api: add function file_copy (issue #1667)

src/core/wee-dir.c

@@ -555,6 +555,62 @@ error:
     return NULL;
 }
 
+/*
+ * Copies a file to another location.
+ *
+ * Returns:
+ *   1: OK
+ *   0: error
+ */
+
+int
+dir_file_copy (const char *from, const char *to)
+{
+    FILE *src, *dst;
+    char *buffer;
+    int rc;
+    size_t count;
+
+    rc = 0;
+    buffer = NULL;
+    src = NULL;
+    dst = NULL;
+
+    if (!from || !from[0] || !to || !to[0])
+        goto end;
+
+    buffer = malloc (65536);
+    if (!buffer)
+        goto end;
+
+    src = fopen (from, "rb");
+    if (!src)
+        goto end;
+    dst = fopen (to, "wb");
+    if (!dst)
+        goto end;
+
+    while (!feof (src))
+    {
+        count = fread (buffer, 1, 65535, src);
+        if (count <= 0)
+            goto end;
+        if (fwrite (buffer, 1, count, dst) <= 0)
+            goto end;
+    }
+
+    rc = 1;
+
+end:
+    if (buffer)
+	free (buffer);
+    if (src)
+        fclose (src);
+    if (dst)
+        fclose (dst);
+    return rc;
+}
+
 /*
  * Uses one or four different paths for WeeChat home directories.
  *

src/core/wee-dir.h

@@ -33,6 +33,7 @@ extern void dir_exec_on_files (const char *directory, int recurse_subdirs,
 extern char *dir_search_full_lib_name (const char *filename,
                                        const char *sys_directory);
 extern char *dir_file_get_content (const char *filename);
+extern int dir_file_copy (const char *from, const char *to);
 extern void dir_create_home_dirs ();
 extern void dir_remove_home_dirs ();
 extern char *dir_get_string_home_dirs ();