diff options
| -rw-r--r-- | archival/tar.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/archival/tar.c b/archival/tar.c index ca802f73c..f10781a58 100644 --- a/archival/tar.c +++ b/archival/tar.c @@ -232,7 +232,7 @@ static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf } /* Put an octal string into the specified buffer. - * The number is zero padded and possibly null terminated. + * The number is zero padded and possibly NUL terminated. * Stores low-order bits only if whole value does not fit. */ static void putOctal(char *cp, int len, off_t value) { @@ -283,31 +283,32 @@ static void chksum_and_xwrite(int fd, struct tar_header_t* hp) # if ENABLE_FEATURE_TAR_GNU_EXTENSIONS static void writeLongname(int fd, int type, const char *name, int dir) { - static const struct { + struct prefilled { char mode[8]; /* 100-107 */ char uid[8]; /* 108-115 */ char gid[8]; /* 116-123 */ char size[12]; /* 124-135 */ char mtime[12]; /* 136-147 */ - } prefilled = { - "0000000", - "0000000", - "0000000", - "00000000000", - "00000000000", }; struct tar_header_t header; int size; + memset(&header, 0, sizeof(header)); + header.typeflag = type; + strcpy(header.name, "././@LongLink"); + /* This sets mode/uid/gid/mtime to "00...00<NUL>" strings */ + memset(header.mode, '0', sizeof(struct prefilled)); + header.mode [sizeof(header.mode ) - 1] = '\0'; + header.uid [sizeof(header.uid ) - 1] = '\0'; + header.gid [sizeof(header.gid ) - 1] = '\0'; + /* header.size is filled by '0' now, will be corrected below */ + header.mtime[sizeof(header.mtime) - 1] = '\0'; + dir = !!dir; /* normalize: 0/1 */ size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */ /* + dir: account for possible '/' */ - memset(&header, 0, sizeof(header)); - strcpy(header.name, "././@LongLink"); - memcpy(header.mode, prefilled.mode, sizeof(prefilled)); PUT_OCTAL(header.size, size); - header.typeflag = type; chksum_and_xwrite(fd, &header); /* Write filename[/] and pad the block. */ |