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Utility function to seek in MIME trees in depth-first order.

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This function matches how we number parts for the --part argument to
show.  It will allow us to jump directly to the desired part, rather
than traversing the entire tree and carefully tracking whether or not
we're "in the zone".
This commit is contained in:
Austin Clements 2011-12-24 13:52:45 -05:00 committed by David Bremner
parent bb189220a3
commit 5d1ac7d1d3
2 changed files with 32 additions and 0 deletions
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27
mime-node.c
View file

@ -236,3 +236,30 @@ mime_node_child (const mime_node_t *parent, int child)
}
return _mime_node_create (parent, sub);
}
static mime_node_t *
_mime_node_seek_dfs_walk (mime_node_t *node, int *n)
{
mime_node_t *ret = NULL;
int i;
if (*n == 0)
return node;
*n -= 1;
for (i = 0; i < node->nchildren && !ret; i++) {
mime_node_t *child = mime_node_child (node, i);
ret = _mime_node_seek_dfs_walk (child, n);
if (!ret)
talloc_free (child);
}
return ret;
}
mime_node_t *
mime_node_seek_dfs (mime_node_t *node, int n)
{
if (n < 0)
return NULL;
return _mime_node_seek_dfs_walk (node, &n);
}

5
notmuch-client.h
View file

@ -324,5 +324,10 @@ mime_node_open (const void *ctx, notmuch_message_t *message,
mime_node_t *
mime_node_child (const mime_node_t *parent, int child);
/* Return the nth child of node in a depth-first traversal. If n is
* 0, returns node itself. Returns NULL if there is no such part. */
mime_node_t *
mime_node_seek_dfs (mime_node_t *node, int n);
#include "command-line-arguments.h"
#endif