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dirent-util: add FOREACH macro for iterating through getdents64() buffers

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We already have a similar loop twice, let's make it easier to read via
an iteration macro.

(The new macro is a bit more careful even, as it verifies the full
dirent fits into the remaining buffer when returning it)
This commit is contained in:
Lennart Poettering
2021-10-25 21:51:37 +02:00
parent ca664db258
commit a4e70ef7ba
3 changed files with 10 additions and 10 deletions
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src/basic/dirent-util.h
+5
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@@ -51,3 +51,8 @@ assert_cc(offsetof(struct dirent, d_type) == offsetof(struct dirent64, d_type));
assert_cc(sizeof_field(struct dirent, d_type) == sizeof_field(struct dirent64, d_type));
assert_cc(offsetof(struct dirent, d_name) == offsetof(struct dirent64, d_name));
assert_cc(sizeof_field(struct dirent, d_name) == sizeof_field(struct dirent64, d_name));
#define FOREACH_DIRENT_IN_BUFFER(de, buf, sz) \
for (void *_end = (uint8_t*) ({ (de) = (buf); }) + (sz); \
(uint8_t*) (de) < (uint8_t*) _end; \
(de) = (struct dirent*) ((uint8_t*) (de) + (de)->d_reclen))