mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-19 01:34:32 +00:00
1679e8205e
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7849 91177308-0d34-0410-b5e6-96231b3b80d8
119 lines
3.9 KiB
C
119 lines
3.9 KiB
C
//===-- atox.c - Ascii string parsers for LLVM libc Library -------*- C -*-===//
|
|
//
|
|
// A lot of this code is ripped gratuitously from glibc and libiberty.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
#define isspace(x) ((x) == ' ' || (x) == '\t' || (x) == '\n')
|
|
#define isdigit(x) ((x) >= '0' && (x) <= '9')
|
|
#define isupper(x) ((x) >= 'A' && (x) <= 'Z')
|
|
#define islower(x) ((x) >= 'a' && (x) <= 'z')
|
|
#define isalpha(x) (isupper(x) || islower(x))
|
|
|
|
#ifndef ULONG_MAX
|
|
#define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */
|
|
#endif
|
|
|
|
#ifndef LONG_MAX
|
|
#define LONG_MAX ((long)(ULONG_MAX >> 1)) /* 0x7FFFFFFF */
|
|
#endif
|
|
|
|
#ifndef LONG_MIN
|
|
#define LONG_MIN ((long)(~LONG_MAX)) /* 0x80000000 */
|
|
#endif
|
|
|
|
#if 0
|
|
/*
|
|
* Convert a string to a long integer.
|
|
*
|
|
* Ignores `locale' stuff. Assumes that the upper and lower case
|
|
* alphabets and digits are each contiguous.
|
|
*/
|
|
long strtol(const char *nptr, char **endptr, 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;
|
|
}
|
|
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;
|
|
} else if (neg)
|
|
acc = -acc;
|
|
if (endptr != 0)
|
|
*endptr = (char *) (any ? s - 1 : nptr);
|
|
return (acc);
|
|
}
|
|
|
|
|
|
/* Convert a string to an int. */
|
|
int atoi(const char *nptr) {
|
|
return (int)strtol(nptr, 0, 10);
|
|
}
|
|
|
|
/* Convert a string to a long int. */
|
|
long int atol(const char *nptr) {
|
|
return strtol(nptr, 0, 10);
|
|
}
|
|
#endif
|