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/*
** Copyright 1998-2003 University of Illinois Board of Trustees
** Copyright 1998-2003 Mark D. Roth
** All rights reserved.
**
** util.c - miscellaneous utility code for libtar
**
** Mark D. Roth <roth@uiuc.edu>
** Campus Information Technologies and Educational Services
** University of Illinois at Urbana-Champaign
*/
#include <internal.h>
#include <stdio.h>
#include <sys/param.h>
#include <errno.h>
#ifdef STDC_HEADERS
# include <string.h>
#endif
/* hashing function for pathnames */
int
path_hashfunc(char *key, int numbuckets)
{
char buf[MAXPATHLEN];
char *p;
strcpy(buf, key);
p = basename(buf);
return (((unsigned int)p[0]) % numbuckets);
}
/* matching function for dev_t's */
int
dev_match(dev_t *dev1, dev_t *dev2)
{
return !memcmp(dev1, dev2, sizeof(dev_t));
}
/* matching function for ino_t's */
int
ino_match(ino_t *ino1, ino_t *ino2)
{
return !memcmp(ino1, ino2, sizeof(ino_t));
}
/* hashing function for dev_t's */
int
dev_hash(dev_t *dev)
{
return *dev % 16;
}
/* hashing function for ino_t's */
int
ino_hash(ino_t *inode)
{
return *inode % 256;
}
/*
** mkdirhier() - create all directories in a given path
** returns:
** 0 success
** 1 all directories already exist
** -1 (and sets errno) error
*/
int
mkdirhier(char *path)
{
char src[MAXPATHLEN], dst[MAXPATHLEN] = "";
char *dirp, *nextp = src;
int retval = 1;
if (strlcpy(src, path, sizeof(src)) > sizeof(src))
{
errno = ENAMETOOLONG;
return -1;
}
if (path[0] == '/')
strcpy(dst, "/");
while ((dirp = strsep(&nextp, "/")) != NULL)
{
if (*dirp == '\0')
continue;
if (dst[0] != '\0')
strcat(dst, "/");
strcat(dst, dirp);
if (mkdir(dst, 0777) == -1)
{
if (errno != EEXIST)
return -1;
}
else
retval = 0;
}
return retval;
}
/* calculate header checksum */
int
th_crc_calc(TAR *t)
{
int i, sum = 0;
for (i = 0; i < T_BLOCKSIZE; i++)
sum += ((unsigned char *)(&(t->th_buf)))[i];
for (i = 0; i < 8; i++)
sum += (' ' - (unsigned char)t->th_buf.chksum[i]);
return sum;
}
/* calculate a signed header checksum */
int
th_signed_crc_calc(TAR *t)
{
int i, sum = 0;
for (i = 0; i < T_BLOCKSIZE; i++)
sum += ((signed char *)(&(t->th_buf)))[i];
for (i = 0; i < 8; i++)
sum += (' ' - (signed char)t->th_buf.chksum[i]);
return sum;
}
/* string-octal to integer conversion */
int64_t
oct_to_int(char *oct, size_t octlen)
{
long long int val;
char tmp[octlen + 1];
memcpy(tmp, oct, octlen);
tmp[octlen] = '\0';
return sscanf(oct, "%llo", &val) == 1 ? (int64_t)val : 0;
}
/* string-octal or binary to integer conversion */
int64_t oct_to_int_ex(char *oct, size_t octlen)
{
if (*(unsigned char *)oct & 0x80) {
int64_t val = 0;
char tmp[octlen];
unsigned char *p;
unsigned int i;
memcpy(tmp, oct, octlen);
*tmp &= 0x7f;
p = (unsigned char *)tmp + octlen - sizeof(val);
for (i = 0; i < sizeof(val); ++i) {
val <<= 8;
val |= *(p++);
}
return val;
}
return oct_to_int(oct, octlen);
}
/* integer to NULL-terminated string-octal conversion */
void int_to_oct(int64_t num, char *oct, size_t octlen)
{
char tmp[sizeof(num)*3 + 1];
int olen;
olen = sprintf(tmp, "%0*llo", (int)octlen, (long long)num);
memcpy(oct, tmp + olen - octlen + 1, octlen);
}
/* integer to string-octal conversion, or binary as necessary */
void
int_to_oct_ex(int64_t num, char *oct, size_t octlen)
{
if (num < 0 || num >= ((int64_t)1 << ((octlen - 1) * 3))) {
unsigned char *p;
unsigned int i;
memset(oct, 0, octlen);
p = (unsigned char *)oct + octlen;
for (i = 0; i < sizeof(num); ++i) {
*(--p) = num & 0xff;
num >>= 8;
}
if (num < 0) {
for (; i < octlen; ++i) {
*(--p) = 0xff;
}
}
*(unsigned char *)oct |= 0x80;
return;
}
int_to_oct(num, oct, octlen);
}
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