260 lines
6.5 KiB
C
260 lines
6.5 KiB
C
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1988, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)strip.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <a.out.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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typedef struct exec EXEC;
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typedef struct nlist NLIST;
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#define strx n_un.n_strx
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void err __P((int, const char *fmt, ...));
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void s_stab __P((const char *, int, EXEC *));
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void s_sym __P((const char *, int, EXEC *));
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void usage __P((void));
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int eval;
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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register int fd, nb;
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EXEC head;
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void (*sfcn)__P((const char *, int, EXEC *));
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int ch;
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char *fn;
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sfcn = s_sym;
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while ((ch = getopt(argc, argv, "d")) != EOF)
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switch(ch) {
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case 'd':
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sfcn = s_stab;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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while (fn = *argv++) {
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if ((fd = open(fn, O_RDWR)) < 0 ||
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(nb = read(fd, &head, sizeof(EXEC))) == -1) {
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err(0, "%s: %s", fn, strerror(errno));
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continue;
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}
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if (nb != sizeof(EXEC) || N_BADMAG(head)) {
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err(0, "%s: %s", fn, strerror(EFTYPE));
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continue;
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}
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sfcn(fn, fd, &head);
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if (close(fd))
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err(0, "%s: %s", fn, strerror(errno));
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}
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exit(eval);
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}
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void
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s_sym(fn, fd, ep)
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const char *fn;
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int fd;
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register EXEC *ep;
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{
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register off_t fsize;
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/* If no symbols or data/text relocation info, quit. */
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if (!ep->a_syms && !ep->a_trsize && !ep->a_drsize)
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return;
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/*
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* New file size is the header plus text and data segments.
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*/
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fsize = N_DATOFF(*ep) + ep->a_data;
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/* Set symbol size and relocation info values to 0. */
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ep->a_syms = ep->a_trsize = ep->a_drsize = 0;
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/* Rewrite the header and truncate the file. */
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if (lseek(fd, (off_t)0, SEEK_SET) == -1 ||
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write(fd, ep, sizeof(EXEC)) != sizeof(EXEC) ||
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ftruncate(fd, fsize))
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err(0, "%s: %s", fn, strerror(errno));
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}
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void
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s_stab(fn, fd, ep)
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const char *fn;
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int fd;
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EXEC *ep;
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{
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register int cnt, len;
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register char *nstr, *nstrbase, *p, *strbase;
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register NLIST *sym, *nsym;
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struct stat sb;
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NLIST *symbase;
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/* Quit if no symbols. */
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if (ep->a_syms == 0)
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return;
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/* Stat the file. */
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if (fstat(fd, &sb) < 0) {
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err(0, "%s: %s", fn, strerror(errno));
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return;
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}
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/* Check size. */
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if (sb.st_size > SIZE_T_MAX) {
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err(0, "%s: %s", fn, strerror(EFBIG));
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return;
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}
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/* Map the file. */
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if ((ep = (EXEC *)mmap(NULL, (size_t)sb.st_size,
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PROT_READ | PROT_WRITE, MAP_SHARED, fd, (off_t)0)) == (EXEC *)-1) {
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err(0, "%s: %s", fn, strerror(errno));
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return;
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}
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/*
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* Initialize old and new symbol pointers. They both point to the
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* beginning of the symbol table in memory, since we're deleting
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* entries.
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*/
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sym = nsym = symbase = (NLIST *)((char *)ep + N_SYMOFF(*ep));
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/*
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* Allocate space for the new string table, initialize old and
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* new string pointers. Handle the extra long at the beginning
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* of the string table.
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*/
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strbase = (char *)ep + N_STROFF(*ep);
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if ((nstrbase = malloc((u_int)*(u_long *)strbase)) == NULL)
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err(1, "%s", strerror(errno));
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nstr = nstrbase + sizeof(u_long);
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/*
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* Read through the symbol table. For each non-debugging symbol,
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* copy it and save its string in the new string table. Keep
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* track of the number of symbols.
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*/
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for (cnt = ep->a_syms / sizeof(NLIST); cnt--; ++sym)
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if (!(sym->n_type & N_STAB) && sym->strx) {
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*nsym = *sym;
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nsym->strx = nstr - nstrbase;
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p = strbase + sym->strx;
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len = strlen(p) + 1;
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bcopy(p, nstr, len);
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nstr += len;
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++nsym;
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}
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/* Fill in new symbol table size. */
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ep->a_syms = (nsym - symbase) * sizeof(NLIST);
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/* Fill in the new size of the string table. */
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*(u_long *)nstrbase = len = nstr - nstrbase;
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/*
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* Copy the new string table into place. Nsym should be pointing
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* at the address past the last symbol entry.
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*/
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bcopy(nstrbase, (void *)nsym, len);
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/* Truncate to the current length. */
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if (ftruncate(fd, (char *)nsym + len - (char *)ep))
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err(0, "%s: %s", fn, strerror(errno));
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munmap((caddr_t)ep, (size_t)sb.st_size);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: strip [-d] file ...\n");
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exit(1);
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}
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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void
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#if __STDC__
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err(int fatal, const char *fmt, ...)
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#else
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err(fatal, fmt, va_alist)
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int fatal;
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char *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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(void)fprintf(stderr, "strip: ");
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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(void)fprintf(stderr, "\n");
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if (fatal)
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exit(1);
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eval = 1;
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}
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