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commit 8262579564087b850fd05ed2fb72bfbdd7c9982a
parent 77606ed0b26aa364dd53b1b9689ff3fd8f0489f3
Author: Hiltjo Posthuma <hiltjo@codemadness.org>
Date:   Wed, 22 Aug 2018 16:08:01 +0200

xml: improve parsing of invalid attribute values separated by whitespace

It is invalid XML, but this allows parsing old HTML pages aswell.

For example:

<input id=cb checked type="checkbox" title='checkbox' />

or

<FONT FACE=wingdings SIZE=12><BLINK>oh hai</BLINK></FONT>

Diffstat:
Mxml.c | 34++++++++++++++++++++++------------
1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/xml.c b/xml.c @@ -14,19 +14,20 @@ static void xml_parseattrs(XMLParser *x) { size_t namelen = 0, valuelen; - int c, endsep, endname = 0; + int c, endsep, endname = 0, valuestart = 0; while ((c = x->getnext()) != EOF) { - if (isspace(c)) { /* TODO: simplify endname ? */ + if (isspace(c)) { if (namelen) endname = 1; continue; - } - if (c == '?') + } else if (c == '?') ; /* ignore */ else if (c == '=') { x->name[namelen] = '\0'; - } else if (namelen && ((endname && isalpha(c)) || (c == '>' || c == '/'))) { + valuestart = 1; + endname = 1; + } else if (namelen && ((endname && !valuestart && isalpha(c)) || (c == '>' || c == '/'))) { /* attribute without value */ x->name[namelen] = '\0'; if (x->xmlattrstart) @@ -38,12 +39,21 @@ xml_parseattrs(XMLParser *x) endname = 0; x->name[0] = c; namelen = 1; - } else if (namelen && (c == '\'' || c == '"')) { + } else if (namelen && valuestart) { /* attribute with value */ - endsep = c; /* c is end separator */ if (x->xmlattrstart) x->xmlattrstart(x, x->tag, x->taglen, x->name, namelen); - for (valuelen = 0; (c = x->getnext()) != EOF;) { + + valuelen = 0; + if (c == '\'' || c == '"') { + endsep = c; + } else { + endsep = ' '; /* isspace() */ + goto startvalue; + } + + while ((c = x->getnext()) != EOF) { +startvalue: if (c == '&') { /* entities */ x->data[valuelen] = '\0'; /* call data function with data before entity if there is data */ @@ -52,7 +62,7 @@ xml_parseattrs(XMLParser *x) x->data[0] = c; valuelen = 1; while ((c = x->getnext()) != EOF) { - if (c == endsep) + if (c == endsep || (endsep == ' ' && (c == '>' || isspace(c)))) break; if (valuelen < sizeof(x->data) - 1) x->data[valuelen++] = c; @@ -73,7 +83,7 @@ xml_parseattrs(XMLParser *x) break; } } - } else if (c != endsep) { + } else if (c != endsep && !(endsep == ' ' && (c == '>' || isspace(c)))) { if (valuelen < sizeof(x->data) - 1) { x->data[valuelen++] = c; } else { @@ -84,7 +94,7 @@ xml_parseattrs(XMLParser *x) valuelen = 1; } } - if (c == endsep) { + if (c == endsep || (endsep == ' ' && (c == '>' || isspace(c)))) { x->data[valuelen] = '\0'; if (x->xmlattr) x->xmlattr(x, x->tag, x->taglen, x->name, namelen, x->data, valuelen); @@ -93,7 +103,7 @@ xml_parseattrs(XMLParser *x) break; } } - namelen = endname = 0; + namelen = endname = valuestart = 0; } else if (namelen < sizeof(x->name) - 1) { x->name[namelen++] = c; }