ckclib.c

C-Kermit源码。是使用串口/Modem和网络通讯的程序

	}
	if ((maxsiz > -1L) && (z <= maxsiz)) {
	    debug(F111,"fileselect maxsiz skipping",f,maxsiz);
	    /* tlog(F110,"Skipping (too small)",f,0); */
	    return(0);
	}
    }
    if (nbu) {				/* Skipping backup files? */
	if (ckmatch(
#ifdef CKREGEX
		    "*.~[0-9]*~"	/* Not perfect but close enough. */
#else
		    "*.~*~"		/* Less close. */
#endif /* CKREGEX */
		    ,f,filecase,2+1)) {
	    debug(F110,"fileselect skipping backup",f,0);
	    return(0);
	}
    }
    for (n = 0; xlist && n < nxlist; n++) {
	if (!xlist[n]) {
	    debug(F101,"fileselect xlist empty",0,n);
	    break;
	}
	if (ckmatch(xlist[n],f,filecase,2+1)) {
	    debug(F111,"fileselect xlist",xlist[n],n);
	    debug(F110,"fileselect skipping",f,0);
	    return(0);
	}
    }
    debug(F110,"fileselect selecting",f,0);
    return(1);
}

/* C K R A D I X  --  Radix converter */
/*
   Call with:
     s:   a number in string format.
     in:  int, specifying the radix of s, 2-36.
     out: int, specifying the radix to convert to, 2-36.
   Returns:
     NULL on error (illegal radix, illegal number, etc.).
     "-1" on overflow (number too big for unsigned long).
     Otherwise: Pointer to result.
*/
#define RXRESULT 127
static char rxdigits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
static char rxresult[RXRESULT+1];

char *
ckradix(s,in,out) char * s; int in, out; {
    char c, *r = rxresult;
    int d, minus = 0;
    unsigned long zz = 0L;
    long z;
    if (in < 2 || in > 36)		/* Verify legal input radix */
      return(NULL);
    if (out < 2 || out > 36)		/* and output radix. */
      return(NULL);
    if (*s == '+') {			/* Get sign if any */
	s++;
    } else if (*s == '-') {
	minus++;
	s++;
    }
    while (*s == SP || *s == '0')	/* Trim leading blanks or 0's */
      s++;
/*
  For detecting overflow, we use a signed copy of the unsigned long
  accumulator.  If it goes negative, we know we'll overflow NEXT time
  through the loop.
*/
    for (; *s;  s++) {			/* Convert from input radix to */
	c = *s;				/* unsigned long */
	if (islower(c)) c = toupper(c);
	if (c >= '0' && c <= '9')
	  d = c - '0';
	else if (c >= 'A' && c <= 'Z')
	  d = c - 'A' + 10;
	else
	  return(NULL);
	zz = zz * in + d;
	if (z < 0L)			/* Clever(?) overflow detector */
	  return("-1");
        z = zz;
    }
    if (!zz) return("0");
    r = &rxresult[RXRESULT];		/* Convert from unsigned long */
    *r-- = NUL;				/* to output radix. */
    while (zz > 0 && r > rxresult) {
	d = zz % out;
	*r-- = rxdigits[d];
	zz = zz / out;
    }
    if (minus) *r-- = '-';		/* Replace original sign */
    return((char *)(r+1));
}

#ifndef NOB64
/* Base-64 conversion routines */

static char b64[] = {			/* Encoding vector */
#ifdef pdp11
  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
#else
  'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S',
  'T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l',
  'm','n','o','p','q','r','s','t','u','v','w','x','y','z','0','1','2','3','4',
  '5','6','7','8','9','+','/','=','\0'
#endif /* pdp11 */
};
static int b64tbl[] = {			/* Decoding vector */
    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
    -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -2, -1, -1,
    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};

/*
   B 8 T O B 6 4  --  Converts 8-bit data to Base64 encoding.

   Call with:
     s   = Pointer to 8-bit data;
     n   = Number of source bytes to encode (SEE NOTE).
           If it's a null-terminated string, you can use -1 here.
     out = Address of output buffer.
     len = Length of output buffer (should > 4/3 longer than input).

   Returns:
     >= 0 if OK, number of bytes placed in output buffer,
          with the subsequent byte set to NUL if space permits.
     -1 on error (output buffer space exhausted).

