NetBSD/usr.bin/strip/strip.c

281 lines
6.8 KiB
C

/*
* 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 5.7 (Berkeley) 5/26/91";
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.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;
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 eval;
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(eval);
}
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);
/* 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;
{
struct stat sb;
register NLIST *bsym2, *sym1, *sym2;
register u_long nsym1, nsym2;
register char *p, *bstr2, *str1, *str2;
register int len, symlen;
off_t fsize;
int nb;
char *bp;
/* Quit if no symbols. */
if (ep->a_syms == 0)
return;
bsym2 = NULL;
bp = bstr2 = NULL;
/* Read the file into memory. XXX mmap */
if (fstat(fd, &sb))
goto syserr;
if ((bp = malloc(sb.st_size)) == NULL)
goto syserr;
if (lseek(fd, 0L, SEEK_SET) == -1)
goto syserr;
if ((nb = read(fd, bp, (int)sb.st_size)) == -1)
goto syserr;
if (nb != sb.st_size) {
errno = EIO;
goto syserr;
}
/*
* Allocate space for new symbol and string tables. Allocate before
* reading the symbol tables so we can do it all in a single pass.
* This loses if there weren't any symbols to strip, but that's life.
*/
sym1 = (NLIST *)(bp + N_SYMOFF(*ep));
if ((bsym2 = sym2 = malloc((u_int)ep->a_syms)) == NULL) {
err("%s", strerror(errno));
goto mem;
}
str1 = bp + N_STROFF(*ep);
if ((bstr2 = malloc((u_int)*(u_long *)str1)) == NULL) {
err("%s", strerror(errno));
goto mem;
}
str2 = bstr2 + sizeof(u_long);
symlen = sizeof(u_long);
/*
* Read through the symbol table. For each non-debugging symbol,
* copy it into the new symbol and string tables. Keep track of
* how many symbols are copied and the length of the new string
* table.
*/
#define strx n_un.n_strx
nsym2 = 0;
for (nsym1 = ep->a_syms / sizeof(NLIST); nsym1--; ++sym1)
if (!(sym1->n_type & N_STAB) && sym1->strx) {
*sym2 = *sym1;
sym2->strx = str2 - bstr2;
p = str1 + sym1->strx;
len = strlen(p) + 1;
bcopy(p, str2, len);
symlen += len;
str2 += len;
++sym2;
++nsym2;
}
/* If no debugging symbols, quit. */
if (!nsym2)
goto mem;
/* Fill in new symbol table size. */
ep->a_syms = nsym2 * sizeof(NLIST);
/* Write out the header. */
if (lseek(fd, 0L, SEEK_SET) == -1 ||
write(fd, ep, sizeof(EXEC)) != sizeof(EXEC))
goto syserr;
/* Write out the symbol table. */
if (lseek(fd, N_SYMOFF(*ep), SEEK_SET) == -1 ||
write(fd, bsym2, ep->a_syms) != ep->a_syms)
goto syserr;
/* Fill in the new size of the string table. */
*(u_long *)bstr2 = symlen;
/* Write out the string table. */
if (write(fd, bstr2, symlen) != symlen)
goto syserr;
/* Truncate to the current length. */
if ((fsize = lseek(fd, 0L, SEEK_CUR)) == -1)
goto syserr;
if (ftruncate(fd, fsize))
syserr: err("%s: %s", fn, strerror(errno));
mem: if (bp)
free(bp);
if (bstr2)
free(bstr2);
if (bsym2)
free(bsym2);
}
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");
eval = 1;
}