cppcheck/htdocs/archive/validatexml.c

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#include "validatexml.h"
#include <string.h>
#include <stdio.h>
#include <ctype.h>
void skipspaces(const char xmldata[], int *pos, int *linenr)
{
const char *p = &xmldata[*pos];
while (isspace(*p) || *p == '\r' || *p == '\n') {
if (strncmp(p,"\r\n",2)==0)
++p;
if (*p == '\r' || *p == '\n')
++(*linenr);
++p;
}
*pos = p - xmldata;
}
int validatexml(const char xmldata[])
{
if (strncmp(xmldata,"<?xml version=\"1.0\"?>",21)!=0)
return 1;
int linenr = 1;
char elementNames[10][64]; // only 10 element levels handled
int level = 0;
for (int pos = 21; xmldata[pos]; pos++) {
if (strncmp(&xmldata[pos], "\r\n", 2)==0) {
++linenr;
++pos;
} else if (xmldata[pos]=='\r' || xmldata[pos]=='\n') {
++linenr;
} else if (xmldata[pos] == '<') {
// found a element, validate it
++pos;
skipspaces(xmldata,&pos,&linenr);
// is this a end-element?
if (xmldata[pos] == '/') {
// end element without any previous start element
if (level <= 0) {
return linenr;
}
--level;
// compare name of end element with name of start element
int len = strlen(elementNames[level]);
if (strncmp(&xmldata[pos+1],elementNames[level],len)!=0 || xmldata[pos+1+len]!='>')
return linenr;
pos += 1 + len;
} else {
// this validator allows max 8 element levels
if (level > 8)
return linenr;
if (!isalpha(xmldata[pos]))
return linenr;
// add element name to elementNames so it can be compared later against the end element
memset(elementNames[level], 0, 64);
for (int i = 0; i < 64; i++) {
if ((xmldata[pos+i]>='a' && xmldata[pos+i]<='z') || xmldata[pos+i] == '-')
elementNames[level][i] = xmldata[pos+i];
else {
pos += i;
break;
}
}
if (!strchr("/> \r\n", xmldata[pos]))
return linenr;
level++;
// validate all attributes
while (xmldata[pos] != '/' && xmldata[pos] != '>') {
// validate one attribute
skipspaces(xmldata,&pos,&linenr);
if ((xmldata[pos] >= 'a') && xmldata[pos] <= 'z') {
// attribute name
while (((xmldata[pos] >= 'a') && xmldata[pos] <= 'z') || xmldata[pos] == '-')
++pos;
if (xmldata[pos++] != '=')
return linenr;
if (xmldata[pos++] != '\"')
return linenr;
// attribute value
while (isalnum(xmldata[pos]) || strchr(":-.,_",xmldata[pos]))
++pos;
if (xmldata[pos++] != '\"')
return linenr;
if (!strchr("> \r\n", xmldata[pos]))
return linenr;
} else if (xmldata[pos] != '/' && xmldata[pos] != '>') {
return linenr;
}
}
// no end element.. <abc/>
if (xmldata[pos] == '/') {
--level;
++pos;
skipspaces(xmldata,&pos,&linenr);
if (xmldata[pos] != '>')
return linenr;
}
}
} else if (xmldata[pos] == '>') {
return linenr;
}
}
if (level != 0)
return linenr;
2013-07-22 07:26:15 +02:00
return -1;
}