[C] insere mot table de hachage

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>

#define BUFFSIZE 64
#define FNAME "d:\\test.txt"
#define TAILLEHASH 307

typedef struct L
{
	int freq;
	char mot[50];

	struct L *suivant;
} Liste;




char* get_word(FILE *fdesc, char *buff, size_t size)
{
	char *ret=NULL;

	if( fdesc!=NULL && buff!=NULL && size>0 )
	{
		int c;
		int i=0;
		while( ret==NULL && i<size && (c=fgetc(fdesc))!=EOF )
		{
			if( isalpha(c) )
			{
				buff[i]=c;
				i++;
			}
			else if( i>0 )
			{	/* mot */
				buff[i]='\0';
				ret=buff;
			}
		}
	}
	return ret;
}
unsigned int hash_cle(const char * mot)
{
	unsigned int val = 0;
	for(; *mot != '\0'; ++mot)
	{
		val = *mot + 31 * val;
	}
	return val % TAILLEHASH;
}

void insere_th(Liste **TableHash, const char *mot)
{
    TableHash = (Liste **) malloc (TAILLEHASH * sizeof(Liste *));

    	/* calcule le hash du mot */
	unsigned int idx = hash_cle(mot);

	/* recherche du mot */
	Liste *p = TableHash[idx];
	if(strcmp(p->mot, mot)==0)
        p->freq++;
	
	free(TableHash);

}







int main(void)
{
	FILE *fdesc=fopen(FNAME,"r");
	Liste **TableHash;

	if( fdesc )
	{
		char buff[BUFFSIZE];
		char prec[BUFFSIZE];


		if( get_word(fdesc,prec,BUFFSIZE) )
		{
			while( get_word(fdesc, buff, BUFFSIZE) )
			{
				//printf("%s %s\n",prec,buff);
				char s3[BUFFSIZE * 2];
                sprintf(s3, "%s %s", prec, buff);
                puts(s3);
				strncpy( prec,buff,BUFFSIZE);
				insere_th(TableHash,s3);
			}
		}
		fclose(fdesc);
	}

	return 0;
}

Configuration: Windows Vista
Internet Explorer 7.0