Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#include "fmt.h"
static void fmt_hex4(char* dest,uint16_t w) {
dest[3]=fmt_tohex(w&0xf); w>>=4;
dest[2]=fmt_tohex(w&0xf); w>>=4;
dest[1]=fmt_tohex(w&0xf); w>>=4;
dest[0]=fmt_tohex(w&0xf);
}
size_t fmt_escapecharjson(char* dest,uint32_t ch) {
size_t n;
switch (ch) {
case '\b':
ch='b'; goto simple;
case '\n':
ch='n'; goto simple;
case '\r':
ch='r'; goto simple;
case '"':
case '\\':
case '/':
simple:
if (dest) {
dest[0]='\\';
dest[1]=(char)ch;
}
return 2;
}
if (ch>0xffff) {
if (ch>0x10ffff) return 0; // highest representable unicode codepoint
if (dest) {
dest[0]='\\';
dest[1]='u';
fmt_hex4(dest+2,(uint16_t)(0xd800 | (((ch-0x10000)>>10)&0x3ff)));
dest+=6;
}
ch=(ch&0x3ff)|0xdc00;
n=6;
} else
n=0;
if (dest) {
dest[0]='\\';
dest[1]='u';
fmt_hex4(dest+2,(uint16_t)ch);
}
return n+6;
}