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ruby--ruby/util.c
Nobuyoshi Nakada 2adbf01ae1
dtoa.c: make thread-safe by using atomic CAS
2021-01-10 18:19:53 +09:00

611 lines
16 KiB
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/**********************************************************************
util.c -
$Author$
created at: Fri Mar 10 17:22:34 JST 1995
Copyright (C) 1993-2008 Yukihiro Matsumoto
**********************************************************************/
#if defined __MINGW32__ || defined __MINGW64__
# define MINGW_HAS_SECURE_API 1
#endif
#include "ruby/internal/config.h"
#include <ctype.h>
#include <errno.h>
#include <float.h>
#include <math.h>
#include <stdio.h>
#ifdef _WIN32
# include "missing/file.h"
#endif
#include "internal.h"
#include "internal/sanitizers.h"
#include "internal/util.h"
#include "ruby/util.h"
#include "ruby_atomic.h"
const char ruby_hexdigits[] = "0123456789abcdef0123456789ABCDEF";
#define hexdigit ruby_hexdigits
unsigned long
ruby_scan_oct(const char *start, size_t len, size_t *retlen)
{
register const char *s = start;
register unsigned long retval = 0;
size_t i;
for (i = 0; i < len; i++) {
if ((s[0] < '0') || ('7' < s[0])) {
break;
}
retval <<= 3;
retval |= *s++ - '0';
}
*retlen = (int)(s - start); /* less than len */
return retval;
}
unsigned long
ruby_scan_hex(const char *start, size_t len, size_t *retlen)
{
register const char *s = start;
register unsigned long retval = 0;
const char *tmp;
size_t i = 0;
for (i = 0; i < len; i++) {
if (! s[0]) {
break;
}
tmp = strchr(hexdigit, *s);
if (! tmp) {
break;
}
retval <<= 4;
retval |= (tmp - hexdigit) & 15;
s++;
}
*retlen = (int)(s - start); /* less than len */
return retval;
}
const signed char ruby_digit36_to_number_table[] = {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
/*0*/ -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,
/*2*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
/*3*/ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1,
/*4*/ -1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
/*5*/ 25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1,
/*6*/ -1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
/*7*/ 25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1,
/*8*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
/*9*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
/*a*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
/*b*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
/*c*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
/*d*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
/*e*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
/*f*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
};
NO_SANITIZE("unsigned-integer-overflow", extern unsigned long ruby_scan_digits(const char *str, ssize_t len, int base, size_t *retlen, int *overflow));
unsigned long
ruby_scan_digits(const char *str, ssize_t len, int base, size_t *retlen, int *overflow)
{
const char *start = str;
unsigned long ret = 0, x;
unsigned long mul_overflow = (~(unsigned long)0) / base;
*overflow = 0;
if (!len) {
*retlen = 0;
return 0;
}
do {
int d = ruby_digit36_to_number_table[(unsigned char)*str++];
if (d == -1 || base <= d) {
--str;
break;
}
if (mul_overflow < ret)
*overflow = 1;
ret *= base;
x = ret;
ret += d;
if (ret < x)
*overflow = 1;
} while (len < 0 || --len);
*retlen = str - start;
return ret;
}
unsigned long
ruby_strtoul(const char *str, char **endptr, int base)
{
int c, b, overflow;
int sign = 0;
size_t len;
unsigned long ret;
const char *subject_found = str;
if (base == 1 || 36 < base) {
errno = EINVAL;
return 0;
}
while ((c = *str) && ISSPACE(c))
str++;
if (c == '+') {
sign = 1;
str++;
}
else if (c == '-') {
sign = -1;
str++;
}
