netdata/src/web_buffer.c at master · bosencoding/netdata · GitHub

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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 %zu is above size %zu, 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, 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, 1);

char *s = &wb->buffer[wb->len], *start, *end = &wb->buffer[wb->size];

long len = wb->len;

start = s;

while(*txt && s != end)

*s++ = *txt++;

len += s - start;

wb->len = len;

buffer_overflow_check(wb);

if(*txt) {

debug(D_WEB_BUFFER, "strcat(): increasing web_buffer at position %zu, size = %zu\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 += vsnprintfz(&wb->buffer[wb->len], len, fmt, args);

va_end(args);

buffer_overflow_check(wb);

// the buffer is \0 terminated by vsnprintfz

}

void buffer_vsprintf(BUFFER *wb, const char *fmt, va_list args)

{

if(unlikely(!fmt || !*fmt)) return;

buffer_need_bytes(wb, 2);

size_t len = wb->size - wb->len - 1;

wb->len += vsnprintfz(&wb->buffer[wb->len], len, fmt, args);

buffer_overflow_check(wb);

// the buffer is \0 terminated by vsnprintfz

}

void buffer_sprintf(BUFFER *wb, const char *fmt, ...)

{

if(unlikely(!fmt || !*fmt)) return;

buffer_need_bytes(wb, 2);

size_t len = wb->size - wb->len - 1;

size_t wrote;

va_list args;

va_start(args, fmt);

wrote = (size_t) vsnprintfz(&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 %zu, size = %zu\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], *p;

unsigned int *q = (unsigned int *)b;

#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__

*q++ = 0x65746144; // "Date" backwards.

#else

*q++ = 0x44617465; // "Date"

#endif

p = (char *)q;

*p++ = '(';

*p++ = '0' + year / 1000; year %= 1000;

*p++ = '0' + year / 100; year %= 100;

*p++ = '0' + year / 10;

*p++ = '0' + year % 10;

*p++ = ',';

*p = '0' + month / 10; if (*p != '0') p++;

*p++ = '0' + month % 10;

*p++ = ',';

*p = '0' + day / 10; if (*p != '0') p++;

*p++ = '0' + day % 10;

*p++ = ',';

*p = '0' + hours / 10; if (*p != '0') p++;

*p++ = '0' + hours % 10;

*p++ = ',';

*p = '0' + minutes / 10; if (*p != '0') p++;

*p++ = '0' + minutes % 10;

*p++ = ',';

*p = '0' + seconds / 10; if (*p != '0') p++;

*p++ = '0' + seconds % 10;

unsigned short *r = (unsigned short *)p;

#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__

*r++ = 0x0029; // ")\0" backwards.

#else

*r++ = 0x2900; // ")\0"

#endif

wb->len += (size_t)((char *)r - b - 1);

// 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];

char *p = b;

*p++ = '0' + year / 1000; year %= 1000;

*p++ = '0' + year / 100; year %= 100;

*p++ = '0' + year / 10;

*p++ = '0' + year % 10;

*p++ = '-';

*p++ = '0' + month / 10;

*p++ = '0' + month % 10;

*p++ = '-';

*p++ = '0' + day / 10;

*p++ = '0' + day % 10;

*p++ = ' ';

*p++ = '0' + hours / 10;

*p++ = '0' + hours % 10;

*p++ = ':';

*p++ = '0' + minutes / 10;

*p++ = '0' + minutes % 10;

*p++ = ':';

*p++ = '0' + seconds / 10;

*p++ = '0' + seconds % 10;

*p = '\0';

wb->len += (size_t)(p - b);

// terminate it

wb->buffer[wb->len] = '\0';

buffer_overflow_check(wb);

}

BUFFER *buffer_create(size_t size)

{

BUFFER *b;

debug(D_WEB_BUFFER, "Creating new web buffer of size %zu.", 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 %zu.", 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 %zu.", b->size);

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 %zu to %zu.", 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 %zu to %zu.",

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);

}

netdata/src/web_buffer.c at master · bosencoding/netdata · GitHub

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