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1.1 KiB

#include "fmt.h"
size_t fmt_xmlescape(char* dest,uint32_t ch) {
char* x;
size_t n;
/*
From http://en.wikipedia.org/wiki/XML#Valid_characters
Unicode code points in the following ranges are valid in XML 1.0 documents:
U+0009, U+000A, U+000D: these are the only C0 controls accepted in XML 1.0;
U+0020–U+D7FF, U+E000–U+FFFD: this excludes some (not all) non-characters in the BMP (all surrogates, U+FFFE and U+FFFF are forbidden);
U+10000–U+10FFFF: this includes all code points in supplementary planes, including non-characters.
*/
if (ch==0 || (ch>=0xd780 && ch<=0xdfff) || ch==0xfffe || ch==0xffff || ch>0x10ffff) return 0;
if ((ch&0x7f)<20 && ch!=9 && ch!=0xa && ch!=0xd && ch!=0x85) {
char buf[6];
buf[0]='&';
buf[1]='#';
buf[2]='x';
n=3+fmt_xlong(buf+3,ch);
buf[n++]=';';
x=buf;
} else
switch (ch) {
case '&':
x="&amp;"; n=5;
break;
case '<':
x="&lt;"; n=4;
break;
default:
return fmt_utf8(dest,ch);
}
if (dest) {
size_t i;
for (i=0; i<n; ++i)
dest[i]=x[i];
}
return n;
}