OpenBSD-4.6/usr.bin/ranlib/build.c
/* $OpenBSD: build.c,v 1.12 2004/10/09 20:36:05 mickey Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Hugh Smith at The University of Guelph.
*
* 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. 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
/*static char sccsid[] = "from: @(#)build.c 5.3 (Berkeley) 3/12/91";*/
static char rcsid[] = "$OpenBSD: build.c,v 1.12 2004/10/09 20:36:05 mickey Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <a.out.h>
#include <dirent.h>
#include <unistd.h>
#include <ar.h>
#include <limits.h>
#include <ranlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <archive.h>
#include <err.h>
#include "byte.c"
#include "extern.h"
extern CHDR chdr; /* converted header */
typedef struct _rlib {
struct _rlib *next; /* next structure */
off_t pos; /* offset of defining archive file */
char *sym; /* symbol */
int symlen; /* strlen(sym) */
} RLIB;
RLIB *rhead, **pnext;
static FILE *fp;
static long symcnt; /* symbol count */
static long tsymlen; /* total string length */
static int rexec();
static void symobj();
int
build(void)
{
CF cf;
int afd, tfd;
int current_mid;
off_t size;
current_mid = -1;
afd = open_archive(O_RDWR);
fp = fdopen(afd, "r+");
tfd = tmp();
SETCF(afd, archive, tfd, tname, RPAD|WPAD);
/* Read through the archive, creating list of symbols. */
symcnt = tsymlen = 0;
pnext = &rhead;
while(get_arobj(afd)) {
int new_mid;
if (!strcmp(chdr.name, RANLIBMAG)) {
skip_arobj(afd);
continue;
}
new_mid = rexec(afd, tfd);
if (new_mid != -1) {
if (current_mid == -1)
current_mid = new_mid;
else if (new_mid != current_mid)
errx(1, "Mixed object format archive: %d / %d",
new_mid, current_mid);
}
put_arobj(&cf, (struct stat *)NULL);
}
*pnext = NULL;
/* Create the symbol table. Endianess the same as last mid seen */
symobj(current_mid);
/* Copy the saved objects into the archive. */
size = lseek(tfd, (off_t)0, SEEK_CUR);
(void)lseek(tfd, (off_t)0, SEEK_SET);
SETCF(tfd, tname, afd, archive, NOPAD);
copy_ar(&cf, size);
(void)ftruncate(afd, lseek(afd, (off_t)0, SEEK_CUR));
(void)close(tfd);
/* Set the time. */
settime(afd);
close_archive(afd);
return(0);
}
/*
* rexec
* Read the exec structure; ignore any files that don't look
* exactly right. Return MID.
* return -1 for files that don't look right.
* XXX it's hard to be sure when to ignore files, and when to error
* out.
*/
static int
rexec(int rfd, int wfd)
{
RLIB *rp;
long nsyms;
int nr, symlen;
char *strtab = 0;
char *sym;
struct exec ebuf;
struct nlist nl;
off_t r_off, w_off;
long strsize;
int result = -1;
/* Get current offsets for original and tmp files. */
r_off = lseek(rfd, (off_t)0, SEEK_CUR);
w_off = lseek(wfd, (off_t)0, SEEK_CUR);
/* Read in exec structure. */
nr = read(rfd, (char *)&ebuf, sizeof(struct exec));
if (nr != sizeof(struct exec))
goto bad;
/* Check magic number and symbol count. */
if (BAD_OBJECT(ebuf) || ebuf.a_syms == 0)
goto bad;
fix_header_order(&ebuf);
/* Seek to string table. */
if (lseek(rfd, N_STROFF(ebuf) + r_off, SEEK_SET) == (off_t)-1) {
if (errno == EINVAL)
goto bad;
else
error(archive);
}
/* Read in size of the string table. */
nr = read(rfd, (char *)&strsize, sizeof(strsize));
if (nr != sizeof(strsize))
goto bad;
strsize = fix_32_order(strsize, N_GETMID(ebuf));
/* Read in the string table. */
strsize -= sizeof(strsize);
strtab = (char *)emalloc(strsize);
nr = read(rfd, strtab, strsize);
if (nr != strsize)
goto bad;
/* Seek to symbol table. */
if (fseek(fp, N_SYMOFF(ebuf) + r_off, SEEK_SET) == (off_t)-1)
goto bad;
result = N_GETMID(ebuf);
/* For each symbol read the nlist entry and save it as necessary. */
nsyms = ebuf.a_syms / sizeof(struct nlist);
while (nsyms--) {
if (!fread((char *)&nl, sizeof(struct nlist), 1, fp)) {
if (feof(fp))
badfmt();
error(archive);
}
fix_nlist_order(&nl, N_GETMID(ebuf));
/* Ignore if no name or local. */
if (!nl.n_un.n_strx || !(nl.n_type & N_EXT))
continue;
/*
* If the symbol is an undefined external and the n_value
* field is non-zero, keep it.
