"insmod caches the symbolname in a variable before modifying it and uses

[oweals/busybox.git] / miscutils / makedevs.c

diff --git a/miscutils/makedevs.c b/miscutils/makedevs.c
index eed3968c831af5f2ed44fd6a7f253c711da3e3bb..308d651ae92e4433a397bc4140c83b254952c5f3 100644 (file)
--- a/miscutils/makedevs.c
+++ b/miscutils/makedevs.c
@@ -7,64 +7,61 @@
  * known bugs: can't deal with alpha ranges
  */
 
-#include "busybox.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/types.h>
+#include "busybox.h"
 
 int makedevs_main(int argc, char **argv)
 {
+       mode_t mode;
+       char *basedev, *type, *nodname, buf[255];
+       int major, Sminor, S, E;
 
-       const char *basedev = argv[1];
-       const char *type = argv[2];
-       int major = atoi(argv[3]);
-       int Sminor = atoi(argv[4]);
-       int S = atoi(argv[5]);
-       int E = atoi(argv[6]);
-       int sbase = argc == 8 ? 1 : 0;
+       if (argc < 7 || *argv[1]=='-')
+               bb_show_usage();
 
-       mode_t mode = 0;
-       dev_t dev = 0;
-       char devname[255];
-       char buf[255];
+       basedev = argv[1];
+       type = argv[2];
+       major = atoi(argv[3]) << 8;  /* correcting param to mknod() */
+       Sminor = atoi(argv[4]);
+       S = atoi(argv[5]);
+       E = atoi(argv[6]);
+       nodname = argc == 8 ? basedev : buf;
 
-       if (argc < 7 || *argv[1]=='-')
-               show_usage();
+       mode = 0660;
 
        switch (type[0]) {
        case 'c':
-               mode = S_IFCHR;
+               mode |= S_IFCHR;
                break;
        case 'b':
-               mode = S_IFBLK;
+               mode |= S_IFBLK;
                break;
        case 'f':
-               mode = S_IFIFO;
+               mode |= S_IFIFO;
                break;
        default:
-               show_usage();
+               bb_show_usage();
        }
-       mode |= 0660;
 
        while (S <= E) {
+               int sz;
 
-               if (type[0] != 'f')
-                       dev = (major << 8) | Sminor;
-               strcpy(devname, basedev);
+               sz = snprintf(buf, sizeof(buf), "%s%d", basedev, S);
+               if(sz<0 || sz>=sizeof(buf))  /* libc different */
+                       bb_error_msg_and_die("%s too large", basedev);
 
-               if (sbase == 0) {
-                       sprintf(buf, "%d", S);
-                       strcat(devname, buf);
-               } else {
-                       sbase = 0;
-               }
+       /* if mode != S_IFCHR and != S_IFBLK third param in mknod() ignored */
 
-               if (mknod(devname, mode, dev))
-                       printf("Failed to create: %s\n", devname);
+               if (mknod(nodname, mode, major | Sminor))
+                       bb_error_msg("Failed to create: %s", nodname);
 
+               if (nodname == basedev) /* ex. /dev/hda - to /dev/hda1 ... */
+                       nodname = buf;
                S++;
                Sminor++;
        }