   NOTE:
     If this function is to be called repeatedly, e.g. to encode a data
     stream a chunk at a time, the source length must be a multiple of 3
     in all calls but the final one to avoid the generation of extraneous
     pad characters that would throw the decoder out of sync.  When encoding
     only a single string, this is not a consideration.  No internal state
     is kept, so there is no reset function.
*/
int
b8tob64(s,n,out,len) char * s,* out; int n, len; {
    int b3, b4, i, x = 0;
    unsigned int t;

    if (n < 0) n = strlen(s);

    for (i = 0; i < n; i += 3,x += 4) { /* Loop through source bytes */
	b3 = b4 = 0;
	t = (unsigned)((unsigned)((unsigned)s[i] & 0xff) << 8);
	if (n - 1 > i) {		/* Do we have another after this? */
            t |= (unsigned)(s[i+1] & 0xff); /* Yes, OR it in */
            b3 = 1;			/* And remember */
        }
        t <<= 8;			/* Move over */
        if (n - 2 > i) {		/* Another one after that? */
            t |= (unsigned)(s[i+2] & 0xff); /* Yes, OR it in */
            b4 = 1;			/* and remember */
        }
	if (x + 4 > len)		/* Check output space */
	  return(-1);
	out[x+3] = b64[b4 ? (t & 0x3f) : 64]; /* 64 = code for '=' */
        t >>= 6;
        out[x+2] = b64[b3 ? (t & 0x3f) : 64];
        t >>= 6;
        out[x+1] = b64[t & 0x3f];
        t >>= 6;
        out[x]   = b64[t & 0x3f];
    }
    if (x < len) out[x] = NUL;		/* Null-terminate the string */
    return(x);
}


/*
   B 6 4 T O B 8  --  Converts Base64 string to 8-bit data.

   Call with:
     s   = pointer to Base64 string (whitespace ignored).
     n   = length of string, or -1 if null terminated, or 0 to reset.
     out = address of output buffer.
     len = length of output buffer.

   Returns:
     >= 0 if OK, number of bytes placed in output buffer,
          with the subsequent byte set to NUL if space permits.
     <  0 on error:
       -1 = output buffer too small for input.
       -2 = input contains illegal characters.
       -3 = internal coding error.

   NOTE:
     Can be called repeatedly to decode a Base64 stream, one chunk at a
     time.  However, if it is to be called for multiple streams in
     succession, its internal state must be reset at the beginning of
     the new stream.
*/
int
b64tob8(s,n,out,len) char * s,* out; int len; {	/* Decode */
    static int bits = 0;
    static unsigned int r = 0;
    int i, k = 0, x, t;
    unsigned char c;

    if (n == 0) {			/* Reset state */
	bits = 0;
	r = 0;
	return(0);
    }
    x = (n < 0) ? strlen(s) : n;	/* Source length */

    n = ((x + 3) / 4) * 3;		/* Compute destination length */
    if (x > 0 && s[x-1] == '=') n--;	/* Account for padding */
    if (x > 1 && s[x-2] == '=') n--;
    if (n > len)			/* Destination not big enough */
      return(-1);			/* Fail */

    for (i = 0; i < x; i++) {		/* Loop thru source */
	c = (unsigned)s[i];		/* Next char */
        t = b64tbl[c];			/* Code for this char */
	if (t == -2) {			/* Whitespace or Ctrl */
	    n--;			/* Ignore */
	    continue;
	} else if (t == -1) {		/* Illegal code */
	    return(-2);			/* Fail. */
	} else if (t > 63 || t < 0)	/* Illegal value */
	  return(-3);			/* fail. */
	bits += 6;			/* Count bits */
	r <<= 6;			/* Make space */
	r |= (unsigned) t;		/* OR in new code */
	if (bits >= 8) {		/* Have a byte yet? */
	    bits -= 8;			/* Output it */
	    c = (unsigned) ((r >> bits) & 0xff);
	    out[k++] = c;
	}
    }
    if (k < len) out[k] = NUL;		/* Null-terminate in case it's */
    return(k);				/* a text string */
}
#endif /* NOB64 */

/* C H K N U M  --  See if argument string is an integer  */

/* Returns 1 if OK, zero if not OK */
/* If OK, string should be acceptable to atoi() */
/* Allows leading space, sign */

int
chknum(s) char *s; {			/* Check Numeric String */
    int x = 0;				/* Flag for past leading space */
    int y = 0;				/* Flag for digit seen */
    char c;
    debug(F110,"chknum",s,0);
    while (c = *s++) {			/* For each character in the string */
	switch (c) {
	  case SP:			/* Allow leading spaces */
	  case HT:
	    if (x == 0) continue;
	    else return(0);
	  case '+':			/* Allow leading sign */
	  case '-':
	    if (x == 0) x = 1;
	    else return(0);
	    break;
	  default:			/* After that, only decimal digits */
	    if (c >= '0' && c <= '9') {
		x = y = 1;
		continue;
	    } else return(0);
	}
    }
    return(y);
}


/*  R D I G I T S  -- Verify that all characters in arg ARE DIGITS  */

/*  Returns 1 if so, 0 if not or if string is empty */

int
rdigits(s) char *s; {
    if (!s) return(0);
    do {
        if (!isdigit(*s)) return(0);
        s++;
    } while (*s);
    return(1);
}

