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