feat: copy files

pkg/fs/CMakeLists.txt

@@ -1,5 +1,5 @@
 add_library(onusfs)
 add_library(onus::fs ALIAS onusfs)
-target_sources(onusfs PRIVATE src/tmp.c)
+target_sources(onusfs PRIVATE src/tmp.c src/cpmv.c)
 target_include_directories(onusfs PUBLIC include)
 target_link_libraries(onusfs PUBLIC onus::common)

pkg/fs/src/cpmv.c

@@ -0,0 +1,48 @@
+#define _XOPEN_SOURCE 2008
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <sys/sendfile.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include "onus/err.h"
+#include "onus/fs.h"
+
+/**
+ * Copies a file from one location to another, overwriting if necessary
+ * @param src: Path to original file
+ * @param dst: Path to destination file (including file name)
+ * @throws ONUS_E_FILE_NOT_FOUND if src does not point to an existing file, or
+ * if dst does not point to a path within an existing directory
+ * @throws ONUS_E_PERMISSION_ERROR if the user does not have permission to read
+ * src or to write to dst, ONUS_E_FS_ERR for unspecified file system errors
+ * @returns ONUS_SUCCESS on success
+ */
+int onus_fs_copy_file(const char *src, const char *dst) {
+  int fsrc = -1, fdst = -1;
+  struct stat srcstat;
+  off_t copied = 0;
+  int ret;
+
+  fsrc = open(src, O_RDONLY);
+  fdst = open(dst, O_WRONLY | O_CREAT);
+  fstat(fsrc, &srcstat);
+
+  if (!fsrc || !fdst)
+    return errno == EACCES ? ONUS_E_PERMISSION_ERROR : ONUS_E_FILE_NOT_FOUND;
+
+  while (copied < srcstat.st_size) {
+    ssize_t c = sendfile(fdst, fsrc, &copied, SSIZE_MAX);
+    copied += c;
+    if (c == -1) {
+        ret = ONUS_E_FS_ERROR;
+        goto end;
+    }
+  };
+
+  ret = ONUS_SUCCESS;
+end:
+  if (fsrc != -1) close(fsrc);
+  if (fdst != -1) close(fdst);
+  return ret;
+}

pkg/fs/src/tmp.c

@@ -1,13 +1,13 @@
 #define _XOPEN_SOURCE 2008
-#include "onus/err.h"
-#include "onus/fs.h"
-#include "onus/str.h"
 #include <errno.h>
 #include <ftw.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <limits.h>
+#include "onus/err.h"
+#include "onus/fs.h"
+#include "onus/str.h"
 
 /* TODO: Add def for windows */
 static const char *kTemporaryDirectoryPathDefault = "/tmp";