mirror of https://github.com/cc65/cc65.git
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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int Open (const char* Name, int Flags)
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{
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int fd;
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printf ("Opening %s: ", Name);
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fd = open (Name, Flags);
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printf ("%d\n", fd);
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return fd;
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}
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void Write (int fd, const void* Buf, unsigned Size)
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{
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int Res;
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Res = write (fd, Buf, Size);
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printf ("Writing %u bytes to %d: %d\n", Size, fd, Res);
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}
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int Read (int fd, void* Buf, unsigned Size)
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{
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int Res;
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Res = read (fd, Buf, Size);
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printf ("Reading %u bytes from %d: %d\n", Size, fd, Res);
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return Res > 0? Res : 0;
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}
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void Close (int fd)
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{
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printf ("Closing %d: %d\n", fd, close (fd));
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}
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int main (void)
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{
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int fd1, fd2;
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int Res;
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static const char text1[] = "This goes into file #1\n";
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static const char text2[] = "This goes into file #2\n";
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static const char text3[] = "This goes into file #3\n";
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static const char text4[] = "This goes into file #4\n";
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static char Buf[200];
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fd1 = Open ("foobar1", O_WRONLY|O_CREAT|O_TRUNC);
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fd2 = Open ("foobar2", O_WRONLY|O_CREAT|O_TRUNC);
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Write (fd1, text1, sizeof (text1) - 1);
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Write (fd2, text2, sizeof (text2) - 1);
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Write (fd1, text1, sizeof (text1) - 1);
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Write (fd2, text2, sizeof (text2) - 1);
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Close (fd1);
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Close (fd2);
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fd1 = Open ("foobar3", O_WRONLY|O_CREAT|O_TRUNC);
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fd2 = Open ("foobar4", O_WRONLY|O_CREAT|O_TRUNC);
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Write (fd1, text3, sizeof (text3) - 1);
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Write (fd2, text4, sizeof (text4) - 1);
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Write (fd1, text3, sizeof (text3) - 1);
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Write (fd2, text4, sizeof (text4) - 1);
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Close (fd1);
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Close (fd2);
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fd1 = Open ("foobar1", O_RDONLY);
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Res = Read (fd1, Buf, sizeof (Buf));
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printf ("%.*s", Res, Buf);
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Res = Read (fd1, Buf, sizeof (Buf));
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Close (fd1);
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return 0;
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}
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