*/
if ((nl.n_type & N_TYPE) == N_UNDF && !nl.n_value)
continue;
/* First four bytes are the table size. */
sym = strtab + nl.n_un.n_strx - sizeof(long);
symlen = strlen(sym) + 1;
rp = (RLIB *)emalloc(sizeof(RLIB));
rp->sym = (char *)emalloc(symlen);
bcopy(sym, rp->sym, symlen);
rp->symlen = symlen;
rp->pos = w_off;
/* Build in forward order for "ar -m" command. */
*pnext = rp;
pnext = &rp->next;
++symcnt;
tsymlen += symlen;
}
bad: if (nr < 0)
error(archive);
free(strtab);
(void)lseek(rfd, (off_t)r_off, SEEK_SET);
return result;
}
/*
* symobj --
* Write the symbol table into the archive, computing offsets as
* writing. Use the right format depending on mid.
*/
static void
symobj(int mid)
{
RLIB *rp, *rnext;
struct ranlib rn;
char hb[sizeof(struct ar_hdr) + 1], pad;
long ransize, size, stroff;
uid_t uid;
gid_t gid;
/* Rewind the archive, leaving the magic number. */
if (fseek(fp, (off_t)SARMAG, SEEK_SET) == (off_t)-1)
error(archive);
/* Size of the ranlib archive file, pad if necessary. */
ransize = sizeof(long) +
symcnt * sizeof(struct ranlib) + sizeof(long) + tsymlen;
if (ransize & 01) {
++ransize;
pad = '\n';
} else
pad = '\0';
uid = getuid();
if (uid > USHRT_MAX) {
warnx("warning: uid %u truncated to %u", uid, USHRT_MAX);
uid = USHRT_MAX;
}
gid = getgid();
if (gid > USHRT_MAX) {
warnx("warning: gid %u truncated to %u", gid, USHRT_MAX);
gid = USHRT_MAX;
}
/* Put out the ranlib archive file header. */
#define DEFMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
(void)snprintf(hb, sizeof hb, HDR2, RANLIBMAG, 0L, uid, gid,
DEFMODE & ~umask(0), (off_t)ransize, ARFMAG);
if (!fwrite(hb, sizeof(struct ar_hdr), 1, fp))
error(tname);
/* First long is the size of the ranlib structure section. */
size = fix_32_order(symcnt * sizeof(struct ranlib), mid);
if (!fwrite((char *)&size, sizeof(size), 1, fp))
error(tname);
/* Offset of the first archive file. */
size = SARMAG + sizeof(struct ar_hdr) + ransize;
/*
* Write out the ranlib structures. The offset into the string
* table is cumulative, the offset into the archive is the value
* set in rexec() plus the offset to the first archive file.
*/
for (rp = rhead, stroff = 0; rp; rp = rp->next) {
rn.ran_un.ran_strx = stroff;
stroff += rp->symlen;
rn.ran_off = size + rp->pos;
fix_ranlib_order(&rn, mid);
if (!fwrite((char *)&rn, sizeof(struct ranlib), 1, fp))
error(archive);
}
/* Second long is the size of the string table. */
size = fix_32_order(tsymlen, mid);
if (!fwrite((char *)&size, sizeof(size), 1, fp))
error(tname);
/* Write out the string table. */
for (rp = rhead; rp; rp = rnext) {
if (!fwrite(rp->sym, rp->symlen, 1, fp))
error(tname);
rnext = rp->next;
free(rp);
}
rhead = NULL;
if (pad && !fwrite(&pad, sizeof(pad), 1, fp))
error(tname);
(void)fflush(fp);
}