NetBSD/usr.bin/strip/strip.c

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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
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/*static char sccsid[] = "from: @(#)strip.c 5.8 (Berkeley) 11/6/91";*/
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static char rcsid[] = "$Id: strip.c,v 1.6 1993/09/07 16:12:15 brezak Exp $";
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#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
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#include <sys/mman.h>
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#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;
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#define strx n_un.n_strx
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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));
int xflag = 0;
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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, "dx")) != EOF)
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switch(ch) {
case 'x':
xflag = 1;
/*FALLTHROUGH*/
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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));
}
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exit(0);
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}
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; OMAGIC
* and NMAGIC formats have the text/data immediately following the
* header. ZMAGIC format wastes the rest of of header page.
*/
fsize = N_RELOFF(*ep);
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/* 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;
{
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register int cnt, len, nsymcnt;
register char *nstr, *nstrbase, *p, *strbase;
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. */
if (ep->a_syms == 0)
return;
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/* 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));
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/*
* 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));
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/*
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* Allocate space for the new string table, initialize old and
* new string pointers. Handle the extra long at the beginning
* of the string table.
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*/
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strbase = (char *)ep + N_STROFF(*ep);
if ((nstrbase = malloc((u_int)*(u_long *)strbase)) == NULL)
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err("%s", strerror(errno));
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nstr = nstrbase + sizeof(u_long);
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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
* track of the number of symbols.
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*/
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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) ||
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(sym->n_type & ~N_EXT) == N_FN ||
strcmp(p, "gcc_compiled.") == 0 ||
strcmp(p, "gcc2_compiled.") == 0 ||
strcmp(p, "___gnu_compiled_c") == 0)) {
continue;
}
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len = strlen(p) + 1;
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bcopy(p, nstr, len);
nstr += len;
++nsym;
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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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/*
* Copy the new string table into place. Nsym should be pointing
* at the address past the last symbol entry.
*/
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))
err("%s: %s", fn, strerror(errno));
munmap((caddr_t)ep, sb.st_size);
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}
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");
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exit(1);
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}