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Refactor the code that counts the last log version to keep

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When silencing the Coverity warning in remove_old_tsversions(), the code
was refactored to reduce the indentation levels and break down the long
code into individual functions.  This improve fix for [GL #1989].
This commit is contained in:
Mark Andrews
2020-07-20 11:53:40 +10:00
parent d9f862337a
commit aca18b8b5b
1 changed files with 56 additions and 40 deletions
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96
lib/isc/log.c
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@@ -1102,13 +1102,67 @@ greatest_version(isc_logfile_t *file, int versions, int *greatestp) {
return (ISC_R_SUCCESS);
}
static void
insert_sort(int64_t to_keep[], int64_t versions, int version) {
int i = 0;
while (i < versions && version < to_keep[i]) {
i++;
}
if (i == versions) {
return;
}
if (i < versions - 1) {
memmove(&to_keep[i + 1], &to_keep[i],
sizeof(to_keep[0]) * (versions - i - 1));
}
to_keep[i] = version;
}
static int64_t
last_to_keep(int64_t versions, isc_dir_t *dirp, char *bname, size_t bnamelen) {
if (versions <= 0) {
return INT64_MAX;
}
int64_t to_keep[ISC_LOG_MAX_VERSIONS] = { 0 };
int64_t version = 0;
if (versions > ISC_LOG_MAX_VERSIONS) {
versions = ISC_LOG_MAX_VERSIONS;
}
/*
* First we fill 'to_keep' structure using insertion sort
*/
memset(to_keep, 0, sizeof(to_keep));
while (isc_dir_read(dirp) == ISC_R_SUCCESS) {
if (dirp->entry.length <= bnamelen ||
strncmp(dirp->entry.name, bname, bnamelen) != 0 ||
dirp->entry.name[bnamelen] != '.')
{
continue;
}
char *digit_end;
char *ename = &dirp->entry.name[bnamelen + 1];
version = strtoull(ename, &digit_end, 10);
if (*digit_end == '\0') {
insert_sort(to_keep, versions, version);
}
}
isc_dir_reset(dirp);
/*
* to_keep[versions - 1] is the last one we want to keep
*/
return (to_keep[versions - 1]);
}
static isc_result_t
remove_old_tsversions(isc_logfile_t *file, int versions) {
isc_result_t result;
char *bname, *digit_end;
const char *dirname;
int64_t version, last = INT64_MAX;
int64_t to_keep[ISC_LOG_MAX_VERSIONS];
size_t bnamelen;
isc_dir_t dir;
char sep = '/';
@@ -1155,45 +1209,7 @@ remove_old_tsversions(isc_logfile_t *file, int versions) {
return (result);
}
if (versions > 0) {
if (versions > ISC_LOG_MAX_VERSIONS) {
versions = ISC_LOG_MAX_VERSIONS;
}
/*
* First we fill 'to_keep' structure using insertion sort
*/
memset(to_keep, 0, sizeof(to_keep));
while (isc_dir_read(&dir) == ISC_R_SUCCESS) {
if (dir.entry.length > bnamelen &&
strncmp(dir.entry.name, bname, bnamelen) == 0 &&
dir.entry.name[bnamelen] == '.')
{
char *ename = &dir.entry.name[bnamelen + 1];
version = strtoull(ename, &digit_end, 10);
if (*digit_end == '\0') {
int i = 0;
while (i < versions &&
version < to_keep[i]) {
i++;
}
if (i < versions) {
memmove(&to_keep[i + 1],
&to_keep[i],
sizeof(to_keep[0]) *
(versions - i -
1));
to_keep[i] = version;
}
}
}
}
/*
* to_keep[versions - 1] is the last one we want to keep
*/
last = to_keep[versions - 1];
isc_dir_reset(&dir);
}
last = last_to_keep(versions, &dir, bname, bnamelen);
/*
* Then we remove all files that we don't want to_keep