#include <stdio.h>
#include <string.h>
#include <malloc.h>
char* _replace(char* source_str,char* search_str,char* replace_str)
 {
 char *ostr, *nstr = NULL, *pdest = "";
 int length, nlen;
 unsigned int nstr_allocated;
 unsigned int ostr_allocated;
 
 if(!source_str || !search_str || !replace_str){
 printf("Not enough arguments\n");
 return NULL;
 }
 ostr_allocated = sizeof(char) * (strlen(source_str)+1);
 ostr = malloc( sizeof(char) * (strlen(source_str)+1));
 if(!ostr){
 printf("Insufficient memory available\n");
 return NULL;
 }
 strcpy(ostr, source_str);
 
 while(pdest)
 {
 pdest = strstr( ostr, search_str );
 length = (int)(pdest - ostr);
 
 if ( pdest != NULL )
 {
 ostr[length]='\0';
 nlen = strlen(ostr)+strlen(replace_str)+strlen( strchr(ostr,0)+strlen(search_str) )+1;
 if( !nstr || /* _msize( nstr ) */ nstr_allocated < sizeof(char) * nlen){
 nstr_allocated = sizeof(char) * nlen;
 nstr = malloc( sizeof(char) * nlen );
 }
 if(!nstr){
 printf("Insufficient memory available\n");
 return NULL;
 }
 
 strcpy(nstr, ostr);
 strcat(nstr, replace_str);
 strcat(nstr, strchr(ostr,0)+strlen(search_str));
 
 if( /* _msize(ostr) */ ostr_allocated < sizeof(char)*strlen(nstr)+1 ){
 ostr_allocated = sizeof(char)*strlen(nstr)+1;
 ostr = malloc(sizeof(char)*strlen(nstr)+1 );
 }
 if(!ostr){
 printf("Insufficient memory available\n");
 return NULL;
 }
 strcpy(ostr, nstr);
 }
 }
 if(nstr)
 free(nstr);
 return ostr;
 }