Running it does not open the file that i'm parsing with optarg in option -w.
I run with ./programname -w filename.txt
filename.txt is in the same directory with exe file etc...
I post here a part of code to let you understand, thank you!
P.S. Sorry for my bad english!
while((opt = getopt(argc, argv, "lw")) != -1)
switch(opt) {
case 'l': {
//... do something ...
} break;
case 'w': {
int counter = 0;
FILE* ifp = fopen(optarg, "r");
CHECK_OPEN_FILE(ifp, optarg);
while(fgets(buffer, 256, ifp) != NULL)
counter += wordscounter(buffer);
fprintf(stdout, "File has %d words.\n", counter);
fclose(ifp);
}break;
case '?': {
if(optopt == '-')
break;
fprintf(stderr, "ERROR: Option -%c unrecognized...\n", optopt);
} break;
}
In this part of code i have a problem:
FILE* ifp = fopen(optarg, "r");
CHECK_OPEN_FILE(ifp, optarg);
If such a character is followed by a colon, the option requires an argument
You are missing : for option w. You should have lw: specifying that w has a value. Else optarg is null