Working with pointers in C - c

Question

I have created this program in c. The user type 'lieunaissance' and then we open a formatted file to search 'lieunaissance' value.
I had a problem with the file, but now, my problem is with my structure struct departement *recherche_dpt(char recherche_code[]), it always returns CODE_NON_TROUVE = 0.
How should I solve this, please?
#include<stdio.h>
#include<string.h>
#include<ctype.h>
#include<stdlib.h>
#include<stddef.h>
#include <errno.h>
#define MAX_dpt 100000
#define KEY_NOT_FOND "NOT_FOUND"
/* global statement */
struct departement
{
char currentCode[10];
char oldCode[10];
char name[50];
struct departement *predecesseur ;
struct departement *successeur;
};
struct departement *debut_liste, *fin_liste;
struct departement *undepartement();
void ouvrir_fichier(char Nomfichier[]);
struct departement *search_dpt(char recherche_code[]);
struct departement tabdpt[MAX_dpt];
int main()
{
char sexe, reponse, date[5], annee[3], mois[4], bidon[3],birthPlace[30], ordre[4], struct1[6], struct2[6],nir1[12],nir[13],nir2[13], nirancien[13] ;
int i, namebre, cle, reste,n;
long int val;
struct departement undpt, *pointeur;
char code[10];
scanf("%s",birthPlace);
// convert birthplace uppercase and assign it to name
int k = 0;
while(birthPlace[k])
{
birthPlace[k] = toupper(birthPlace[k]);
k++;
}
printf("%s\n", birthPlace);
// Read in the file
ouvrir_fichier("Basedecommunes.txt");
pointeur=search_dpt(birthPlace);
undpt = *pointeur;
if (strcmp(undpt.currentCode,KEY_NOT_FOND)==0)
{
printf("No ""%s"" has been found \n",birthPlace);
}
else
{
printf("Current code : %s\n",undpt.currentCode);
printf("Old code : %s\n",undpt.oldCode);
printf("Department name : %d\n",undpt.name);
}
void ouvrir_fichier(char Nomfichier[])
{
struct departement *ptmp, *prec, *succ;
FILE *f1;
int nb, lire;
nb=0;
f1=fopen(Nomfichier, "r" );
if (f1 == NULL) {
printf("fopen failed, errno = %d\n", errno);
}
else {
printf("fopen succeeded\n");
while ((! feof(f1)) && (nb < MAX_dpt) )
{
ptmp=undepartement();
if (ptmp != NULL) {
lire=fscanf (f1, "%s %s %s", (*ptmp).currentCode, (*ptmp).oldCode, (*ptmp).name);
printf("lire = %d\n",lire);
if (lire != EOF)
{
(*ptmp).predecesseur=NULL ;
(*ptmp).successeur=NULL;
if (debut_liste == NULL)
{
debut_liste=ptmp ;
fin_liste=ptmp ;
}
else
{
(*fin_liste).successeur=ptmp ;
(*ptmp).predecesseur=fin_liste ;
fin_liste=ptmp ;
}
nb++ ;
}
} else {
printf("malloc error\n");
}
}
}
fclose(f1);
}
/*--- fonction de recherche --- */
struct departement *search_dpt(char dep_name[])
{
struct departement ptmp, *pointeur, *pactu;
int trouve ;
trouve = 0 ;
pointeur=undepartement();
strcpy((*pointeur).currentCode, KEY_NOT_FOND);
pactu=debut_liste ;
while ((! trouve) && (pactu != NULL))
{
ptmp = (*pactu) ;
pactu=(*pactu).successeur ;
trouve=((strcmp(ptmp.currentCode,dep_name))==0) ;
if (trouve)
{
*pointeur=ptmp ;
}
}
return pointeur;
}
/* --- allocation memoire d'une nouvelle structure --- */
struct departement * undepartement(void)
{
struct departement *p = malloc(sizeof *p);
return p;
}
The file content:
01001 01001 ABERGEMENT-CLEMENCIAT
01002 01002 ABERGEMENT-DE-VAREY
01003 01003 AMAREINS
01004 01004 AMBERIEU-EN-BUGEY
01005 01005 AMBERIEUX-EN-DOMBES
01006 01006 AMBLEON
01007 01007 AMBRONAY
01008 01008 AMBUTRIX
01009 01009 ANDERT-ET-CONDON
01010 01010 ANGLEFORT
01011 01011 APREMONT
01012 01012 ARANC
01013 01013 ARANDAS
01014 01014 ARBENT
01015 01015 ARBIGNIEU
01016 01016 ARBIGNY

Answer 1

In your code,
strcpy((*pointeur).codeactuel, CODE_NON_TROUVE);
codeactuel is defined to have a size of 10, but to copy CODE_NON_TROUVE you need to have a size of 11.
Then, printf(birthPlace); is also wrong, it should be something like
printf("%s\n", birthPlace);
Also, there is a logical problem in
pointeur=undepartement();
if malloc() fails and undepartement() returns NULL, you'll be facing undefined behaviour by dereferencing pointeur. Please add a NULL check.
P.S - There maybe other issues. Please provide a MCVE and if possible kindly stick to english so that we can understand the code logic in a better way.

Answer 2

Inside while loop you are comparing .currentCode with .dep_name.
This was wrong. Change the code to this:
// trouve=((strcmp(ptmp.currentCode,dep_name))==0) ;
trouve=((strcmp(ptmp.name,dep_name))==0) ;
And it works correct.