1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * 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[] = "@(#)header.c 5.1 (Berkeley) 01/17/91"; 13 #endif /* not lint */ 14 15 #include <sys/param.h> 16 #include <sys/errno.h> 17 #include <sys/stat.h> 18 #include <dirent.h> 19 #include <stdio.h> 20 #include <ar.h> 21 #include "archive.h" 22 23 typedef struct ar_hdr HDR; 24 extern CHDR chdr; /* converted header */ 25 static char hb[sizeof(HDR) + 1]; /* real header */ 26 extern char *archive; /* archive name */ 27 28 /* Convert ar header field to an integer. */ 29 #define AR_ATOI(from, to, len, base) { \ 30 bcopy(from, buf, len); \ 31 buf[len] = '\0'; \ 32 to = strtol(buf, (char **)NULL, base); \ 33 } 34 35 /* 36 * get_header -- 37 * read the archive header for this member 38 */ 39 get_header(fd) 40 int fd; 41 { 42 struct ar_hdr *hdr; 43 register int len, nr; 44 register char *p, buf[20]; 45 46 nr = read(fd, hb, sizeof(HDR)); 47 if (nr != sizeof(HDR)) { 48 if (!nr) 49 return(0); 50 if (nr < 0) 51 error(archive); 52 badfmt(); 53 } 54 55 hdr = (struct ar_hdr *)hb; 56 if (strncmp(hdr->ar_fmag, ARFMAG, sizeof(ARFMAG) - 1)) 57 badfmt(); 58 59 /* Convert the header into the internal format. */ 60 #define DECIMAL 10 61 #define OCTAL 8 62 63 AR_ATOI(hdr->ar_date, chdr.date, sizeof(hdr->ar_date), DECIMAL); 64 AR_ATOI(hdr->ar_uid, chdr.uid, sizeof(hdr->ar_uid), DECIMAL); 65 AR_ATOI(hdr->ar_gid, chdr.gid, sizeof(hdr->ar_gid), DECIMAL); 66 AR_ATOI(hdr->ar_mode, chdr.mode, sizeof(hdr->ar_mode), OCTAL); 67 AR_ATOI(hdr->ar_size, chdr.size, sizeof(hdr->ar_size), DECIMAL); 68 69 /* Leading spaces should never happen. */ 70 if (hdr->ar_name[0] == ' ') 71 badfmt(); 72 73 /* 74 * Long name support. Set the "real" size of the file, and the 75 * long name flag/size. 76 */ 77 if (!bcmp(hdr->ar_name, AR_EFMT1, sizeof(AR_EFMT1) - 1)) { 78 len = atoi(hdr->ar_name + sizeof(AR_EFMT1) - 1); 79 if (len <= 0 || len > MAXNAMLEN) 80 badfmt(); 81 nr = read(fd, chdr.name, len); 82 if (nr != len) { 83 if (nr < 0) 84 error(archive); 85 badfmt(); 86 } 87 chdr.size -= (chdr.lname = len); 88 } else { 89 bcopy(hdr->ar_name, chdr.name, sizeof(hdr->ar_name)); 90 91 /* Only strip off trailing spaces. */ 92 for (p = chdr.name + sizeof(hdr->ar_name) - 1; *p == ' '; --p); 93 *++p = '\0'; 94 chdr.lname = 0; 95 } 96 return(1); 97 } 98 99 /* 100 * put_header -- 101 * Write the archive member header to a file. 102 */ 103 put_header(cfp, sb) 104 CF *cfp; 105 struct stat *sb; 106 { 107 register int lname; 108 register char *name; 109 struct ar_hdr *hdr; 110 char *rname(); 111 112 /* 113 * If passed an sb structure, reading a file from disk. Get stat(2) 114 * information, build a name and construct a header. (Files are named 115 * by their last component in the archive.) If not, then just write 116 * the last header read. 117 */ 118 if (sb) { 119 name = rname(cfp->rname); 120 (void)fstat(cfp->rfd, sb); 121 122 if ((lname = strlen(name)) > sizeof(hdr->ar_name) || 123 index(name, ' ')) { 124 (void)sprintf(hb, HDR1, AR_EFMT1, lname, sb->st_mtime, 125 sb->st_uid, sb->st_gid, sb->st_mode, 126 sb->st_size + lname, ARFMAG); 127 } else { 128 lname = 0; 129 (void)sprintf(hb, HDR2, name, sb->st_mtime, sb->st_uid, 130 sb->st_gid, sb->st_mode, sb->st_size, ARFMAG); 131 } 132 } else { 133 lname = chdr.lname; 134 name = chdr.name; 135 } 136 137 if (write(cfp->wfd, hb, sizeof(HDR)) != sizeof(HDR) || 138 lname && write(cfp->wfd, name, lname) != lname) 139 error(cfp->wname); 140 } 141