summaryrefslogtreecommitdiff
path: root/lib/fstree/sort_by_file.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/fstree/sort_by_file.c')
-rw-r--r--lib/fstree/sort_by_file.c366
1 files changed, 366 insertions, 0 deletions
diff --git a/lib/fstree/sort_by_file.c b/lib/fstree/sort_by_file.c
new file mode 100644
index 0000000..7d3f5cc
--- /dev/null
+++ b/lib/fstree/sort_by_file.c
@@ -0,0 +1,366 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * sort_by_file.c
+ *
+ * Copyright (C) 2021 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include "fstree.h"
+#include "compat.h"
+
+#include "sqfs/block.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+static int decode_priority(const char *filename, size_t line_no,
+ char *line, sqfs_s64 *priority)
+{
+ bool negative = false;
+ size_t i = 0;
+
+ if (line[0] == '-') {
+ negative = true;
+ i = 1;
+ }
+
+ if (!isdigit(line[i]))
+ goto fail_number;
+
+ *priority = 0;
+
+ for (; isdigit(line[i]); ++i) {
+ sqfs_s64 x = line[i] - '0';
+
+ if ((*priority) >= ((0x7FFFFFFFFFFFFFFFL - x) / 10L))
+ goto fail_ov;
+
+ (*priority) = (*priority) * 10 + x;
+ }
+
+ if (!isspace(line[i]))
+ goto fail_filename;
+
+ while (isspace(line[i]))
+ ++i;
+
+ if (line[i] == '\0')
+ goto fail_filename;
+
+ if (negative)
+ (*priority) = -(*priority);
+
+ memmove(line, line + i, strlen(line + i) + 1);
+ return 0;
+fail_number:
+ fprintf(stderr, "%s: " PRI_SZ ": Line must start with "
+ "numeric sort priority.\n",
+ filename, line_no);
+ return -1;
+fail_ov:
+ fprintf(stderr, "%s: " PRI_SZ ": Numeric overflow in sort priority.\n",
+ filename, line_no);
+ return -1;
+fail_filename:
+ fprintf(stderr, "%s: " PRI_SZ ": Expacted `<space> <filename>` "
+ "after sort priority.\n",
+ filename, line_no);
+ return -1;
+}
+
+static int decode_filename(const char *filename, size_t line_no, char *buffer)
+{
+ char *src, *dst;
+
+ if (buffer[0] == '"') {
+ src = buffer + 1;
+ dst = buffer;
+
+ for (;;) {
+ if (src[0] == '\0')
+ goto fail_match;
+
+ if (src[0] == '"') {
+ ++src;
+ break;
+ }
+
+ if (src[0] == '\\') {
+ switch (src[1]) {
+ case '\\':
+ *(dst++) = '\\';
+ src += 2;
+ break;
+ case '"':
+ *(dst++) = '"';
+ src += 2;
+ break;
+ default:
+ goto fail_escape;
+ }
+ } else {
+ *(dst++) = *(src++);
+ }
+ }
+
+ if (*src != '\0')
+ return -1;
+ }
+
+ if (canonicalize_name(buffer))
+ goto fail_canon;
+ return 0;
+fail_canon:
+ fprintf(stderr, "%s: " PRI_SZ ": Malformed filename.\n",
+ filename, line_no);
+ return -1;
+fail_escape:
+ fprintf(stderr, "%s: " PRI_SZ ": Unknown escape sequence `\\%c` "
+ "in filename.\n", filename, line_no, src[1]);
+ return -1;
+fail_match:
+ fprintf(stderr, "%s: " PRI_SZ ": Unmatched '\"' in filename.\n",
+ filename, line_no);
+ return -1;
+}
+
+static int decode_flags(const char *filename, size_t line_no, bool *do_glob,
+ bool *path_glob, int *flags, char *line)
+{
+ char *start = line;
+
+ *do_glob = false;
+ *path_glob = false;
+ *flags = 0;
+
+ if (*(line++) != '[')
+ return 0;
+
+ for (;;) {
+ while (isspace(*line))
+ ++line;
+
+ if (*line == ']') {
+ ++line;
+ break;
+ }
+
+ if (strncmp(line, "glob_no_path", 12) == 0) {
+ line += 12;
+ *do_glob = true;
+ *path_glob = false;
+ } else if (strncmp(line, "glob", 4) == 0) {
+ line += 4;
+ *do_glob = true;
+ *path_glob = true;
+ } else if (strncmp(line, "dont_fragment", 13) == 0) {
+ line += 13;
+ (*flags) |= SQFS_BLK_DONT_FRAGMENT;
+ } else if (strncmp(line, "align", 5) == 0) {
+ line += 5;
+ (*flags) |= SQFS_BLK_ALIGN;
+ } else if (strncmp(line, "dont_compress", 13) == 0) {
+ line += 13;
+ (*flags) |= SQFS_BLK_DONT_COMPRESS;
+ } else if (strncmp(line, "dont_deduplicate", 16) == 0) {
+ line += 16;
+ (*flags) |= SQFS_BLK_DONT_DEDUPLICATE;
+ } else if (strncmp(line, "nosparse", 8) == 0) {
+ line += 8;
+ (*flags) |= SQFS_BLK_IGNORE_SPARSE;
+ } else {
+ goto fail_flag;
+ }
+
+ while (isspace(*line))
+ ++line;
+
+ if (*line == ']') {
+ ++line;
+ break;
+ }
+
+ if (*(line++) != ',')
+ goto fail_sep;
+ }
+
+ if (!isspace(*line))
+ goto fail_fname;
+
+ while (isspace(*line))
+ ++line;
+
+ memmove(start, line, strlen(line) + 1);
+ return 0;
+fail_fname:
+ fprintf(stderr, "%s: " PRI_SZ ": Expected `<space> <filename>` "
+ "after flag list.\n", filename, line_no);
+ return -1;
+fail_sep:
+ fprintf(stderr, "%s: " PRI_SZ ": Unexpected '%c' after flag.\n",
+ filename, line_no, *line);
+ return -1;
+fail_flag:
+ fprintf(stderr, "%s: " PRI_SZ ": Unknown flag `%.3s...`.\n",
+ filename, line_no, line);
+ return -1;
+}
+
+static void sort_file_list(fstree_t *fs)
+{
+ file_info_t *out = NULL, *out_last = NULL;
+
+ while (fs->files != NULL) {
+ sqfs_s64 lowest = fs->files->priority;
+ file_info_t *it, *prev;
+
+ for (it = fs->files; it != NULL; it = it->next) {
+ if (it->priority < lowest)
+ lowest = it->priority;
+ }
+
+ it = fs->files;
+ prev = NULL;
+
+ while (it != NULL) {
+ if (it->priority != lowest) {
+ prev = it;
+ it = it->next;
+ continue;
+ }
+
+ if (prev == NULL) {
+ fs->files = it->next;
+ } else {
+ prev->next = it->next;
+ }
+
+ if (out == NULL) {
+ out = it;
+ } else {
+ out_last->next = it;
+ }
+
+ out_last = it;
+ it = it->next;
+ out_last->next = NULL;
+ }
+ }
+
+ fs->files = out;
+}
+
+int fstree_sort_files(fstree_t *fs, istream_t *sortfile)
+{
+ const char *filename;
+ size_t line_num = 1;
+ file_info_t *it;
+
+ for (it = fs->files; it != NULL; it = it->next) {
+ it->priority = 0;
+ it->flags = 0;
+ it->already_matched = false;
+ }
+
+ filename = istream_get_filename(sortfile);
+
+ for (;;) {
+ bool do_glob, path_glob, have_match;
+ char *line = NULL;
+ sqfs_s64 priority;
+ int ret, flags;
+
+ ret = istream_get_line(sortfile, &line, &line_num,
+ ISTREAM_LINE_LTRIM |
+ ISTREAM_LINE_RTRIM |
+ ISTREAM_LINE_SKIP_EMPTY);
+ if (ret != 0) {
+ free(line);
+ if (ret < 0)
+ return -1;
+ break;
+ }
+
+ if (line[0] == '#') {
+ free(line);
+ continue;
+ }
+
+ if (decode_priority(filename, line_num, line, &priority)) {
+ free(line);
+ return -1;
+ }
+
+ if (decode_flags(filename, line_num, &do_glob, &path_glob,
+ &flags, line)) {
+ free(line);
+ return -1;
+ }
+
+ if (decode_filename(filename, line_num, line)) {
+ free(line);
+ return -1;
+ }
+
+ have_match = false;
+
+ for (it = fs->files; it != NULL; it = it->next) {
+ tree_node_t *node;
+ char *path;
+
+ if (it->already_matched)
+ continue;
+
+ node = container_of(it, tree_node_t, data.file);
+ path = fstree_get_path(node);
+ if (path == NULL) {
+ fprintf(stderr, "%s: " PRI_SZ ": out-of-memory\n",
+ filename, line_num);
+ free(line);
+ return -1;
+ }
+
+ if (canonicalize_name(path)) {
+ fprintf(stderr,
+ "%s: " PRI_SZ ": [BUG] error "
+ "reconstructing node path\n",
+ filename, line_num);
+ free(line);
+ return -1;
+ }
+
+ if (do_glob) {
+ ret = fnmatch(line, path,
+ path_glob ? FNM_PATHNAME : 0);
+
+ } else {
+ ret = strcmp(path, line);
+ }
+
+ free(path);
+
+ if (ret == 0) {
+ have_match = true;
+ it->flags = flags;
+ it->priority = priority;
+ it->already_matched = true;
+
+ if (!do_glob)
+ break;
+ }
+ }
+
+ if (!have_match) {
+ fprintf(stderr, "WARNING: %s: " PRI_SZ ": no match "
+ "for '%s'.\n",
+ filename, line_num, line);
+ }
+
+ free(line);
+ }
+
+ sort_file_list(fs);
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 00:23:33 +0000