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coords2.c
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coords2.c
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/*
gcc -c -Wall -Wshadow coords.c
gcc -o 8.coords coords.o
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <err.h>
#include <unistd.h>
/* My type */
typedef struct coord {
int x;
int y;
struct coord* next;
}Coord;
typedef struct mylist
{
struct coord *first;
struct coord *last;
int length;
}Mylist;
/* List Functions*/
int
static emptylist(Mylist* list){
return list->first == NULL;
}
void
static initlist (Mylist *list){
list->first = NULL;
list->last = NULL;
list->length = 0;
}
int
static addlist (Mylist *list, int x , int y){
Coord *coord;
/*test if we have enough memory for this new element*/
if ((coord = (Coord *) malloc (sizeof (Coord))) == NULL)
return -1;
coord->x = x;
coord->y = y;
if (emptylist(list)){
coord->next=NULL;
list->first = coord;
list->last = coord;
}else{
coord->next = list->first;
list->first = coord;
}
list->length++;
return 0;
}
void
static printlist(Mylist *list){
Coord *coord_aux = list->first;
while(coord_aux != NULL){
printf("(%d,%d)\n",coord_aux->x,coord_aux->y);
coord_aux = coord_aux->next;
}
}
// Coords functions //
int
static givemenum(char* c){
return (atoi(c));
}
int
main(int argc,char*argv[])
{
int i,nw,nr,fd,j =0;
int buffer [4096*sizeof(Coord)];
Mylist *coordlist=malloc(sizeof(Coord));
initlist(coordlist);
if (argc == 1){ //Leer e imprimir en orden inverso//
printf("Para introducir coordenas pulse primero un espacio:\n");
char str[24];
int c,n;
i=0;
n=0;
c = getchar();
if ((c == EOF) || (c == '\n')){
str[i] = '\0';
exit(0);
}
Coord *coord_aux=malloc(sizeof(Coord));
for (i=0; i < sizeof str && (c=getchar())!=EOF && c!='\n'; i++){
str[i] = (c-48);
if (c!=32){
n = n+1;
}
if ((n % 2 != 0) &&(c!=32)) {
printf("entro en impar\n");
coord_aux->x = str[i];
}
if ((n % 2 == 0 ) &&(c!=32)){
coord_aux->y = str[i];
printf("entro en par\n");
addlist(coordlist,coord_aux->x,coord_aux->y);
}
}
printf("Imprimiendo la lista:\n");
printlist(coordlist);
free(coord_aux);
exit(0);
}
if (argc == 2){ // hay fichero para leer//
fd = open(argv[1], O_RDONLY);
Coord *coord_aux=malloc(sizeof(Coord));
if(fd < 0)
err(1, "%s", argv[1]);
for(;;){
nr = read(fd, buffer, sizeof buffer );
if(nr == 0) break;
if(nr < 0) err(1, "bad reading");
if(nr > 0){
nr = nr/(sizeof(int));
for (j = 0 ;j < nr;j++){
coord_aux->x=buffer[j];
j++;
coord_aux->y=buffer[j];
addlist(coordlist,coord_aux->x,coord_aux->y);
}
printlist(coordlist);
}
}
close(fd);
exit(0);
}
i = strcmp(argv[1],"-w");
if ((argc == 3) && (i==0)){//Tengo en cuenta el -w//
int n=givemenum(argv[2]);
Coord *coord_aux=malloc(sizeof(Coord));
for (j = 0 ;j <= n;j++){
coord_aux->x = j;
coord_aux->y = j;
nw = write(1, coord_aux,sizeof(coord_aux));
if(nw < 0) err(1, "bad writting");
addlist(coordlist,j,j);
}
exit(0);
}
if ((argc == 3) && (i!=0)){//Tengo en cuenta el -w//
fprintf(stderr,"error :bad command,try -w\n");
exit(0);
}
exit(0);
}