Mega Code Archive
Create 1 MB test garbage file
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define PACKAGE "garfile"
#define MB 1024 * 1024
void print_help(int exval);
int main(int argc, char *argv[]) {
int opt = 0;
char *mptr;
int fd = -1;
int megabyte = MB;
if(argc == 1)
print_help(1);
/* option parser */
while((opt = getopt(argc, argv, "h")) != -1) {
switch(opt) {
case 'h':
print_help(0);
case '?': /* no such option */
fprintf(stderr, "%s: Error - No such option: `%c'\n\n", PACKAGE, optopt);
print_help(1);
}
}
if((argc - optind) == 0)
print_help(1);
for(; optind < argc; optind++) {
if((mptr = malloc(megabyte)) == NULL) {
fprintf(stderr, "%s: Error - malloc(%d)\n", PACKAGE, megabyte);
return 1;
}
memset(mptr, '\0', sizeof(mptr));
if((fd = open(argv[optind], O_RDWR|O_CREAT|O_TRUNC, 0666)) == -1) {
fprintf(stderr, "%s: Error - open(%s)\n", PACKAGE, argv[optind]);
return 1;
}
write(fd, mptr, megabyte);
close(fd);
}
free(mptr);
return 0;
}
/* status epilepticus, print help and exit with exval */
void print_help(int exval) {
printf("%s create a test file filled with `\\0' of 1 Megabyte in size\n", PACKAGE);
printf("Usage: %s [-h] FILE1 FILE2 FILE3...\n\n", PACKAGE);
printf(" -h print this help and exit\n\n");
exit(exval);
}
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