164 lines
3.1 KiB
C
164 lines
3.1 KiB
C
#include <string.h>
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#include "xmlmime.h"
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static const char *
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getTok(const char **pp)
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{
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/* inComment means one level of nesting; inComment+1 means two levels etc */
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enum { inAtom, inString, init, inComment };
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int state = init;
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const char *tokStart = 0;
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for (;;) {
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switch (**pp) {
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case '\0':
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if (state == inAtom)
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return tokStart;
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return 0;
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case ' ':
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case '\r':
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case '\t':
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case '\n':
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if (state == inAtom)
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return tokStart;
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break;
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case '(':
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if (state == inAtom)
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return tokStart;
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if (state != inString)
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state++;
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break;
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case ')':
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if (state > init)
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--state;
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else if (state != inString)
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return 0;
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break;
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case ';':
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case '/':
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case '=':
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if (state == inAtom)
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return tokStart;
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if (state == init)
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return (*pp)++;
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break;
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case '\\':
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++*pp;
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if (**pp == '\0')
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return 0;
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break;
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case '"':
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switch (state) {
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case inString:
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++*pp;
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return tokStart;
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case inAtom:
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return tokStart;
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case init:
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tokStart = *pp;
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state = inString;
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break;
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}
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break;
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default:
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if (state == init) {
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tokStart = *pp;
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state = inAtom;
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}
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break;
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}
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++*pp;
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}
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/* not reached */
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}
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/* key must be lowercase ASCII */
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static int
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matchkey(const char *start, const char *end, const char *key)
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{
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if (!start)
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return 0;
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for (; start != end; start++, key++)
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if (*start != *key && *start != 'A' + (*key - 'a'))
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return 0;
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return *key == '\0';
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}
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void
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getXMLCharset(const char *buf, char *charset)
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{
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const char *next, *p;
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charset[0] = '\0';
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next = buf;
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p = getTok(&next);
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if (matchkey(p, next, "text"))
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strcpy(charset, "us-ascii");
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else if (!matchkey(p, next, "application"))
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return;
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p = getTok(&next);
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if (!p || *p != '/')
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return;
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p = getTok(&next);
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#if 0
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if (!matchkey(p, next, "xml") && charset[0] == '\0')
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return;
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#endif
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p = getTok(&next);
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while (p) {
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if (*p == ';') {
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p = getTok(&next);
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if (matchkey(p, next, "charset")) {
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p = getTok(&next);
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if (p && *p == '=') {
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p = getTok(&next);
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if (p) {
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char *s = charset;
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if (*p == '"') {
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while (++p != next - 1) {
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if (*p == '\\')
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++p;
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if (s == charset + CHARSET_MAX - 1) {
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charset[0] = '\0';
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break;
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}
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*s++ = *p;
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}
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*s++ = '\0';
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}
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else {
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if (next - p > CHARSET_MAX - 1)
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break;
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while (p != next)
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*s++ = *p++;
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*s = 0;
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break;
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}
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}
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}
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break;
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}
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}
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else
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p = getTok(&next);
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}
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}
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#ifdef TEST
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#include <stdio.h>
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int
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main(int argc, char *argv[])
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{
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char buf[CHARSET_MAX];
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if (argc <= 1)
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return 1;
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printf("%s\n", argv[1]);
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getXMLCharset(argv[1], buf);
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printf("charset=\"%s\"\n", buf);
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return 0;
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}
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#endif /* TEST */
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