/*

 * libxml2_xmlstring.c : an XML string utilities module

 *

 * This module provides various utility functions for manipulating

 * the xmlChar* type. All functions named xmlStr* have been moved here

 * from the parser.c file (their original home).

 *

 * See Copyright for the status of this software.

 *

 * UTF8 string routines from:

 * William Brack <wbrack@mmm.com.hk>

 *

 * daniel@veillard.com

 * Portion Copyright © 2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. 

 */

#define IN_LIBXML

#include "xmlenglibxml.h"

#include <stdlib.h>

#include <string.h>

#include <stdapis/libxml2/libxml2_globals.h>

#include <stdapis/libxml2/libxml2_parserinternals.h>

#include "libxml2_errencoding.h"

#include <stdapis/libxml2/libxml2_xmlstring.h>

/************************************************************************

 *                                                                      *

 *                Commodity functions to handle xmlChars                *

 *                                                                      *

 ************************************************************************/

/**

 * xmlStrndup:

 * @param cur the input xmlChar*

 * @param len the len of cur

 *

 * a strndup for array of xmlChar's

 *

 * Returns a new xmlChar* or NULL

 *

 * OOM: possible --> returns NULL for (cup!=NULL && len>=0) and sets OOM flag

 */

XMLPUBFUNEXPORT xmlChar *

xmlStrndup(const xmlChar *cur, int len) {

    xmlChar *ret;

    if (!cur || (len < 0))

        return(NULL);

    ret = (xmlChar*) xmlMallocAtomic((len + 1) * sizeof(xmlChar));

    if (!ret) {

        // NOTE: error reporting is removed; it will be done from xmlMalloc	

        return ret; // ret is NULL here

    }

    memcpy(ret, cur, len * sizeof(xmlChar));

    ret[len] = 0;

    return(ret);

}

/**

 * xmlStrdup:

 * @param cur the input xmlChar *

 *

 * a strdup for array of xmlChar's. Since they are supposed to be

 * encoded in UTF-8 or an encoding with 8bit based chars, we assume

 * a termination mark of '0'.

 *

 * Returns a new xmlChar * or NULL

 *

 * OOM: possible --> returns NULL for cur!=NULL and sets OOM flag

 */

XMLPUBFUNEXPORT xmlChar*

xmlStrdup(const xmlChar *cur) {

    const xmlChar *p = cur;

    if (!cur)

        { // This should not normally happen -- check argument before calling!

        // NOTE: Avoiding usage of NULL here improves generated assembly!

        return(xmlChar*)cur /* NULL */;

        }

    while (*p != 0)

        p++; /* non input consuming */

    return(xmlStrndup(cur, p - cur));

}

/**

 * xmlCharStrndup:

 * @param cur the input char *

 * @param len the len of cur

 *

 * a strndup for char's to xmlChar's

 *

 * Returns a new xmlChar * or NULL

 */

XMLPUBFUNEXPORT xmlChar *

xmlCharStrndup(const char *cur, int len) {

    int i;

    xmlChar *ret;

    if ((cur == NULL) || (len < 0)) return(NULL);

    ret = (xmlChar *) xmlMallocAtomic((len + 1) * sizeof(xmlChar));

    if (ret == NULL) {

        xmlErrMemory(NULL, NULL);

        return(NULL);

    }

    for (i = 0;i < len;i++)

        ret[i] = (xmlChar) cur[i];

    ret[len] = 0;

    return(ret);

}

/**

 * xmlCharStrdup:

 * @param cur the input char *

 *

 * a strdup for char's to xmlChar's

 *

 * Returns a new xmlChar * or NULL

 */

XMLPUBFUNEXPORT xmlChar *

xmlCharStrdup(const char *cur) {

    const char *p = cur;

    if (cur == NULL) return(NULL);

    while (*p != '\0') p++; /* non input consuming */

    return(xmlCharStrndup(cur, p - cur));

}

/**

 * xmlStrcmp:

 * @param str1 the first xmlChar *

 * @param str2 the second xmlChar *

 *

 * a strcmp for xmlChar's

 *

 * Returns the integer result of the comparison

 */

XMLPUBFUNEXPORT int

xmlStrcmp(const xmlChar *str1, const xmlChar *str2) {

    register int tmp;

    if (str1 == str2) return(0);

    if (str1 == NULL) return(-1);

    if (str2 == NULL) return(1);

    do {

        tmp = *str1++ - *str2;

        if (tmp != 0) return(tmp);

    } while (*str2++ != 0);

    return 0;

}

/**

 * xmlStrEqual:

 * @param str1 the first xmlChar *

 * @param str2 the second xmlChar *

 *

 * Check if both string are equal of have same content

 * Should be a bit more readable and faster than xmlStrEqual()

 *

 * Returns 1 if they are equal, 0 if they are different

 *

 * OOM: never

 */

// OPTIMIZE:

