From 72cb3ec3ea41ffe18ae86df0197418bdddd044c2 Mon Sep 17 00:00:00 2001
From: elvis <elvilio98@gmail.com>
Date: Wed, 20 Apr 2022 22:34:06 +0200
Subject: [PATCH] Logic to -w

---
 lib/api/api.h |  3 +++
 src/client.c  | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/lib/api/api.h b/lib/api/api.h
index 5266956..4e8e652 100644
--- a/lib/api/api.h
+++ b/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
diff --git a/src/client.c b/src/client.c
index 8d0336b..85ed4af 100644
--- a/src/client.c
+++ b/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;
 }