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/*
* $Id: _deHTMLxs.c,v 1.5 2006/02/16 19:16:00 rsoderberg Exp $
*/
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "deHTMLxs.h"
/* Read-only structure, so it's thread-safe */
typedef struct {
char *name;
char chr;
} CM_PREPROC_html_tags_t;
CM_PREPROC_html_tags_t CM_PREPROC_html_tags[] = {
{ "lt" , '<' }, { "gt" , '>' }, { "amp" , '&' },
{ "quot" , '"' }, { "nbsp" , ' ' }, { "iexcl" , (char)161 },
{ "cent" , (char)162 }, { "pound" , (char)163 }, { "curren", (char)164 },
{ "yen" , (char)165 }, { "brvbar", (char)166 }, { "sect" , (char)167 },
{ "uml" , (char)168 }, { "copy" , (char)169 }, { "ordf" , (char)170 },
{ "laquo" , (char)171 }, { "not" , (char)172 }, { "shy" , (char)173 },
{ "reg" , (char)174 }, { "macr" , (char)175 }, { "deg" , (char)176 },
{ "plusmn", (char)177 }, { "sup2" , (char)178 }, { "sup3" , (char)179 },
{ "acute" , (char)180 }, { "micro" , (char)181 }, { "para" , (char)182 },
{ "middot", (char)183 }, { "cedil" , (char)184 }, { "sup1" , (char)185 },
{ "ordm" , (char)186 }, { "raquo" , (char)187 }, { "frac14", (char)188 },
{ "frac12", (char)189 }, { "frac34", (char)190 }, { "iquest", (char)191 },
{ "Agrave", (char)192 }, { "Aacute", (char)193 }, { "Acirc" , (char)194 },
{ "Atilde", (char)195 }, { "Auml" , (char)196 }, { "Aring" , (char)197 },
{ "AElig" , (char)198 }, { "Ccedil", (char)199 }, { "Egrave", (char)200 },
{ "Eacute", (char)201 }, { "Ecirc" , (char)202 }, { "Euml" , (char)203 },
{ "Igrave", (char)204 }, { "Iacute", (char)205 }, { "Icirc" , (char)206 },
{ "Iuml" , (char)207 }, { "ETH" , (char)208 }, { "Ntilde", (char)209 },
{ "Ograve", (char)210 }, { "Oacute", (char)211 }, { "Ocirc" , (char)212 },
{ "Otilde", (char)213 }, { "Ouml" , (char)214 }, { "times" , (char)215 },
{ "Oslash", (char)216 }, { "Ugrave", (char)217 }, { "Uacute", (char)218 },
{ "Ucirc" , (char)219 }, { "Uuml" , (char)220 }, { "Yacute", (char)221 },
{ "THORN" , (char)222 }, { "szlig" , (char)223 }, { "agrave", (char)224 },
{ "aacute", (char)225 }, { "acirc" , (char)226 }, { "atilde", (char)227 },
{ "auml" , (char)228 }, { "aring" , (char)229 }, { "aelig" , (char)230 },
{ "ccedil", (char)231 }, { "egrave", (char)232 }, { "eacute", (char)233 },
{ "ecirc" , (char)234 }, { "euml" , (char)235 }, { "igrave", (char)236 },
{ "iacute", (char)237 }, { "icirc" , (char)238 }, { "iuml" , (char)239 },
{ "eth" , (char)240 }, { "ntilde", (char)241 }, { "ograve", (char)242 },
{ "oacute", (char)243 }, { "ocirc" , (char)244 }, { "otilde", (char)245 },
{ "ouml" , (char)246 }, { "divide", (char)247 }, { "oslash", (char)248 },
{ "ugrave", (char)249 }, { "uacute", (char)250 }, { "ucirc" , (char)251 },
{ "uuml" , (char)252 }, { "yacute", (char)253 }, { "thorn" , (char)254 },
{ "yuml" , (char)255 }, { 0, (char)0 }
};
const char *CM_PREPROC_parse_html_tag_tolower(const char *body, char *tagname, unsigned int tagnamelen) {
