, 30);
240 char *b = &wb->buffer[wb->len], *p;
241 unsigned int *q = (unsigned int *)b;
243 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
244 *q++ = 0x65746144; // "Date" backwards.
246 *q++ = 0x44617465; // "Date"
251 *p++ = '0' + year / 1000; year %= 1000;
252 *p++ = '0' + year / 100; year %= 100;
253 *p++ = '0' + year / 10;
254 *p++ = '0' + year % 10;
256 *p = '0' + month / 10; if (*p != '0') p++;
257 *p++ = '0' + month % 10;
259 *p = '0' + day / 10; if (*p != '0') p++;
260 *p++ = '0' + day % 10;
262 *p = '0' + hours / 10; if (*p != '0') p++;
263 *p++ = '0' + hours % 10;
265 *p = '0' + minutes / 10; if (*p != '0') p++;
266 *p++ = '0' + minutes % 10;
268 *p = '0' + seconds / 10; if (*p != '0') p++;
269 *p++ = '0' + seconds % 10;
271 unsigned short *r = (unsigned short *)p;
273 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
274 *r++ = 0x0029; // ")\0" backwards.
276 *r++ = 0x2900; // ")\0"
279 wb->len += (size_t)((char *)r - b - 1);
282 wb->buffer[wb->len] = '\0';
283 buffer_overflow_check(wb);
286 // generate a date, the fastest possible way...
287 void buffer_date(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)
290 // 01234567890123456789012345678901234
291 // 2014-04-01 03:28:20
293 buffer_need_bytes(wb, 36);
295 char *b = &wb->buffer[wb->len];
298 *p++ = '0' + year / 1000; year %= 1000;
299 *p++ = '0' + year / 100; year %= 100;
300 *p++ = '0' + year / 10;
301 *p++ = '0' + year % 10;
303 *p++ = '0' + month / 10;
304 *p++ = '0' + month % 10;
306 *p++ = '0' + day / 10;
307 *p++ = '0' + day % 10;
309 *p++ = '0' + hours / 10;
310 *p++ = '0' + hours % 10;
312 *p++ = '0' + minutes / 10;
313 *p++ = '0' + minutes % 10;
315 *p++ = '0' + seconds / 10;
316 *p++ = '0' + seconds % 10;
319 wb->len += (size_t)(p - b);
322 wb->buffer[wb->len] = '\0';
323 buffer_overflow_check(wb);
326 BUFFER *buffer_create(size_t size)
330 debug(D_WEB_BUFFER, "Creating new web buffer of size %zu.", size);
332 b = callocz(1, sizeof(BUFFER));
333 b->buffer = mallocz(size + sizeof(BUFFER_OVERFLOW_EOF) + 2);
336 b->contenttype = CT_TEXT_PLAIN;
337 buffer_overflow_init(b);
338 buffer_overflow_check(b);
343 void buffer_free(BUFFER *b)
345 buffer_overflow_check(b);
347 debug(D_WEB_BUFFER, "Freeing web buffer of size %zu.", b->size);
353 void buffer_increase(BUFFER *b, size_t free_size_required)
355 buffer_overflow_check(b);
357 size_t left = b->size - b->len;
359 if(left >= free_size_required) return;
361 size_t increase = free_size_required - left;
362 if(increase < WEB_DATA_LENGTH_INCREASE_STEP) increase = WEB_DATA_LENGTH_INCREASE_STEP;
364 debug(D_WEB_BUFFER, "Increasing data buffer from size %zu to %zu.", b->size, b->size + increase);
366 b->buffer = reallocz(b->buffer, b->size + increase + sizeof(BUFFER_OVERFLOW_EOF) + 2);
369 buffer_overflow_init(b);
370 buffer_overflow_check(b);