lib/libminc/atoi.c

   1 /* Extracted from sys/arch/i386/stand/lib/bootmenu.c */
   2 int atoi(const char *);
   3
   4 #define isnum(c) ((c) >= '0' && (c) <= '9')
   5
   6 int
   7 atoi(const char *in)
   8 {
   9         const char *c;
  10         int ret;
  11
  12         ret = 0;
  13         c = in;
  14         if (*c == '-')
  15                 c++;
  16         for (; isnum(*c); c++)
  17                 ret = (ret * 10) + (*c - '0');
  18
  19         return (*in == '-') ? -ret : ret;
  20 }
  21