utf8.c

/* ----------------------------------------------------------------- */
/*  CODE FOR PARSING INDIAN LANGUAGES				               */
/*           developed by Indian Language Text-to-Speech Consortium  */
/* ----------------------------------------------------------------- */
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/*  Copyright (c) 2015  Indian Language Text-to-Speech Consortium    */
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/* ########################### Author Info ######################### */
/*		Name:	Arun Baby
/*  	Orgn: 	IIT Madras
/*		Date:	01-01-2016
/*		Desc:	UTF-8 Handler for unifed parser
/* ########################### Author Info END ##################### */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "utf8.h"

char *Utf8Replace(char *needle, char *replace, char *haystack)
{
	size_t replaceLength = strlen(replace), needleLength = strlen(needle), len = strlen(haystack);
	int32_t diff = (int32_t)(replaceLength - needleLength);
	char *newString = calloc((len + diff + 1), sizeof(char));
	char *pos = strstr(haystack, needle);
	if (pos == NULL)
	{
		strcpy(newString, haystack);
		return newString;
	}
	size_t numberOfShifts = pos - haystack;
	memcpy(newString, haystack, numberOfShifts);																 // Add begining of the string
	memcpy(newString + numberOfShifts, replace, replaceLength);													 // Copy the replacement in place of the needle
	memcpy(newString + numberOfShifts + replaceLength, pos + needleLength, len - numberOfShifts - needleLength); // Copy the remainder of the initial string
	return newString;
}
char *Utf8ReplaceAll(char *needle, char *replace, char *haystack)
{
	char *newString = Utf8Replace(needle, replace, haystack), *oldString = NULL;
	if (strstr(newString, needle) == NULL)
	{
		return newString;
	}
	while (strstr(newString, needle) != NULL)
	{
		oldString = newString;
		newString = Utf8Replace(needle, replace, newString);
		free(oldString);
	}
	return newString;
}