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options.c
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options.c
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#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "getopt.h"
#ifdef LALIB
#include "la_flag.h"
#else
#include "flag.h"
#endif
void usage(const char* progname)
{
fprintf(stderr, "%s -o output_file -f -n array_size\n"
" -f tells it to print compiler options\n"
" -o is optional\n"
" -n array_size required for computation.\n", progname);
exit(0);
}
void options(int argc, char** argv,size_t* n, char** outfile)
{
int opt_char = 0;
int output_file_len = 0;
char* output_file = 0;
char* endptr = 0;
size_t array_size = 0;
*outfile = 0;
if (argc<2) usage(argv[0]);
while (1) {
opt_char = getopt(argc,argv,"o:fn:h");
if (-1==opt_char) break;
switch (opt_char) {
case 'h':
usage(argv[0]);
break;
case 'o':
output_file_len = strlen(optarg)+1;
output_file = (char*) malloc(output_file_len);
strncpy(output_file,optarg,output_file_len);
*outfile = output_file;
break;
case 'f':
printf("%s %s\n",argv[0], g_flag);
break;
case 'n':
errno = 0;
array_size = strtoul(optarg, &endptr, 10);
if (0!=errno || endptr == optarg) {
fprintf(stderr, "The array size should be a positive integer.");
} else {
*n = array_size;
}
break;
default:
printf("unknown option\n");
break;
}
}
if (0==array_size) {
exit(0);
}
}