Refactor to add hiercopy_loose (for s6-l-i)

Signed-off-by: Laurent Bercot <ska@appnovation.com>

1 files changed, 88 insertions, 0 deletions

diff --git a/src/libstddjb/hiercopy_internal.c b/src/libstddjb/hiercopy_internal.c
new file mode 100644
index 0000000..c512463
--- /dev/null
+++ b/src/libstddjb/hiercopy_internal.c
@@ -0,0 +1,88 @@
+/* ISC license. */
+
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <skalibs/stralloc.h>
+#include <skalibs/direntry.h>
+#include <skalibs/djbunix.h>
+
+static int dircopy (char const *src, char const *dst, mode_t mode, stralloc *tmp, unsigned int options)
+{
+  size_t tmpbase = tmp->len ;
+  size_t maxlen = 0 ;
+  if (sals(src, tmp, &maxlen) == -1) return 0 ;
+
+  if (mkdir(dst, S_IRWXU) < 0)
+  {
+    struct stat st ;
+    if (errno != EEXIST) goto err ;
+    if (stat(dst, &st) < 0) goto err ;
+    if (!S_ISDIR(st.st_mode)) { errno = ENOTDIR ; goto err ; }
+  }
+  {
+    size_t srclen = strlen(src) ;
+    size_t dstlen = strlen(dst) ;
+    size_t i = tmpbase ;
+    char srcbuf[srclen + maxlen + 2] ;
+    char dstbuf[dstlen + maxlen + 2] ;
+    memcpy(srcbuf, src, srclen) ;
+    memcpy(dstbuf, dst, dstlen) ;
+    srcbuf[srclen] = '/' ;
+    dstbuf[dstlen] = '/' ;
+    while (i < tmp->len)
+    {
+      size_t n = strlen(tmp->s + i) + 1 ;
+      memcpy(srcbuf + srclen + 1, tmp->s + i, n) ;
+      memcpy(dstbuf + dstlen + 1, tmp->s + i, n) ;
+      i += n ;
+      hiercopy_internal(srcbuf, dstbuf, tmp, 0) ;
+    }
+  }
+  if (chmod(dst, mode) < 0 && !(options & 1)) goto err ;
+  tmp->len = tmpbase ;
+  return 1 ;
+err:
+  tmp->len = tmpbase ;
+  return 0 ;
+}
+
+int hiercopy_internal (char const *src, char const *dst, stralloc *tmp, unsigned int options)
+{
+  struct stat st ;
+  if (lstat(src, &st) < 0) return 0 ;
+  if (S_ISREG(st.st_mode))
+  {
+    if (!filecopy_unsafe(src, dst, st.st_mode)) return 0 ;
+  }
+  else if (S_ISDIR(st.st_mode))
+  {
+    if (!dircopy(src, dst, st.st_mode, tmp, options)) return 0 ;
+  }
+  else if (S_ISFIFO(st.st_mode))
+  {
+    if (mkfifo(dst, st.st_mode) < 0) return 0 ;
+  }
+  else if (S_ISLNK(st.st_mode))
+  {
+    size_t tmpbase = tmp->len ;
+    if (sareadlink(tmp, src) < 0) return 0 ;
+    if (!stralloc_0(tmp) || symlink(tmp->s + tmpbase, dst) < 0)
+    {
+      tmp->len = tmpbase ;
+      return 0 ;
+    }
+    tmp->len = tmpbase ;
+  }
+  else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode) || S_ISSOCK(st.st_mode))
+  {
+    if (mknod(dst, st.st_mode, st.st_rdev) < 0) return 0 ;
+  }
+  else return (errno = ENOTSUP, 0) ;
+  lchown(dst, st.st_uid, st.st_gid) ;
+  if (!S_ISLNK(st.st_mode)) chmod(dst, st.st_mode) ;
+  return 1 ;
+}