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better handling of ASCII control chars in xml

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represent ASCII control chars as their unicode glyphs in XML

see http://www.shacknews.com/chatty?id=37738911#item_37738911
This commit is contained in:
John Cupitt 2018-07-23 18:21:15 +01:00
parent 19b27c846e
commit 479610ff30
1 changed files with 6 additions and 7 deletions
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13
libvips/iofuncs/vips.c
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@ -782,15 +782,14 @@ dbuf_write_amp( VipsDbuf *dbuf, const char *str )
for( p = str; *p; p++ )
if( *p < 32 )
/* You'd think we could output "&#x02%x;", but xml
* 1.0 parsers barf on that. Perhaps we should use '?',
* but this is frankly better.
* 1.0 parsers barf on that. xml 1.1 allows this, but
* there are almost no parsers.
*
* xml 1.1 allows this, but expat does not support
* it.
*
* vips_dbuf_writef( dbuf, "&#x%02x;", *p );
* U+2400 onwards are unicode glyphs for the ASCII
* control characters, so we can use them -- thanks
* electroly.
*/
vips_dbuf_write( dbuf, (guchar *) "&#128004;", 9 );
vips_dbuf_writef( dbuf, "&#x%04x;", 0x2400 + *p );
else if( *p == '<' )
vips_dbuf_write( dbuf, (guchar *) "&lt;", 4 );
else if( *p == '>' )