pack-objects: Allow use of pre-generated pack.

[thirdparty/git.git] / copy.c

diff --git a/copy.c b/copy.c
new file mode 100644 (file)
index 0000000..2009275
--- /dev/null
+++ b/copy.c
@@ -0,0 +1,37 @@
+#include "cache.h"
+
+int copy_fd(int ifd, int ofd)
+{
+       while (1) {
+               int len;
+               char buffer[8192];
+               char *buf = buffer;
+               len = read(ifd, buffer, sizeof(buffer));
+               if (!len)
+                       break;
+               if (len < 0) {
+                       if (errno == EAGAIN)
+                               continue;
+                       return error("copy-fd: read returned %s",
+                                    strerror(errno));
+               }
+               while (1) {
+                       int written = write(ofd, buf, len);
+                       if (written > 0) {
+                               buf += written;
+                               len -= written;
+                               if (!len)
+                                       break;
+                       }
+                       if (!written)
+                               return error("copy-fd: write returned 0");
+                       if (errno == EAGAIN || errno == EINTR)
+                               continue;
+                       return error("copy-fd: write returned %s",
+                                    strerror(errno));
+               }
+       }
+       close(ifd);
+       return 0;
+}
+