Re: [PATCH v2 1/8] ref-filter: avoid using `unsigned long` for catch-all data type

[Torsten Bögershausen]

On 02/04/17 21:06, Johannes Schindelin wrote:

In its `atom_value` struct, the ref-filter source code wants to store
different values in a field called `ul` (for `unsigned long`), e.g.
timestamps.

However, as we are about to switch the data type of timestamps away from
`unsigned long` (because it may be 32-bit even when `time_t` is 64-bit),
that data type is not large enough.

Simply change that field to use `uintmax_t` instead.

This patch is a bit larger than the mere change of the data type
because the field's name was tied to its data type, which has been fixed
at the same time.

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 ref-filter.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/ref-filter.c b/ref-filter.c
index 9c82b5b9d63..8538328fc7f 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -351,7 +351,7 @@ struct ref_formatting_state {
 struct atom_value {
        const char *s;
        void (*handler)(struct atom_value *atomv, struct ref_formatting_state 
*state);
-       unsigned long ul; /* used for sorting when not FIELD_STR */
+       uintmax_t value; /* used for sorting when not FIELD_STR */
        struct used_atom *atom;
 };

@@ -723,7 +723,7 @@ static void grab_common_values(struct atom_value *val, int 
deref, struct object
                if (!strcmp(name, "objecttype"))
                        v->s = typename(obj->type);
                else if (!strcmp(name, "objectsize")) {
-                       v->ul = sz;
+                       v->value = sz;
                        v->s = xstrfmt("%lu", sz);
                }
                else if (deref)
@@ -770,8 +770,8 @@ static void grab_commit_values(struct atom_value *val, int 
deref, struct object
                        v->s = xstrdup(oid_to_hex(&commit->tree->object.oid));
                }
                else if (!strcmp(name, "numparent")) {
-                       v->ul = commit_list_count(commit->parents);
-                       v->s = xstrfmt("%lu", v->ul);
+                       v->value = commit_list_count(commit->parents);
+                       v->s = xstrfmt("%lu", (unsigned long)v->value);

If we want to get rid of "%lu" at some day, we can do like this:
v->s = xstrfmt("%" PRIuMAX, v->value);
Or, to make clear that under all circumstances an unsigned long is big enough to
hold the counter, for readers in the future, use something like this:
                        v->s = xstrfmt("%lu", (xulong_t)v->value);

(this is more a reminder to myself, to send such a patch )