DeforaOS/utils
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This commit is contained in:
Pierre Pronchery 2005-02-03 01:25:58 +00:00
parent f7e8789172
commit 509132fce6
1 changed files with 54 additions and 11 deletions
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65
src/cksum.c
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@ -2,8 +2,12 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
/* constants */
@ -65,14 +69,25 @@ static unsigned long crctab[] = {
/* cksum */
int _cksum_error(char * message, int ret);
int _cksum_do(char * filename);
int _cksum_do(FILE * fp, char * filename);
int _cksum(int argc, char * argv[])
{
int i;
int ret = 0;
FILE * fp;
if(argc == 0)
return _cksum_do(stdin, "stdin") == 0 ? 0 : 2;
for(i = 0; i < argc; i++)
ret += _cksum_do(argv[i]);
{
if((fp = fopen(argv[i], "r")) == NULL)
{
ret += _cksum_error(argv[i], 1);
continue;
}
ret += _cksum_do(fp, argv[i]);
fclose(fp);
}
return ret == 0 ? 0 : 2;
}
@ -83,18 +98,46 @@ int _cksum_error(char * message, int ret)
return ret;
}
int _cksum_do(char * filename)
static int _do_is_directory(FILE * fp);
int _cksum_do(FILE * fp, char * filename)
{
FILE * fp;
unsigned int sum;
int size;
unsigned int sum = 0;
unsigned int size = 0;
int c;
unsigned int n;
if((fp = fopen(filename, "r")) == NULL)
if(_do_is_directory(fp))
return _cksum_error(filename, 1);
/* FIXME */
printf("%u %d %s\n", sum, size, filename);
fclose(fp);
return 1;
while((c = fgetc(fp)) != EOF)
{
sum = (sum << 8) ^ crctab[(sum >> 24) ^ c];
size++;
}
for(n = size; n != 0;)
{
c = n & 0377;
n >>= 8;
sum = (sum << 8) ^ crctab[(sum >> 24) ^ c];
}
printf("%u %d %s\n", ~sum, size, filename);
return 0;
}
static int _do_is_directory(FILE * fp)
{
int fd;
struct stat st;
if((fd = fileno(fp)) == -1)
return 1;
if(fstat(fd, &st) != 0)
return 1;
if(S_ISDIR(st.st_mode))
{
errno = EISDIR;
return 1;
}
return 0;
}