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72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
#include "fmt.h"
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#ifdef UNITTEST
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#undef UNITTEST
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#include "fmt_tohex.c"
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#define UNITTEST
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#endif
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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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#ifdef UNITTEST
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#include <assert.h>
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#include <string.h>
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int main() {
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char buf[100];
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assert(fmt_escapecharjson(buf,'f')==6 && !memcmp(buf,"\\u0066",6));
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assert(fmt_escapecharjson(buf,'\b')==2 && !memcmp(buf,"\\b",2));
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assert(fmt_escapecharjson(buf,'\n')==2 && !memcmp(buf,"\\n",2));
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assert(fmt_escapecharjson(buf,'\r')==2 && !memcmp(buf,"\\r",2));
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assert(fmt_escapecharjson(buf,'"')==2 && !memcmp(buf,"\\\"",2));
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assert(fmt_escapecharjson(buf,'\\')==2 && !memcmp(buf,"\\\\",2));
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assert(fmt_escapecharjson(buf,'/')==2 && !memcmp(buf,"\\/",2)); /* I'm baffled as well */
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assert(fmt_escapecharjson(buf,0x1d11e)==12 && !memcmp(buf,"\\ud834\\udd1e",12)); /* utf-16 surrogate pairs */
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return 0;
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}
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#endif
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