[c] Replaced call to locale dependent strtof with customer float parser. Closes #1009

spine-c/spine-c/src/spine/Json.c

@@ -92,29 +92,65 @@ void Json_dispose (Json *c) {
 
 /* Parse the input text to generate a number, and populate the result into item. */
 static const char* parse_number (Json *item, const char* num) {
-	char * endptr;
-	float n;
-
-	/* Using strtod and strtof is slightly more permissive than RFC4627,
-	 * accepting for example hex-encoded floating point, but either
-	 * is often leagues faster than any manual implementation.
-	 *
-	 * We also already know that this starts with [-0-9] from parse_value.
-	 */
-#if __STDC_VERSION__ >= 199901L
-	n = strtof(num, &endptr);
-#else
-	n = (float)strtod( num, &endptr );
-#endif
-	/* ignore errno's ERANGE, which returns +/-HUGE_VAL */
-	/* n is 0 on any other error */
+	double result = 0.0;
+	int negative = 0;
+	char* ptr = (char*)num;
+
+	if (*ptr == '-') {
+		negative = -1;
+		++ptr;
+	}
+
+	while (*ptr >= '0' && *ptr <= '9') {
+		result = result * 10.0 + (*ptr - '0');
+		++ptr;
+	}
+
+	if (*ptr == '.') {
+		double fraction = 0.0;
+		int n = 0;
+		++ptr;
+
+		while (*ptr >= '0' && *ptr <= '9') {
+			fraction = (fraction * 10.0) + (*ptr - '0');
+			++ptr;
+			++n;
+		}
+		result += fraction / POW(10.0, n);
+	}
+	if (negative) result = -result;
+
+	if (*ptr == 'e' || *ptr == 'E') {
+		double exponent = 0;
+		int expNegative = 0;
+		int n = 0;
+		++ptr;
+
+		if (*ptr == '-') {
+			expNegative = -1;
+			++ptr;
+		} else if (*ptr == '+') {
+			++ptr;
+		}
+
+		while (*ptr >= '0' && *ptr <= '9') {
+			exponent = (exponent * 10.0) + (*ptr - '0');
+			++ptr;
+			++n;
+		}
+
+		if (expNegative)
+			result = result / POW(10, exponent);
+		else
+			result = result * POW(10, exponent);
+	}
 
-	if (endptr != num) {
+	if (ptr != num) {
 		/* Parse success, number found. */
-		item->valueFloat = n;
-		item->valueInt = (int)n;
+		item->valueFloat = result;
+		item->valueInt = (int)result;
 		item->type = Json_Number;
-		return endptr;
+		return ptr;
 	} else {
 		/* Parse failure, ep is set. */
 		ep = num;

spine-c/spine-c/src/spine/SkeletonJson.c

@@ -30,7 +30,6 @@
 
 #include <spine/SkeletonJson.h>
 #include <stdio.h>
-#include <locale.h>
 #include "Json.h"
 #include <spine/extension.h>
 #include <spine/AtlasAttachmentLoader.h>
@@ -579,25 +578,14 @@ spSkeletonData* spSkeletonJson_readSkeletonData (spSkeletonJson* self, const cha
 	int i, ii;
 	spSkeletonData* skeletonData;
 	Json *root, *skeleton, *bones, *boneMap, *ik, *transform, *path, *slots, *skins, *animations, *events;
-	char* oldLocale;
 	_spSkeletonJson* internal = SUB_CAST(_spSkeletonJson, self);
 
 	FREE(self->error);
 	CONST_CAST(char*, self->error) = 0;
 	internal->linkedMeshCount = 0;
 
-#ifndef __ANDROID__
-	oldLocale = strdup(setlocale(LC_NUMERIC, NULL));
-	setlocale(LC_NUMERIC, "C");
-#endif
-
 	root = Json_create(json);
 
-#ifndef __ANDROID__
-	setlocale(LC_NUMERIC, oldLocale);
-	free(oldLocale);
-#endif
-
 	if (!root) {
 		_spSkeletonJson_setError(self, 0, "Invalid skeleton JSON: ", Json_getError());
 		return 0;