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rework cJSONUtils_GetPointer to avoid malloc/free by using strcmp with pointer-encoding awareness. 

git-svn-id: svn://svn.code.sf.net/p/cjson/code@64 e3330c51-1366-4df0-8b21-3ccf24e3d50e
This commit is contained in:
Dave Gamble 2015-02-10 12:14:59 +00:00
parent c0f5e2056b
commit 858671cc7f
1 changed files with 17 additions and 21 deletions
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38
cJSON_Utils.c
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@ -1,39 +1,35 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "cJSON_Utils.h"
static int cJSONUtils_Pstrcasecmp(const char *a,const char *e)
{
if (!a || !e) return (a==e)?0:1;
for (;*a && *e && *e!='/';a++,e++) {
if (*e=='~') {if (!(e[1]=='0' && *a=='~') && !(e[1]=='1' && *a=='/')) return 1; else e++;}
else if (tolower(*a)!=tolower(*e)) return 1;
}
if ((*e!=0 && *e!='/') != (*a!=0)) return 1;
return 0;
}
cJSON *cJSONUtils_GetPointer(cJSON *object,const char *pointer)
{
cJSON *target=object;int which=0;const char *s=0;int len=0;char *element=0,*e=0;
cJSON *target=object;int which=0;const char *element=0;
while (*pointer=='/' && object)
{
pointer++;
if (object->type==cJSON_Array)
{
which=0;
while (*pointer>='0' && *pointer<='9') {which*=10;which+=*pointer++ - '0';}
which=0; while (*pointer>='0' && *pointer<='9') which=(10*which) + *pointer++ - '0';
if (*pointer && *pointer!='/') return 0;
object=cJSON_GetArrayItem(object,which);
}
else if (object->type==cJSON_Object)
{
s=pointer;len=0;
while (*s && *s!='/') {if (*s!='~') len++; s++;}
e=element=malloc(len+1); if (!element) return 0;
element[len]=0;
while (*pointer && *pointer!='/')
{
if (*pointer=='~' && pointer[1]=='0') *e++='~',pointer+=2;
else if (*pointer=='~' && pointer[1]=='1') *e++='/',pointer+=2;
else if (*pointer=='~') {free(element); return 0;} // Invalid encoding.
else *e++=*pointer++;
}
object=cJSON_GetObjectItem(object,element);
free(element);
element=pointer; while (*pointer && *pointer!='/') pointer++;
object=object->child; while (object && cJSONUtils_Pstrcasecmp(object->string,element)) object=object->next; // GetObjectItem.
}
else return 0;
}