Heya,
Just trying to get a little help on some excercises I need to do, Done 14/15 fine, but stuck on 15th and not sure quite whats wrong.
Need to do a systemcall from C program to copy a file, using stat, open, read write and close.
So far I've done this:
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
int main(int argc, char *argv[]) {
struct stat TestFile;
int FileMode, FileMode2;
char line[2000];
printf("You have asked to read: %s\n", argv[1]);
if (stat(argv[2], &TestFile) == -1 && errno == ENOENT)
{
printf("Secondary name doesn't exist, Proceeding.");
}
else
{
printf("Error");
}
if (stat(argv[1], &TestFile) == -1 && errno == ENOENT) // Checks if file exists, and if valid name
{
printf ("File %s doesn't exist.\n", argv[1]);
}
else
{
if (stat(argv[1], &TestFile) == -1)
{
printf ("Invalid name %s.\n", argv[1]); // If invalid name report
}
else
{
printf ("File %s exists.\n", argv[1]); // If it already exists report
FileMode = open(argv[1], O_RDONLY); // Opens read only file
FileMode2 = open(argv[2], O_WRONLY|O_APPEND|O_CREAT, S_IRWXU); //Creates file
read(FileMode, line, 1024); // Read file .
fprintf(stdout, line); // Outputs to stdout
write(FileMode2, line, 1024); // Writes to file
close(FileMode2); // Closes File
close(FileMode); // Closes File
}
}
return(0);
}It copies a file and puts "something" into it, but I can't open the file as it complains about its character encoding :<
I wonder if it's due to my read/write statement being 1024 length, rather than looping a single bit around, but that doesn't seem to work either :<
Any help would be appreciated.
Thanks Steph