////
// scan_opts
//
// Uses getopt() to scan options from the command line. Sets
// necessary flags. Prints an error message for incorrect options.
//
void scan_opts (int argc, char **argv, struct options *options) {
int option;
opterr = 0;
for(;;) {
option = getopt (argc, argv, "s:v:r");
if (option == EOF) break;
switch (option) {
case 's': options->server = TRUE;
options->serverIP = optarg; break;
case 'v': options->vote = TRUE;
options->candidateName = optarg;
options->voterID = argv[argc - 1]; break;
case 'r': options->results = TRUE; break;
default: errprintf ("%:bad option (%c)\n", optopt);
options->badopt = TRUE; break;
}
}
// Print error for bad options.
if (optind > argc || options->badopt || (argc > optind + 1)) {
errprintf ("%s: %s %s %s %s %s\n", "Usage", get_execname(),
"-s[serverIP]", "-v[candidateName]", "-r",
"voterIDnumber");
error ("bad usage");
}
// there must be a voter ID number with a vote
if (options->vote && (argc != (optind + 1))) {
errprintf ("%s: %s %s %s %s %s\n", "Usage", get_execname(),
"-s[serverIP]", "-v[candidateName]", "-r",
"voterIDnumber");
error ("need voter ID number to vote");
}
// If required option -s is not present, then end program.
if (!options->server) {
errprintf ("%s: %s %s %s %s %s\n", "Usage", get_execname(),
"-s[serverIP]", "-v[candidateName]", "-r",
"voterIDnumber");
error ("no server IP");
}
// If any argument exceeds a length of 255
if ((options->serverIP != NULL && strlen (options->serverIP) > 255)
|| (options->candidateName != NULL &&
strlen (options->candidateName) > 255) ||
(options->voterID != NULL && strlen (options->voterID) > 255 ))
error ("no argument should exceed a length of 255 characters");
}
void veprintf (const char* format, va_list args) {
assert (execname != NULL);
assert (format != NULL);
fflush (NULL);
if (strstr (format, "%:") == format) {
fprintf (stderr, "%s: ", get_execname ());
format += 2;
}
vfprintf (stderr, format, args);
fflush (NULL);
}
void scanner_userinit (void) {
if (basefilename == NULL)
errprintf ("%s: %s: %s: %s: %s\n", get_execname(), "Error",
"lyutils.c", "scanner_userinit()",
"null file pointer");
char *tokname = malloc (strlen (basefilename) + strlen (".tok") + 1);
xstrcpy (tokname, basefilename);
xstrcat (tokname, ".tok");
tokfile = fopen (tokname, "w+");
free (tokname);
}
