freebsd-src/usr.bin/strip/strip.c
2002-03-22 01:42:45 +00:00

267 lines
6.6 KiB
C

/*
* Copyright (c) 1988, 1993
* The 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
static const char copyright[] =
"@(#) Copyright (c) 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)strip.c 8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <a.out.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
typedef struct exec EXEC;
typedef struct nlist NLIST;
#define strx n_un.n_strx
void s_stab(const char *, int, EXEC *);
void s_sym(const char *, int, EXEC *);
static void usage(void);
int xflag = 0;
int err_val = 0;
int
main(argc, argv)
int argc;
char *argv[];
{
register int fd, nb;
EXEC head;
void (*sfcn)(const char *, int, EXEC *);
int ch;
char *fn;
sfcn = s_sym;
while ((ch = getopt(argc, argv, "dx")) != -1)
switch(ch) {
case 'x':
xflag = 1;
/*FALLTHROUGH*/
case 'd':
sfcn = s_stab;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
while ((fn = *argv++) != NULL) {
if ((fd = open(fn, O_RDWR)) < 0 ||
(nb = read(fd, &head, sizeof(EXEC))) == -1) {
warn("%s", fn);
err_val = 1;
if (fd >= 0 && close(fd)) {
warn("%s", fn);
err_val = 1;
}
continue;
}
if (nb != sizeof(EXEC) || N_BADMAG(head)) {
warnx("%s: %s", fn, strerror(EFTYPE));
err_val = 1;
if (close(fd)) {
warn("%s", fn);
err_val = 1;
}
continue;
}
sfcn(fn, fd, &head);
if (close(fd)) {
warn("%s", fn);
err_val = 1;
}
}
exit(err_val);
}
void
s_sym(fn, fd, ep)
const char *fn;
int fd;
register EXEC *ep;
{
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.
*/
fsize = N_DATOFF(*ep) + 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, (off_t)0, SEEK_SET) == -1 ||
write(fd, ep, sizeof(EXEC)) != sizeof(EXEC) ||
ftruncate(fd, fsize)) {
warn("%s", fn);
err_val = 1;
}
}
void
s_stab(fn, fd, ep)
const char *fn;
int fd;
EXEC *ep;
{
register int cnt, len;
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;
/* Stat the file. */
if (fstat(fd, &sb) < 0) {
warn("%s", fn);
err_val = 1;
return;
}
/* Check size. */
if (sb.st_size > SIZE_T_MAX) {
warnx("%s: %s", fn, strerror(EFBIG));
err_val = 1;
return;
}
/* Map the file. */
if ((ep = (EXEC *)mmap(NULL, (size_t)sb.st_size,
PROT_READ | PROT_WRITE, MAP_SHARED, fd, (off_t)0)) == (EXEC *)MAP_FAILED) {
warn("%s", fn);
err_val = 1;
return;
}
/*
* 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((size_t)*(u_long *)strbase)) == NULL) {
warn(NULL);
err_val = 1;
munmap((caddr_t)ep, sb.st_size);
return;
}
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;
if (xflag &&
(!(sym->n_type & N_EXT) ||
(sym->n_type & ~N_EXT) == N_FN ||
strcmp(p, "gcc_compiled.") == 0 ||
strcmp(p, "gcc2_compiled.") == 0 ||
strcmp(p, "___gnu_compiled_c") == 0))
continue;
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)) {
warn("%s", fn);
err_val = 1;
}
munmap((caddr_t)ep, (size_t)sb.st_size);
}
static void
usage()
{
(void)fprintf(stderr, "usage: strip [-dx] file ...\n");
exit(1);
}