Added tee!

It supports all the POSIX flags! (-i and -a)

1 files changed, 60 insertions, 0 deletions

diff --git a/src/tee.c b/src/tee.c
new file mode 100644
index 0000000..7fc888a
--- /dev/null
+++ b/src/tee.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <signal.h>
+#include <errno.h>
+#include <string.h>
+
+int
+tee(int fd)
+{
+  if(fd == -1)
+    {
+      fprintf(stderr,"%s\n",strerror(errno));
+      return 1;
+    }
+  char buf[8192];
+  int read_bytes = 0;
+  while((read_bytes = read(0,buf,8192)) > 0)
+    write(fd,buf,read_bytes);
+  return 1;
+}
+
+int
+main(int argc, char *argv[])
+{
+  int c;
+  int append = 0;
+  int ignore_signt = 0;
+  int fd = 0;
+  int FLAGS = O_WRONLY; /* POSIX is a bit dumb, god knows why
+                                    this is not the same as O_RDWR */
+  while((c = getopt(argc, argv,"ai")) != -1)
+    {
+      switch(c)
+        {
+        case 'a': append = 1; break;
+        case 'i': ignore_signt = 1; break;
+        }
+    }
+  if(argc == optind)
+    {
+      if(ignore_signt)
+        signal(SIGINT,SIG_IGN);
+      tee(1);
+    }
+  else
+    {
+      if(argv[argc-1][0] == '-')
+        fd = 1;
+      if(append)
+	FLAGS = O_RDWR|O_APPEND;
+
+      fd = open(argv[argc-1],FLAGS);
+      if(ignore_signt)
+        signal(SIGINT,SIG_IGN);
+      if(tee(fd) == 1)
+        return -1;
+    }
+  return 0;
+}