usr.bin/ranlib/build.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Hugh Smith at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)build.c  8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/ranlib/build.c,v 1.7 1999/08/28 01:05:01 peter Exp $
  38  * $DragonFly: src/usr.bin/ranlib/build.c,v 1.4 2004/07/24 13:45:44 eirikn Exp $
  39  */
  40
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43
  44 #include <a.out.h>
  45 #include <ar.h>
  46 #include <dirent.h>
  47 #include <fcntl.h>
  48 #include <ranlib.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53
  54 #include "archive.h"
  55
  56 extern int tmp( void );
  57 extern void error( char * );
  58 extern void badfmt( void );
  59 extern void settime( int );
  60
  61 extern CHDR chdr;                       /* converted header */
  62 extern char *archive;                   /* archive name */
  63 extern char *tname;                     /* temporary file "name" */
  64
  65 typedef struct _rlib {
  66         struct _rlib *next;             /* next structure */
  67         off_t pos;                      /* offset of defining archive file */
  68         char *sym;                      /* symbol */
  69         int symlen;                     /* strlen(sym) */
  70 } RLIB;
  71 RLIB *rhead, **pnext;
  72
  73 FILE *fp;
  74
  75 long symcnt;                            /* symbol count */
  76 long tsymlen;                           /* total string length */
  77
  78 static void rexec(int, int);
  79 static void symobj(void);
  80
  81 int
  82 build(void)
  83 {
  84         CF cf;
  85         int afd, tfd;
  86         off_t size;
  87
  88         afd = open_archive(O_RDWR);
  89         fp = fdopen(afd, "r+");
  90         tfd = tmp();
  91
  92         SETCF(afd, archive, tfd, tname, RPAD|WPAD);
  93
  94         /* Read through the archive, creating list of symbols. */
  95         pnext = &rhead;
  96         symcnt = tsymlen = 0;
  97         while(get_arobj(afd)) {
  98                 if (!strcmp(chdr.name, RANLIBMAG)) {
  99                         skip_arobj(afd);
 100                         continue;
 101                 }
 102                 rexec(afd, tfd);
 103                 put_arobj(&cf, (struct stat *)NULL);
 104         }
 105         *pnext = NULL;
 106
 107         /* Create the symbol table. */
 108         symobj();
 109
 110         /* Copy the saved objects into the archive. */
 111         size = lseek(tfd, (off_t)0, SEEK_CUR);
 112         (void)lseek(tfd, (off_t)0, SEEK_SET);
 113         SETCF(tfd, tname, afd, archive, WPAD);
 114         copy_ar(&cf, size);
 115         (void)ftruncate(afd, lseek(afd, (off_t)0, SEEK_CUR));
 116         (void)close(tfd);
 117
 118         /* Set the time. */
 119         settime(afd);
 120         close_archive(afd);
 121         return(0);
 122 }
 123
 124 /*
 125  * rexec
 126  *      Read the exec structure; ignore any files that don't look
 127  *      exactly right.
 128  */
 129 static void
 130 rexec(int rfd, int wfd)
 131 {
 132         register RLIB *rp;
 133         register long nsyms;
 134         register int nr, symlen;
 135         register char *strtab = 0, *sym;
 136         struct exec ebuf;
 137         struct nlist nl;
 138         off_t r_off, w_off;
 139         long strsize;
 140         void *emalloc();
 141
 142         /* Get current offsets for original and tmp files. */
 143         r_off = lseek(rfd, (off_t)0, SEEK_CUR);
 144         w_off = lseek(wfd, (off_t)0, SEEK_CUR);
 145
 146         /* Read in exec structure. */
 147         nr = read(rfd, &ebuf, sizeof(struct exec));
 148         if (nr != sizeof(struct exec))
 149                 goto badread;
 150
 151         /* Check magic number and symbol count. */
 152         if (N_BADMAG(ebuf) || ebuf.a_syms == 0)
 153                 goto bad1;
 154
 155         /* Seek to string table. */
 156         if (lseek(rfd, r_off + N_STROFF(ebuf), SEEK_SET) == (off_t)-1)
 157                 error(archive);
 158
 159         /* Read in size of the string table. */
 160         nr = read(rfd, &strsize, sizeof(strsize));
 161         if (nr != sizeof(strsize))
 162                 goto badread;
 163
 164         /* Read in the string table. */
 165         strsize -= sizeof(strsize);
 166         strtab = emalloc(strsize);
 167         nr = read(rfd, strtab, strsize);
 168         if (nr != strsize) {
 169 badread:        if (nr < 0)
 170                         error(archive);
 171                 goto bad2;
 172         }
 173
 174         /* Seek to symbol table. */
 175         if (fseek(fp, (long)r_off + N_SYMOFF(ebuf), SEEK_SET))
 176                 goto bad2;
 177
 178         /* For each symbol read the nlist entry and save it as necessary. */
 179         nsyms = ebuf.a_syms / sizeof(struct nlist);
 180         while (nsyms--) {
 181                 if (!fread(&nl, sizeof(struct nlist), 1, fp)) {
 182                         if (feof(fp))
 183                                 badfmt();
 184                         error(archive);
 185                 }
 186
 187                 /* Ignore if no name or local. */
 188                 if (!nl.n_un.n_strx || !(nl.n_type & N_EXT))
 189                         continue;
 190
 191                 /*
 192                  * If the symbol is an undefined external and the n_value
 193                  * field is non-zero, keep it.