if (str[0] == '0') {
subject_found = str+1;
if (base == 0 || base == 16) {
if (str[1] == 'x' || str[1] == 'X') {
b = 16;
str += 2;
}
else {
b = base == 0 ? 8 : 16;
str++;
}
}
else {
b = base;
str++;
}
}
else {
b = base == 0 ? 10 : base;
}
ret = ruby_scan_digits(str, -1, b, &len, &overflow);
if (0 < len)
subject_found = str+len;
if (endptr)
*endptr = (char*)subject_found;
if (overflow) {
errno = ERANGE;
return ULONG_MAX;
}
if (sign < 0) {
ret = (unsigned long)(-(long)ret);
return ret;
}
else {
return ret;
}
}
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if defined(HAVE_FCNTL_H)
#include <fcntl.h>
#endif
#ifndef S_ISDIR
# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
typedef int (cmpfunc_t)(const void*, const void*, void*);
#if defined HAVE_QSORT_S && defined RUBY_MSVCRT_VERSION
/* In contrast to its name, Visual Studio qsort_s is incompatible with
* C11 in the order of the comparison function's arguments, and same
* as BSD qsort_r rather. */
# define qsort_r(base, nel, size, arg, cmp) qsort_s(base, nel, size, cmp, arg)
# define cmp_bsd_qsort cmp_ms_qsort
# define HAVE_BSD_QSORT_R 1
#endif
#if defined HAVE_BSD_QSORT_R
struct bsd_qsort_r_args {
cmpfunc_t *cmp;
void *arg;
};
static int
cmp_bsd_qsort(void *d, const void *a, const void *b)
{
const struct bsd_qsort_r_args *args = d;
return (*args->cmp)(a, b, args->arg);
}
void
ruby_qsort(void* base, const size_t nel, const size_t size, cmpfunc_t *cmp, void *d)
{
struct bsd_qsort_r_args args;
args.cmp = cmp;
args.arg = d;
qsort_r(base, nel, size, &args, cmp_bsd_qsort);
}
#elif defined HAVE_QSORT_S
/* C11 qsort_s has the same arguments as GNU's, but uses
* runtime-constraints handler. */
void
ruby_qsort(void* base, const size_t nel, const size_t size, cmpfunc_t *cmp, void *d)
{
if (!nel || !size) return; /* nothing to sort */
/* get rid of runtime-constraints handler for MT-safeness */
if (!base || !cmp) return;
if (nel > RSIZE_MAX || size > RSIZE_MAX) return;
qsort_s(base, nel, size, cmp, d);
}
# define HAVE_GNU_QSORT_R 1
#elif !defined HAVE_GNU_QSORT_R
/* mm.c */
#define mmtype long
#define mmcount (16 / SIZEOF_LONG)
#define A ((mmtype*)a)
#define B ((mmtype*)b)
#define C ((mmtype*)c)
#define D ((mmtype*)d)
#define mmstep (sizeof(mmtype) * mmcount)
#define mmprepare(base, size) do {\
if (((VALUE)(base) % sizeof(mmtype)) == 0 && ((size) % sizeof(mmtype)) == 0) \
if ((size) >= mmstep) mmkind = 1;\
else mmkind = 0;\
else mmkind = -1;\
high = ((size) / mmstep) * mmstep;\
low = ((size) % mmstep);\
} while (0)\
#define mmarg mmkind, size, high, low
#define mmargdecl int mmkind, size_t size, size_t high, size_t low
static void mmswap_(register char *a, register char *b, mmargdecl)
{
if (a == b) return;
if (mmkind >= 0) {
register mmtype s;
#if mmcount > 1
if (mmkind > 0) {
register char *t = a + high;
do {
s = A[0]; A[0] = B[0]; B[0] = s;
s = A[1]; A[1] = B[1]; B[1] = s;
#if mmcount > 2
s = A[2]; A[2] = B[2]; B[2] = s;
#if mmcount > 3
s = A[3]; A[3] = B[3]; B[3] = s;
#endif
#endif
a += mmstep; b += mmstep;
} while (a < t);
}
#endif
if (low != 0) { s = A[0]; A[0] = B[0]; B[0] = s;
#if mmcount > 2
if (low >= 2 * sizeof(mmtype)) { s = A[1]; A[1] = B[1]; B[1] = s;
#if mmcount > 3
if (low >= 3 * sizeof(mmtype)) {s = A[2]; A[2] = B[2]; B[2] = s;}
#endif
}
#endif
}
}
else {
register char *t = a + size, s;
do {s = *a; *a++ = *b; *b++ = s;} while (a < t);
}
}
#define mmswap(a,b) mmswap_((a),(b),mmarg)
/* a, b, c = b, c, a */
static void mmrot3_(register char *a, register char *b, register char *c, mmargdecl)
{
if (mmkind >= 0) {
register mmtype s;
#if mmcount > 1
if (mmkind > 0) {
register char *t = a + high;
do {
s = A[0]; A[0] = B[0]; B[0] = C[0]; C[0] = s;
s = A[1]; A[1] = B[1]; B[1] = C[1]; C[1] = s;
#if mmcount > 2