/*  P A R N A M  --  Return parity name */

char *
#ifdef CK_ANSIC
parnam(char c)
#else
parnam(c) char c;
#endif /* CK_ANSIC */
/* parnam */ {
    switch (c) {
	case 'e': return("even");
	case 'o': return("odd");
	case 'm': return("mark");
	case 's': return("space");
	case 0:   return("none");
	default:  return("invalid");
    }
}

char *					/* Convert seconds to hh:mm:ss */
#ifdef CK_ANSIC
hhmmss(long x)
#else
hhmmss(x) long x;
#endif /* CK_ANSIC */
/* hhmmss(x) */ {
    static char buf[10];
    long s, h, m;
    h = x / 3600L;			/* Hours */
    x = x % 3600L;
    m = x / 60L;			/* Minutes */
    s = x % 60L;			/* Seconds */
    if (x > -1L)
      sprintf(buf,"%02ld:%02ld:%02ld",h,m,s);
    else
      buf[0] = NUL;
    return((char *)buf);
}

/* L S E T  --  Set s into p, right padding to length n with char c; */
/*
   s is a NUL-terminated string.
   If length(s) > n, only n bytes are moved.
   The result is NOT NUL terminated unless c == NUL and length(s) < n.
   The intended of this routine is for filling in fixed-length record fields.
*/
VOID
lset(p,s,n,c) char *s; char *p; int n; int c; {
    int x;
#ifndef USE_MEMCPY
    int i;
#endif /* USE_MEMCPY */
    if (!s) s = "";
    x = strlen(s);
    if (x > n) x = n;
#ifdef USE_MEMCPY
    memcpy(p,s,x);
    if (n > x)
      memset(p+x,c,n-x);
#else
    for (i = 0; i < x; i++)
      *p++ = *s++;
    for (; i < n; i++)
      *p++ = c;
#endif /* USE_MEMCPY */
}

/* R S E T  --  Right-adjust s in p, left padding to length n with char c */

VOID
rset(p,s,n,c) char *s; char *p; int n; int c; {
    int x;
#ifndef USE_MEMCPY
    int i;
#endif /* USE_MEMCPY */
    if (!s) s = "";
    x = strlen(s);
    if (x > n) x = n;
#ifdef USE_MEMCPY
    memset(p,c,n-x);
    memcpy(p+n-x,s,x);
#else
    for (i = 0; i < (n - x); i++)
      *p++ = c;
    for (; i < n; i++)
      *p++ = *s++;
#endif /* USE_MEMCPY */
}

/*  U L O N G T O H E X  --  Unsigned long to hex  */

/*
  Converts unsigned long arg to hex and returns string pointer to
  rightmost n hex digits left padded with 0's.  Allows for longs
  up to 64 bits.  Returns pointer to result.
*/
char *
ulongtohex(z,n) unsigned long z; int n; {
    static char hexbuf[17];
    int i = 16, x, k = 0;
    hexbuf[16] = '\0';
    if (n > 16) n = 16;
    k = 2 * (sizeof(long));
    for (i = 0; i < n; i++) {
	if (i > k || z == 0) {
	    hexbuf[15-i] = '0';
	} else {
	    x = z & 0x0f;
	    z = z >> 4;
	    hexbuf[15-i] = x + ((x < 10) ? '0' : 0x37);
	}
    }
    return((char *)(&hexbuf[16-i]));
}

/*  H E X T O U L O N G  --  Hex string to unsigned long  */

/*
  Converts n chars from s from hex to unsigned long.
  Returns:
   0L or positive, good result (0L is returned if arg is NULL or empty).
  -1L on error: non-hex arg or overflow.
*/
long
hextoulong(s,n) char *s; int n; {
    char buf[64];
    unsigned long result = 0L;
    int d, count = 0, i;
    int flag = 0;
    if (!s) s = "";
    if (!*s) {
	return(0L);
    }
    if (n < 1)
      return(0L);
    if (n > 63) n = 63;
    strncpy(buf,s,n);
    buf[n] = '\0';
    s = buf;
    while (*s) {
	d = *s++;
	if ((d == '0' || d == ' ')) {
	    if (!flag)
	      continue;
	} else {
	    flag = 1;
	}
	if (islower(d))
	  d = toupper(d);
	if (d >= '0' && d <= '9') {
	    d -= 0x30;
	} else if (d >= 'A' && d <= 'F') {
	    d -= 0x37;
	} else {
	    return(-1L);
	}
	if (++count > (sizeof(long) * 2))
	  return(-1L);
	result = (result << 4) | (d & 0x0f);
    }
    return(result);
}

/* End of ckclib.c */