#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "jansson_private.h"
#include "strbuffer.h"
/* need config.h to get the correct snprintf */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#if JSON_HAVE_LOCALECONV
#include <locale.h>
/*
- This code assumes that the decimal separator is exactly one
character.
- If setlocale() is called by another thread between the call to
localeconv() and the call to sprintf() or strtod(), the result may
be wrong. setlocale() is not thread-safe and should not be used
this way. Multi-threaded programs should use uselocale() instead.
*/
static void to_locale(strbuffer_t *strbuffer)
{
const char *point;
char *pos;
point = localeconv()->decimal_point;
if(*point == '.') {
/* No conversion needed */
return;
}
pos = strchr(strbuffer->value, '.');
if(pos)
*pos = *point;
}
static void from_locale(char *buffer)
{
const char *point;
char *pos;
point = localeconv()->decimal_point;
if(*point == '.') {
/* No conversion needed */
return;
}
pos = strchr(buffer, *point);
if(pos)
*pos = '.';
}
#endif
int jsonp_strtod(strbuffer_t *strbuffer, double *out)
{
double value;
char *end;
#if JSON_HAVE_LOCALECONV
to_locale(strbuffer);
#endif
errno = 0;
value = strtod(strbuffer->value, &end);
assert(end == strbuffer->value + strbuffer->length);
if(errno == ERANGE && value != 0) {
/* Overflow */
return -1;
}
*out = value;
return 0;
}
int jsonp_dtostr(char *buffer, size_t size, double value)
{
int ret;
char *start, *end;
size_t length;
ret = snprintf(buffer, size, "%.17g", value);
if(ret < 0)
return -1;
length = (size_t)ret;
if(length >= size)
return -1;
#if JSON_HAVE_LOCALECONV
from_locale(buffer);
#endif
/* Make sure there's a dot or 'e' in the output. Otherwise
a real is converted to an integer when decoding */
if(strchr(buffer, '.') == NULL &&
strchr(buffer, 'e') == NULL)
{
if(length + 3 >= size) {
/* No space to append ".0" */
return -1;
}
buffer[length] = '.';
buffer[length + 1] = '0';
buffer[length + 2] = '\0';
length += 2;
}
/* Remove leading '+' from positive exponent. Also remove leading
zeros from exponents (added by some printf() implementations) */
start = strchr(buffer, 'e');
if(start) {
start++;
end = start + 1;
if(*start == '-')
start++;
while(*end == '0')
end++;
if(end != start) {
memmove(start, end, length - (size_t)(end - buffer));
length -= (size_t)(end - start);
}
}
return (int)length;
}
