mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2025-11-01 00:46:39 +08:00
140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#ifdef __MINGW32__
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#undef __NO_ISOCEXT /* ensure stdlib.h will declare prototypes for mingw own 'strtod' replacement, called '__strtod' */
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#endif
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#include "jansson_private.h"
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#include "strbuffer.h"
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/* need jansson_private_config.h to get the correct snprintf */
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#ifdef HAVE_CONFIG_H
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#include <jansson_private_config.h>
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#endif
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#ifdef __MINGW32__
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#define strtod __strtod
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#endif
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#if JSON_HAVE_LOCALECONV
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#include <locale.h>
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/*
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- This code assumes that the decimal separator is exactly one
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character.
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- If setlocale() is called by another thread between the call to
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localeconv() and the call to sprintf() or strtod(), the result may
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be wrong. setlocale() is not thread-safe and should not be used
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this way. Multi-threaded programs should use uselocale() instead.
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*/
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static void to_locale(strbuffer_t *strbuffer) {
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const char *point;
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char *pos;
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point = localeconv()->decimal_point;
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if (*point == '.') {
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/* No conversion needed */
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return;
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}
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pos = strchr(strbuffer->value, '.');
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if (pos)
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*pos = *point;
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}
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static void from_locale(char *buffer) {
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const char *point;
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char *pos;
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point = localeconv()->decimal_point;
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if (*point == '.') {
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/* No conversion needed */
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return;
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}
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pos = strchr(buffer, *point);
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if (pos)
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*pos = '.';
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}
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#endif
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int jsonp_strtod(strbuffer_t *strbuffer, double *out) {
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double value;
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char *end;
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#if JSON_HAVE_LOCALECONV
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to_locale(strbuffer);
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#endif
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errno = 0;
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value = strtod(strbuffer->value, &end);
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assert(end == strbuffer->value + strbuffer->length);
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if ((value == HUGE_VAL || value == -HUGE_VAL) && errno == ERANGE) {
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/* Overflow */
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return -1;
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}
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*out = value;
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return 0;
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}
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int jsonp_dtostr(char *buffer, size_t size, double value, int precision) {
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int ret;
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char *start, *end;
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size_t length;
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if (precision == 0)
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precision = 17;
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ret = snprintf(buffer, size, "%.*g", precision, value);
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if (ret < 0)
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return -1;
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length = (size_t)ret;
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if (length >= size)
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return -1;
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#if JSON_HAVE_LOCALECONV
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from_locale(buffer);
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#endif
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/* Make sure there's a dot or 'e' in the output. Otherwise
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a real is converted to an integer when decoding */
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if (strchr(buffer, '.') == NULL &&
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strchr(buffer, 'e') == NULL) {
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if (length + 3 >= size) {
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/* No space to append ".0" */
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return -1;
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}
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buffer[length] = '.';
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buffer[length + 1] = '0';
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buffer[length + 2] = '\0';
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length += 2;
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}
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/* Remove leading '+' from positive exponent. Also remove leading
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zeros from exponents (added by some printf() implementations) */
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start = strchr(buffer, 'e');
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if (start) {
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start++;
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end = start + 1;
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if (*start == '-')
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start++;
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while (*end == '0')
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end++;
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if (end != start) {
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memmove(start, end, length - (size_t)(end - buffer));
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length -= (size_t)(end - start);
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}
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}
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return (int)length;
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}
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