| 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 | } |