sandbox: Add a way of obtaining directory listings

This implementation uses opendir()/readdir() to access the directory
information and then puts it in a linked list for the caller's use.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@ti.com>

diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c
index 3e37c930b06d6c690a9c7054562982dd313d8ac3..d07540776cc6a8d32fb58a18e752c738c761a06d 100644 (file)
--- a/arch/sandbox/cpu/os.c
+++ b/arch/sandbox/cpu/os.c
@@ -19,10 +19,13 @@
  * MA 02111-1307 USA
  */
 
+#include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <getopt.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <termios.h>
 #include <time.h>
 #include <unistd.h>
@@ -261,3 +264,101 @@ int os_parse_args(struct sandbox_state *state, int argc, char *argv[])
 
        return 0;
 }
+
+void os_dirent_free(struct os_dirent_node *node)
+{
+       struct os_dirent_node *next;
+
+       while (node) {
+               next = node->next;
+               free(node);
+               node = next;
+       }
+}
+
+int os_dirent_ls(const char *dirname, struct os_dirent_node **headp)
+{
+       struct dirent entry, *result;
+       struct os_dirent_node *head, *node, *next;
+       struct stat buf;
+       DIR *dir;
+       int ret;
+       char *fname;
+       int len;
+
+       *headp = NULL;
+       dir = opendir(dirname);
+       if (!dir)
+               return -1;
+
+       /* Create a buffer for the maximum filename length */
+       len = sizeof(entry.d_name) + strlen(dirname) + 2;
+       fname = malloc(len);
+       if (!fname) {
+               ret = -ENOMEM;
+               goto done;
+       }
+
+       for (node = head = NULL;; node = next) {
+               ret = readdir_r(dir, &entry, &result);
+               if (ret || !result)
+                       break;
+               next = malloc(sizeof(*node) + strlen(entry.d_name) + 1);
+               if (!next) {
+                       os_dirent_free(head);
+                       ret = -ENOMEM;
+                       goto done;
+               }
+               strcpy(next->name, entry.d_name);
+               switch (entry.d_type) {
+               case DT_REG:
+                       next->type = OS_FILET_REG;
+                       break;
+               case DT_DIR:
+                       next->type = OS_FILET_DIR;
+                       break;
+               case DT_LNK:
+                       next->type = OS_FILET_LNK;
+                       break;
+               }
+               next->size = 0;
+               snprintf(fname, len, "%s/%s", dirname, next->name);
+               if (!stat(fname, &buf))
+                       next->size = buf.st_size;
+               if (node)
+                       node->next = next;
+               if (!head)
+                       head = node;
+       }
+       *headp = head;
+
+done:
+       closedir(dir);
+       return ret;
+}
+
+const char *os_dirent_typename[OS_FILET_COUNT] = {
+       "   ",
+       "SYM",
+       "DIR",
+       "???",
+};
+
+const char *os_dirent_get_typename(enum os_dirent_t type)
+{
+       if (type >= 0 && type < OS_FILET_COUNT)
+               return os_dirent_typename[type];
+
+       return os_dirent_typename[OS_FILET_UNKNOWN];
+}
+
+ssize_t os_get_filesize(const char *fname)
+{
+       struct stat buf;
+       int ret;
+
+       ret = stat(fname, &buf);
+       if (ret)
+               return ret;
+       return buf.st_size;
+}

diff --git a/include/os.h b/include/os.h
index c452d1b56ef8a87cc3d73e966be86f64dc76f083..038aba9e4fe02c8e5764d48e866507d2832f325e 100644 (file)
--- a/include/os.h
+++ b/include/os.h
@@ -146,4 +146,52 @@ u64 os_get_nsec(void);
  */
 int os_parse_args(struct sandbox_state *state, int argc, char *argv[]);
 
+/*
+ * Types of directory entry that we support. See also os_dirent_typename in
+ * the C file.
+ */
+enum os_dirent_t {
+       OS_FILET_REG,           /* Regular file */
+       OS_FILET_LNK,           /* Symbolic link */
+       OS_FILET_DIR,           /* Directory */
+       OS_FILET_UNKNOWN,       /* Something else */
+
+       OS_FILET_COUNT,
+};
+
+/** A directory entry node, containing information about a single dirent */
+struct os_dirent_node {
+       struct os_dirent_node *next;    /* Pointer to next node, or NULL */
+       ulong size;                     /* Size of file in bytes */
+       enum os_dirent_t type;          /* Type of entry */
+       char name[0];                   /* Name of entry */
+};
+
+/**
+ * Get a directionry listing
+ *
+ * This allocates and returns a linked list containing the directory listing.
+ *
+ * @param dirname      Directory to examine
+ * @param headp                Returns pointer to head of linked list, or NULL if none
+ * @return 0 if ok, -ve on error
+ */
+int os_dirent_ls(const char *dirname, struct os_dirent_node **headp);
+
+/**
+ * Get the name of a directory entry type
+ *
+ * @param type         Type to cehck
+ * @return string containing the name of that type, or "???" if none/invalid
+ */
+const char *os_dirent_get_typename(enum os_dirent_t type);
+
+/**
+ * Get the size of a file
+ *
+ * @param fname                Filename to check
+ * @return size of file, or -1 if an error ocurred
+ */
+ssize_t os_get_filesize(const char *fname);
+
 #endif