Fix all -Wmissing-prototypes warnings in x86 defconfig
[linux-2.6.git] / usr / gen_init_cpio.c
index 7abc07f..83b3dde 100644 (file)
@@ -370,6 +370,30 @@ error:
        return rc;
 }
 
+static char *cpio_replace_env(char *new_location)
+{
+       char expanded[PATH_MAX + 1];
+       char env_var[PATH_MAX + 1];
+       char *start;
+       char *end;
+
+       for (start = NULL; (start = strstr(new_location, "${")); ) {
+               end = strchr(start, '}');
+               if (start < end) {
+                       *env_var = *expanded = '\0';
+                       strncat(env_var, start + 2, end - start - 2);
+                       strncat(expanded, new_location, start - new_location);
+                       strncat(expanded, getenv(env_var), PATH_MAX);
+                       strncat(expanded, end + 1, PATH_MAX);
+                       strncpy(new_location, expanded, PATH_MAX);
+               } else
+                       break;
+       }
+
+       return new_location;
+}
+
+
 static int cpio_mkfile_line(const char *line)
 {
        char name[PATH_MAX + 1];
@@ -415,13 +439,14 @@ static int cpio_mkfile_line(const char *line)
        } else {
                dname = name;
        }
-       rc = cpio_mkfile(dname, location, mode, uid, gid, nlinks);
+       rc = cpio_mkfile(dname, cpio_replace_env(location),
+                        mode, uid, gid, nlinks);
  fail:
        if (dname_len) free(dname);
        return rc;
 }
 
-void usage(const char *prog)
+static void usage(const char *prog)
 {
        fprintf(stderr, "Usage:\n"
                "\t%s <cpio_list>\n"
@@ -439,6 +464,7 @@ void usage(const char *prog)
                "\n"
                "<name>       name of the file/dir/nod/etc in the archive\n"
                "<location>   location of the file in the current filesystem\n"
+               "             expands shell variables quoted with ${}\n"
                "<target>     link target\n"
                "<mode>       mode/permissions of the file\n"
                "<uid>        user id (0=root)\n"