 194                  */
 195                 if ((nl.n_type & N_TYPE) == N_UNDF && !nl.n_value)
 196                         continue;
 197
 198                 /* First four bytes are the table size. */
 199                 sym = strtab + nl.n_un.n_strx - sizeof(long);
 200                 symlen = strlen(sym) + 1;
 201
 202                 rp = (RLIB *)emalloc(sizeof(RLIB));
 203                 rp->sym = (char *)emalloc(symlen);
 204                 bcopy(sym, rp->sym, symlen);
 205                 rp->symlen = symlen;
 206                 rp->pos = w_off;
 207
 208                 /* Build in forward order for "ar -m" command. */
 209                 *pnext = rp;
 210                 pnext = &rp->next;
 211
 212                 ++symcnt;
 213                 tsymlen += symlen;
 214         }
 215
 216 bad2:   free(strtab);
 217 bad1:   (void)lseek(rfd, r_off, SEEK_SET);
 218 }
 219
 220 /*
 221  * symobj --
 222  *      Write the symbol table into the archive, computing offsets as
 223  *      writing.
 224  */
 225 static void
 226 symobj(void)
 227 {
 228         register RLIB *rp, *rpnext;
 229         struct ranlib rn;
 230         off_t ransize;
 231         long size, stroff;
 232         char hb[sizeof(struct ar_hdr) + 1], pad;
 233
 234         /* Rewind the archive, leaving the magic number. */
 235         if (fseek(fp, (long)SARMAG, SEEK_SET))
 236                 error(archive);
 237
 238         /* Size of the ranlib archive file, pad if necessary. */
 239         ransize = sizeof(long) +
 240             symcnt * sizeof(struct ranlib) + sizeof(long) + tsymlen;
 241         if (ransize & 01) {
 242                 ++ransize;
 243                 pad = '\n';
 244         } else
 245                 pad = '\0';
 246
 247         /* Put out the ranlib archive file header. */
 248 #define DEFMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
 249         (void)sprintf(hb, HDR2, RANLIBMAG, 0L, getuid(), getgid(),
 250             DEFMODE & ~umask(0), ransize, ARFMAG);
 251         if (!fwrite(hb, sizeof(struct ar_hdr), 1, fp))
 252                 error(tname);
 253
 254         /* First long is the size of the ranlib structure section. */
 255         size = symcnt * sizeof(struct ranlib);
 256         if (!fwrite(&size, sizeof(size), 1, fp))
 257                 error(tname);
 258
 259         /* Offset of the first archive file. */
 260         size = SARMAG + sizeof(struct ar_hdr) + ransize;
 261
 262         /*
 263          * Write out the ranlib structures.  The offset into the string
 264          * table is cumulative, the offset into the archive is the value
 265          * set in rexec() plus the offset to the first archive file.
 266          */
 267         for (rp = rhead, stroff = 0; rp; rp = rp->next) {
 268                 rn.ran_un.ran_strx = stroff;
 269                 stroff += rp->symlen;
 270                 rn.ran_off = size + rp->pos;
 271                 if (!fwrite(&rn, sizeof(struct ranlib), 1, fp))
 272                         error(archive);
 273         }
 274
 275         /* Second long is the size of the string table. */
 276         if (!fwrite(&tsymlen, sizeof(tsymlen), 1, fp))
 277                 error(tname);
 278
 279         /* Write out the string table. */
 280         for (rp = rhead; rp; rp = rpnext) {
 281                 if (!fwrite(rp->sym, rp->symlen, 1, fp))
 282                         error(tname);
 283                 rpnext = rp->next;
 284                 free(rp->sym);
 285                 free(rp);
 286         }
 287         rhead = NULL;
 288
 289         if (pad && !fwrite(&pad, sizeof(pad), 1, fp))
 290                 error(tname);
 291
 292         (void)fflush(fp);
 293 }