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* numbers.c (scm_istr2int): If the number is short (as most

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numbers are), just call scm_small_istr2int to deal with it.
(scm_small_istr2int): New function, created by un-#ifdefing the
non-bignum version of scm_istr2int and renaming it.
This commit is contained in:
Jim Blandy 1996-10-03 05:18:47 +00:00
parent df13742c0a
commit 2a8fecee87
1 changed files with 51 additions and 53 deletions
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104
libguile/numbers.c
View file

@ -1622,7 +1622,51 @@ scm_bigprint(exp, port, pstate)
/*** END nums->strs ***/
/*** STRINGS -> NUMBERS ***/
#ifdef SCM_BIGDIG
static SCM
scm_small_istr2int(str, len, radix)
char *str;
long len;
long radix;
{
register long n = 0, ln;
register int c;
register int i = 0;
int lead_neg = 0;
if (0 >= len) return SCM_BOOL_F; /* zero scm_length */
switch (*str) { /* leading sign */
case '-': lead_neg = 1;
case '+': if (++i==len) return SCM_BOOL_F; /* bad if lone `+' or `-' */
}
do {
switch (c = str[i++]) {
case DIGITS:
c = c - '0';
goto accumulate;
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
c = c-'A'+10;
goto accumulate;
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
c = c-'a'+10;
accumulate:
if (c >= radix) return SCM_BOOL_F; /* bad digit for radix */
ln = n;
n = n * radix - c;
/* Negation is a workaround for HP700 cc bug */
if (n > ln || (-n > -SCM_MOST_NEGATIVE_FIXNUM)) goto ovfl;
break;
default:
return SCM_BOOL_F; /* not a digit */
}
} while (i < len);
if (!lead_neg) if ((n = -n) > SCM_MOST_POSITIVE_FIXNUM) goto ovfl;
return SCM_MAKINUM(n);
ovfl: /* overflow scheme integer */
return SCM_BOOL_F;
}
#ifdef __STDC__
SCM
scm_istr2int(char *str, long len, long radix)
@ -1643,6 +1687,12 @@ scm_istr2int(str, len, radix)
register unsigned long t2;
if (0 >= len) return SCM_BOOL_F; /* zero scm_length */
/* Short numbers we parse directly into an int, to avoid the overhead
of creating a bignum. */
if (len < 6)
return scm_small_istr2int (str, len, radix);
if (16==radix) j = 1+(4*len*sizeof(char))/(SCM_BITSPERDIG);
else if (10 <= radix)
j = 1+(84*len*sizeof(char))/(SCM_BITSPERDIG*25);
@ -1688,58 +1738,6 @@ scm_istr2int(str, len, radix)
if (j==blen) return res;
return scm_adjbig(res, blen);
}
#else
#ifdef __STDC__
SCM
scm_istr2int(char *str, long len, long radix)
#else
SCM
scm_istr2int(str, len, radix)
char *str;
long len;
long radix;
#endif
{
register long n = 0, ln;
register int c;
register int i = 0;
int lead_neg = 0;
if (0 >= len) return SCM_BOOL_F; /* zero scm_length */
switch (*str) { /* leading sign */
case '-': lead_neg = 1;
case '+': if (++i==len) return SCM_BOOL_F; /* bad if lone `+' or `-' */
}
do {
switch (c = str[i++]) {
case DIGITS:
c = c - '0';
goto accumulate;
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
c = c-'A'+10;
goto accumulate;
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
c = c-'a'+10;
accumulate:
if (c >= radix) return SCM_BOOL_F; /* bad digit for radix */
ln = n;
n = n * radix - c;
/* Negation is a workaround for HP700 cc bug */
if (n > ln || (-n > -SCM_MOST_NEGATIVE_FIXNUM)) goto ovfl;
break;
default:
return SCM_BOOL_F; /* not a digit */
}
} while (i < len);
if (!lead_neg) if ((n = -n) > SCM_MOST_POSITIVE_FIXNUM) goto ovfl;
return SCM_MAKINUM(n);
ovfl: /* overflow scheme integer */
return SCM_BOOL_F;
}
#endif
#ifdef SCM_FLOATS
#ifdef __STDC__