Merge pull request ''EditFilePost' function' (#30) from 29-EditFilePost into master

Reviewed-on: #30

BlogDB.c

@@ -12,6 +12,7 @@ static MYSQL* conn2maria();
 static int AddPost(char title[], int authorId, char datePosted[], char post[], int tags[], size_t tagSize, MYSQL* con);
 static int EditPost(int postID, char title[], char post[], MYSQL* con);
 static int AddFilePost(int authorID, char filePath[], MYSQL* con);
+static int EditFilePost(int authorID, char filePath[], int postID, MYSQL* con);
 static int BlogWrite(MYSQL* con);
 static int PullPostData(char* strings[6], int postID, MYSQL* con); 
 static int PullPostDescriptions(int** IDs, char* Titles[255], int** authors, int** dates, MYSQL* con);
@@ -272,6 +273,88 @@ int AddFilePost(int authorID, char filePath[], MYSQL* con)
     return postID;
 }
 
+// Edits a post using file data
+int EditFilePost(int authorID, char filePath[], int postID, MYSQL* con)
+{
+
+    if (con == NULL) 
+    {
+        con = conn2maria();
+    }
+
+    // Author ID <= 0 should default to me.
+    if (authorID <= 0)
+    {
+        authorID = 1;
+    }
+
+    // Define a file and buffer
+    FILE* FilePointer;
+    int BufferLength = 255;
+    char Buffer[BufferLength];
+    char StringEnd[] = "\0";
+
+    // Open file
+    FilePointer = fopen(filePath, "r");
+
+    // Get first line
+    fgets(Buffer, BufferLength, FilePointer);
+
+    // Get the substrings Buffer[0:3] and Buffer[-6:-1]
+    // Buffer[BufferLength] is the same as "\0" but without warnings
+    int LineLength = strlen(Buffer);
+    char startTest[5] = {Buffer[0], Buffer[1], Buffer[2], Buffer[3], Buffer[BufferLength]};
+    char endTest[6] = {Buffer[LineLength - 6], Buffer[LineLength - 5], Buffer[LineLength - 4], Buffer[LineLength - 3], Buffer[LineLength - 2], Buffer[BufferLength]};
+
+    // Check that the firstline starts with "<h3>" and ends with "</h3>"
+    if (!(strcmp(startTest, "<h3>") == 0 && strcmp(endTest, "</h3>") == 0)) {
+        printf("%s What is this %s\n", startTest, endTest);
+        return -1;
+    }
+
+
+    // This is equivalent to Buffer = Buffer[3:-6]
+    // This is done to remove the <h3> tags
+    for (int i = 4; i < BufferLength; ++i) {
+                
+        if (Buffer[i + 6] == StringEnd[0]) {
+            Buffer[i - 4] = StringEnd[0];
+            break;
+        }
+
+        Buffer[i-4] = Buffer[i];
+    }
+
+    // Edits post with correct title, but with an empty post.
+    EditPost(postID, Buffer, "", con);
+
+    // Concat the rest of the file, line by line to the post
+    while (fgets(Buffer, BufferLength, FilePointer)) 
+    {
+        // Build a query
+        char* query;
+        if(0 > asprintf(&query, 
+            "UPDATE blog_posts SET post = CONCAT(post, \"%s\n\") WHERE id=(%d)",
+            Buffer,
+            postID
+        )) exit(1);
+
+        // Query the server, if successful continue, else throw error
+        if (mysql_query(con, query)) 
+        {
+            fprintf(stderr, "%s\n", mysql_error(con));
+            mysql_close(con);
+            exit(1);
+        }
+
+        // Free the memory of the query string
+        free(query);
+    }
+
+    // return the postID of the new post.
+    return postID;
+}
+
 // Open a temporary file containing the standard template, 
 // and add the contents as a post
 int BlogWrite(MYSQL* con)
@@ -1114,7 +1197,7 @@ int main(int argc, char *argv[])
     // Init array of six strings
     // Pull data of postID '1' into 'result'
     char *result[6]; 
-    PullPostData(result, 1, NULL);
+    PullPostData(result, 42, NULL);
 
     // Foreach in result
     for (int i = 0; i < sizeof(result)/sizeof(result[0]); i++)
@@ -1257,6 +1340,7 @@ int main(int argc, char *argv[])
     //TogglePost(81, con);
     //printf("%s\n", IsEnabled(81, con) ? "True" : "False");
     //AddFilePost(1, "/home/adam/Documents/html/linuxenv.html", con);
+    //EditFilePost(1, "/home/adam/Documents/html/linuxenv.html", 42, con);
     //BlogWrite(con);
     
     // =================================