cleanups, add manual page

[unix-history] / usr / src / usr.bin / strip / strip.c

/*
* Copyright (c) 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1988 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)strip.c     5.3 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <sys/file.h>
#include <a.out.h>
#include <stdio.h>

/* ARGSUSED */
main(argc, argv)
       int argc;
       char **argv;
{
       typedef struct exec EXEC;
       register off_t fsize;
       register int fd, n, pagesize;
       EXEC head;
       off_t lseek();

       pagesize = getpagesize();
       while (*++argv) {
               if ((fd = open(*argv, O_RDWR)) < 0 ||
                   (n = read(fd, (char *)&head, sizeof(EXEC))) == -1)
                       error(*argv);
               if (n != sizeof(EXEC) || N_BADMAG(head)) {
                       fprintf(stderr, "strip: %s not in a.out format.\n",
                           *argv);
                       exit(1);
               }
               if (!head.a_syms && !head.a_trsize && !head.a_drsize) {
                       fprintf(stderr, "strip: %s already stripped.\n", *argv);
                       continue;
               }
               fsize = head.a_text + head.a_data;
               if (head.a_magic == ZMAGIC)
                       fsize += pagesize - sizeof(EXEC);
               head.a_syms = head.a_trsize = head.a_drsize = 0;
               if (ftruncate(fd, fsize + sizeof(EXEC)) ||
                   lseek(fd, 0L, L_SET) == -1 ||
                   write(fd, (char *)&head, sizeof(EXEC)) != sizeof(EXEC))
                       error(*argv);
               (void)close(fd);
       }
       exit(0);
}

static
error(fname)
       char *fname;
{
       fprintf(stderr, "strip: %s: ", fname);
       perror((char *)NULL);
       exit(1);
}