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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-07-01 13:23:36 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-07-01 13:23:36 +0200
commit8aea2d1dc437b5b497170ef9c1b6854aee8f5dcf (patch)
tree0999ed4664c74cf90896d8b11f7f4a9dc06e8d48 /lib/tar/read_sparse_map.c
parentf0d18050d832498c8e230c04084675455fef391f (diff)
cleanup: split tar code up, remove some duplications
This commit attempts to split some of the monolitic tar parsing code up into multiple functions in seperate files. Also, some code duplication (like reading a record into memory which was implemented twice) is removed. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/tar/read_sparse_map.c')
-rw-r--r--lib/tar/read_sparse_map.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/lib/tar/read_sparse_map.c b/lib/tar/read_sparse_map.c
new file mode 100644
index 0000000..77876f5
--- /dev/null
+++ b/lib/tar/read_sparse_map.c
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include "internal.h"
+
+sparse_map_t *read_sparse_map(const char *line)
+{
+ sparse_map_t *last = NULL, *list = NULL, *ent = NULL;
+
+ do {
+ ent = calloc(1, sizeof(*ent));
+ if (ent == NULL)
+ goto fail_errno;
+
+ if (pax_read_decimal(line, &ent->offset))
+ goto fail_format;
+
+ while (isdigit(*line))
+ ++line;
+
+ if (*(line++) != ',')
+ goto fail_format;
+
+ if (pax_read_decimal(line, &ent->count))
+ goto fail_format;
+
+ while (isdigit(*line))
+ ++line;
+
+ if (last == NULL) {
+ list = last = ent;
+ } else {
+ last->next = ent;
+ last = ent;
+ }
+ } while (*(line++) == ',');
+
+ return list;
+fail_errno:
+ perror("parsing GNU pax sparse file record");
+ goto fail;
+fail_format:
+ fputs("malformed GNU pax sparse file record\n", stderr);
+ goto fail;
+fail:
+ free_sparse_list(list);
+ free(ent);
+ return NULL;
+}