date and time created 91/01/17 18:24:03 by bostic

SCCS-vsn: usr.bin/ar/replace.c 5.1

diff --git a/usr/src/usr.bin/ar/replace.c b/usr/src/usr.bin/ar/replace.c
new file mode 100644 (file)
index 0000000..4b0472f
--- /dev/null
+++ b/usr/src/usr.bin/ar/replace.c
@@ -0,0 +1,154 @@
+/*-
+ * 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  5.1 (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. */
+       
+       mods = (options & (AR_A|AR_B));
+
+       /*
+        * 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.
+        */
+       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, 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);
+}