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 #define buffer_overflow_check(b) _buffer_overflow_check(b, __FILE__, __FUNCTION__, __LINE__)
25 static inline void _buffer_overflow_check(BUFFER *b, const char *file, const char *function, const unsigned long line)
27 if(b->len > b->size) {
28 error("BUFFER: length %ld is above size %ld, at line %lu, at function %s() of file '%s'.", b->len, b->size, line, function, file);
32 if(b->buffer[b->size] != '\0' || strcmp(&b->buffer[b->size + 1], BUFFER_OVERFLOW_EOF)) {
33 error("BUFFER: detected overflow at line %lu, at function %s() of file '%s'.", line, function, file);
34 buffer_overflow_init(b);
39 void buffer_reset(BUFFER *wb)
43 wb->contenttype = CT_TEXT_PLAIN;
46 buffer_overflow_check(wb);
49 const char *buffer_tostring(BUFFER *wb)
51 buffer_need_bytes(wb, 1);
52 wb->buffer[wb->len] = '\0';
54 buffer_overflow_check(wb);
59 void buffer_char_replace(BUFFER *wb, char from, char to)
61 char *s = wb->buffer, *end = &wb->buffer[wb->len];
64 if(*s == from) *s = to;
68 buffer_overflow_check(wb);
72 void buffer_strcat(BUFFER *wb, const char *txt)
74 if(unlikely(!txt || !*txt)) return;
76 if(wb->size - wb->len < 512)
77 buffer_need_bytes(wb, 512);
79 char *s = &wb->buffer[wb->len], *end = &wb->buffer[wb->size];
82 while(*txt && s != end) {
88 buffer_overflow_check(wb);
91 debug(D_WEB_BUFFER, "strcat(): increasing web_buffer at position %ld, size = %ld\n", wb->len, wb->size);
93 buffer_increase(wb, len);
94 buffer_strcat(wb, txt);
97 // terminate the string
98 // without increasing the length
99 buffer_need_bytes(wb, 1);
100 wb->buffer[wb->len] = '\0';
105 void buffer_snprintf(BUFFER *wb, size_t len, const char *fmt, ...)
107 if(unlikely(!fmt || !*fmt)) return;
109 buffer_need_bytes(wb, len+1);
113 wb->len += vsnprintf(&wb->buffer[wb->len], len+1, fmt, args);
116 buffer_overflow_check(wb);
118 // the buffer is \0 terminated by vsnprintf
121 void buffer_vsprintf(BUFFER *wb, const char *fmt, va_list args)
123 if(unlikely(!fmt || !*fmt)) return;
125 size_t len = wb->size - wb->len;
126 if(unlikely(!len)) return;
128 wb->len += vsnprintf(&wb->buffer[wb->len], len, fmt, args);
130 buffer_overflow_check(wb);
132 // the buffer is \0 terminated by vsnprintf
135 void buffer_sprintf(BUFFER *wb, const char *fmt, ...)
137 if(unlikely(!fmt || !*fmt)) return;
139 if(unlikely(wb->len > wb->size)) {
140 error("web_buffer_sprintf(): already overflown length %ld, size = %ld", wb->len, wb->size);
143 // if(wb->size - wb->len < 512)
144 // web_buffer_need_bytes(wb, 512);
146 size_t len = wb->size - wb->len, wrote;
148 buffer_need_bytes(wb, len);
152 wrote = vsnprintf(&wb->buffer[wb->len], len, fmt, args);
155 if(unlikely(wrote >= len)) {
156 // there is bug in vsnprintf() and it returns
157 // a number higher to len, but it does not
158 // overflow the buffer.
159 // our buffer overflow detector will log it
161 buffer_overflow_check(wb);
163 debug(D_WEB_BUFFER, "web_buffer_sprintf(): increasing web_buffer at position %ld, size = %ld\n", wb->len, wb->size);
164 buffer_need_bytes(wb, len + WEB_DATA_LENGTH_INCREASE_STEP);
167 buffer_vsprintf(wb, fmt, args);
173 // the buffer is \0 terminated by vsnprintf
177 void buffer_rrd_value(BUFFER *wb, calculated_number value)
179 buffer_need_bytes(wb, 50);
180 wb->len += print_calculated_number(&wb->buffer[wb->len], value);
183 buffer_need_bytes(wb, 1);
184 wb->buffer[wb->len] = '\0';
186 buffer_overflow_check(wb);
189 // generate a javascript date, the fastest possible way...
