Trier un fichier

un
deux
trois
quatre
cinq

deux
trois
quatre
cinq

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



int tri(FILE *flotLecture, FILE *flotEcriture, 
	int(*cmp)(const char *s1, const char *s2))
{
  char ligne1[15];
  char ligne2[15];
  
  if(flotLecture == NULL)
    return 1;
  
  if(flotEcriture == NULL)
    return 1;
  
  long courant;

  while(fgets(ligne1, sizeof ligne1, flotLecture) != NULL)
    {
      courant = ftell(flotLecture);
      
      while(fgets(ligne2, sizeof ligne2, flotLecture) != NULL)
	{
	  if((*cmp)(ligne1,ligne2) > 0)
	    {
	      char buf[BUFSIZ];
	      
	      strcpy(buf,ligne1);
	      
	      char *tmp1 = malloc(strlen(ligne2)+1);
	      if(tmp1 == NULL)
		return 1;
	      strcpy(tmp1,ligne2);
	      
	      char *tmp2 = malloc(strlen(buf)+1);
	      if(tmp2 == NULL)
		return 1;
	      strcpy(tmp2,buf);
	      
	      fprintf(flotEcriture,"%s",tmp1);

	      free(tmp1);
	      free(tmp2);
	      
	    }
	  
	}
      
      fseek(flotLecture,courant,SEEK_CUR);
      
    }
  
  fclose(flotEcriture);
  fclose(flotLecture);
  
  return 0;
}




int main(int argc, char *argv[])
{
  FILE *lecture = fopen("lire","r");
  FILE *ecriture = fopen("ecrire","w");
  
  if(tri(lecture,ecriture,&strcmp))
    {
      fprintf(stderr,"erreur \n");
    }
  
  return EXIT_SUCCESS;
}