[unix-history] / usr.bin / strip / strip.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[] = "from: @(#)strip.c	5.8 (Berkeley) 11/6/91";*/
static char rcsid[] = "$Id: strip.c,v 1.6 1993/09/07 16:12:15 brezak Exp $";
#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));

int xflag = 0;
        
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)
		switch(ch) {
                case 'x':
                        xflag = 1;
                        /*FALLTHROUGH*/
		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;
{
	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;
{
	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;
                        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))
		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);
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1988 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#ifndef lint
	35	char copyright[] =
	36	"@(#) Copyright (c) 1988 Regents of the University of California.\n\
	37	All rights reserved.\n";
	38	#endif /* not lint */
	39
	40	#ifndef lint
8bcfe259 RG	41	/static char sccsid[] = "from: @(#)strip.c 5.8 (Berkeley) 11/6/91";/
8bcfe259 RG	42	static char rcsid[] = "$Id: strip.c,v 1.6 1993/09/07 16:12:15 brezak Exp $";
15637ed4 RG	43	#endif /* not lint */
	44
	45	#include <sys/types.h>
	46	#include <sys/stat.h>
d803fffd	47	#include <sys/mman.h>
15637ed4 RG	48	#include <fcntl.h>
	49	#include <errno.h>
	50	#include <a.out.h>
	51	#include <unistd.h>
	52	#include <stdio.h>
	53	#include <stdlib.h>
	54	#include <string.h>
	55
	56	typedef struct exec EXEC;
	57	typedef struct nlist NLIST;
	58
d803fffd AM	59	#define strx n_un.n_strx
d803fffd AM	60
15637ed4 RG	61	void err __P((const char *fmt, ...));
	62	void s_stab __P((const char , int, EXEC ));
	63	void s_sym __P((const char , int, EXEC ));
	64	void usage __P((void));
	65
8bcfe259 RG	66	int xflag = 0;
8bcfe259 RG	67
15637ed4 RG	68	main(argc, argv)
	69	int argc;
	70	char *argv[];
	71	{
	72	register int fd, nb;
	73	EXEC head;
	74	void (sfcn)__P((const char , int, EXEC *));
	75	int ch;
	76	char *fn;
	77
	78	sfcn = s_sym;
8bcfe259	79	while ((ch = getopt(argc, argv, "dx")) != EOF)
15637ed4	80	switch(ch) {
8bcfe259 RG	81	case 'x':
	82	xflag = 1;
	83	/FALLTHROUGH/
15637ed4 RG	84	case 'd':
	85	sfcn = s_stab;
	86	break;
	87	case '?':
	88	default:
	89	usage();
	90	}
	91	argc -= optind;
	92	argv += optind;
	93
	94	while (fn = *argv++) {
	95	if ((fd = open(fn, O_RDWR)) < 0 \|\|
	96	(nb = read(fd, &head, sizeof(EXEC))) == -1) {
	97	err("%s: %s", fn, strerror(errno));
	98	continue;
	99	}
	100	if (nb != sizeof(EXEC) \|\| N_BADMAG(head)) {
	101	err("%s: %s", fn, strerror(EFTYPE));
	102	continue;
	103	}
	104	sfcn(fn, fd, &head);
	105	if (close(fd))
	106	err("%s: %s", fn, strerror(errno));
	107	}
d803fffd	108	exit(0);
15637ed4 RG	109	}
	110
	111	void
	112	s_sym(fn, fd, ep)
	113	const char *fn;
	114	int fd;
	115	register EXEC *ep;
	116	{
15637ed4 RG	117	register off_t fsize;
	118
	119	/* If no symbols or data/text relocation info, quit. */
	120	if (!ep->a_syms && !ep->a_trsize && !ep->a_drsize)
	121	return;
	122
	123	/*
	124	* New file size is the header plus text and data segments; OMAGIC
	125	* and NMAGIC formats have the text/data immediately following the
	126	* header. ZMAGIC format wastes the rest of of header page.
