CS 2734 Computer Organization II

Do the following prior to the laboratory.

• Create a separate directory and download the following programs:
  • The parseLine.c main program.
  • The parse.h include file.
  • The parse.c source file.
  • The Makefile makefile.

• Perform a make to be sure that you have downloaded the programs correctly.

• Write the code for the stubs listed in parse.c. These functions determine the type of each token as follows:
  • DIRECTIVE - the ".WORD" string.
  • LITERAL - a string that starts with an alphabetic character or $ and includes letters, numbers, dollar sign or underscore.
  • LABEL_DEF - a literal followed by a colon.
  • NUMERIC - an unsigned integer value.
  • INVALID_TOKEN - not one of the specified types.

  You may find the following C library functions useful:

  •       size_t strspn(const char *cs, const char *ct);
    

    returns the length of the prefix of cs consisting of characters that are in ct.

  •       size_t strcspn(const char *cs, const char *ct);
    

    returns the length of the prefix in cs consisting of characters not in ct.

• Modify parseLine.c as follows:
  • If the number of command line arguments is incorrect, output a Usage message and exit.
  • Use the command line argument as a filename. Open the file for reading.
  • Read the file one line at a time until end-of-file using fgets.
  • Output the line number in the source code followed by the input line to standard output.
  • Process each line as follows:
    • Use strtok to peel off the tokens one at a time.
    • Output each token on a separate line along with the type of token it is.

Revision Date: 2/28/97