1 /*- 2 * Copyright (c) 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Hugh Smith at The University of Guelph. 7 * 8 * %sccs.include.redist.c% 9 */ 10 11 #ifndef lint 12 static char sccsid[] = "@(#)replace.c 8.3 (Berkeley) 04/02/94"; 13 #endif /* not lint */ 14 15 #include <sys/param.h> 16 #include <sys/stat.h> 17 18 #include <ar.h> 19 #include <dirent.h> 20 #include <err.h> 21 #include <fcntl.h> 22 #include <stdio.h> 23 #include <string.h> 24 #include <unistd.h> 25 26 #include "archive.h" 27 #include "extern.h" 28 29 /* 30 * replace -- 31 * Replace or add named members to archive. Entries already in the 32 * archive are swapped in place. Others are added before or after 33 * the key entry, based on the a, b and i options. If the u option 34 * is specified, modification dates select for replacement. 35 */ 36 int 37 replace(argv) 38 char **argv; 39 { 40 char *file; 41 int afd, curfd, errflg, exists, mods, sfd, tfd1, tfd2; 42 struct stat sb; 43 CF cf; 44 off_t size, tsize; 45 46 errflg = 0; 47 /* 48 * If doesn't exist, simply append to the archive. There's 49 * a race here, but it's pretty short, and not worth fixing. 50 */ 51 exists = !stat(archive, &sb); 52 afd = open_archive(O_CREAT|O_RDWR); 53 54 if (!exists) { 55 tfd1 = -1; 56 tfd2 = tmp(); 57 goto append; 58 } 59 60 tfd1 = tmp(); /* Files before key file. */ 61 tfd2 = tmp(); /* Files after key file. */ 62 63 /* 64 * Break archive into two parts -- entries before and after the key 65 * entry. If positioning before the key, place the key at the 66 * beginning of the after key entries and if positioning after the 67 * key, place the key at the end of the before key entries. Put it 68 * all back together at the end. 69 */ 70 mods = (options & (AR_A|AR_B)); 71 for (curfd = tfd1; get_arobj(afd);) { 72 if (*argv && (file = files(argv))) { 73 if ((sfd = open(file, O_RDONLY)) < 0) { 74 errflg = 1; 75 warn("%s", file); 76 goto useold; 77 } 78 (void)fstat(sfd, &sb); 79 if (options & AR_U && sb.st_mtime <= chdr.date) 80 goto useold; 81 82 if (options & AR_V) 83 (void)printf("r - %s\n", file); 84 85 /* Read from disk, write to an archive; pad on write */ 86 SETCF(sfd, file, curfd, tname, WPAD); 87 put_arobj(&cf, &sb); 88 (void)close(sfd); 89 skip_arobj(afd); 90 continue; 91 } 92 93 if (mods && compare(posname)) { 94 mods = 0; 95 if (options & AR_B) 96 curfd = tfd2; 97 /* Read and write to an archive; pad on both. */ 98 SETCF(afd, archive, curfd, tname, RPAD|WPAD); 99 put_arobj(&cf, (struct stat *)NULL); 100 if (options & AR_A) 101 curfd = tfd2; 102 } else { 103 /* Read and write to an archive; pad on both. */ 104 useold: SETCF(afd, archive, curfd, tname, RPAD|WPAD); 105 put_arobj(&cf, (struct stat *)NULL); 106 } 107 } 108 109 if (mods) { 110 warnx("%s: archive member not found", posarg); 111 close_archive(afd); 112 return (1); 113 } 114 115 /* Append any left-over arguments to the end of the after file. */ 116 append: while (file = *argv++) { 117 if (options & AR_V) 118 (void)printf("a - %s\n", file); 119 if ((sfd = open(file, O_RDONLY)) < 0) { 120 errflg = 1; 121 warn("%s", file); 122 continue; 123 } 124 (void)fstat(sfd, &sb); 125 /* Read from disk, write to an archive; pad on write. */ 126 SETCF(sfd, file, 127 options & (AR_A|AR_B) ? tfd1 : tfd2, tname, WPAD); 128 put_arobj(&cf, &sb); 129 (void)close(sfd); 130 } 131 132 (void)lseek(afd, (off_t)SARMAG, SEEK_SET); 133 134 SETCF(tfd1, tname, afd, archive, NOPAD); 135 if (tfd1 != -1) { 136 tsize = size = lseek(tfd1, (off_t)0, SEEK_CUR); 137 (void)lseek(tfd1, (off_t)0, SEEK_SET); 138 copy_ar(&cf, size); 139 } else 140 tsize = 0; 141 142 tsize += size = lseek(tfd2, (off_t)0, SEEK_CUR); 143 (void)lseek(tfd2, (off_t)0, SEEK_SET); 144 cf.rfd = tfd2; 145 copy_ar(&cf, size); 146 147 (void)ftruncate(afd, tsize + SARMAG); 148 close_archive(afd); 149 return (errflg); 150 } 151