autoconf: Checks for libraries

diff --git a/csum-file.c b/csum-file.c
index 5f9249aeedfa7d4156cf412da6a7e7d77f33ff86..ebaad0397f0bce50db7542abb904ba42b6173344 100644 (file)
--- a/csum-file.c
+++ b/csum-file.c
@@ -17,7 +17,7 @@ static int sha1flush(struct sha1file *f, unsigned int count)
        for (;;) {
                int ret = xwrite(f->fd, buf, count);
                if (ret > 0) {
-                       buf += ret;
+                       buf = (char *) buf + ret;
                        count -= ret;
                        if (count)
                                continue;
@@ -57,7 +57,7 @@ int sha1write(struct sha1file *f, void *buf, unsigned int count)
                memcpy(f->buffer + offset, buf, nr);
                count -= nr;
                offset += nr;
-               buf += nr;
+               buf = (char *) buf + nr;
                left -= nr;
                if (!left) {
                        SHA1_Update(&f->ctx, f->buffer, offset);