string.h File Reference

#include <libxml/xmlstring.h>

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Functions
XML_HIDDEN xmlChar *	xmlEscapeFormatString (xmlChar **msg)

Function Documentation

xmlEscapeFormatString()

XML_HIDDEN xmlChar * xmlEscapeFormatString

(

xmlChar **

msg

)

xmlEscapeFormatString: @msg: a pointer to the string in which to escape '' characters. Must be a heap-allocated buffer created by libxml2 that may be returned, or that may be freed and replaced.

Replaces the string pointed to by 'msg' with an escaped string. Returns the same string with all '' characters escaped.

Definition at line 1001 of file xmlstring.c.

{
    xmlChar *msgPtr = NULL;
    xmlChar *result = NULL;
    xmlChar *resultPtr = NULL;
    size_t count = 0;
    size_t msgLen = 0;
    size_t resultLen = 0;
 
    if (!msg || !*msg)
        return(NULL);
 
    for (msgPtr = *msg; *msgPtr != '\0'; ++msgPtr) {
        ++msgLen;
        if (*msgPtr == '%')
            ++count;
    }
 
    if (count == 0)
        return(*msg);
 
    if ((count > INT_MAX) || (msgLen > INT_MAX - count))
        return(NULL);
    resultLen = msgLen + count + 1;
    result = (xmlChar *) xmlMallocAtomic(resultLen);
    if (result == NULL) {
        /* Clear *msg to prevent format string vulnerabilities in
           out-of-memory situations. */
        xmlFree(*msg);
        *msg = NULL;
        return(NULL);
    }
 
    for (msgPtr = *msg, resultPtr = result; *msgPtr != '\0'; ++msgPtr, ++resultPtr) {
        *resultPtr = *msgPtr;
        if (*msgPtr == '%')
            *(++resultPtr) = '%';
    }
    result[resultLen - 1] = '\0';
 
    xmlFree(*msg);
    *msg = result;
 
    return *msg;
}