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| int main(int argc, char* argv[])
{
const struct option long_options[]= /*to specify long options*/
{
{"help",0,NULL,'h'},
{"version",0,NULL,'V'},
{"verbose",0,NULL,'v'},
{"output",1,NULL,'o'},/*output has an argument in which results
will be stored*/
{"generate",2,NULL,'g'},/*optional size argument, default=9*/
{NULL,0,NULL,0}
};
program_name=basename(argv[0]);
out_file=stdout;
int optc;
while ((optc=getopt_long(argc, argv, "hVvo:g::",long_options,NULL))!=-1)
{
switch(optc) /*to consider the different options*/
{
case 'h':
usage(EXIT_SUCCESS);
break;
case 'V':
version();
break;
case 'v':
verbose=true;
break;
case 'o':
out_file=fopen(optarg,"w+");
if (out_file==NULL) /*to treat the case when the file can't
be opened*/
{
fprintf(stderr,"Error : the file %s cannot be opened !\n",optarg);
usage(EXIT_FAILURE);
}
break;
case 'g':
if(optarg)
{
grid_size=atoi(optarg);
fprintf(out_file,"argument %s\n",optarg);
}
else
{
grid_size = 9;
fprintf(out_file,"size = %d\n",grid_size);
}
fprintf(out_file,"option g\n");
break;
default:
usage(EXIT_FAILURE);
}
}
if (optind>=argc) /*tests the presence of argument in line command*/
usage(EXIT_FAILURE);
FILE* grid_file;
grid_file=fopen(argv[optind],"r");
if(grid_file==NULL)
{
fprintf(stderr,"Error : the file %s cannot be opened !\n",argv[optind]);
usage(EXIT_FAILURE);
} |
