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#include "fmt.h"
/* This is NOT fmt_escapexml, which will escape everything, whether it
* needs escaping or not. This will only escape what needs escaping, and
* reject invalid inputs */
size_t fmt_xmlescape(char* dest,uint32_t ch) {
char* x;
char buf[6];
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<0x20 && ch!=9 && ch!=0xa && ch!=0xd) {
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;
}
#ifdef UNITTEST
#undef UNITTEST
#include "fmt_utf8.c"
#include "fmt_xlong.c"
#include <assert.h>
#include <string.h>
int main() {
char buf[100];
buf[0]=0x78;
assert(fmt_xmlescape(buf,0) == 0 && buf[0]==0x78); // 0 not allowed
assert(fmt_xmlescape(buf,0xd800) == 0 && buf[0]==0x78); // surrogate pairs not allowed
assert(fmt_xmlescape(buf,0xdfff) == 0 && buf[0]==0x78); // surrogate pairs not allowed
assert(fmt_xmlescape(buf,0xfffe) == 0 && buf[0]==0x78); // 0xfffe and 0xffff forbidden
assert(fmt_xmlescape(buf,0xffff) == 0 && buf[0]==0x78);
assert(fmt_xmlescape(buf,0x110000) == 0 && buf[0]==0x78); // too large
buf[1]=0x79;
assert(fmt_xmlescape(buf,9) == 1 && buf[0]==9 && buf[1]==0x79); // \t OK
assert(fmt_xmlescape(buf,10) == 1 && buf[0]==10 && buf[1]==0x79); // \n OK
assert(fmt_xmlescape(buf,13) == 1 && buf[0]==13 && buf[1]==0x79); // \r OK
buf[5]=0x77;
assert(fmt_xmlescape(buf,14) == 5 && !memcmp(buf,"&#xe;\x77",6)); // other control chars not OK
assert(fmt_xmlescape(buf,'&') == 5 && !memcmp(buf,"&amp;\x77",6)); // & -> &amp;
assert(fmt_xmlescape(buf,'<') == 4 && !memcmp(buf,"&lt;;\x77",6)); // < -> &lt;
}
#endif