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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#ifdef STORAGE_WITH_MATH
#include <math.h>
#endif
#include "common.h"
#include "web_buffer.h"
#include "log.h"
#define BUFFER_OVERFLOW_EOF "EOF"
static inline void buffer_overflow_init(BUFFER *b)
{
b->buffer[b->size] = '\0';
strcpy(&b->buffer[b->size + 1], BUFFER_OVERFLOW_EOF);
}
#ifdef NETDATA_INTERNAL_CHECKS
#define buffer_overflow_check(b) _buffer_overflow_check(b, __FILE__, __FUNCTION__, __LINE__)
#else
#define buffer_overflow_check(b)
#endif
static inline void _buffer_overflow_check(BUFFER *b, const char *file, const char *function, const unsigned long line)
{
if(b->len > b->size) {
error("BUFFER: length %ld is above size %ld, at line %lu, at function %s() of file '%s'.", b->len, b->size, line, function, file);
b->len = b->size;
}
if(b->buffer[b->size] != '\0' || strcmp(&b->buffer[b->size + 1], BUFFER_OVERFLOW_EOF)) {
error("BUFFER: detected overflow at line %lu, at function %s() of file '%s'.", line, function, file);
buffer_overflow_init(b);
}
}
void buffer_reset(BUFFER *wb)
{
buffer_flush(wb);
wb->contenttype = CT_TEXT_PLAIN;
wb->options = 0;
wb->date = 0;
buffer_overflow_check(wb);
}
const char *buffer_tostring(BUFFER *wb)
{
buffer_need_bytes(wb, (size_t)1);
wb->buffer[wb->len] = '\0';
buffer_overflow_check(wb);
return(wb->buffer);
}
void buffer_char_replace(BUFFER *wb, char from, char to)
{
char *s = wb->buffer, *end = &wb->buffer[wb->len];
while(s != end) {
if(*s == from) *s = to;
s++;
}
buffer_overflow_check(wb);
}
void buffer_strcat(BUFFER *wb, const char *txt)
{
if(unlikely(!txt || !*txt)) return;
buffer_need_bytes(wb, (size_t)(1));
char *s = &wb->buffer[wb->len], *end = &wb->buffer[wb->size];
long len = wb->len;
while(*txt && s != end) {
*s++ = *txt++;
len++;
}
wb->len = len;
buffer_overflow_check(wb);
if(*txt) {
debug(D_WEB_BUFFER, "strcat(): increasing web_buffer at position %ld, size = %ld\n", wb->len, wb->size);
len = strlen(txt);
buffer_increase(wb, len);
buffer_strcat(wb, txt);
}
else {
// terminate the string
// without increasing the length
buffer_need_bytes(wb, (size_t)1);
wb->buffer[wb->len] = '\0';
}
}
void buffer_snprintf(BUFFER *wb, size_t len, const char *fmt, ...)
{
if(unlikely(!fmt || !*fmt)) return;
buffer_need_bytes(wb, len+1);
va_list args;
va_start(args, fmt);
wb->len += vsnprintf(&wb->buffer[wb->len], len+1, fmt, args);
va_end(args);
buffer_overflow_check(wb);
// the buffer is \0 terminated by vsnprintf
}
void buffer_vsprintf(BUFFER *wb, const char *fmt, va_list args)
{
if(unlikely(!fmt || !*fmt)) return;
buffer_need_bytes(wb, 1);
size_t len = wb->size - wb->len;
wb->len += vsnprintf(&wb->buffer[wb->len], len, fmt, args);
buffer_overflow_check(wb);
// the buffer is \0 terminated by vsnprintf
}
void buffer_sprintf(BUFFER *wb, const char *fmt, ...)
{
if(unlikely(!fmt || !*fmt)) return;
buffer_need_bytes(wb, 1);
size_t len = wb->size - wb->len, wrote;
va_list args;
va_start(args, fmt);
wrote = (size_t) vsnprintf(&wb->buffer[wb->len], len, fmt, args);
va_end(args);
if(unlikely(wrote >= len)) {
// there is bug in vsnprintf() and it returns
// a number higher to len, but it does not
// overflow the buffer.
