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;
50 buffer_overflow_check(wb);
53 const char *buffer_tostring(BUFFER *wb)
55 buffer_need_bytes(wb, 1);
56 wb->buffer[wb->len] = '\0';
58 buffer_overflow_check(wb);
63 void buffer_char_replace(BUFFER *wb, char from, char to)
65 char *s = wb->buffer, *end = &wb->buffer[wb->len];
68 if(*s == from) *s = to;
72 buffer_overflow_check(wb);
76 void buffer_strcat(BUFFER *wb, const char *txt)
78 if(unlikely(!txt || !*txt)) return;
80 if(wb->size - wb->len < 512)
81 buffer_need_bytes(wb, 512);
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, 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 size_t len = wb->size - wb->len;
130 if(unlikely(!len)) return;
132 wb->len += vsnprintf(&wb->buffer[wb->len], len, fmt, args);
134 buffer_overflow_check(wb);
136 // the buffer is \0 terminated by vsnprintf
139 void buffer_sprintf(BUFFER *wb, const char *fmt, ...)
141 if(unlikely(!fmt || !*fmt)) return;
143 if(unlikely(wb->len > wb->size)) {
144 error("web_buffer_sprintf(): already overflown length %ld, size = %ld", wb->len, wb->size);
147 // if(wb->size - wb->len < 512)
148 // web_buffer_need_bytes(wb, 512);
150 size_t len = wb->size - wb->len, wrote;
152 buffer_need_bytes(wb, len);
156 wrote = vsnprintf(&wb->buffer[wb->len], len, fmt, args);
159 if(unlikely(wrote >= len)) {
160 // there is bug in vsnprintf() and it returns
161 // a number higher to len, but it does not
162 // overflow the buffer.
163 // our buffer overflow detector will log it
165 buffer_overflow_check(wb);
167 debug(D_WEB_BUFFER, "web_buffer_sprintf(): increasing web_buffer at position %ld, size = %ld\n", wb->len, wb->size);
168 buffer_need_bytes(wb, len + WEB_DATA_LENGTH_INCREASE_STEP);
171 buffer_vsprintf(wb, fmt, args);
177 // the buffer is \0 terminated by vsnprintf
181 void buffer_rrd_value(BUFFER *wb, calculated_number value)
183 buffer_need_bytes(wb, 50);
184 wb->len += print_calculated_number(&wb->buffer[wb->len], value);
187 buffer_need_bytes(wb, 1);
188 wb->buffer[wb->len] = '\0';
190 buffer_overflow_check(wb);
193 // generate a javascript date, the fastest possible way...
194 void buffer_jsdate(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)
197 // 01234567890123456789012345678901234
198 // Date(2014,04,01,03,28,20)
200 buffer_need_bytes(wb, 30);
202 char *b = &wb->buffer[wb->len];
210 b[i++]= 48 + year / 1000; year -= (year / 1000) * 1000;
211 b[i++]= 48 + year / 100; year -= (year / 100) * 100;
212 b[i++]= 48 + year / 10;
213 b[i++]= 48 + year % 10;
215 b[i]= 48 + month / 10; if(b[i] != '0') i++;
216 b[i++]= 48 + month % 10;
218 b[i]= 48 + day / 10; if(b[i] != '0') i++;
219 b[i++]= 48 + day % 10;
221 b[i]= 48 + hours / 10; if(b[i] != '0') i++;
222 b[i++]= 48 + hours % 10;
224 b[i]= 48 + minutes / 10; if(b[i] != '0') i++;
225 b[i++]= 48 + minutes % 10;
227 b[i]= 48 + seconds / 10; if(b[i] != '0') i++;
228 b[i++]= 48 + seconds % 10;
235 wb->buffer[wb->len] = '\0';
236 buffer_overflow_check(wb);
239 // generate a date, the fastest possible way...
240 void buffer_date(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)
243 // 01234567890123456789012345678901234
244 // 2014-04-01 03:28:20
246 buffer_need_bytes(wb, 36);
248 char *b = &wb->buffer[wb->len];
251 b[i++]= 48 + year / 1000; year -= (year / 1000) * 1000;
252 b[i++]= 48 + year / 100; year -= (year / 100) * 100;
253 b[i++]= 48 + year / 10;
254 b[i++]= 48 + year % 10;
256 b[i++]= 48 + month / 10;
257 b[i++]= 48 + month % 10;
259 b[i++]= 48 + day / 10;
260 b[i++]= 48 + day % 10;
262 b[i++]= 48 + hours / 10;
263 b[i++]= 48 + hours % 10;
265 b[i++]= 48 + minutes / 10;
266 b[i++]= 48 + minutes % 10;
268 b[i++]= 48 + seconds / 10;
269 b[i++]= 48 + seconds % 10;
275 wb->buffer[wb->len] = '\0';
276 buffer_overflow_check(wb);
279 BUFFER *buffer_create(long size)
283 debug(D_WEB_BUFFER, "Creating new web buffer of size %d.", size);
285 b = calloc(1, sizeof(BUFFER));
287 error("Cannot allocate a web_buffer.");
291 b->buffer = malloc(size + sizeof(BUFFER_OVERFLOW_EOF) + 2);
293 error("Cannot allocate a buffer of size %u.", size + sizeof(BUFFER_OVERFLOW_EOF) + 2);
299 b->contenttype = CT_TEXT_PLAIN;
300 buffer_overflow_init(b);
301 buffer_overflow_check(b);
306 void buffer_free(BUFFER *b)
308 buffer_overflow_check(b);
310 debug(D_WEB_BUFFER, "Freeing web buffer of size %d.", b->size);
312 if(b->buffer) free(b->buffer);
316 void buffer_increase(BUFFER *b, long free_size_required)
318 buffer_overflow_check(b);
320 long left = b->size - b->len;
322 if(left >= free_size_required) return;
324 long increase = free_size_required - left;
325 if(increase < WEB_DATA_LENGTH_INCREASE_STEP) increase = WEB_DATA_LENGTH_INCREASE_STEP;
327 debug(D_WEB_BUFFER, "Increasing data buffer from size %d to %d.", b->size, b->size + increase);
329 b->buffer = realloc(b->buffer, b->size + increase + sizeof(BUFFER_OVERFLOW_EOF) + 2);
330 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);
334 buffer_overflow_init(b);
335 buffer_overflow_check(b);