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/* File: ops.c
* Program: unhtml
* Written by: Kevin Swan, 013639s@dragon.acadiau.ca
* Completed: February 3, 1998
* Version: 2.3
*/
#include <malloc.h>
#include <stdlib.h>
#include <string.h>
#include "ops.h"
/*
* Checks if a given tag is an HTML script opening tag, <SCRIPT>.
* It checks in a case-insensitive manner.
*
* Given: a string that is an HTML tag.
* Return: 1 if that tag is a script opening tag, 0 otherwise.
*/
int isScriptOpeningTag (char *tag) {
int i = 0;
while (tag[i] != '\0') {
switch (i) {
case 0: if (tag[i] != '<')
return 0;
break;
case 1: if ((tag[i] != 's') && (tag[i] != 'S'))
return 0;
break;
case 2: if ((tag[i] != 'c') && (tag[i] != 'C'))
return 0;
break;
case 3: if ((tag[i] != 'r') && (tag[i] != 'R'))
return 0;
break;
case 4: if ((tag[i] != 'i') && (tag[i] != 'I'))
return 0;
break;
case 5: if ((tag[i] != 'p') && (tag[i] != 'P'))
return 0;
break;
case 6: if ((tag[i] != 't') && (tag[i] != 'T'))
return 0;
break;
default: return 1;
} /* switch */
i++;
} /* while */
return 0;
}
/*
* Checks if a given tag is an HTML script closing tag, </SCRIPT>.
* It checks in a case-insensitive manner.
*
* Given: a string that is an HTML tag.
* Return: 1 if that tag is a script closing tag, 0 otherwise.
*/
int isScriptClosingTag (char *tag) {
int i = 0;
while (tag[i] != '\0') {
switch (i) {
case 0: if (tag[i] != '<')
return 0;
break;
case 1: if (tag[i] != '/')
return 0;
break;
case 2: if ((tag[i] != 's') && (tag[i] != 'S'))
return 0;
break;
case 3: if ((tag[i] != 'c') && (tag[i] != 'C'))
return 0;
break;
case 4: if ((tag[i] != 'r') && (tag[i] != 'R'))
return 0;
break;
case 5: if ((tag[i] != 'i') && (tag[i] != 'I'))
return 0;
break;
case 6: if ((tag[i] != 'p') && (tag[i] != 'P'))
return 0;
break;
case 7: if ((tag[i] != 't') && (tag[i] != 'T'))
return 0;
break;
default: return 1;
} /* switch */
i++;
} /* while */
return 0;
}
/*
* Checks if a given tag is an actual HTML tag
* It checks in a case-insensitive manner.
*
* Given: a string that could be an HTML tag.
* Return: 1 if that tag is an HTML tag, 0 otherwise
*/
int isRealHtmlTag (char *tag) {
static char *html[] = {
"a", "abbrev", "acronym", "address", "applet", "area",
"b", "base", "basefont", "bdo", "big", "blockquote", "body",
"br", "button",
"caption", "center", "cite", "code", "col", "colgroup",
"dd", "del", "dfn", "dir", "div", "dl", "dt",
"em",
"fieldset", "font", "form", "frame", "frameset",
"h1", "h2", "h3", "h4", "h5", "h6", "head", "hr", "html",
"i", "iframe", "img", "input", "ins", "isindex",
"kbd",
"label", "legend", "li", "link", "map", "menu", "meta",
"noframes", "noscript",
"object", "ol", "optgroup", "option",
"p", "param", "pre",
"q",
"s", "samp", "script", "select", "small", "span", "strike",
"strong", "style", "sub",
"table", "tbody", "td", "textarea", "tfoot", "th", "thead",
"title", "tr", "tt",
"u", "ul",
"var",
0 };
int ii, jj, len;
int result;
static char *ptr = 0;
static int taglen = 256;
result = 0;
/*
* keep around a static buffer for the tag -- initialize it the
* first time thru
*/
len = strlen(tag) + 1;
len = (len > taglen) ? len : taglen;
if (!ptr) {
ptr = (char *)malloc(len);
if (!ptr) {
fprintf (stderr, "Cannot malloc in tag test (%d bytes)\n", len);
exit(1);
}
memset(ptr, 0, len);
taglen = len;
}
/*
* if the tag's longer than the space we've already set aside,
* make a bigger space
*/
if (len > taglen) {
free(ptr);
while (taglen < len)
taglen *= 2;
ptr = (char *)malloc(taglen);
if (!ptr) {
fprintf (stderr, "Cannot malloc in tag test (%d bytes)\n", len);
exit(1);
}
}
memset(ptr, 0, taglen);
/*
* copy the useful parts of the tag into our buffer
*/
jj = 0;
for (ii = 0; ii < len; ii++) {
if (tag[ii] == '<')
continue;
if (tag[ii] == '/' && ii == 1)
continue;
if (tag[ii] == ' ' || tag[ii] == '>' || tag[ii] == '\n')
break;
ptr[jj++] = tag[ii];
}
/*
* see if the tag is an actual html tag
*/
for (ii = 0; html[ii] != 0; ii++)
if (strcasecmp(ptr, html[ii]) == 0) {
result = 1;
break;
}
return result;
}
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