CMDLINE

#include

int main (int argc, char *argv[]) { int i=0; printf(" cmdline args count=%d", argc);

/* First argument is executable name only */ printf(" exe name=%s", argv[0]);

for (i=1; i< argc; i++) { printf(" arg%d=%s", i, argv[i]); }

printf(" "); return 0; }

GETOPT

/* example of command line parsing via getopt usage: getopt [-dmp] -f fname [-s sname] name [name ...]

Paul Krzyzanowski */

#include #include

int debug = 0;

int main(int argc, char **argv) { extern char *optarg; extern int optind; int c, err = 0; int mflag=0, pflag=0, fflag = 0, sflag=0; char *sname = "default_sname", *fname; static char usage[] = "usage: %s [-dmp] -f fname [-s sname] name [name ...] ";

while ((c = getopt(argc, argv, "df:mps:")) != -1) switch (c) { case 'd': debug = 1; break; case 'm': mflag = 1; break; case 'p': pflag = 1; break; case 'f': fflag = 1; fname = optarg; break; case 's': sflag = 1; sname = optarg; break; case '?': err = 1; break; } if (fflag == 0) { /* -f was mandatory */ fprintf(stderr, "%s: missing -f option ", argv[0]); fprintf(stderr, usage, argv[0]); exit(1); } else if ((optind+1) > argc) { /* need at least one argument (change +1 to +2 for two, etc. as needeed) */

printf("optind = %d, argc=%d ", optind, argc); fprintf(stderr, "%s: missing name ", argv[0]); fprintf(stderr, usage, argv[0]); exit(1); } else if (err) { fprintf(stderr, usage, argv[0]); exit(1); } /* see what we have */ printf("debug = %d ", debug); printf("pflag = %d ", pflag); printf("mflag = %d ", mflag); printf("fname = \"%s\" ", fname); printf("sname = \"%s\" ", sname); if (optind < argc) /* these are the arguments after the command-line options */ for (; optind < argc; optind++) printf("argument: \"%s\" ", argv[optind]); else { printf("no arguments left to process "); } exit(0); }

Download sample programs from module 2 for getopt. the two ^^^^^^^

Unzip them into a folder on your computer.

Add the line #include at the top of the getopt.c file with the other includes.

Make a copy of getopt.c and call it activity.c

Create a Makefile to compile the activity program.

Modify activity.c for the following usage:

Usage: activity [-r] -b bval value [value ...]

Where the -r option is optional

The -b option is required and needs an argument to go with it called bval which is a string

At least one value is included but there may be more than one. The value(s) are also strings

The program should print out all the flags and values at the end so it should be modified throughout to match the new usage.