	127	*/
8bcfe259	128	fsize = N_RELOFF(*ep);
15637ed4 RG	129
	130	/* Set symbol size and relocation info values to 0. */
	131	ep->a_syms = ep->a_trsize = ep->a_drsize = 0;
	132
	133	/* Rewrite the header and truncate the file. */
	134	if (lseek(fd, 0L, SEEK_SET) == -1 \|\|
	135	write(fd, ep, sizeof(EXEC)) != sizeof(EXEC) \|\|
	136	ftruncate(fd, fsize))
	137	err("%s: %s", fn, strerror(errno));
	138	}
	139
	140	void
	141	s_stab(fn, fd, ep)
	142	const char *fn;
	143	int fd;
	144	EXEC *ep;
	145	{
d803fffd AM	146	register int cnt, len, nsymcnt;
	147	register char nstr, nstrbase, p, strbase;
	148	register NLIST sym, nsym;
15637ed4	149	struct stat sb;
d803fffd	150	NLIST *symbase;
15637ed4 RG	151
	152	/* Quit if no symbols. */
	153	if (ep->a_syms == 0)
	154	return;
	155
d803fffd AM	156	/* Map the file. */
	157	if (fstat(fd, &sb) \|\|
	158	(ep = (EXEC *)mmap(NULL, sb.st_size, PROT_READ \| PROT_WRITE,
	159	MAP_FILE \| MAP_SHARED, fd, (off_t)0)) == (EXEC *)-1)
	160	err("%s: %s", fn, strerror(errno));
15637ed4	161
d803fffd AM	162	/*
	163	* Initialize old and new symbol pointers. They both point to the
	164	* beginning of the symbol table in memory, since we're deleting
	165	* entries.
	166	*/
	167	sym = nsym = symbase = (NLIST )((char )ep + N_SYMOFF(*ep));
15637ed4 RG	168
15637ed4 RG	169	/*
d803fffd AM	170	* Allocate space for the new string table, initialize old and
	171	* new string pointers. Handle the extra long at the beginning
	172	* of the string table.
15637ed4	173	*/
d803fffd AM	174	strbase = (char )ep + N_STROFF(ep);
d803fffd AM	175	if ((nstrbase = malloc((u_int)(u_long )strbase)) == NULL)
15637ed4	176	err("%s", strerror(errno));
d803fffd	177	nstr = nstrbase + sizeof(u_long);
15637ed4 RG	178
	179	/*
	180	* Read through the symbol table. For each non-debugging symbol,
d803fffd AM	181	* copy it and save its string in the new string table. Keep
d803fffd AM	182	* track of the number of symbols.
15637ed4	183	*/
d803fffd AM	184	for (cnt = ep->a_syms / sizeof(NLIST); cnt--; ++sym)
	185	if (!(sym->n_type & N_STAB) && sym->strx) {
	186	nsym = sym;
	187	nsym->strx = nstr - nstrbase;
	188	p = strbase + sym->strx;
8bcfe259 RG	189	if (xflag &&
	190	(!(sym->n_type & N_EXT) \|\|
	191	(sym->n_type & ~N_EXT) == N_FN \|\|
	192	strcmp(p, "gcc_compiled.") == 0 \|\|
	193	strcmp(p, "gcc2_compiled.") == 0 \|\|
	194	strcmp(p, "___gnu_compiled_c") == 0)) {
	195	continue;
	196	}
15637ed4	197	len = strlen(p) + 1;
d803fffd AM	198	bcopy(p, nstr, len);
	199	nstr += len;
	200	++nsym;
15637ed4 RG	201	}
15637ed4 RG	202
15637ed4	203	/* Fill in new symbol table size. */
d803fffd	204	ep->a_syms = (nsym - symbase) * sizeof(NLIST);
15637ed4 RG	205
15637ed4 RG	206	/* Fill in the new size of the string table. */
d803fffd	207	(u_long )nstrbase = len = nstr - nstrbase;
15637ed4	208
d803fffd AM	209	/*
	210	* Copy the new string table into place. Nsym should be pointing
	211	* at the address past the last symbol entry.
	212	*/
	213	bcopy(nstrbase, (void *)nsym, len);
15637ed4 RG	214
15637ed4 RG	215	/* Truncate to the current length. */
d803fffd AM	216	if (ftruncate(fd, (char )nsym + len - (char )ep))
	217	err("%s: %s", fn, strerror(errno));
	218	munmap((caddr_t)ep, sb.st_size);
15637ed4 RG	219	}
	220
	221	void
	222	usage()
	223	{
15637ed4 RG	224	(void)fprintf(stderr, "usage: strip [-d] file ...\n");
	225	exit(1);
	226	}
	227
	228	#if __STDC__
	229	#include <stdarg.h>
	230	#else
	231	#include <varargs.h>
	232	#endif
	233
	234	void
	235	#if __STDC__
	236	err(const char *fmt, ...)
	237	#else
	238	err(fmt, va_alist)
	239	char *fmt;
	240	va_dcl
	241	#endif
	242	{
	243	va_list ap;
	244	#if __STDC__
	245	va_start(ap, fmt);
	246	#else
	247	va_start(ap);
	248	#endif
	249	(void)fprintf(stderr, "strip: ");
	250	(void)vfprintf(stderr, fmt, ap);
	251	va_end(ap);
	252	(void)fprintf(stderr, "\n");
d803fffd	253	exit(1);
15637ed4	254	}