stdlib.c

   1 #include <stdlib.h>
   2 #include <string.h>
   3
   4 char **environ;
   5
   6 void exit(int status)
   7 {
   8         _exit(status);
   9 }
  10
  11 int abs(int n)
  12 {
  13         return n >= 0 ? n : -n;
  14 }
  15
  16 long labs(long n)
  17 {
  18         return n >= 0 ? n : -n;
  19 }
  20
  21 char *getenv(char *name)
  22 {
  23         char **p = environ;
  24         int len = strlen(name);
  25         for (; *p; p++)
  26                 if (!memcmp(name, *p, len) && (*p)[len] == '=')
  27                         return *p + len + 1;
  28         return NULL;
  29 }