unsigned int cch = 0;
if (*body != '<')
return NULL;
body++;
if ((*body == '!') || (*body == '/'))
body++;
while (isspace((unsigned char) *body))
body++;
while (isalpha((unsigned char) *body)) {
if(--tagnamelen == 0)
break;
*tagname++ = tolower(*body++);
cch++;
}
*tagname = '\0';
if (cch == 0)
return NULL;
while ((*body != '\0') && (*body != '>'))
body++;
if (*body != '>')
return NULL;
/* Return pointer to the ending '>' */
return body;
}
int CM_PREPROC_is_html(const char *body) {
char tagname[100] = {0};
const char *ppHtmlSubsetLowerCase[] = {
"html", "body", "a", "font", "table", "head", "base", "meta", "td", "tr", "style", "img", "object", "br",
"b", "i", "span", "div", "form", "input", "button", "frame", "iframe", "tbody", "col", "th", "hr",
"xml", "script", "pre", "param", "applet", "center", "area", "map", "em", "embed", "xmp", "sub", "sup",
NULL
};
if ((body == NULL) || (*body == '\0'))
return 0;
/* Loop through all '<' chars and try to parse a recognizable HTML tag */
for (body = strchr(body, '<'); body != NULL; body = strchr(body + 1, '<')) {
/* Attempt tp parse the tag */
const char *pTagEnd = CM_PREPROC_parse_html_tag_tolower(body, tagname, sizeof(tagname));
const char **ppCurTag;
if (pTagEnd == NULL)
continue;
/* Check our tag array for its existence (everything is lower case) */
for(ppCurTag = ppHtmlSubsetLowerCase; *ppCurTag != NULL; ppCurTag++) {
const char *pCurTag = *ppCurTag;
if((*pCurTag == *tagname) && (strcmp(tagname, pCurTag) == 0))
return 1;
}
body = pTagEnd;
}
return 0;
}
static char CM_PREPROC_html_tagxlat(char **ref) {
char c = 0, *s = *ref;
unsigned int len = (unsigned int) strlen(s);
unsigned int offset = ( len > 10 ? 10 : len );
CM_PREPROC_html_tags_t *tags;
unsigned int tlen;
if (!isalpha(*s))
return '&';
for (tags = (CM_PREPROC_html_tags_t*)&CM_PREPROC_html_tags; tags->name && !c; tags++) {
tlen = (unsigned int) strlen(tags->name);
if (tlen > offset)
continue;
if (!strncmp(s, tags->name, tlen)) {
c = tags->chr;
s += tlen;
}
}
if (!c)
c = '&';
else if (*s == ';')
s++;
*ref = s;
return c;
}
char *CM_PREPROC_html_strip(char *s, char *text) {
int sgml = 0, tag = 0;
char c, last = '\0', quote = '\0', *t;
if ((t = text) == NULL)
return NULL;
if (!s || !*s)
return NULL;
memset(text, 0, strlen(s)+1);
while ((c = *s++)) {
if (c == quote) {
if (c == '-' && last != '-')
goto next;
else
last = '\0';
quote = '\0';
} else if (!quote) {
switch (c) {
case '<':
tag = 1;
if (*s == '!') {
sgml = 1;
s++;
} else if (*s)
s++;
break;
case '>':
if (tag)
sgml = tag = 0;
break;
case '-':
if (sgml && last == '-')
quote = '-';
else
goto valid;
break;
case '"':
case '\'':
if (tag)
quote = c;
else
goto valid;
break;
case '&':
*t++ = CM_PREPROC_html_tagxlat(&s);
break;
default:
valid:
if (!tag)
*t++ = c;
break;
}
}
next:
last = c;
}
return text;
}
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