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reformatting: print_string_ptr

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This commit is contained in:
Max Bruckner 2016-09-28 23:17:34 +07:00
parent c88d045888
commit c71cd6cc1c
1 changed files with 140 additions and 53 deletions
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173
cJSON.c
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@ -615,63 +615,150 @@ static const char *parse_string(cJSON *item, const char *str, const char **ep)
}
/* Render the cstring provided to an escaped version that can be printed. */
static char *print_string_ptr(const char *str,printbuffer *p)
static char *print_string_ptr(const char *str, printbuffer *p)
{
const char *ptr;char *ptr2,*out;int len=0,flag=0;unsigned char token;
const char *ptr;
char *ptr2;
char *out;
int len = 0;
int flag = 0;
unsigned char token;
/* empty string */
if (!str)
{
if (p) out=ensure(p,3);
else out=(char*)cJSON_malloc(3);
if (!out) return 0;
strcpy(out,"\"\"");
return out;
}
for (ptr=str;*ptr;ptr++) flag|=((*ptr>0 && *ptr<32)||(*ptr=='\"')||(*ptr=='\\'))?1:0;
if (!flag)
if (p)
{
len=ptr-str;
if (p) out=ensure(p,len+3);
else out=(char*)cJSON_malloc(len+3);
if (!out) return 0;
ptr2=out;*ptr2++='\"';
strcpy(ptr2,str);
ptr2[len]='\"';
ptr2[len+1]=0;
return out;
out = ensure(p, 3);
}
ptr=str;while ((token=*ptr) && ++len) {if (strchr("\"\\\b\f\n\r\t",token)) len++; else if (token<32) len+=5;ptr++;}
if (p) out=ensure(p,len+3);
else out=(char*)cJSON_malloc(len+3);
if (!out) return 0;
ptr2=out;ptr=str;
*ptr2++='\"';
while (*ptr)
{
if ((unsigned char)*ptr>31 && *ptr!='\"' && *ptr!='\\') *ptr2++=*ptr++;
else
{
*ptr2++='\\';
switch (token=*ptr++)
out = (char*)cJSON_malloc(3);
}
if (!out)
{
case '\\': *ptr2++='\\'; break;
case '\"': *ptr2++='\"'; break;
case '\b': *ptr2++='b'; break;
case '\f': *ptr2++='f'; break;
case '\n': *ptr2++='n'; break;
case '\r': *ptr2++='r'; break;
case '\t': *ptr2++='t'; break;
default: sprintf(ptr2,"u%04x",token);ptr2+=5; break; /* escape and print */
return 0;
}
strcpy(out, "\"\"");
return out;
}
/* set "flag" to 1 if something needs to be escaped */
for (ptr = str; *ptr; ptr++)
{
flag |= (((*ptr > 0) && (*ptr < 32)) /* unprintable characters */
|| (*ptr == '\"') /* double quote */
|| (*ptr == '\\')) /* backslash */
? 1
: 0;
}
/* no characters have to be escaped */
if (!flag)
{
len = ptr - str;
if (p)
{
out = ensure(p, len + 3);
}
else
{
out = (char*)cJSON_malloc(len + 3);
}
if (!out)
{
return 0;
}
ptr2 = out;
*ptr2++ = '\"';
strcpy(ptr2, str);
ptr2[len] = '\"';
ptr2[len + 1] = '\0';
return out;
}
ptr = str;
/* calculate additional space that is needed for escaping */
while ((token = *ptr) && ++len)
{
if (strchr("\"\\\b\f\n\r\t", token))
{
len++; /* +1 for the backslash */
}
else if (token < 32)
{
len += 5; /* +5 for \uXXXX */
}
ptr++;
}
if (p)
{
out = ensure(p, len + 3);
}
else
{
out = (char*)cJSON_malloc(len + 3);
}
if (!out)
{
return 0;
}
ptr2 = out;
ptr = str;
*ptr2++ = '\"';
/* copy the string */
while (*ptr)
{
if (((unsigned char)*ptr > 31) && (*ptr != '\"') && (*ptr != '\\'))
{
/* normal character, copy */
*ptr2++ = *ptr++;
}
else
{
/* character needs to be escaped */
*ptr2++ = '\\';
switch (token = *ptr++)
{
case '\\':
*ptr2++ = '\\';
break;
case '\"':
*ptr2++ = '\"';
break;
case '\b':
*ptr2++ = 'b';
break;
case '\f':
*ptr2++ = 'f';
break;
case '\n':
*ptr2++ = 'n';
break;
case '\r':
*ptr2++ = 'r';
break;
case '\t':
*ptr2++ = 't';
break;
default:
/* escape and print as unicode codepoint */
sprintf(ptr2, "u%04x", token);
ptr2 += 5;
break;
}
}
}
*ptr2++='\"';*ptr2++=0;
*ptr2++ = '\"';
*ptr2++ = '\0';
return out;
}
/* Invote print_string_ptr (which is useful) on an item. */
static char *print_string(cJSON *item,printbuffer *p) {return print_string_ptr(item->valuestring,p);}