[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[] = "@(#)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;
{
	static int pagesize = -1;
	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.
	 */
	if (ep->a_magic == ZMAGIC)
		fsize = pagesize == -1 ? (pagesize = getpagesize()) : pagesize;
	else
		fsize = sizeof(EXEC);
	fsize += ep->a_text + 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, 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;
}
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
	41	static char sccsid[] = "@(#)strip.c 5.7 (Berkeley) 5/26/91";
	42	#endif /* not lint */
	43
	44	#include <sys/types.h>
	45	#include <sys/stat.h>
	46	#include <fcntl.h>
	47	#include <errno.h>
	48	#include <a.out.h>
	49	#include <unistd.h>
	50	#include <stdio.h>
	51	#include <stdlib.h>
	52	#include <string.h>
	53
	54	typedef struct exec EXEC;
	55	typedef struct nlist NLIST;
	56
	57	void err __P((const char *fmt, ...));
	58	void s_stab __P((const char , int, EXEC ));
	59	void s_sym __P((const char , int, EXEC ));
	60	void usage __P((void));
	61
	62	int eval;
	63
	64	main(argc, argv)
65	int argc;
66	char *argv[];
67	{
68	register int fd, nb;
69	EXEC head;
70	void (sfcn)__P((const char , int, EXEC *));
71	int ch;
72	char *fn;
73
74	sfcn = s_sym;
75	while ((ch = getopt(argc, argv, "d")) != EOF)
76	switch(ch) {
77	case 'd':
78	sfcn = s_stab;
79	break;
80	case '?':
81	default:
82	usage();
83	}
84	argc -= optind;
85	argv += optind;
86
87	while (fn = *argv++) {
88	if ((fd = open(fn, O_RDWR)) < 0 \|\|
89	(nb = read(fd, &head, sizeof(EXEC))) == -1) {
90	err("%s: %s", fn, strerror(errno));
91	continue;
92	}
93	if (nb != sizeof(EXEC) \|\| N_BADMAG(head)) {
94	err("%s: %s", fn, strerror(EFTYPE));
95	continue;
96	}
97	sfcn(fn, fd, &head);
98	if (close(fd))
99	err("%s: %s", fn, strerror(errno));
100	}
101	exit(eval);
102	}
103
104	void
105	s_sym(fn, fd, ep)
106	const char *fn;
107	int fd;
108	register EXEC *ep;
109	{
110	static int pagesize = -1;
111	register off_t fsize;
112
113	/* If no symbols or data/text relocation info, quit. */
114	if (!ep->a_syms && !ep->a_trsize && !ep->a_drsize)
115	return;
116
117	/*
118	* New file size is the header plus text and data segments; OMAGIC
119	* and NMAGIC formats have the text/data immediately following the
120	* header. ZMAGIC format wastes the rest of of header page.
121	*/
122	if (ep->a_magic == ZMAGIC)
123	fsize = pagesize == -1 ? (pagesize = getpagesize()) : pagesize;
124	else
125	fsize = sizeof(EXEC);
126	fsize += ep->a_text + ep->a_data;
127
128	/* Set symbol size and relocation info values to 0. */
129	ep->a_syms = ep->a_trsize = ep->a_drsize = 0;
130
131	/* Rewrite the header and truncate the file. */
132	if (lseek(fd, 0L, SEEK_SET) == -1 \|\|
133	write(fd, ep, sizeof(EXEC)) != sizeof(EXEC) \|\|
134	ftruncate(fd, fsize))
135	err("%s: %s", fn, strerror(errno));
136	}
137
138	void
139	s_stab(fn, fd, ep)
140	const char *fn;
141	int fd;
142	EXEC *ep;
143	{
144	struct stat sb;
145	register NLIST bsym2, sym1, *sym2;
146	register u_long nsym1, nsym2;
147	register char p, bstr2, str1, str2;
148	register int len, symlen;
149	off_t fsize;
150	int nb;
151	char *bp;
152
153	/* Quit if no symbols. */
154	if (ep->a_syms == 0)
155	return;
156
157	bsym2 = NULL;
158	bp = bstr2 = NULL;
159
160	/* Read the file into memory. XXX mmap */
161	if (fstat(fd, &sb))
162	goto syserr;
163	if ((bp = malloc(sb.st_size)) == NULL)
164	goto syserr;
165	if (lseek(fd, 0L, SEEK_SET) == -1)
166	goto syserr;
167	if ((nb = read(fd, bp, (int)sb.st_size)) == -1)
168	goto syserr;
169	if (nb != sb.st_size) {
170	errno = EIO;
171	goto syserr;
172	}
173
174	/*
175	* Allocate space for new symbol and string tables. Allocate before
176	* reading the symbol tables so we can do it all in a single pass.
