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hwdb: simplify error handling in trie_store

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fclose() can also set errno, so the attempts to protect errno that the
code made were not successful. Simplify things by immediately saving
errno to r.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2016-11-29 15:27:40 -05:00
parent 1cd592b916
commit d702dcdfef
1 changed files with 18 additions and 23 deletions
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41
src/hwdb/hwdb.c
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@ -396,24 +396,21 @@ static int trie_store(struct trie *trie, const char *filename) {
.child_entry_size = htole64(sizeof(struct trie_child_entry_f)),
.value_entry_size = htole64(sizeof(struct trie_value_entry2_f)),
};
int err;
int r;
/* calculate size of header, nodes, children entries, value entries */
t.strings_off = sizeof(struct trie_header_f);
trie_store_nodes_size(&t, trie->root);
err = fopen_temporary(filename , &t.f, &filename_tmp);
if (err < 0)
return err;
r = fopen_temporary(filename , &t.f, &filename_tmp);
if (r < 0)
return r;
fchmod(fileno(t.f), 0444);
/* write nodes */
err = fseeko(t.f, sizeof(struct trie_header_f), SEEK_SET);
if (err < 0) {
fclose(t.f);
unlink_noerrno(filename_tmp);
return -errno;
}
if (fseeko(t.f, sizeof(struct trie_header_f), SEEK_SET) < 0)
goto error;
root_off = trie_store_nodes(&t, trie->root);
h.nodes_root_off = htole64(root_off);
pos = ftello(t.f);
@ -426,21 +423,14 @@ static int trie_store(struct trie *trie, const char *filename) {
/* write header */
size = ftello(t.f);
h.file_size = htole64(size);
err = fseeko(t.f, 0, SEEK_SET);
if (err < 0) {
fclose(t.f);
if (fseeko(t.f, 0, SEEK_SET) < 0)
goto error;
fwrite(&h, sizeof(struct trie_header_f), 1, t.f);
if (fclose(t.f) < 0 || rename(filename_tmp, filename) < 0) {
unlink_noerrno(filename_tmp);
return -errno;
}
fwrite(&h, sizeof(struct trie_header_f), 1, t.f);
err = ferror(t.f);
if (err)
err = -errno;
fclose(t.f);
if (err < 0 || rename(filename_tmp, filename) < 0) {
unlink_noerrno(filename_tmp);
return err < 0 ? err : -errno;
}
log_debug("=== trie on-disk ===");
log_debug("size: %8"PRIi64" bytes", size);
@ -453,8 +443,13 @@ static int trie_store(struct trie *trie, const char *filename) {
t.values_count * sizeof(struct trie_value_entry2_f), t.values_count);
log_debug("string store: %8zu bytes", trie->strings->len);
log_debug("strings start: %8"PRIu64, t.strings_off);
return 0;
error:
r = -errno;
fclose(t.f);
unlink(filename_tmp);
return r;
}
static int insert_data(struct trie *trie, char **match_list, char *line,