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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdint.h>
#include "zen.h"
#include "debug.h"
long
strtol(nptr, endptr, base)
const char *nptr;
char **endptr;
register int base;
{
register const char *s = nptr;
register unsigned long acc;
register int c;
register unsigned long cutoff;
register int neg = 0, any, cutlim;
/*
* Skip white space and pick up leading +/- sign if any.
* If base is 0, allow 0x for hex and 0 for octal, else
* assume decimal; if base is already 16, allow 0x.
*/
do {
c = *s++;
} while (isspace(c));
if (c == '-') {
neg = 1;
c = *s++;
} else if (c == '+')
c = *s++;
if ((base == 0 || base == 16) &&
c == '0' && (*s == 'x' || *s == 'X')) {
c = s[1];
s += 2;
base = 16;
} else if ((base == 0 || base == 2) &&
c == '0' && (*s == 'b' || *s == 'B')) {
c = s[1];
s += 2;
base = 2;
}
if (base == 0)
base = c == '0' ? 8 : 10;
/*
* Compute the cutoff value between legal numbers and illegal
* numbers. That is the largest legal value, divided by the
* base. An input number that is greater than this value, if
* followed by a legal input character, is too big. One that
* is equal to this value may be valid or not; the limit
* between valid and invalid numbers is then based on the last
* digit. For instance, if the range for longs is
* [-2147483648..2147483647] and the input base is 10,
* cutoff will be set to 214748364 and cutlim to either
* 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
* a value > 214748364, or equal but the next digit is > 7 (or 8),
* the number is too big, and we will return a range error.
*
* Set any if any `digits' consumed; make it negative to indicate
* overflow.
*/
cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
cutlim = cutoff % (unsigned long)base;
cutoff /= (unsigned long)base;
for (acc = 0, any = 0;; c = *s++) {
if (isdigit(c))
c -= '0';
else if (isalpha(c))
c -= isupper(c) ? 'A' - 10 : 'a' - 10;
else
break;
if (c >= base)
break;
if (any < 0 || acc > cutoff || acc == cutoff && c > cutlim)
any = -1;
else {
any = 1;
acc *= base;
acc += c;
}
}
if (any < 0) {
acc = neg ? LONG_MIN : LONG_MAX;
// errno = ERANGE;
} else if (neg)
acc = -acc;
if (endptr != 0)
*endptr = (char *)(any ? s - 1 : nptr);
return (acc);
}
int main()
{
int run=1;
int const max_sz=1024;
char cmd[max_sz];
int sz;
int fd_in=-1;
W( run )
{
write( 1, ">", 1 );
sz = read( 2, cmd, max_sz-1 );
cmd[sz]=0;
printf("%s",cmd);
S( cmd[0] )
{
//>f [MODE] [fname]
case 'f':
{
//check if size is more then needed
//>"f t" is min?
//add modes?
I(sz<3)B;
cmd[sz-1]=0;
fd_in = open(&cmd[2],O_WRONLY|O_CREAT,S_IRUSR);
PRINT("%s",&cmd[2]);
}
break;
case 'a':
{
}
break;
//close >c
case 'c':
{
PNL();
I(fd_in!=-1)
{
close( fd_in );
fd_in=-1;
}
}
break;
//file position >p [NUMBER]
case 'p':
{
I(fd_in==-1)B;
off_t p=lseek(fd_in,strtol(&cmd[2],NULL,10),SEEK_SET);
printf("Position: %d",p);
}
break;
//put bytes into file at current position >e 0x00 0xaa 0x11
case 'e':
{
char *iter;
int i=0;
uint8_t num;
I(fd_in==-1)B;
I(sz<6)B;
i = 2;
iter = &cmd[i];
while ( i<sz )
{
num = (uint8_t)strtol( iter, NULL, 16 );
write( fd_in, &num, 1 );
i += 5;
iter = &cmd[i];
}
}
break;
// dump hex >v [SIZE] how much bytes to see
case 'v':
{
I(fd_in==-1)B;
I(sz<3)B;
int i;
int dumpsz=strtol(&cmd[2],NULL,10);
uint8_t val;
for (i=0;i<dumpsz;i++)
{
read( fd_in, &val, 1);
printf("%02x ", val);
}
write(1,"\n",1);
}
break;
case 'h':
{
char s[]="Help:\n\
f [FILE] - create file with name FILE\n\
p [POSITION] - set postion in file\n\
q - exit\n\
e [0x00] ... - write value with hex fow \n\
c - close file \n";
write(1,s,strlen(s) );
}
break;
case 'q':
write(1,"exiting ...\n",strlen("exiting ...\n"));
run = 0;
break;
default:
{};
}
}
return 0;
}
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