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PERFORMANCE OPTIMIZATIONS

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This commit is contained in:
apio 2022-12-25 13:21:09 +01:00
parent 41a1e23abf
commit 555059a742
Signed by: apio
GPG Key ID: B8A7D06E42258954
1 changed files with 6 additions and 16 deletions
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22
src/util.c
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@ -58,17 +58,6 @@ static char* minitar_strndup(const char* orig, size_t max)
return ptr;
}
// Our own replacement for strdup().
// https://linux.die.net/man/3/strdup
static char* minitar_strdup(const char* orig)
{
size_t len = strlen(orig);
char* ptr = calloc(len + 1, 1);
if (!ptr) return NULL;
for (size_t i = 0; i < len; ++i) { *(ptr + i) = *(orig + i); }
return ptr;
}
static char dot[] = ".";
// POSIX function to extract the basename from a path. Not present on non-POSIX, but since paths inside a tar archive
@ -119,14 +108,13 @@ size_t minitar_align_up_to_block_size(size_t size)
static void minitar_parse_basename(const char* path, char* out, size_t max)
{
char* copy = minitar_strdup(path);
if (!copy) minitar_panic("Failed to allocate memory");
static char mutable_path_copy[512];
char* bname = minitar_basename(copy);
minitar_strlcpy(mutable_path_copy, path, sizeof(mutable_path_copy));
char* bname = minitar_basename(mutable_path_copy);
minitar_strlcpy(out, bname, max);
free(copy);
}
void minitar_parse_metadata_from_tar_header(const struct tar_header* hdr, struct minitar_entry_metadata* metadata)
@ -154,6 +142,8 @@ void minitar_parse_metadata_from_tar_header(const struct tar_header* hdr, struct
metadata->uid = (uid_t)strtoul(hdr->uid, NULL, 8);
metadata->gid = (gid_t)strtoul(hdr->gid, NULL, 8);
// FIXME: Maybe avoid heap allocations (strndup) for simply parsing non-null-terminated fields?
char* sizeptr = minitar_strndup(
hdr->size, 12); // The hdr->size field is not null-terminated, yet strndup returns a null-terminated string.
if (!sizeptr) minitar_panic("Failed to allocate memory");