blame: show "previous" information in --porcelain/--incremental format

diff --git a/wrapper.c b/wrapper.c
index 4e04f7661b4943059243fa5f8a33baeec4a96583..93562f03eef21b26945d2d9bbdc96818f4de6567 100644 (file)
--- a/wrapper.c
+++ b/wrapper.c
@@ -133,6 +133,44 @@ ssize_t xwrite(int fd, const void *buf, size_t len)
        }
 }
 
+ssize_t read_in_full(int fd, void *buf, size_t count)
+{
+       char *p = buf;
+       ssize_t total = 0;
+
+       while (count > 0) {
+               ssize_t loaded = xread(fd, p, count);
+               if (loaded <= 0)
+                       return total ? total : loaded;
+               count -= loaded;
+               p += loaded;
+               total += loaded;
+       }
+
+       return total;
+}
+
+ssize_t write_in_full(int fd, const void *buf, size_t count)
+{
+       const char *p = buf;
+       ssize_t total = 0;
+
+       while (count > 0) {
+               ssize_t written = xwrite(fd, p, count);
+               if (written < 0)
+                       return -1;
+               if (!written) {
+                       errno = ENOSPC;
+                       return -1;
+               }
+               count -= written;
+               p += written;
+               total += written;
+       }
+
+       return total;
+}
+
 int xdup(int fd)
 {
        int ret = dup(fd);