//           - consider inlining OR

//           - define as macro that tests first bytes prior calling it

//           - for many caller functions safty checks are redundant (consider creating version w/o them)

XMLPUBFUNEXPORT int

xmlStrEqual(const xmlChar *str1, const xmlChar *str2) {

    if (str1 == str2) return(1);

    if (str1 == NULL) return(0);

    if (str2 == NULL) return(0);

    do {

        if (*str1++ != *str2)

            return(0);

    } while (*str2++);

    return(1);

}

/**

 * xmlStrQEqual:

 * @param pref the prefix of the QName

 * @param name the localname of the QName

 * @param str the second xmlChar *

 *

 * Check if a QName is Equal to a given string

 *

 * Returns 1 if they are equal, 0 if they are different

 */

XMLPUBFUNEXPORT int

xmlStrQEqual(const xmlChar *pref, const xmlChar *name, const xmlChar *str) {

    if (pref == NULL) return(xmlStrEqual(name, str));

    if (name == NULL) return(0);

    if (str == NULL) return(0);

    do {

        if (*pref++ != *str) return(0);

    } while ((*str++) && (*pref));

    if (*str++ != ':') return(0);

    do {

        if (*name++ != *str) return(0);

    } while (*str++);

    return(1);

}

/**

 * xmlStrncmp:

 * @param str1 the first xmlChar *

 * @param str2 the second xmlChar *

 * @param len the max comparison length

 *

 * a strncmp for xmlChar's

 *

 * Returns the integer result of the comparison

 *

 * OOM: never

 */

XMLPUBFUNEXPORT int

xmlStrncmp(const xmlChar *str1, const xmlChar *str2, int len) {

    register int tmp;

    if (len <= 0) return(0);

    if (str1 == str2) return(0);

    if (str1 == NULL) return(-1);

    if (str2 == NULL) return(1);

#ifdef __GNUC__

    tmp = strncmp(str1, str2, len);

    return tmp;

#else

    do {

        tmp = *str1++ - *str2;

        if (tmp != 0 || --len == 0) return(tmp);

    } while (*str2++ != 0);

    return 0;

#endif

}

static const xmlChar casemap[256] = {

    0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,

    0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,

    0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,

    0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,

    0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,

    0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,

    0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,

    0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,

    0x40,0x61,0x62,0x63,0x64,0x65,0x66,0x67,

    0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,

    0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,

    0x78,0x79,0x7A,0x7B,0x5C,0x5D,0x5E,0x5F,

    0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,

    0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,

    0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,

    0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F,

    0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,

    0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,

    0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,

    0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,

    0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,

    0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,

    0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,

    0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF,

    0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,

    0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,

    0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,

    0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,

    0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,

    0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,

    0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,

    0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF

};

/**

 * xmlStrcasecmp:

 * @param str1 the first xmlChar *

 * @param str2 the second xmlChar *

 *

 * a strcasecmp for xmlChar's

 *

 * Returns the integer result of the comparison

 */

XMLPUBFUNEXPORT int

xmlStrcasecmp(const xmlChar *str1, const xmlChar *str2) {

    register int tmp;

    if (str1 == str2) return(0);

    if (str1 == NULL) return(-1);

    if (str2 == NULL) return(1);

    do {

        tmp = casemap[*str1++] - casemap[*str2];

        if (tmp != 0) return(tmp);

    } while (*str2++ != 0);

    return 0;

}

/**

 * xmlStrncasecmp:

 * @param str1 the first xmlChar *

 * @param str2 the second xmlChar *

 * @param len the max comparison length

 *

 * a strncasecmp for xmlChar's

 *

 * Returns the integer result of the comparison

 */

XMLPUBFUNEXPORT int

xmlStrncasecmp(const xmlChar *str1, const xmlChar *str2, int len) {

    register int tmp;

    if (len <= 0) return(0);

    if (str1 == str2) return(0);

    if (str1 == NULL) return(-1);

    if (str2 == NULL) return(1);

    do {

        tmp = casemap[*str1++] - casemap[*str2];

        if (tmp != 0 || --len == 0) return(tmp);

    } while (*str2++ != 0);

    return 0;

}

/**

 * xmlStrchr:

 * @param str the xmlChar * array

 * @param val the xmlChar to search

 *

 * a strchr for xmlChar's

 *

 * Returns the xmlChar* for the first occurrence or NULL.

 */

XMLPUBFUNEXPORT const xmlChar *

xmlStrchr(const xmlChar *str, xmlChar val) {

    if (str == NULL) return(NULL);

    while (*str != 0) { /* non input consuming */

        if (*str == val) return((xmlChar *) str);

        str++;

    }

    return(NULL);

}

/**

 * xmlStrstr:

 * @param str the xmlChar * array (haystack)

 * @param val the xmlChar to search (needle)

 *

 * a strstr for xmlChar's

 *

 * Returns the xmlChar * for the first occurrence or NULL.

