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optimises for number/string print

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git-svn-id: svn://svn.code.sf.net/p/cjson/code@59 e3330c51-1366-4df0-8b21-3ccf24e3d50e
This commit is contained in:
Dave Gamble 2015-02-09 17:25:55 +00:00
parent 28691956a6
commit 575724a15f
1 changed files with 34 additions and 2 deletions
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36
cJSON.c
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@ -122,7 +122,16 @@ static char *print_number(cJSON *item)
if (fabs(((double)item->valueint)-d)<=DBL_EPSILON && d<=INT_MAX && d>=INT_MIN)
{
str=(char*)cJSON_malloc(21); /* 2^64+1 can be represented in 21 chars. */
if (str) sprintf(str,"%d",item->valueint);
if (str)
{
int i,j,t;
if (d<0) t=-d; else t=d;
for (i=0;t>0;t/=10) str[i++]='0'+(t%10);
if (d<0) str[i++]='-';
str[i--]=0;
for (j=0;j<i;i--,j++) {t=str[j];str[j]=str[i];str[i]=t;} // reverse the string.
}
}
else
{
@ -211,10 +220,33 @@ static const char *parse_string(cJSON *item,const char *str)
return ptr;
}
static int escapable[256]={ 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1,
0,0,1,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 1,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0};
/* Render the cstring provided to an escaped version that can be printed. */
static char *print_string_ptr(const char *str)
{
const char *ptr;char *ptr2,*out;int len=0;unsigned char token;
const char *ptr;char *ptr2,*out;int len=0,flag=0;unsigned char token;
ptr=str;while (*ptr) flag|=escapable[*ptr++];
if (!flag)
{
len=ptr-str;
out=(char*)cJSON_malloc(len+3);
if (!out) return 0;
ptr2=out;*ptr2++='\"';
strcpy(ptr2,str);
ptr2[len]='\"';
ptr2[len+1]=0;
return out;
}
if (!str) return cJSON_strdup("");
ptr=str;while ((token=*ptr) && ++len) {if (strchr("\"\\\b\f\n\r\t",token)) len++; else if (token<32) len+=5;ptr++;}