usr/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.
 */

#ifndef lint
static char sccsid[] = "@(#)build.c     5.3 (Berkeley) 3/12/91";
#endif /* not lint */

#include <sys/types.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <a.out.h>
#include <dirent.h>
#include <unistd.h>
#include <ar.h>
#include <ranlib.h>
#include <stdio.h>
#include <archive.h>

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();

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;
        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, SEEK_CUR);
        (void)lseek(tfd, (off_t)0, SEEK_SET);
        SETCF(tfd, tname, afd, archive, RPAD|WPAD);
        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);
}

long symcnt;                            /* symbol count */
long tsymlen;                           /* total string length */

/*
 * rexec
 *      Read the exec structure; ignore any files that don't look
 *      exactly right.
 */
static void
rexec(rfd, wfd)
        register int rfd;
        int wfd;
{
        register RLIB *rp;
        register long nsyms;
        register int nr, symlen;
        register char *strtab, *sym;
        struct exec ebuf;
        struct nlist nl;
        off_t r_off, w_off;
        long strsize;
        void *emalloc();

        /* 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 badread;

        /* Check magic number and symbol count. */
        if (N_BADMAG(ebuf) || ebuf.a_syms == 0)
                goto bad1;

        /* Seek to string table. */
        if (lseek(rfd, N_STROFF(ebuf) + r_off, SEEK_SET) == (off_t)-1)
                error(archive);

        /* Read in size of the string table. */
        nr = read(rfd, (char *)&strsize, sizeof(strsize));
        if (nr != sizeof(strsize))
                goto badread;

        /* Read in the string table. */
        strsize -= sizeof(strsize);
        strtab = (char *)emalloc(strsize);
        nr = read(rfd, strtab, strsize);
        if (nr != strsize) {
badread:        if (nr < 0)
                        error(archive);
                goto bad2;
        }

        /* Seek to symbol table. */
        if (fseek(fp, N_SYMOFF(ebuf) + r_off, SEEK_SET) == (off_t)-1)
                goto bad2;

        /* 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;

                /* 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;
        }

bad2:   free(strtab);
bad1:   (void)lseek(rfd, (off_t)r_off, SEEK_SET);
}

/*
 * symobj --
 *      Write the symbol table into the archive, computing offsets as
 *      writing.
 */
static void
symobj()
{
        register RLIB *rp;
        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, 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';

        /* Put out the ranlib archive file header. */
#define DEFMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
        (void)sprintf(hb, HDR2, RANLIBMAG, 0L, getuid(), getgid(),
            DEFMODE & ~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; rp = rp->next)
                if (!fwrite(rp->sym, rp->symlen, 1, fp))
                        error(tname);

        if (pad && !fwrite(&pad, sizeof(pad), 1, fp))
                error(tname);

        (void)fflush(fp);
}