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Unified Diff: fusl/src/misc/nftw.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: fusl/src/misc/nftw.c
diff --git a/fusl/src/misc/nftw.c b/fusl/src/misc/nftw.c
new file mode 100644
index 0000000000000000000000000000000000000000..efb2b89524747397b0ccf3e5bbfb5438fd9ecd87
--- /dev/null
+++ b/fusl/src/misc/nftw.c
@@ -0,0 +1,123 @@
+#include <ftw.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <limits.h>
+#include <pthread.h>
+#include "libc.h"
+
+struct history
+{
+ struct history *chain;
+ dev_t dev;
+ ino_t ino;
+ int level;
+ int base;
+};
+
+#undef dirfd
+#define dirfd(d) (*(int *)d)
+
+static int do_nftw(char *path, int (*fn)(const char *, const struct stat *, int, struct FTW *), int fd_limit, int flags, struct history *h)
+{
+ size_t l = strlen(path), j = l && path[l-1]=='/' ? l-1 : l;
+ struct stat st;
+ struct history new;
+ int type;
+ int r;
+ struct FTW lev;
+ char *name;
+
+ if ((flags & FTW_PHYS) ? lstat(path, &st) : stat(path, &st) < 0) {
+ if (!(flags & FTW_PHYS) && errno==ENOENT && !lstat(path, &st))
+ type = FTW_SLN;
+ else if (errno != EACCES) return -1;
+ else type = FTW_NS;
+ } else if (S_ISDIR(st.st_mode)) {
+ if (access(path, R_OK) < 0) type = FTW_DNR;
+ else if (flags & FTW_DEPTH) type = FTW_DP;
+ else type = FTW_D;
+ } else if (S_ISLNK(st.st_mode)) {
+ if (flags & FTW_PHYS) type = FTW_SL;
+ else type = FTW_SLN;
+ } else {
+ type = FTW_F;
+ }
+
+ if ((flags & FTW_MOUNT) && h && st.st_dev != h->dev)
+ return 0;
+
+ new.chain = h;
+ new.dev = st.st_dev;
+ new.ino = st.st_ino;
+ new.level = h ? h->level+1 : 0;
+ new.base = l+1;
+
+ lev.level = new.level;
+ lev.base = h ? h->base : (name=strrchr(path, '/')) ? name-path : 0;
+
+ if (!(flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
+ return r;
+
+ for (; h; h = h->chain)
+ if (h->dev == st.st_dev && h->ino == st.st_ino)
+ return 0;
+
+ if ((type == FTW_D || type == FTW_DP) && fd_limit) {
+ DIR *d = opendir(path);
+ if (d) {
+ struct dirent *de;
+ while ((de = readdir(d))) {
+ if (de->d_name[0] == '.'
+ && (!de->d_name[1]
+ || (de->d_name[1]=='.'
+ && !de->d_name[2]))) continue;
+ if (strlen(de->d_name) >= PATH_MAX-l) {
+ errno = ENAMETOOLONG;
+ closedir(d);
+ return -1;
+ }
+ path[j]='/';
+ strcpy(path+j+1, de->d_name);
+ if ((r=do_nftw(path, fn, fd_limit-1, flags, &new))) {
+ closedir(d);
+ return r;
+ }
+ }
+ closedir(d);
+ } else if (errno != EACCES) {
+ return -1;
+ }
+ }
+
+ path[l] = 0;
+ if ((flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
+ return r;
+
+ return 0;
+}
+
+int nftw(const char *path, int (*fn)(const char *, const struct stat *, int, struct FTW *), int fd_limit, int flags)
+{
+ int r, cs;
+ size_t l;
+ char pathbuf[PATH_MAX+1];
+
+ if (fd_limit <= 0) return 0;
+
+ l = strlen(path);
+ if (l > PATH_MAX) {
+ errno = ENAMETOOLONG;
+ return -1;
+ }
+ memcpy(pathbuf, path, l+1);
+
+ pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
+ r = do_nftw(pathbuf, fn, fd_limit, flags, NULL);
+ pthread_setcancelstate(cs, 0);
+ return r;
+}
+
+LFS64(nftw);
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