2.11BSD/src/usr.bin/ranlib/build.c
/*-
* 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. 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.
*/
#if !defined(lint) && defined(DOSCCS)
static char sccsid[] = "@(#)build.c 5.3.1 (Berkeley) 5/17/93";
#endif
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <a.out.h>
#include <sys/dir.h>
#include <sys/file.h>
#include <ar.h>
#include <ranlib.h>
#include <stdio.h>
#include <archive.h>
extern off_t lseek();
extern CHDR chdr; /* converted header */
extern char *archive; /* archive name */
extern char *tname; /* temporary file "name" */
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;
FILE *fp;
static void rexec(), symobj();
void error(), badfmt();
long symcnt; /* symbol count */
long tsymlen; /* total string length */
build()
{
CF cf;
int afd, tfd;
off_t size;
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. */
pnext = &rhead;
symcnt = tsymlen = 0;
while(get_arobj(afd)) {
if (!strcmp(chdr.name, RANLIBMAG)) {
skip_arobj(afd);
continue;
}
rexec(afd, tfd);
put_arobj(&cf, (struct stat *)NULL);
}
*pnext = NULL;
/* Create the symbol table. */
symobj();
/* Copy the saved objects into the archive. */
size = lseek(tfd, (off_t)0, L_INCR);
(void)lseek(tfd, (off_t)0, L_SET);
SETCF(tfd, tname, afd, archive, RPAD|WPAD);
copy_ar(&cf, size);
(void)ftruncate(afd, lseek(afd, (off_t)0, L_INCR));
(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.
*/
static void
rexec(rfd, wfd)
int rfd;
int wfd;
{
register RLIB *rp;
RLIB **savnext;
long nsyms;
register int nr, symlen;
char sym[512]; /* XXX - more than enough (we hope) */
struct exec ebuf;
struct nlist nl;
off_t r_off, w_off, sympos;
void *emalloc();
/* Get current offsets for original and tmp files. */
r_off = lseek(rfd, (off_t)0, L_INCR);
w_off = lseek(wfd, (off_t)0, L_INCR);
/* Read in exec structure. */
nr = read(rfd, (char *)&ebuf, sizeof(struct exec));
if (nr != sizeof(struct exec))
goto bad1;
/* Check magic number and symbol count. */
if (N_BADMAG(ebuf) || ebuf.a_syms == 0)
goto bad1;
/* First four bytes are the table size. */
sympos = N_STROFF(ebuf) + r_off;
/* Seek to symbol table. */
if (fseek(fp, (off_t)N_SYMOFF(ebuf) + r_off, L_SET) == (off_t)-1)
goto bad1;
/* Save starting point in symbol chain */
savnext = pnext;
/* 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);
}
/* 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;
rp = (RLIB *)emalloc(sizeof(RLIB));
rp->pos = sympos + nl.n_un.n_strx;
rp->next = NULL;
/* Build in forward order for "ar -m" command. */
*pnext = rp;
pnext = &rp->next;
++symcnt;
}
for (rp = *savnext; rp; rp = rp->next) {
fseek(fp, rp->pos, L_SET);
symlen = sgets(sym, sizeof (sym), fp);
rp->sym = (char *)emalloc(symlen);
bcopy(sym, rp->sym, symlen);
rp->symlen = symlen;
rp->pos = w_off;
tsymlen += symlen;
}
bad1: (void)lseek(rfd, (off_t)r_off, L_SET);
}
/*
* symobj --
* Write the symbol table into the archive, computing offsets as
* writing.
*/
static void
symobj()
{
register RLIB *rp, *next;
struct ranlib rn;
char hb[sizeof(struct ar_hdr) + 1], pad;
long ransize, size, stroff;
gid_t getgid();
uid_t getuid();
/* Rewind the archive, leaving the magic number. */
if (fseek(fp, (off_t)SARMAG, L_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';
/* Put out the ranlib archive file header. */
(void)sprintf(hb, HDR2, RANLIBMAG, 0L, getuid(), getgid(),
0666 & ~umask(0), ransize, ARFMAG);
if (!fwrite(hb, sizeof(struct ar_hdr), 1, fp))
error(tname);
/* First long is the size of the ranlib structure section. */
size = symcnt * sizeof(struct ranlib);
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;
if (!fwrite((char *)&rn, sizeof(struct ranlib), 1, fp))
error(archive);
}
/* Second long is the size of the string table. */
if (!fwrite((char *)&tsymlen, sizeof(tsymlen), 1, fp))
error(tname);
/* Write out the string table. */
for (rp = rhead; rp; ) {
if (!fwrite(rp->sym, rp->symlen, 1, fp))
error(tname);
(void)free(rp->sym);
next = rp->next;
free(rp);
rp = next;
}
if (pad && !fwrite(&pad, sizeof(pad), 1, fp))
error(tname);
(void)fflush(fp);
}
sgets(buf, n, fp)
char *buf;
int n;
register FILE *fp;
{
register int i, c;
n--; /* room for null */
for (i = 0; i < n; i++)
{
c = getc(fp);
if (c == EOF || c == 0)
break;
*buf++ = c;
}
*buf = '\0';
return(i + 1);
}