add.c

A simple bibliotech archive coded in C. A real exercise with fopen write and the other base functio

#include "head.h"

void  usage() {
 fprintf (stdout,"\n\nAdd program to the biblioteca.db file\n"
                 "Usage       : Required -t -a -e -n -c -p -f \n"
                 "Flag info   : -t Title of the book\n"
                 "              -a Author of the book\n"
                 "              -e Editor of the book\n"
                 "              -n Number of pages\n"
                 "              -c Cost of the book\n"
                 "              -p Position of the book\n"
                 "              -f Database file to elaborate\n\n");
 }


 
int  load(char *nomefile,struct libro v[])
{
 FILE *f;
 int k=0,i=0;
 if((f=fopen(nomefile,"r"))==NULL){ fprintf(stdout,"[*] I can't load the database file [*]\n");
                                    return -1;
                                  }
 while (fscanf(f,"%s%s%s%d%f\n",v[k].titolo,v[k].autori,&v[k].editore,&v[k].num_pagine,&v[k].costo) !=EOF) k++;
 fflush(f);
 fclose(f);
 return 0;
}

int storage_mem(int position,struct libro ehi,struct libro v[])
{
  int i ;
  if (position>MAX_BOOKS) {fprintf(stdout,"The position you have selected is too high for our database file");return -1;}
  for (i=0;i<MAX_BOOKS;i++) 
 	{ 
	 if 	(strncmp(ehi.titolo,v[i].titolo,(sizeof(ehi.titolo)))==0    &&
     		 strncmp(ehi.autori,v[i].autori,(sizeof(ehi.autori)))==0    &&
     		 strncmp(ehi.editore,v[i].editore,(sizeof(ehi.editore)))==0 &&
     		 ehi.num_pagine==v[i].num_pagine && (ehi.costo==v[i].costo))
     			{ fprintf  (stdout,"[*] The book you have enter is present on our file at position %d Please enter another one [*]\n" ,i);
        		  return -1;
			}
	}
 if (v[position].titolo    !='\0' && 
     v[position].autori     !='\0' && 
     v[position].editore    !='\0' && 
     v[position].num_pagine !='\0'&&
     v[position].costo      !='\0' )
		{
    		fprintf (stdout,"[*] The position %d isn't free position please erease it before writing on [*]\n",position);
    		return -1;
		}
 v[position]=ehi;
 return 0;
}


int  add(char *nome,struct libro passare,int position) 
{ 
FILE *f;
char *risp;
int i,min,max;
if (load(nome,books)==-1) return -1;
fprintf (stdout,"[*] Load the database %s file [*]\n",nome);
if (storage_mem( position,passare,books) ==-1) return -1;
fprintf (stdout,"[*] Saved in memory your entries [*]\n");
fprintf (stdout,"[*] Saving on your database file [*]\n");
if((f=fopen(nome,"r+"))==NULL){ fprintf(stdout,"[*] I can't load the database file [*]\n");
                                    return -1;
                                  }
 for (i=0;i<MAX_BOOKS;i++) fprintf (f,"%s %s %s %d %f\n", books[i].titolo,books[i].autori,books[i].editore,books[i].num_pagine,books[i].costo);

fclose(f);
return 0;
}

int main(int argc , char * argv[])

{
int position;
char *nomefile;
struct libro copia;
char optchar;
	if (argc<14 )
		{
		usage();
		return -1;
		}
	else 
		{
		while ((optchar=getopt(argc,argv,"t:a:e:n:c:p:f:"))!=EOF) 
			{
			switch(optchar) 
				{
         	                case 't' :
					{
					if (strlen(optarg)>MAXLENGTH) 
 					{
					fprintf (stdout,"[*] Yor title length is over the fixed length if you want to change edit head.h [*]\n");
					return -1;
					}
					strncpy(copia.titolo,optarg,MAXLENGTH);
					}
				break;
				case 'a' :
					{
					if (strlen(optarg)>MAXLENGTH)
		                        {
                                        fprintf (stdout,"[*] Yor author length is over the fixed length if you want to change edit head.h [*]\n");
                                        return -1;
                                        }
					strncpy(copia.autori,optarg,MAXLENGTH);
					}
				break;
				case 'e' :
					{
					if (strlen(optarg)>MAXLENGTH)
		                        {
                                        fprintf (stdout,"[*] Yor editor length is over the fixed length if you want to change edit head.h [*]\n");
                                        return -1;
                                        }
					strncpy(copia.editore,optarg,MAXLENGTH);
					}					
				break;
				case 'n' :
					{
					copia.num_pagine=atoi(optarg);
					}
				break;
				
				case 'c' :
					{
					copia.costo=atof(optarg);
					}
					break;
                               
				case 'p' : 
					{
					position=atoi(optarg);
					if (position>MAX_BOOKS|| position<0)
					{
				        fprintf (stdout,"[*] The position is over the MAX position fixed (%d) if you want to change edit head.h [*]\n",MAX_BOOKS);
                                        return -1;

					}
					}
				break;
				case 'f' :

				{
				nomefile=malloc(strlen(optarg));
				strncpy(nomefile,optarg,strlen(optarg));
				}
				
				}
			}
			
	}			
if (add(nomefile,copia,position) ==-1) return -1;
return 0;
}