the position of new files depends on the [-abi] flags

[unix-history] / usr / src / usr.bin / ar / replace.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.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)replace.c   5.2 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <ar.h>
#include <stdio.h>
#include "archive.h"

extern CHDR chdr;                       /* converted header */
extern char *archive;                   /* archive name */
extern char *tname;                     /* temporary file "name" */

/*
* replace --
*      Replace or add named members to archive.  Entries already in the
*      archive are swapped in place.  Others are added before or after 
*      the key entry, based on the a, b and i options.  If the u option
*      is specified, modification dates select for replacement.
*/
replace(argv)
       char **argv;
{
       extern char *posname;           /* positioning file name */
       register char *file;
       register int afd, curfd, mods, sfd;
       struct stat sb;
       CF cf;
       off_t size, tsize;
       int err, exists, tfd1, tfd2;
       char *rname();

       /*
        * If doesn't exist, simply append to the archive.  There's
        * a race here, but it's pretty short, and not worth fixing.
        */
       exists = !stat(archive, &sb);
       afd = open_archive(O_CREAT|O_RDWR);

       if (!exists) {
               tfd1 = -1;
               tfd2 = tmp();
               goto append;
       } 

       tfd1 = tmp();                   /* Files before key file. */
       tfd2 = tmp();                   /* Files after key file. */

       /*
        * Break archive into two parts -- entries before and after the key
        * entry.  If positioning before the key, place the key at the
        * beginning of the after key entries and if positioning after the
        * key, place the key at the end of the before key entries.  Put it
        * all back together at the end.
        */
       mods = (options & (AR_A|AR_B));
       for (err = 0, curfd = tfd1; get_header(afd);) {
               if ((file = *argv) && files(argv)) {
                       if ((sfd = open(file, O_RDONLY)) < 0) {
                               err = 1;
                               (void)fprintf(stderr, "ar: %s: %s.\n",
                                   file, strerror(errno));
                               goto useold;
                       }
                       (void)fstat(sfd, &sb);
                       if (options & AR_U && sb.st_mtime <= chdr.date)
                               goto useold;

                       if (options & AR_V)
                            (void)printf("r - %s\n", chdr.name);

                       SETCF(sfd, file, curfd, tname, WPAD);
                       put_header(&cf, &sb);
                       copyfile(&cf, sb.st_size);
                       (void)close(sfd);
                       SKIP(afd, chdr.size, archive);
                       continue;
               }

               if (mods && compare(posname)) {
                       mods = 0;
                       if (options & AR_B)
                               curfd = tfd2;
                       SETCF(afd, archive, curfd, tname, RPAD|WPAD);
                       put_header(&cf, (struct stat *)NULL);
                       copyfile(&cf, chdr.size);
                       if (options & AR_A)
                               curfd = tfd2;
               } else {
useold:                 SETCF(afd, archive, curfd, tname, RPAD|WPAD);
                       put_header(&cf, (struct stat *)NULL);
                       copyfile(&cf, chdr.size);
               }
       }

       if (mods) {
               (void)fprintf(stderr, "ar: %s: archive member not found.\n",
                   posname);
               close_archive(afd);
               return(1);
       }

       /* Append any left-over arguments to the end of the after file. */
append: while (file = *argv++) {
               if (options & AR_V)
                       (void)printf("a - %s\n", rname(file));
               if ((sfd = open(file, O_RDONLY)) < 0) {
                       err = 1;
                       (void)fprintf(stderr, "ar: %s: %s.\n",
                           file, strerror(errno));
                       continue;
               }
               (void)fstat(sfd, &sb);
               SETCF(sfd, file,
                   options & (AR_A|AR_B) ? tfd1 : tfd2, tname, WPAD);
               put_header(&cf, &sb);
               copyfile(&cf, sb.st_size);
               (void)close(sfd);
       }
       
       (void)lseek(afd, (off_t)SARMAG, SEEK_SET);

       SETCF(tfd1, tname, afd, archive, RPAD|WPAD);
       if (tfd1 != -1) {
               tsize = size = lseek(tfd1, (off_t)0, SEEK_CUR);
               (void)lseek(tfd1, (off_t)0, SEEK_SET);
               copyfile(&cf, size);
       } else
               tsize = 0;

       tsize += size = lseek(tfd2, (off_t)0, SEEK_CUR);
       (void)lseek(tfd2, (off_t)0, SEEK_SET);
       cf.rfd = tfd2;
       copyfile(&cf, size);

       (void)ftruncate(afd, tsize + SARMAG);
       close_archive(afd);
       return(err);
}