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reformatting: parse_number

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Max Bruckner 2016-09-27 23:44:13 +07:00
parent 46cfa68a2b
commit 88cbe57ba4
1 changed files with 64 additions and 16 deletions
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80
cJSON.c
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@ -130,25 +130,73 @@ void cJSON_Delete(cJSON *c)
}
/* Parse the input text to generate a number, and populate the result into item. */
static const char *parse_number(cJSON *item,const char *num)
static const char *parse_number(cJSON *item, const char *num)
{
double n=0,sign=1,scale=0;int subscale=0,signsubscale=1;
double n = 0;
double sign = 1;
double scale = 0;
int subscale = 0;
int signsubscale = 1;
if (*num=='-') sign=-1,num++; /* Has sign? */
if (*num=='0') num++; /* is zero */
if (*num>='1' && *num<='9') do n=(n*10.0)+(*num++ -'0'); while (*num>='0' && *num<='9'); /* Number? */
if (*num=='.' && num[1]>='0' && num[1]<='9') {num++; do n=(n*10.0)+(*num++ -'0'),scale--; while (*num>='0' && *num<='9');} /* Fractional part? */
if (*num=='e' || *num=='E') /* Exponent? */
{ num++;if (*num=='+') num++; else if (*num=='-') signsubscale=-1,num++; /* With sign? */
while (*num>='0' && *num<='9') subscale=(subscale*10)+(*num++ - '0'); /* Number? */
}
/* Has sign? */
if (*num == '-')
{
sign = -1;
num++;
}
/* is zero */
if (*num == '0')
{
num++;
}
/* Number? */
if ((*num >= '1') && (*num <= '9'))
{
do
{
n = (n * 10.0) + (*num++ - '0');
}
while ((*num >= '0') && (*num<='9'));
}
/* Fractional part? */
if ((*num == '.') && (num[1] >= '0') && (num[1] <= '9'))
{
num++;
do
{
n = (n *10.0) + (*num++ - '0');
scale--;
} while ((*num >= '0') && (*num <= '9'));
}
/* Exponent? */
if ((*num == 'e') || (*num == 'E'))
{
num++;
/* With sign? */
if (*num == '+')
{
num++;
}
else if (*num == '-')
{
signsubscale = -1;
num++;
}
/* Number? */
while ((*num>='0') && (*num<='9'))
{
subscale = (subscale * 10) + (*num++ - '0');
}
}
n=sign*n*pow(10.0,(scale+subscale*signsubscale)); /* number = +/- number.fraction * 10^+/- exponent */
item->valuedouble=n;
item->valueint=(int)n;
item->type=cJSON_Number;
return num;
/* number = +/- number.fraction * 10^+/- exponent */
n = sign * n * pow(10.0, (scale + subscale * signsubscale));
item->valuedouble = n;
item->valueint = (int)n;
item->type = cJSON_Number;
return num;
}
static int pow2gt (int x) { --x; x|=x>>1; x|=x>>2; x|=x>>4; x|=x>>8; x|=x>>16; return x+1; }