Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers...

[reactos.git] / modules / rosapps / applications / net / ncftp / sio / PRead.c

diff --git a/modules/rosapps/applications/net/ncftp/sio/PRead.c b/modules/rosapps/applications/net/ncftp/sio/PRead.c
new file mode 100644 (file)
index 0000000..7b0e074
--- /dev/null
+++ b/modules/rosapps/applications/net/ncftp/sio/PRead.c
@@ -0,0 +1,71 @@
+#include "syshdrs.h"
+
+#if !defined(NO_SIGNALS) && defined(SIGPIPE)
+extern volatile Sjmp_buf gPipeJmp;
+#endif
+
+/* Read up to "size" bytes on sfd.
+ *
+ * If "retry" is on, after a successful read of less than "size"
+ * bytes, it will attempt to read more, upto "size."
+ *
+ * Although "retry" would seem to indicate you may want to always
+ * read "size" bytes or else it is an error, even with that on you
+ * may get back a value < size.  Set "retry" to 0 when you want to
+ * return as soon as there is a chunk of data whose size is <= "size".
+ */
+
+int
+PRead(int sfd, char *const buf0, size_t size, int retry)
+{
+       int nread;
+       volatile int nleft;
+       char *volatile buf = buf0;
+#if !defined(NO_SIGNALS) && defined(SIGPIPE)
+       vsio_sigproc_t sigpipe;
+
+       if (SSetjmp(gPipeJmp) != 0) {
+               (void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
+               nread = size - nleft;
+               if (nread > 0)
+                       return (nread);
+               errno = EPIPE;
+               return (kBrokenPipeErr);
+       }
+
+       sigpipe = (vsio_sigproc_t) SSignal(SIGPIPE, SIOHandler);
+#endif
+       errno = 0;
+
+       nleft = (int) size;
+       forever {
+               nread = read(sfd, buf, nleft);
+               if (nread <= 0) {
+                       if (nread == 0) {
+                               /* EOF */
+                               nread = size - nleft;
+                               goto done;
+                       } else if (errno != EINTR) {
+                               nread = size - nleft;
+                               if (nread == 0)
+                                       nread = -1;
+                               goto done;
+                       } else {
+                               errno = 0;
+                               nread = 0;
+                               /* Try again. */
+                       }
+               }
+               nleft -= nread;
+               if ((nleft <= 0) || (retry == 0))
+                       break;
+               buf += nread;
+       }
+       nread = size - nleft;
+
+done:
+#if !defined(NO_SIGNALS) && defined(SIGPIPE)
+       (void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
+#endif
+       return (nread);
+}      /* PRead */