Detect asprintf's ENOMEM in procfs.c rather than everywhere

* procfs.h: Make CONTENTS_LEN an ssize_t rather than a size_t,
  and document the change.
* procfs.c (procfs_get_contents): Initialize CONTENTS_LEN to a
  negative value, and fail with ENOMEM if it's still negative after the
  callback returns.  (everywhere): Update to ssize_t.
* dircat.c, netfs.c, process.c,
  procfs_dir.c, proclist.c, rootdir.c: Update to
  ssize_t and the new GET_CONTENTS semantics.

1 files changed, 2 insertions, 2 deletions

diff --git a/dircat.c b/dircat.c
index 93bb2fed..bb66508a 100644
--- a/dircat.c
+++ b/dircat.c
@@ -8,7 +8,7 @@ struct dircat_node
 };
 
 static error_t
-dircat_get_contents (void *hook, char **contents, size_t *contents_len)
+dircat_get_contents (void *hook, char **contents, ssize_t *contents_len)
 {
   struct dircat_node *dcn = hook;
   int i, sz, pos;
@@ -20,7 +20,7 @@ dircat_get_contents (void *hook, char **contents, size_t *contents_len)
   for (i=0; dcn->dirs[i]; i++)
     {
       char *subcon;
-      size_t sublen;
+      ssize_t sublen;
 
       err = procfs_get_contents (dcn->dirs[i], &subcon, &sublen);
       if (err)