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- /*
- * Copyright (c) 1988 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #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 5.8 (Berkeley) 11/6/91";
- #endif /* not lint */
-
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <sys/mman.h>
- #include <fcntl.h>
- #include <errno.h>
- #include <a.out.h>
- #include <unistd.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
-
- typedef struct exec EXEC;
- typedef struct nlist NLIST;
-
- #define strx n_un.n_strx
-
- void err __P((const char *fmt, ...));
- void s_stab __P((const char *, int, EXEC *));
- void s_sym __P((const char *, int, EXEC *));
- void usage __P((void));
-
- main(argc, argv)
- int argc;
- char *argv[];
- {
- register int fd, nb;
- EXEC head;
- void (*sfcn)__P((const char *, int, EXEC *));
- int ch;
- char *fn;
-
- sfcn = s_sym;
- while ((ch = getopt(argc, argv, "d")) != EOF)
- switch(ch) {
- case 'd':
- sfcn = s_stab;
- break;
- case '?':
- default:
- usage();
- }
- argc -= optind;
- argv += optind;
-
- while (fn = *argv++) {
- if ((fd = open(fn, O_RDWR)) < 0 ||
- (nb = read(fd, &head, sizeof(EXEC))) == -1) {
- err("%s: %s", fn, strerror(errno));
- continue;
- }
- if (nb != sizeof(EXEC) || N_BADMAG(head)) {
- err("%s: %s", fn, strerror(EFTYPE));
- continue;
- }
- sfcn(fn, fd, &head);
- if (close(fd))
- err("%s: %s", fn, strerror(errno));
- }
- exit(0);
- }
-
- void
- s_sym(fn, fd, ep)
- const char *fn;
- int fd;
- register EXEC *ep;
- {
- static int pagesize = -1;
- register off_t fsize;
-
- /* If no symbols or data/text relocation info, quit. */
- if (!ep->a_syms && !ep->a_trsize && !ep->a_drsize)
- return;
-
- /*
- * New file size is the header plus text and data segments; OMAGIC
- * and NMAGIC formats have the text/data immediately following the
- * header. ZMAGIC format wastes the rest of of header page.
- */
- if (ep->a_magic == ZMAGIC)
- fsize = pagesize == -1 ? (pagesize = getpagesize()) : pagesize;
- else
- fsize = sizeof(EXEC);
- fsize += ep->a_text + ep->a_data;
-
- /* Set symbol size and relocation info values to 0. */
- ep->a_syms = ep->a_trsize = ep->a_drsize = 0;
-
- /* Rewrite the header and truncate the file. */
- if (lseek(fd, 0L, SEEK_SET) == -1 ||
- write(fd, ep, sizeof(EXEC)) != sizeof(EXEC) ||
- ftruncate(fd, fsize))
- err("%s: %s", fn, strerror(errno));
- }
-
- void
- s_stab(fn, fd, ep)
- const char *fn;
- int fd;
- EXEC *ep;
- {
- register int cnt, len, nsymcnt;
- register char *nstr, *nstrbase, *p, *strbase;
- register NLIST *sym, *nsym;
- struct stat sb;
- NLIST *symbase;
-
- /* Quit if no symbols. */
- if (ep->a_syms == 0)
- return;
-
- /* Map the file. */
- if (fstat(fd, &sb) ||
- (ep = (EXEC *)mmap(NULL, sb.st_size, PROT_READ | PROT_WRITE,
- MAP_FILE | MAP_SHARED, fd, (off_t)0)) == (EXEC *)-1)
- err("%s: %s", fn, strerror(errno));
-
- /*
- * Initialize old and new symbol pointers. They both point to the
- * beginning of the symbol table in memory, since we're deleting
- * entries.
- */
- sym = nsym = symbase = (NLIST *)((char *)ep + N_SYMOFF(*ep));
-
- /*
- * Allocate space for the new string table, initialize old and
- * new string pointers. Handle the extra long at the beginning
- * of the string table.
- */
- strbase = (char *)ep + N_STROFF(*ep);
- if ((nstrbase = malloc((u_int)*(u_long *)strbase)) == NULL)
- err("%s", strerror(errno));
- nstr = nstrbase + sizeof(u_long);
-
- /*
- * Read through the symbol table. For each non-debugging symbol,
- * copy it and save its string in the new string table. Keep
- * track of the number of symbols.
- */
- for (cnt = ep->a_syms / sizeof(NLIST); cnt--; ++sym)
- if (!(sym->n_type & N_STAB) && sym->strx) {
- *nsym = *sym;
- nsym->strx = nstr - nstrbase;
- p = strbase + sym->strx;
- len = strlen(p) + 1;
- bcopy(p, nstr, len);
- nstr += len;
- ++nsym;
- }
-
- /* Fill in new symbol table size. */
- ep->a_syms = (nsym - symbase) * sizeof(NLIST);
-
- /* Fill in the new size of the string table. */
- *(u_long *)nstrbase = len = nstr - nstrbase;
-
- /*
- * Copy the new string table into place. Nsym should be pointing
- * at the address past the last symbol entry.
- */
- bcopy(nstrbase, (void *)nsym, len);
-
- /* Truncate to the current length. */
- if (ftruncate(fd, (char *)nsym + len - (char *)ep))
- err("%s: %s", fn, strerror(errno));
- munmap((caddr_t)ep, sb.st_size);
- }
-
- void
- usage()
- {
- (void)fprintf(stderr, "usage: strip [-d] file ...\n");
- exit(1);
- }
-
- #if __STDC__
- #include <stdarg.h>
- #else
- #include <varargs.h>
- #endif
-
- void
- #if __STDC__
- err(const char *fmt, ...)
- #else
- err(fmt, va_alist)
- char *fmt;
- va_dcl
- #endif
- {
- va_list ap;
- #if __STDC__
- va_start(ap, fmt);
- #else
- va_start(ap);
- #endif
- (void)fprintf(stderr, "strip: ");
- (void)vfprintf(stderr, fmt, ap);
- va_end(ap);
- (void)fprintf(stderr, "\n");
- exit(1);
- }
-