Add some comments to snap.c - dedup - deduplicating backup program
 (HTM) git clone git://bitreich.org/dedup/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/dedup/
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       ---
 (DIR) commit d96224299eea385265b405cc59a3b4881e75d69c
 (DIR) parent fb016d2858d1d77359c56f4d67070fc8386879b6
 (HTM) Author: sin <sin@2f30.org>
       Date:   Sun,  5 May 2019 21:17:32 +0100
       
       Add some comments to snap.c
       
       Diffstat:
         M snap.c                              |      16 ++++++++--------
       
       1 file changed, 8 insertions(+), 8 deletions(-)
       ---
 (DIR) diff --git a/snap.c b/snap.c
       @@ -20,15 +20,15 @@
        #define NERRBUF        128
        
        struct mdnode {
       -        unsigned char md[MDSIZE];
       -        SLIST_ENTRY(mdnode) e;
       +        unsigned char md[MDSIZE];        /* hash of block */
       +        SLIST_ENTRY(mdnode) e;                /* mdhead link node */
        };
        
        struct sctx {
       -        SLIST_HEAD(mdhead, mdnode) mdhead;
       -        struct mdnode *mdnext;
       -        int fd;
       -        int rdonly;
       +        SLIST_HEAD(mdhead, mdnode) mdhead;        /* list of hashes contained in snapshot */
       +        struct mdnode *mdnext;        /* next hash to be returned via sget() */
       +        int fd;                /* underlying snapshot file descriptor */
       +        int rdonly;        /* when set to 1, the ssync() operation is a no-op */
        };
        
        static char errbuf[NERRBUF];
       @@ -45,7 +45,7 @@ loadmd(struct sctx *sctx)
                }
                if (xread(sctx->fd, mdnode->md, MDSIZE) != MDSIZE) {
                        free(mdnode);
       -                sseterr("failed to read message digest: %s", strerror(errno));
       +                sseterr("failed to read block hash: %s", strerror(errno));
                        return -1;
                }
                SLIST_INSERT_HEAD(&sctx->mdhead, mdnode, e);
       @@ -224,7 +224,7 @@ ssync(struct sctx *sctx)
                }
                SLIST_FOREACH(mdnode, &sctx->mdhead, e) {
                        if (xwrite(sctx->fd, mdnode->md, MDSIZE) != MDSIZE) {
       -                        sseterr("failed to write message digest: %s",
       +                        sseterr("failed to write block hash: %s",
                                        strerror(errno));
                                return -1;
                        }