284 lines
7.7 KiB
C
284 lines
7.7 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Hugh Smith at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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/*static char sccsid[] = "from: @(#)build.c 5.3 (Berkeley) 3/12/91";*/
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static char rcsid[] = "$Id: build.c,v 1.4 1994/03/31 11:12:40 deraadt Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <a.out.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <ar.h>
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#include <ranlib.h>
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#include <stdio.h>
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#include <archive.h>
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extern CHDR chdr; /* converted header */
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extern char *archive; /* archive name */
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extern char *tname; /* temporary file "name" */
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typedef struct _rlib {
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struct _rlib *next; /* next structure */
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off_t pos; /* offset of defining archive file */
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char *sym; /* symbol */
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int symlen; /* strlen(sym) */
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} RLIB;
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RLIB *rhead, **pnext;
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static FILE *fp;
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static long symcnt; /* symbol count */
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static long tsymlen; /* total string length */
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static void rexec(), symobj();
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extern void *emalloc();
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build()
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{
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CF cf;
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int afd, tfd;
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off_t size;
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afd = open_archive(O_RDWR);
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fp = fdopen(afd, "r+");
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tfd = tmp();
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SETCF(afd, archive, tfd, tname, RPAD|WPAD);
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/* Read through the archive, creating list of symbols. */
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symcnt = tsymlen = 0;
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pnext = &rhead;
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while(get_arobj(afd)) {
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if (!strcmp(chdr.name, RANLIBMAG)) {
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skip_arobj(afd);
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continue;
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}
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rexec(afd, tfd);
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put_arobj(&cf, (struct stat *)NULL);
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}
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*pnext = NULL;
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/* Create the symbol table. */
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symobj();
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/* Copy the saved objects into the archive. */
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size = lseek(tfd, (off_t)0, SEEK_CUR);
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(void)lseek(tfd, (off_t)0, SEEK_SET);
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SETCF(tfd, tname, afd, archive, RPAD|WPAD);
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copy_ar(&cf, size);
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(void)ftruncate(afd, lseek(afd, (off_t)0, SEEK_CUR));
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(void)close(tfd);
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/* Set the time. */
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settime(afd);
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close_archive(afd);
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return(0);
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}
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/*
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* rexec
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* Read the exec structure; ignore any files that don't look
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* exactly right.
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*/
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static void
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rexec(rfd, wfd)
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register int rfd;
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int wfd;
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{
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register RLIB *rp;
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register long nsyms;
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register int nr, symlen;
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register char *strtab, *sym;
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struct exec ebuf;
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struct nlist nl;
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off_t r_off, w_off;
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long strsize;
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/* Get current offsets for original and tmp files. */
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r_off = lseek(rfd, (off_t)0, SEEK_CUR);
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w_off = lseek(wfd, (off_t)0, SEEK_CUR);
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/* Read in exec structure. */
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nr = read(rfd, (char *)&ebuf, sizeof(struct exec));
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if (nr != sizeof(struct exec))
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goto badread;
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/* Check magic number and symbol count. */
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if (N_BADMAG(ebuf) || ebuf.a_syms == 0)
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goto bad1;
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/* Seek to string table. */
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if (lseek(rfd, N_STROFF(ebuf) + r_off, SEEK_SET) == (off_t)-1)
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error(archive);
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/* Read in size of the string table. */
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nr = read(rfd, (char *)&strsize, sizeof(strsize));
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if (nr != sizeof(strsize))
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goto badread;
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/* Read in the string table. */
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strsize -= sizeof(strsize);
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strtab = (char *)emalloc(strsize);
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nr = read(rfd, strtab, strsize);
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if (nr != strsize) {
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badread: if (nr < 0)
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error(archive);
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goto bad2;
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}
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/* Seek to symbol table. */
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if (fseek(fp, N_SYMOFF(ebuf) + r_off, SEEK_SET) == (off_t)-1)
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goto bad2;
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/* For each symbol read the nlist entry and save it as necessary. */
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nsyms = ebuf.a_syms / sizeof(struct nlist);
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while (nsyms--) {
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if (!fread((char *)&nl, sizeof(struct nlist), 1, fp)) {
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if (feof(fp))
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badfmt();
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error(archive);
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}
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/* Ignore if no name or local. */
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if (!nl.n_un.n_strx || !(nl.n_type & N_EXT))
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continue;
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/*
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* If the symbol is an undefined external and the n_value
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* field is non-zero, keep it.
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*/
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if ((nl.n_type & N_TYPE) == N_UNDF && !nl.n_value)
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continue;
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/* First four bytes are the table size. */
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sym = strtab + nl.n_un.n_strx - sizeof(long);
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symlen = strlen(sym) + 1;
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rp = (RLIB *)emalloc(sizeof(RLIB));
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rp->sym = (char *)emalloc(symlen);
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bcopy(sym, rp->sym, symlen);
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rp->symlen = symlen;
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rp->pos = w_off;
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/* Build in forward order for "ar -m" command. */
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*pnext = rp;
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pnext = &rp->next;
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++symcnt;
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tsymlen += symlen;
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}
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bad2: free(strtab);
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bad1: (void)lseek(rfd, (off_t)r_off, SEEK_SET);
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}
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/*
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* symobj --
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* Write the symbol table into the archive, computing offsets as
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* writing.
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*/
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static void
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symobj()
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{
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register RLIB *rp, *rnext;
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struct ranlib rn;
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char hb[sizeof(struct ar_hdr) + 1], pad;
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long ransize, size, stroff;
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/* Rewind the archive, leaving the magic number. */
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if (fseek(fp, (off_t)SARMAG, SEEK_SET) == (off_t)-1)
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error(archive);
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/* Size of the ranlib archive file, pad if necessary. */
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ransize = sizeof(long) +
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symcnt * sizeof(struct ranlib) + sizeof(long) + tsymlen;
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if (ransize & 01) {
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++ransize;
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pad = '\n';
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} else
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pad = '\0';
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/* Put out the ranlib archive file header. */
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#define DEFMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
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(void)sprintf(hb, HDR2, RANLIBMAG, 0L, getuid(), getgid(),
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DEFMODE & ~umask(0), (off_t)ransize, ARFMAG);
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if (!fwrite(hb, sizeof(struct ar_hdr), 1, fp))
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error(tname);
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/* First long is the size of the ranlib structure section. */
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size = symcnt * sizeof(struct ranlib);
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if (!fwrite((char *)&size, sizeof(size), 1, fp))
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error(tname);
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/* Offset of the first archive file. */
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size = SARMAG + sizeof(struct ar_hdr) + ransize;
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/*
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* Write out the ranlib structures. The offset into the string
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* table is cumulative, the offset into the archive is the value
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* set in rexec() plus the offset to the first archive file.
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*/
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for (rp = rhead, stroff = 0; rp; rp = rp->next) {
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rn.ran_un.ran_strx = stroff;
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stroff += rp->symlen;
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rn.ran_off = size + rp->pos;
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if (!fwrite((char *)&rn, sizeof(struct ranlib), 1, fp))
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error(archive);
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}
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/* Second long is the size of the string table. */
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if (!fwrite((char *)&tsymlen, sizeof(tsymlen), 1, fp))
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error(tname);
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/* Write out the string table. */
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for (rp = rhead; rp; rp = rnext) {
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if (!fwrite(rp->sym, rp->symlen, 1, fp))
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error(tname);
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rnext = rp->next;
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free(rp);
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}
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rhead = NULL;
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if (pad && !fwrite(&pad, sizeof(pad), 1, fp))
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error(tname);
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(void)fflush(fp);
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}
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