From d38c13b2fe1293b499312bb4cfd66a56108c4b5e Mon Sep 17 00:00:00 2001
From: bigfoot547 <bigfoot@figboot.dev>
Date: Mon, 8 Jan 2024 12:17:20 -0600
Subject: WIP: JRE stuff

---
 src/launcherutil.c | 168 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)

(limited to 'src/launcherutil.c')

diff --git a/src/launcherutil.c b/src/launcherutil.c
index e1e8c40..b292df9 100644
--- a/src/launcherutil.c
+++ b/src/launcherutil.c
@@ -13,6 +13,8 @@
 #include <sys/stat.h>
 #include <stdarg.h>
 #include <alloca.h>
+#include <ftw.h>
+#include <dirent.h>
 
 /* handcoded string functions
  *
@@ -138,6 +140,44 @@ int l2_launcher_open_config(const char *path, int flags, mode_t mode)
   return instfd;
 }
 
+int l2_launcher__rmtree_ftw_delete_with_reckless_abandon(const char *fpath, const struct stat *st, int typeflag, struct FTW *ftwbuf)
+{
+  L2_UNUSED(ftwbuf);
+  L2_UNUSED(st);
+
+  switch (typeflag) {
+    case FTW_F:
+    case FTW_SL:
+      if (unlink(fpath) < 0) {
+        CMD_WARN("l2_rm_tree: Failed to delete file or symlink %s: %s", fpath, strerror(errno));
+        return 1;
+      }
+      break;
+    case FTW_DP:
+      if (rmdir(fpath) < 0) {
+        CMD_WARN("l2_rm_tree: Failed to delete directory %s: %s", fpath, strerror(errno));
+        return 1;
+      }
+      break;
+    case FTW_DNR:
+      CMD_WARN("l2_rm_tree: Not traversing into directory I cannot read: %s", fpath);
+      break;
+    case FTW_NS:
+      CMD_WARN("l2_rm_tree: Not deleting/traversing file I cannot stat: %s", fpath);
+      break;
+  }
+  return 0;
+}
+
+int l2_launcher_rm_tree(const char *path, int nfds)
+{
+  if (nfds <= 0) nfds = 64;
+
+  int res = nftw(path, &l2_launcher__rmtree_ftw_delete_with_reckless_abandon, nfds, FTW_DEPTH | FTW_PHYS);
+  if (res != 0) return -1;
+  return 0;
+}
+
 int l2_launcher_mkdir_parents(const char *path)
 {
   return l2_launcher_mkdir_parents_ex(path, 0);
@@ -465,3 +505,131 @@ cleanup:
   if (pc) curl_easy_cleanup(pc);
   return res;
 }
+
+struct l2_ftw__data_int {
+  struct l2_ftw_data user;
+
+  size_t pathcap;
+  size_t pathlen;
+  int abort;
+};
+
+int l2_launcher__ftw_update_path(char **path, struct l2_ftw__data_int *ftw, const char *entname)
+{
+  size_t entlen = strlen(entname);
+  if (ftw->pathlen + entlen + 2 > ftw->pathcap) {
+    char *newpathbuf = realloc(*path, ftw->pathlen + entlen + 2);
+    if (!newpathbuf) return -1;
+    *path = newpathbuf;
+    ftw->pathcap = ftw->pathlen + entlen + 2;
+  }
+
+  (*path)[ftw->pathlen] = '/';
+  ++ftw->pathlen;
+  memcpy(*path + ftw->pathlen, entname, entlen + 1);
+  ftw->pathlen += entlen;
+  return 0;
+}
+
+int l2_launcher__ftw_internal(char **path, int depth, l2_ftw_proc_t *proc, struct l2_ftw__data_int *ftw)
+{
+  if (depth <= 0) {
+    CMD_DEBUG0("myftw: interation depth exceeded");
+    return -1;
+  }
+
+  DIR *thisdir = opendir(*path);
+  int res;
+  if (!thisdir) {
+    if (errno != ENOENT || ftw->user.depth == 0) {
+      CMD_DEBUG("myftw: could not open %s: %s", *path, strerror(errno));
+      return -1;
+    }
+    CMD_DEBUG("myftw: directory %s does not exist. (maybe it was deleted?)", *path);
+    return 0;
+  }
+
+  ++ftw->user.depth;
+
+  struct dirent *ent;
+  struct stat st;
+  size_t pathlen = ftw->pathlen;
+
+  errno = 0;
+  while ((ent = readdir(thisdir))) {
+    if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, "..")) continue;
+
+    int flags = 0;
+    if (fstatat(dirfd(thisdir), ent->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
+      CMD_DEBUG("myftw: stat failed %s: %s", *path, strerror(errno));
+      res = -1;
+      goto cleanup;
+    }
+
+    ftw->pathlen = pathlen;
+    (*path)[pathlen] = '\0';
+    l2_launcher__ftw_update_path(path, ftw, ent->d_name);
+
+    if (S_ISREG(st.st_mode)) {
+      flags |= L2_FTW_FILE;
+    }
+
+    if (S_ISDIR(st.st_mode)) {
+      flags |= L2_FTW_DIR;
+    }
+
+    if (S_ISLNK(st.st_mode)) {
+      flags |= L2_FTW_SYMLINK;
+    }
+
+    if ((res = (*proc)(*path, &st, flags, (struct l2_ftw_data *)ftw))) {
+      CMD_DEBUG("myftw: user aborted %s: %d", *path, res);
+      ftw->abort = 1;
+      goto cleanup;
+    }
+
+    if (S_ISDIR(st.st_mode)) {
+      if ((res = l2_launcher__ftw_internal(path, depth - 1, proc, ftw)) < 0 || ftw->abort) {
+        goto cleanup;
+      }
+    }
+
+    errno = 0;
+  }
+
+  if (errno) {
+    CMD_DEBUG("myftw: readdir failed on %s: %s", *path, strerror(errno));
+    res = -1;
+    goto cleanup;
+  }
+
+  --ftw->user.depth;
+  res = 0;
+
+cleanup:
+  closedir(thisdir);
+  return res;
+}
+
+int l2_launcher_ftw(const char *path, int depth, l2_ftw_proc_t *proc, void *user)
+{
+  struct l2_ftw__data_int data;
+  size_t pathlen = strlen(path);
+
+  data.user.depth = 0;
+  data.user.reloffset = pathlen + 1;
+  data.user.user = user;
+  data.abort = 0;
+
+  char *pathdup = strdup(path);
+  data.pathcap = pathlen + 1;
+  data.pathlen = pathlen;
+
+  if (!pathdup) return -1;
+
+  int res = l2_launcher__ftw_internal(&pathdup, depth, proc, &data);
+
+  free(pathdup);
+  
+  return res;
+}
-- 
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