190 void buffer_jsdate(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)
193 // 01234567890123456789012345678901234
194 // Date(2014,04,01,03,28,20)
196 buffer_need_bytes(wb, 30);
198 char *b = &wb->buffer[wb->len];
206 b[i++]= 48 + year / 1000; year -= (year / 1000) * 1000;
207 b[i++]= 48 + year / 100; year -= (year / 100) * 100;
208 b[i++]= 48 + year / 10;
209 b[i++]= 48 + year % 10;
211 b[i]= 48 + month / 10; if(b[i] != '0') i++;
212 b[i++]= 48 + month % 10;
214 b[i]= 48 + day / 10; if(b[i] != '0') i++;
215 b[i++]= 48 + day % 10;
217 b[i]= 48 + hours / 10; if(b[i] != '0') i++;
218 b[i++]= 48 + hours % 10;
220 b[i]= 48 + minutes / 10; if(b[i] != '0') i++;
221 b[i++]= 48 + minutes % 10;
223 b[i]= 48 + seconds / 10; if(b[i] != '0') i++;
224 b[i++]= 48 + seconds % 10;
231 wb->buffer[wb->len] = '\0';
232 buffer_overflow_check(wb);
235 // generate a date, the fastest possible way...
236 void buffer_date(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)
239 // 01234567890123456789012345678901234
240 // 2014-04-01 03:28:20
242 buffer_need_bytes(wb, 36);
244 char *b = &wb->buffer[wb->len];
247 b[i++]= 48 + year / 1000; year -= (year / 1000) * 1000;
248 b[i++]= 48 + year / 100; year -= (year / 100) * 100;
249 b[i++]= 48 + year / 10;
250 b[i++]= 48 + year % 10;
252 b[i++]= 48 + month / 10;
253 b[i++]= 48 + month % 10;
255 b[i++]= 48 + day / 10;
256 b[i++]= 48 + day % 10;
258 b[i++]= 48 + hours / 10;
259 b[i++]= 48 + hours % 10;
261 b[i++]= 48 + minutes / 10;
262 b[i++]= 48 + minutes % 10;
264 b[i++]= 48 + seconds / 10;
265 b[i++]= 48 + seconds % 10;
271 wb->buffer[wb->len] = '\0';
272 buffer_overflow_check(wb);
275 BUFFER *buffer_create(long size)
279 debug(D_WEB_BUFFER, "Creating new web buffer of size %d.", size);
281 b = calloc(1, sizeof(BUFFER));
283 error("Cannot allocate a web_buffer.");
287 b->buffer = malloc(size + sizeof(BUFFER_OVERFLOW_EOF) + 2);
289 error("Cannot allocate a buffer of size %u.", size + sizeof(BUFFER_OVERFLOW_EOF) + 2);
295 b->contenttype = CT_TEXT_PLAIN;
296 buffer_overflow_init(b);
297 buffer_overflow_check(b);
302 void buffer_free(BUFFER *b)
304 buffer_overflow_check(b);
306 debug(D_WEB_BUFFER, "Freeing web buffer of size %d.", b->size);
308 if(b->buffer) free(b->buffer);
312 void buffer_increase(BUFFER *b, long free_size_required)
314 buffer_overflow_check(b);
316 long left = b->size - b->len;
318 if(left >= free_size_required) return;
320 long increase = free_size_required - left;
321 if(increase < WEB_DATA_LENGTH_INCREASE_STEP) increase = WEB_DATA_LENGTH_INCREASE_STEP;
323 debug(D_WEB_BUFFER, "Increasing data buffer from size %d to %d.", b->size, b->size + increase);
325 b->buffer = realloc(b->buffer, b->size + increase + sizeof(BUFFER_OVERFLOW_EOF) + 2);
326 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);
330 buffer_overflow_init(b);
331 buffer_overflow_check(b);