Logic to -w

lib/api/api.h

@@ -4,6 +4,9 @@
 
 #include <time.h>
 
+#define O_CREATE 1
+#define O_LOCK 2
+
 // struttura dati per la lista dei file aperti
 typedef struct openFile_s {
 	char *filename;          // nome del file

src/client.c

@@ -553,10 +553,68 @@ int cmd_w(char *dirname, char *Dir, int print) {
 }
 
 int cmd_W(char *filelist, char *Dir, int print) {
+    if(!filelist) {
+	errno = EINVAL;
+	return -1;
+    }
 
+    // we copy filelist because we are nice
+    char *tofree = malloc(strnlen(filelist, MAXARGLENGTH)+1);
+    if(!tofree) {
+	perror("malloc");
+	return -1;
+    }
+    strncpy(tofree, filelist, strnlen(filelist, MAXARGLENGTH));
 
+    char *token;
+    char *string = tofree;
 
+    if (print == 1) {
+	printf("W - Scrivo i seguenti file sul server:\n");
+	fflush(stdout);
+    }
 
+    while ((token = strsep(&string, ",")) != NULL) {
+	int ok = 1;
+	int opened = 0;
+	if (print == 1) {
+	    printf("%s\n", token);
+	    fflush(stdout);
+	}
+
+	// creo il file in modalita' locked
+	if (openFile(token, O_CREATE | O_LOCK) == -1) {
+	    ok = 0;
+	} else { // creato con successo
+	    opened = 1;
+	}
+
+	if (opened && writeFile(token, Dir) == -1) {
+	    ok = 0;
+	}
+
+	if (opened && !ok) { // errore precedente -> elimino il file vuoto
+	    removeFile(token);
+	} else if (opened && closeFile(token) == -1) { // chiudo il file
+	    ok = 0;
+	}
+
+	if (print != 0) {
+	    printf("Esito: ");
+
+	    if (ok)
+		printf("ok");
+	    else {
+		printf("errore");
+		perror("-w");
+	    }
+
+	    printf("\n");
+	    fflush(stdout);
+	}
+    }
+
+    free(tofree);
     return 0;
 }