core/fs/lib/loadconfig.c

   1 #include <dprintf.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <core.h>
   5 #include <fs.h>
   6
   7 /*
   8  * Standard version of load_config for extlinux/syslinux filesystems.
   9  *
  10  * This searches for extlinux.conf and syslinux.cfg in the install
  11  * directory, followed by a set of fallback directories.  If found,
  12  * set the current working directory to match.
  13  */
  14 int generic_load_config(void)
  15 {
  16     static const char *search_directories[] = {
  17         NULL,                   /* CurrentDirName */
  18         "/boot/syslinux",
  19         "/syslinux",
  20         "/",
  21         NULL
  22     };
  23     static const char *filenames[] = {
  24         "extlinux.conf",
  25         "syslinux.cfg",
  26         NULL
  27     };
  28     com32sys_t regs;
  29     int i, j;
  30
  31     search_directories[0] = CurrentDirName;
  32
  33     dprintf("CurrentDirName: \"%s\"\n", CurrentDirName);
  34
  35     for (i = *CurrentDirName ? 0 : 1; search_directories[i]; i++) {
  36         const char *sd = search_directories[i];
  37         for (j = 0; filenames[j]; j++) {
  38             memset(&regs, 0, sizeof regs);
  39             snprintf(ConfigName, FILENAME_MAX, "%s%s%s",
  40                      sd, (*sd && sd[strlen(sd)-1] == '/') ? "" : "/",
  41                      filenames[j]);
  42             regs.edi.w[0] = OFFS_WRT(ConfigName, 0);
  43             dprintf("Config search: %s\n", ConfigName);
  44             call16(core_open, &regs, &regs);
  45             if (!(regs.eflags.l & EFLAGS_ZF)) {
  46                 chdir(search_directories[i]);
  47                 return 0;       /* Got it */
  48             }
  49         }
  50     }
  51
  52     return -1;
  53 }