ns_getcsv reads one line of CSV data from the specified file and and sets the variable specified by varName to a list of the elements in that row. Any quotes in the line of data are removed. ns_getcsv returns the number of elements in the row.
If there are no more lines in the file to read, varName does not get set, and ns_getcsv returns -1 as the number of elements in the row.
A CSV file is an ASCII file containing rows of data in the following syntax:
Elements in each row must be separated by commas.
Each row must end with either \n, \r, or \r\n.
Elements that contain commas, newlines, or carriage returns can be surrounded by double quotes (e.g., "foo,bar").
If an element surrounded by double quotes also contains a double quote, you can escape the interior double quote by using two double quotes (e.g., "Evander ""Real Deal"" Holyfield"
White space that isn't inside double quotes is ignored. For example, the line: 'bob, sarah, mary' will result in the list {bob sarah mary}.
Null entries are okay, either embedded in the line or at the end of a line. For example, the line: 'bob,,sarah, ' will result in the list: {bob {} sarah {}}.