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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>
#include <stdlib.h>
#ifdef STDC_HEADERS
# include <string.h>
#endif
/* hashing function for pathnames */
int
path_hashfunc(char *key, int numbuckets)
{
char *buf;
char *p;
int i;
buf = strdup(key);
p = basename(buf);
i = ((unsigned int)p[0]) % numbuckets;
free(buf);
return (i);
}
/* 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, *dst = NULL;
char *dirp, *nextp = NULL;
int retval = 1, len;
len = strlen(path);
if ((src = strdup(path)) == NULL)
{
errno = ENOMEM;
return -1;
}
nextp = src;
/* Make room for // with absolute paths */
if ((dst = malloc(len + 2)) == NULL)
{
free(src);
errno = ENOMEM;
return -1;
}
dst[0] = '\0';
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)
{
free(src);
free(dst);
return -1;
}
}
else
retval = 0;
}
free(src);
free(dst);
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 */
int
oct_to_int(char *oct)
{
int i;
sscanf(oct, "%o", &i);
return i;
}
/* integer to string-octal conversion, no NULL */
void
int_to_oct_nonull(int num, char *oct, size_t octlen)
{
snprintf(oct, octlen, "%*lo", octlen - 1, (unsigned long)num);
oct[octlen - 1] = ' ';
}
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