// our buffer overflow detector will log it
// if it does.
buffer_overflow_check(wb);
debug(D_WEB_BUFFER, "web_buffer_sprintf(): increasing web_buffer at position %ld, size = %ld\n", wb->len, wb->size);
buffer_need_bytes(wb, len + WEB_DATA_LENGTH_INCREASE_STEP);
va_start(args, fmt);
buffer_vsprintf(wb, fmt, args);
va_end(args);
}
else
wb->len += wrote;
// the buffer is \0 terminated by vsnprintf
}
void buffer_rrd_value(BUFFER *wb, calculated_number value)
{
buffer_need_bytes(wb, 50);
wb->len += print_calculated_number(&wb->buffer[wb->len], value);
// terminate it
buffer_need_bytes(wb, 1);
wb->buffer[wb->len] = '\0';
buffer_overflow_check(wb);
}
// generate a javascript date, the fastest possible way...
void buffer_jsdate(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)
{
// 10 20 30 = 35
// 01234567890123456789012345678901234
// Date(2014,04,01,03,28,20)
buffer_need_bytes(wb, 30);
char *b = &wb->buffer[wb->len];
int i = 0;
b[i++]='D';
b[i++]='a';
b[i++]='t';
b[i++]='e';
b[i++]='(';
b[i++]= (char) (48 + year / 1000); year -= (year / 1000) * 1000;
b[i++]= (char) (48 + year / 100); year -= (year / 100) * 100;
b[i++]= (char) (48 + year / 10);
b[i++]= (char) (48 + year % 10);
b[i++]=',';
b[i]= (char) (48 + month / 10); if(b[i] != '0') i++;
b[i++]= (char) (48 + month % 10);
b[i++]=',';
b[i]= (char) (48 + day / 10); if(b[i] != '0') i++;
b[i++]= (char) (48 + day % 10);
b[i++]=',';
b[i]= (char) (48 + hours / 10); if(b[i] != '0') i++;
b[i++]= (char) (48 + hours % 10);
b[i++]=',';
b[i]= (char) (48 + minutes / 10); if(b[i] != '0') i++;
b[i++]= (char) (48 + minutes % 10);
b[i++]=',';
b[i]= (char) (48 + seconds / 10); if(b[i] != '0') i++;
b[i++]= (char) (48 + seconds % 10);
b[i++]=')';
b[i]='\0';
wb->len += i;
// terminate it
wb->buffer[wb->len] = '\0';
buffer_overflow_check(wb);
}
// generate a date, the fastest possible way...
void buffer_date(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)
{
// 10 20 30 = 35
// 01234567890123456789012345678901234
// 2014-04-01 03:28:20
buffer_need_bytes(wb, 36);
char *b = &wb->buffer[wb->len];
int i = 0;
b[i++]= (char) (48 + year / 1000); year -= (year / 1000) * 1000;
b[i++]= (char) (48 + year / 100); year -= (year / 100) * 100;
b[i++]= (char) (48 + year / 10);
b[i++]= (char) (48 + year % 10);
b[i++]='-';
b[i++]= (char) (48 + month / 10);
b[i++]= (char) (48 + month % 10);
b[i++]='-';
b[i++]= (char) (48 + day / 10);
b[i++]= (char) (48 + day % 10);
b[i++]=' ';
b[i++]= (char) (48 + hours / 10);
b[i++]= (char) (48 + hours % 10);
b[i++]=':';
b[i++]= (char) (48 + minutes / 10);
b[i++]= (char) (48 + minutes % 10);
b[i++]=':';
b[i++]= (char) (48 + seconds / 10);
b[i++]= (char) (48 + seconds % 10);
b[i]='\0';
wb->len += i;
// terminate it
wb->buffer[wb->len] = '\0';
buffer_overflow_check(wb);
}
BUFFER *buffer_create(long size)
{
BUFFER *b;
debug(D_WEB_BUFFER, "Creating new web buffer of size %d.", size);
b = calloc(1, sizeof(BUFFER));
if(!b) {
error("Cannot allocate a web_buffer.");
return NULL;
}
b->buffer = malloc(size + sizeof(BUFFER_OVERFLOW_EOF) + 2);
if(!b->buffer) {
error("Cannot allocate a buffer of size %u.", size + sizeof(BUFFER_OVERFLOW_EOF) + 2);
free(b);
return NULL;
}
b->buffer[0] = '\0';
b->size = size;
b->contenttype = CT_TEXT_PLAIN;
buffer_overflow_init(b);
buffer_overflow_check(b);
return(b);
}
void buffer_free(BUFFER *b)
{
buffer_overflow_check(b);
debug(D_WEB_BUFFER, "Freeing web buffer of size %d.", b->size);
if(b->buffer) free(b->buffer);
free(b);
}
void buffer_increase(BUFFER *b, size_t free_size_required)
{
buffer_overflow_check(b);
size_t left = b->size - b->len;
if(left >= free_size_required) return;
size_t increase = free_size_required - left;
if(increase < WEB_DATA_LENGTH_INCREASE_STEP) increase = WEB_DATA_LENGTH_INCREASE_STEP;
debug(D_WEB_BUFFER, "Increasing data buffer from size %d to %d.", b->size, b->size + increase);
b->buffer = realloc(b->buffer, b->size + increase + sizeof(BUFFER_OVERFLOW_EOF) + 2);
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);
b->size += increase;
buffer_overflow_init(b);
buffer_overflow_check(b);
}
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