com32/lib/getcwd.c

   1 /*
   2  * getcwd.c
   3  */
   4
   5 #include <syslinux/config.h>
   6 #include <klibc/compiler.h>
   7 #include <com32.h>
   8
   9 #include <dirent.h>
  10 #include <stdio.h>
  11 #include <errno.h>
  12 #include <string.h>
  13
  14 char *getcwd(char *buf, size_t size)
  15 {
  16     static com32sys_t reg;
  17     char *pwdstr, *ret;
  18
  19     reg.eax.w[0] = 0x001f;
  20     __intcall(0x22, &reg, &reg);
  21     pwdstr = MK_PTR(reg.es, reg.ebx.w[0]);
  22     if ((strlen(pwdstr) < size) && (buf != NULL)) {
  23         strcpy(buf, pwdstr);
  24         ret = buf;
  25     } else {
  26         ret = NULL;
  27         errno = ERANGE;
  28     }
  29     return ret;
  30 }