 *

 * OOM: never

 */

XMLPUBFUNEXPORT const xmlChar *

xmlStrstr(const xmlChar *str, const xmlChar *val) {

    int n;

    if (str == NULL) return(NULL);

    if (val == NULL) return(NULL);

    n = xmlStrlen(val);

    if (n == 0) return(str);

    while (*str != 0) { /* non input consuming */

        if (*str == *val) {

            if (!xmlStrncmp(str, val, n)) return((const xmlChar *) str);

        }

        str++;

    }

    return(NULL);

}

/**

 * xmlStrcasestr:

 * @param str the xmlChar * array (haystack)

 * @param val the xmlChar to search (needle)

 *

 * a case-ignoring strstr for xmlChar's

 *

 * Returns the xmlChar * for the first occurrence or NULL.

 */

XMLPUBFUNEXPORT const xmlChar *

xmlStrcasestr(const xmlChar *str, xmlChar *val) {

    int n;

    if (str == NULL) return(NULL);

    if (val == NULL) return(NULL);

    n = xmlStrlen(val);

    if (n == 0) return(str);

    while (*str != 0) { /* non input consuming */

        if (casemap[*str] == casemap[*val])

            if (!xmlStrncasecmp(str, val, n)) return(str);

        str++;

    }

    return(NULL);

}

/**

 * xmlStrsub:

 * @param str the xmlChar * array (haystack)

 * @param start the index of the first char (zero based)

 * @param len the length of the substring

 *

 * Extract a substring of a given string

 *

 * Returns the xmlChar * for the first occurrence or NULL.

 */

XMLPUBFUNEXPORT xmlChar *

xmlStrsub(const xmlChar *str, int start, int len) {

    int i;

    if (str == NULL) return(NULL);

    if (start < 0) return(NULL);

    if (len < 0) return(NULL);

    for (i = 0;i < start;i++) {

        if (*str == 0) return(NULL);

        str++;

    }

    if (*str == 0) return(NULL);

    return(xmlStrndup(str, len));

}

/**

 * xmlStrlen:

 * @param str the xmlChar * array

 *

 * length of a xmlChar's string

 *

 * Returns the number of xmlChar contained in the ARRAY.

 */

XMLPUBFUNEXPORT int

xmlStrlen(const xmlChar *str) {

    int len = 0;

    if (str == NULL) return(0);

    while (*str != 0) { /* non input consuming */

        str++;

        len++;

    }

    return(len);

}

/**

 * xmlStrncat:

 * @param cur the original xmlChar* array

 * @param add the xmlChar* array added

 * @param len the length of add

 *

 * a strncat for array of xmlChar's, it will extend cur with the len

 * first bytes of add.

 *

 * Returns a new xmlChar*, the original cur is reallocated if needed

 * and should not be freed

 *

 * OOM: possible --> OOM flag is set  

 */

XMLPUBFUNEXPORT xmlChar*

xmlStrncat(xmlChar* cur, const xmlChar* add, int len)

{

    int size;

    xmlChar* ret;

    if ((add == NULL) || (len == 0))

        return(cur);

    if (cur == NULL)

        return(xmlStrndup(add, len));

    size = xmlStrlen(cur);

    // DONE: Fix xmlRealloc: Nothing to fix!

    ret = (xmlChar*) xmlRealloc(cur, (size + len + 1) * sizeof(xmlChar));

    if (!ret) {

        xmlErrMemory(NULL, NULL);

        return(cur);

    }

    memcpy(&ret[size], add, len * sizeof(xmlChar));

    ret[size + len] = 0;

    return(ret);

}

/**

 * xmlStrncatNew:

 * @param str1 first xmlChar string

 * @param str2 second xmlChar string

 * @param len the len of str2

 *

 * same as xmlStrncat, but creates a new string.  The original

 * two strings are not freed.

 *

 * Returns a new xmlChar* or NULL

 *

 * OOM: possible --> returns NULL, sets OOM flag

 */

XMLPUBFUNEXPORT xmlChar *

xmlStrncatNew(const xmlChar *str1, const xmlChar *str2, int len) {

    int size;

    xmlChar *ret;

    if ((str2 == NULL) || (len == 0))

        return(xmlStrdup(str1));

    if (str1 == NULL)

        return(xmlStrndup(str2, len));

    size = xmlStrlen(str1);

    ret = (xmlChar *) xmlMalloc((size + len + 1) * sizeof(xmlChar));

    if (ret == NULL) {

        xmlErrMemory(NULL, NULL); // sets OOM flag

        //return(xmlStrndup(str1, size)); 

        return NULL;

    }

    memcpy(ret, str1, size * sizeof(xmlChar));

    memcpy(&ret[size], str2, len * sizeof(xmlChar));

    ret[size + len] = 0;

    return(ret);

}

/**

 * xmlStrcat: