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-rw-r--r--src/helper/tpax_path_copy.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/src/helper/tpax_path_copy.c b/src/helper/tpax_path_copy.c
new file mode 100644
index 0000000..0df6c17
--- /dev/null
+++ b/src/helper/tpax_path_copy.c
@@ -0,0 +1,86 @@
+/******************************************************/
+/* tpax: a topological pax implementation */
+/* Copyright (C) 2020 Z. Gilboa */
+/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */
+/******************************************************/
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+#include <tpax/tpax.h>
+#include "tpax_driver_impl.h"
+
+int tpax_path_copy(
+ char * dstpath,
+ const char * srcpath,
+ size_t bufsize,
+ uint32_t flags,
+ size_t * nwritten)
+{
+ const char * src;
+ char * dst;
+ char * cap;
+
+ if (!bufsize) {
+ errno = ENOBUFS;
+ return -1;
+ }
+
+ src = srcpath;
+ dst = dstpath;
+ cap = &dst[bufsize];
+
+ if ((src[0] == '/') && (src[1] == '/') && (src[2] != '/')) {
+ *dst++ = *src++;
+ *dst++ = *src++;
+ }
+
+ if (flags & TPAX_DRIVER_PURE_PATH_OUTPUT)
+ if ((src[0] == '.') && (src[1] == '/'))
+ for (++src; *src=='/'; src++)
+ (void)0;
+
+ for (; *src; ) {
+ if ((src[0] == '.') && (src[1] == '.')) {
+ if ((src[2] == '/') || (src[2] == '\0')) {
+ if (flags & TPAX_DRIVER_STRICT_PATH_INPUT) {
+ errno = EINVAL;
+ return -1;
+ }
+ }
+ }
+
+ if (flags & TPAX_DRIVER_PURE_PATH_OUTPUT) {
+ if ((src[0] == '.') && (src[1] == '/') && (src[-1] == '/')) {
+ for (++src; *src=='/'; src++)
+ (void)0;
+
+ } else if ((src[0] == '/')) {
+ for (src++; *src=='/'; src++)
+ (void)0;
+
+ *dst++ = '/';
+
+ } else {
+ *dst++ = *src++;
+ }
+ } else {
+ *dst++ = *src++;
+ }
+
+ if (dst == cap) {
+ errno = ENOBUFS;
+ return -1;
+ }
+ }
+
+ if (nwritten)
+ *nwritten = dst - dstpath;
+
+ *dst = '\0';
+
+ return 0;
+}