177	* This loses if there weren't any symbols to strip, but that's life.
178	*/
179	sym1 = (NLIST )(bp + N_SYMOFF(ep));
180	if ((bsym2 = sym2 = malloc((u_int)ep->a_syms)) == NULL) {
181	err("%s", strerror(errno));
182	goto mem;
183	}
184	str1 = bp + N_STROFF(*ep);
185	if ((bstr2 = malloc((u_int)(u_long )str1)) == NULL) {
186	err("%s", strerror(errno));
187	goto mem;
188	}
189	str2 = bstr2 + sizeof(u_long);
190	symlen = sizeof(u_long);
191
192	/*
193	* Read through the symbol table. For each non-debugging symbol,
194	* copy it into the new symbol and string tables. Keep track of
195	* how many symbols are copied and the length of the new string
196	* table.
197	*/
198	#define strx n_un.n_strx
199	nsym2 = 0;
200	for (nsym1 = ep->a_syms / sizeof(NLIST); nsym1--; ++sym1)
201	if (!(sym1->n_type & N_STAB) && sym1->strx) {
202	sym2 = sym1;
203	sym2->strx = str2 - bstr2;
204	p = str1 + sym1->strx;
205	len = strlen(p) + 1;
206	bcopy(p, str2, len);
207	symlen += len;
208	str2 += len;
209	++sym2;
210	++nsym2;
211	}
212
213	/* If no debugging symbols, quit. */
214	if (!nsym2)
215	goto mem;
216
217	/* Fill in new symbol table size. */
218	ep->a_syms = nsym2 * sizeof(NLIST);
219
220	/* Write out the header. */
221	if (lseek(fd, 0L, SEEK_SET) == -1 \|\|
222	write(fd, ep, sizeof(EXEC)) != sizeof(EXEC))
223	goto syserr;
224
225	/* Write out the symbol table. */
226	if (lseek(fd, N_SYMOFF(*ep), SEEK_SET) == -1 \|\|
227	write(fd, bsym2, ep->a_syms) != ep->a_syms)
228	goto syserr;
229
230	/* Fill in the new size of the string table. */
231	(u_long )bstr2 = symlen;
232
233	/* Write out the string table. */
234	if (write(fd, bstr2, symlen) != symlen)
235	goto syserr;
236
237	/* Truncate to the current length. */
238	if ((fsize = lseek(fd, 0L, SEEK_CUR)) == -1)
239	goto syserr;
240	if (ftruncate(fd, fsize))
241	syserr: err("%s: %s", fn, strerror(errno));
242
243	mem: if (bp)
244	free(bp);
245	if (bstr2)
246	free(bstr2);
247	if (bsym2)
248	free(bsym2);
249	}
250
251	void
252	usage()
253	{
254
255	(void)fprintf(stderr, "usage: strip [-d] file ...\n");
256	exit(1);
257	}
258
259	#if __STDC__
260	#include <stdarg.h>
261	#else
262	#include <varargs.h>
263	#endif
264
265	void
266	#if __STDC__
267	err(const char *fmt, ...)
268	#else
269	err(fmt, va_alist)
270	char *fmt;
271	va_dcl
272	#endif
273	{
274	va_list ap;
275	#if __STDC__
276	va_start(ap, fmt);
277	#else
278	va_start(ap);
279	#endif
280	(void)fprintf(stderr, "strip: ");
281	(void)vfprintf(stderr, fmt, ap);
282	va_end(ap);
283	(void)fprintf(stderr, "\n");
284	eval = 1;
285	}