commands/acksize/acksize.c

   1 /* size - tell size of an object file           Author: Andy Tanenbaum */
   2
   3 #include <sys/types.h>
   4 #include <fcntl.h>
   5 #include <a.out.h>
   6 #include <stdlib.h>
   7 #include <unistd.h>
   8 #include <stdio.h>
   9
  10 int heading;                    /* set when heading printed */
  11 int error;
  12
  13 int main(int argc, char **argv);
  14 void size(char *name);
  15
  16 int main(argc, argv)
  17 int argc;
  18 char *argv[];
  19 {
  20   int i;
  21
  22   if (argc == 1) {
  23         size("a.out");
  24         exit(error);
  25   }
  26   for (i = 1; i < argc; i++) size(argv[i]);
  27   return(error);
  28 }
  29
  30
  31
  32 void size(name)
  33 char *name;
  34 {
  35   int fd, separate;
  36   long dynam, allmem;
  37   struct exec exec;
  38
  39   if ((fd = open(name, O_RDONLY)) < 0) {
  40         fprintf(stderr, "size: can't open %s\n", name);
  41         error = 1;
  42         return;
  43   }
  44   if (read(fd, (char *)&exec, sizeof(struct exec)) != sizeof(struct exec)) {
  45         fprintf(stderr, "size: %s: header too short\n", name);
  46         error = 1;
  47         close(fd);
  48         return;
  49   }
  50   if (BADMAG(exec)) {
  51         fprintf(stderr, "size: %s not an object file\n", name);
  52         error = 1;
  53         close(fd);
  54         return;
  55   }
  56   separate = (exec.a_flags & A_SEP ? 1 : 0);
  57   dynam = exec.a_total - exec.a_text - exec.a_data - exec.a_bss;
  58   if (separate) dynam += exec.a_text;
  59   allmem = (separate ? exec.a_total + exec.a_text : exec.a_total);
  60   if (heading++ == 0) printf("   text    data     bss    stack   memory\n");
  61   printf("%7ld %7ld %7ld %8ld %8ld  %s\n",
  62          exec.a_text, exec.a_data, exec.a_bss, dynam, allmem, name);
  63   close(fd);
  64 }