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/*
__ __ _
___\ \/ /_ __ __ _| |_
/ _ \\ /| '_ \ / _` | __|
| __// \| |_) | (_| | |_
\___/_/\_\ .__/ \__,_|\__|
|_| XML parser
Copyright (c) 1997-2000 Thai Open Source Software Center Ltd
Copyright (c) 2000-2017 Expat development team
Licensed under the MIT license:
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to permit
persons to whom the Software is furnished to do so, subject to the
following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#define CHARSET_MAX 41
static const char *
getTok(const char **pp) {
enum { inAtom, inString, init, inComment };
int state = init;
const char *tokStart = 0;
for (;;) {
switch (**pp) {
case '\0':
return 0;
case ' ':
case '\r':
case '\t':
case '\n':
if (state == inAtom)
return tokStart;
break;
case '(':
if (state == inAtom)
return tokStart;
if (state != inString)
state++;
break;
case ')':
if (state > init)
--state;
else if (state != inString)
return 0;
break;
case ';':
case '/':
case '=':
if (state == inAtom)
return tokStart;
if (state == init)
return (*pp)++;
break;
case '\\':
++*pp;
if (**pp == '\0')
return 0;
break;
case '"':
switch (state) {
case inString:
++*pp;
return tokStart;
case inAtom:
return tokStart;
case init:
tokStart = *pp;
state = inString;
break;
}
break;
default:
if (state == init) {
tokStart = *pp;
state = inAtom;
}
break;
}
++*pp;
}
/* not reached */
}
/* key must be lowercase ASCII */
static int
matchkey(const char *start, const char *end, const char *key) {
if (! start)
return 0;
for (; start != end; start++, key++)
if (*start != *key && *start != 'A' + (*key - 'a'))
return 0;
return *key == '\0';
}
void
getXMLCharset(const char *buf, char *charset) {
const char *next, *p;
charset[0] = '\0';
next = buf;
p = getTok(&next);
if (matchkey(p, next, "text"))
strcpy(charset, "us-ascii");
else if (! matchkey(p, next, "application"))
return;
p = getTok(&next);
if (! p || *p != '/')
return;
p = getTok(&next);
if (matchkey(p, next, "xml"))
isXml = 1;
p = getTok(&next);
while (p) {
if (*p == ';') {
p = getTok(&next);
if (matchkey(p, next, "charset")) {
p = getTok(&next);
if (p && *p == '=') {
p = getTok(&next);
if (p) {
char *s = charset;
if (*p == '"') {
while (++p != next - 1) {
if (*p == '\\')
++p;
if (s == charset + CHARSET_MAX - 1) {
charset[0] = '\0';
break;
}
*s++ = *p;
}
*s++ = '\0';
} else {
if (next - p > CHARSET_MAX - 1)
break;
while (p != next)
*s++ = *p++;
*s = 0;
break;
}
}
}
}
} else
p = getTok(&next);
}
}
int
main(int argc, char **argv) {
char buf[CHARSET_MAX];
getXMLCharset(argv[1], buf);
printf("charset = \"%s\"\n", buf);
return 0;
}
|
