#include "args-strings.h" #include #include #include // Function that the auto-grader u

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Include Args Strings H Include Stdlib H Include String H Include Unistd H Function That The Auto Grader U 1 (81.15 KiB) Viewed 20 times

#include "args-strings.h" #include <stdlib.h> #include <string.h> #include <unistd.h> // Function that the auto-grader uses to reset getopt() // Don't worry about it // (I mean, feel free to mess with it, but you'll fail the auto-grader tests.) void reset_getopt() { optind = 1; } // Process command line arguments for a wc-like program // @param argc: number of command line arguments, including the program name // @param argv: array of pointers to strings, one for each argument // @param cflag: address of a 0/1 integer variable - an output of the function // @param wflag: address of a 0/1 integer variable - an output of the function // @param nflag: address of a 0/1 integer variable an output of the function // @param lflag: address of a 0/1 integer variable - an output of the function // @param outfile: address of a FILE * variable an output of the function // @param name_len: address of an int variable an output of the function void parse_args(int argc, char *argv[], int *cflag, int *wflag, int *nflag, int *lflag, FILE **outfile, int *name_len) { //TODO // using the getopt library routine, process the command line // arguments given by argc and argv, looking for these options: // -c, -W, -n, -1: set the corresponding flag's int variable to 1 // -o name: try to open for output a FILE with the given name; if that // fails, print to stderr "Error opening output file: xxx\n" where xxx is the name of the file, then exit (not return) // -f nnn: set the name_len's int to the integer value given by nnn; you may use the atoi library function to do the necessary conversion // Default values: // If none of -c, -W, -n, and -1 are given, set cflag, wflag, and lflag // (i.e., set the int variable to 1), and unset Iflag (value (). It is // probably easiest to (1) set all the flags' ints to 0 at the beginning; // (2) set individual flags as they are encountered, also remembering if // any have been set; and (3) check for the default case after the // argument processing loop. // If -o is not given, the default output FILE * is for outfile is stdout. // If -f is not given, the default value for name_len is 20. // For outfile and name_len, it is probably easiest to set their default at // the beginning. That way no later check is required. return; h