7 #ifdef STORAGE_WITH_MATH
12 #include "web_buffer.h"
15 #define BUFFER_OVERFLOW_EOF "EOF"
17 static inline void buffer_overflow_init(BUFFER *b)
19 b->buffer[b->size] = '\0';
20 strcpy(&b->buffer[b->size + 1], BUFFER_OVERFLOW_EOF);
23 #ifdef NETDATA_INTERNAL_CHECKS
24 #define buffer_overflow_check(b) _buffer_overflow_check(b, __FILE__, __FUNCTION__, __LINE__)
26 #define buffer_overflow_check(b)
29 static inline void _buffer_overflow_check(BUFFER *b, const char *file, const char *function, const unsigned long line)
31 if(b->len > b->size) {
32 error("BUFFER: length %ld is above size %ld, at line %lu, at function %s() of file '%s'.", b->len, b->size, line, function, file);
36 if(b->buffer[b->size] != '\0' || strcmp(&b->buffer[b->size + 1], BUFFER_OVERFLOW_EOF)) {
37 error("BUFFER: detected overflow at line %lu, at function %s() of file '%s'.", line, function, file);
38 buffer_overflow_init(b);
43 void buffer_reset(BUFFER *wb)
47 wb->contenttype = CT_TEXT_PLAIN;
51 buffer_overflow_check(wb);
54 const char *buffer_tostring(BUFFER *wb)
56 buffer_need_bytes(wb, (size_t)1);
57 wb->buffer[wb->len] = '\0';
59 buffer_overflow_check(wb);
64 void buffer_char_replace(BUFFER *wb, char from, char to)
66 char *s = wb->buffer, *end = &wb->buffer[wb->len];
69 if(*s == from) *s = to;
73 buffer_overflow_check(wb);
77 void buffer_strcat(BUFFER *wb, const char *txt)
79 if(unlikely(!txt || !*txt)) return;
81 buffer_need_bytes(wb, (size_t)(1));
83 char *s = &wb->buffer[wb->len], *end = &wb->buffer[wb->size];
86 while(*txt && s != end) {
92 buffer_overflow_check(wb);
95 debug(D_WEB_BUFFER, "strcat(): increasing web_buffer at position %ld, size = %ld\n", wb->len, wb->size);
97 buffer_increase(wb, len);
98 buffer_strcat(wb, txt);
101 // terminate the string
102 // without increasing the length
103 buffer_need_bytes(wb, (size_t)1);
104 wb->buffer[wb->len] = '\0';
109 void buffer_snprintf(BUFFER *wb, size_t len, const char *fmt, ...)
111 if(unlikely(!fmt || !*fmt)) return;
113 buffer_need_bytes(wb, len+1);
117 wb->len += vsnprintf(&wb->buffer[wb->len], len+1, fmt, args);
120 buffer_overflow_check(wb);
122 // the buffer is \0 terminated by vsnprintf
125 void buffer_vsprintf(BUFFER *wb, const char *fmt, va_list args)
127 if(unlikely(!fmt || !*fmt)) return;
129 buffer_need_bytes(wb, 1);
131 size_t len = wb->size - wb->len;
133 wb->len += vsnprintf(&wb->buffer[wb->len], len, fmt, args);
135 buffer_overflow_check(wb);
137 // the buffer is \0 terminated by vsnprintf
140 void buffer_sprintf(BUFFER *wb, const char *fmt, ...)
142 if(unlikely(!fmt || !*fmt)) return;
144 buffer_need_bytes(wb, 1);
146 size_t len = wb->size - wb->len, wrote;
150 wrote = (size_t) vsnprintf(&wb->buffer[wb->len], len, fmt, args);
153 if(unlikely(wrote >= len)) {
154 // there is bug in vsnprintf() and it returns
155 // a number higher to len, but it does not
156 // overflow the buffer.
157 // our buffer overflow detector will log it
159 buffer_overflow_check(wb);
161 debug(D_WEB_BUFFER, "web_buffer_sprintf(): increasing web_buffer at position %ld, size = %ld\n", wb->len, wb->size);
162 buffer_need_bytes(wb, len + WEB_DATA_LENGTH_INCREASE_STEP);
165 buffer_vsprintf(wb, fmt, args);
171 // the buffer is \0 terminated by vsnprintf
175 void buffer_rrd_value(BUFFER *wb, calculated_number value)
177 buffer_need_bytes(wb, 50);
178 wb->len += print_calculated_number(&wb->buffer[wb->len], value);
181 buffer_need_bytes(wb, 1);
182 wb->buffer[wb->len] = '\0';
184 buffer_overflow_check(wb);
187 // generate a javascript date, the fastest possible way...
