Initial commit of writer application, written in C. Incomplete.

writer.c

@@ -0,0 +1,84 @@
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h> //mkdir
+#include <sys/types.h>
+#include <fcntl.h> //creat
+#include <unistd.h> //write
+
+#define DIRPERMISSIONS 0700
+#define FILEPERMISSIONS 0655
+
+int main(int argc, char *argv[])
+{
+    // ensure proper usage of the application when executed
+    // writer new dirname link title description keywords
+    // TODO: this could be a single if
+    if (argc != 7 && strcmp(argv[1], "new") == 0)
+    {
+        fprintf(stderr, "Usage: writer <action> <dirname> <data>\nActions: new or reply\nData: new - link title description keywords\nreply - comment\n");
+        return 1;
+    }
+    // writer reply dirname/filename comment
+    if (argc != 4 && strcmp(argv[1], "reply") == 0)
+    {
+        fprintf(stderr, "Usage: writer <action> <dirname/reply_id> <data>\nActions: new or reply\nData: new - link title description keywords\nreply - comment\n");
+        return 1;
+    }
+    
+    //debug output displaying command line arguments
+    if (argc == 7)
+    {
+        printf("debug test input for new: %s, %s, %s, %s, %s\n", argv[2], argv[3], argv[4], argv[5], argv[6]);
+    }
+    if (argc == 4)
+    {
+        printf("debug test input for reply: %s, %s\n", argv[2], argv[3]);
+    }
+
+    // only accepts arguments of a certain length
+    // TODO validation needs to be as configured in config file, plus additional checks. might need to be a validator function
+    //for (int i = 1; i < 5; i++)
+    //{
+    //    if (strlen(argv[i]) > 200)
+    //    {
+    //        fprintf(stderr, "Error: Arguments cannot be longer than 200 characters\n");
+    //        return 1;
+    //    }
+    //}
+
+
+    // action outcomes vary - new links create 4 files, replies create 1
+    if (argc == 7) //new
+    {
+        // create the new link directory from the dirname supplied
+        if (mkdir(argv[2], DIRPERMISSIONS) == -1)
+        {
+            perror("Invalid dirname ");
+            return 1;
+        }
+        // TODO: create, write argv[3], argv[4], argv[5], argv[6]
+    }
+    if (argc == 4) //reply
+    {
+        // TODO: create, write argv[3] with appropriate file name
+    }
+    
+    
+    
+    // example file create action - creates file and returns file descriptor to a variable that is used by the write function
+    // TODO: I don't like this garbage if statement and variable declaration
+    // TODO: implement dirname + filename concatenation for creat function
+    int fdfile = 0;
+    if ((fdfile = creat("data/test", FILEPERMISSIONS))== -1)
+    {
+        perror("Invalid file ");
+        return 1;
+    }
+    
+    // write to file "fdfile"
+    if (write(fdfile, argv[3], strlen(argv[3])) == -1)
+    {
+        perror("Invalid write ");
+        return 1;
+    }
+}