41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
#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="&"; n=5;
|
||
break;
|
||
case '<':
|
||
x="<"; 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;
|
||
}
|