188 void buffer_jsdate(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)
191 // 01234567890123456789012345678901234
192 // Date(2014,04,01,03,28,20)
194 buffer_need_bytes(wb, 30);
196 char *b = &wb->buffer[wb->len], *p;
197 unsigned int *q = (unsigned int *)b;
199 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
200 *q++ = 0x65746144; // "Date" backwards.
202 *q++ = 0x44617465; // "Date"
207 *p++ = '0' + year / 1000; year %= 1000;
208 *p++ = '0' + year / 100; year %= 100;
209 *p++ = '0' + year / 10;
210 *p++ = '0' + year % 100;
212 *p = '0' + month / 10; if (*p != '0') p++;
213 *p++ = '0' + month % 10;
215 *p = '0' + day / 10; if (*p != '0') p++;
216 *p++ = '0' + day % 10;
218 *p = '0' + hours / 10; if (*p != '0') p++;
219 *p++ = '0' + hours % 10;
221 *p = '0' + minutes / 10; if (*p != '0') p++;
222 *p++ = '0' + minutes % 10;
224 *p = '0' + seconds / 10; if (*p != '0') p++;
225 *p++ = '0' + seconds % 10;
227 unsigned short *r = (unsigned short *)p;
229 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
230 *r++ = 0x0029; // ")\0" backwards.
232 *r++ = 0x2900; // ")\0"
235 wb->len += (size_t)((char *)r - b - 1);
238 wb->buffer[wb->len] = '\0';
239 buffer_overflow_check(wb);
242 // generate a date, the fastest possible way...
243 void buffer_date(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)
246 // 01234567890123456789012345678901234
247 // 2014-04-01 03:28:20
249 buffer_need_bytes(wb, 36);
251 char *b = &wb->buffer[wb->len];
254 *p++ = '0' + year / 1000; year %= 1000;
255 *p++ = '0' + year / 100; year %= 100;
256 *p++ = '0' + year / 10;
257 *p++ = '0' + year % 10;
259 *p++ = '0' + month / 10;
260 *p++ = '0' + month % 10;
262 *p++ = '0' + day / 10;
263 *p++ = '0' + day % 10;
265 *p++ = '0' + hours / 10;
266 *p++ = '0' + hours % 10;
268 *p++ = '0' + minutes / 10;
269 *p++ = '0' + minutes % 10;
271 *p++ = '0' + seconds / 10;
272 *p++ = '0' + seconds % 10;
275 wb->len += (size_t)(p - b);
278 wb->buffer[wb->len] = '\0';
279 buffer_overflow_check(wb);
282 BUFFER *buffer_create(long size)
286 debug(D_WEB_BUFFER, "Creating new web buffer of size %d.", size);
288 b = calloc(1, sizeof(BUFFER));
290 error("Cannot allocate a web_buffer.");
294 b->buffer = malloc(size + sizeof(BUFFER_OVERFLOW_EOF) + 2);
296 error("Cannot allocate a buffer of size %u.", size + sizeof(BUFFER_OVERFLOW_EOF) + 2);
302 b->contenttype = CT_TEXT_PLAIN;
303 buffer_overflow_init(b);
304 buffer_overflow_check(b);
309 void buffer_free(BUFFER *b)
311 buffer_overflow_check(b);
313 debug(D_WEB_BUFFER, "Freeing web buffer of size %d.", b->size);
315 if(b->buffer) free(b->buffer);
319 void buffer_increase(BUFFER *b, size_t free_size_required)
321 buffer_overflow_check(b);
323 size_t left = b->size - b->len;
325 if(left >= free_size_required) return;
327 size_t increase = free_size_required - left;
328 if(increase < WEB_DATA_LENGTH_INCREASE_STEP) increase = WEB_DATA_LENGTH_INCREASE_STEP;
330 debug(D_WEB_BUFFER, "Increasing data buffer from size %d to %d.", b->size, b->size + increase);
332 b->buffer = realloc(b->buffer, b->size + increase + sizeof(BUFFER_OVERFLOW_EOF) + 2);
333 if(!b->buffer) fatal("Failed to increase data buffer from size %d to %d.", b->size + sizeof(BUFFER_OVERFLOW_EOF) + 2, b->size + increase + sizeof(BUFFER_OVERFLOW_EOF) + 2);
337 buffer_overflow_init(b);
338 buffer_overflow_check(b);