s = A[2]; A[2] = B[2]; B[2] = C[2]; C[2] = s;
#if mmcount > 3
s = A[3]; A[3] = B[3]; B[3] = C[3]; C[3] = s;
#endif
#endif
a += mmstep; b += mmstep; c += mmstep;
} while (a < t);
}
#endif
if (low != 0) { s = A[0]; A[0] = B[0]; B[0] = C[0]; C[0] = s;
#if mmcount > 2
if (low >= 2 * sizeof(mmtype)) { s = A[1]; A[1] = B[1]; B[1] = C[1]; C[1] = s;
#if mmcount > 3
if (low == 3 * sizeof(mmtype)) {s = A[2]; A[2] = B[2]; B[2] = C[2]; C[2] = s;}
#endif
}
#endif
}
}
else {
register char *t = a + size, s;
do {s = *a; *a++ = *b; *b++ = *c; *c++ = s;} while (a < t);
}
}
#define mmrot3(a,b,c) mmrot3_((a),(b),(c),mmarg)
/* qs6.c */
/*****************************************************/
/* */
/* qs6 (Quick sort function) */
/* */
/* by Tomoyuki Kawamura 1995.4.21 */
/* kawamura@tokuyama.ac.jp */
/*****************************************************/
typedef struct { char *LL, *RR; } stack_node; /* Stack structure for L,l,R,r */
#define PUSH(ll,rr) do { top->LL = (ll); top->RR = (rr); ++top; } while (0) /* Push L,l,R,r */
#define POP(ll,rr) do { --top; (ll) = top->LL; (rr) = top->RR; } while (0) /* Pop L,l,R,r */
#define med3(a,b,c) ((*cmp)((a),(b),d)<0 ? \
((*cmp)((b),(c),d)<0 ? (b) : ((*cmp)((a),(c),d)<0 ? (c) : (a))) : \
((*cmp)((b),(c),d)>0 ? (b) : ((*cmp)((a),(c),d)<0 ? (a) : (c))))
void
ruby_qsort(void* base, const size_t nel, const size_t size, cmpfunc_t *cmp, void *d)
{
register char *l, *r, *m; /* l,r:left,right group m:median point */
register int t, eq_l, eq_r; /* eq_l: all items in left group are equal to S */
char *L = base; /* left end of current region */
char *R = (char*)base + size*(nel-1); /* right end of current region */
size_t chklim = 63; /* threshold of ordering element check */
enum {size_bits = sizeof(size) * CHAR_BIT};
stack_node stack[size_bits]; /* enough for size_t size */
stack_node *top = stack;
int mmkind;
size_t high, low, n;
if (nel <= 1) return; /* need not to sort */
mmprepare(base, size);
goto start;
nxt:
if (stack == top) return; /* return if stack is empty */
POP(L,R);
for (;;) {
start:
if (L + size == R) { /* 2 elements */
if ((*cmp)(L,R,d) > 0) mmswap(L,R); goto nxt;
}
l = L; r = R;
n = (r - l + size) / size; /* number of elements */
m = l + size * (n >> 1); /* calculate median value */
if (n >= 60) {
register char *m1;
register char *m3;
if (n >= 200) {
n = size*(n>>3); /* number of bytes in splitting 8 */
{
register char *p1 = l + n;
register char *p2 = p1 + n;
register char *p3 = p2 + n;
m1 = med3(p1, p2, p3);
p1 = m + n;
p2 = p1 + n;
p3 = p2 + n;
m3 = med3(p1, p2, p3);
}
}
else {
n = size*(n>>2); /* number of bytes in splitting 4 */
m1 = l + n;
m3 = m + n;
}
m = med3(m1, m, m3);
}
if ((t = (*cmp)(l,m,d)) < 0) { /*3-5-?*/
if ((t = (*cmp)(m,r,d)) < 0) { /*3-5-7*/
if (chklim && nel >= chklim) { /* check if already ascending order */
char *p;
chklim = 0;
for (p=l; p<r; p+=size) if ((*cmp)(p,p+size,d) > 0) goto fail;
goto nxt;
}
fail: goto loopA; /*3-5-7*/
}
if (t > 0) {
if ((*cmp)(l,r,d) <= 0) {mmswap(m,r); goto loopA;} /*3-5-4*/
mmrot3(r,m,l); goto loopA; /*3-5-2*/
}
goto loopB; /*3-5-5*/
}
if (t > 0) { /*7-5-?*/
if ((t = (*cmp)(m,r,d)) > 0) { /*7-5-3*/
if (chklim && nel >= chklim) { /* check if already ascending order */
char *p;
chklim = 0;
for (p=l; p<r; p+=size) if ((*cmp)(p,p+size,d) < 0) goto fail2;
while (l<r) {mmswap(l,r); l+=size; r-=size;} /* reverse region */
goto nxt;
}
fail2: mmswap(l,r); goto loopA; /*7-5-3*/
}
if (t < 0) {
if ((*cmp)(l,r,d) <= 0) {mmswap(l,m); goto loopB;} /*7-5-8*/
mmrot3(l,m,r); goto loopA; /*7-5-6*/
}
mmswap(l,r); goto loopA; /*7-5-5*/
}
if ((t = (*cmp)(m,r,d)) < 0) {goto loopA;} /*5-5-7*/
if (t > 0) {mmswap(l,r); goto loopB;} /*5-5-3*/
/* determining splitting type in case 5-5-5 */ /*5-5-5*/
for (;;) {
if ((l += size) == r) goto nxt; /*5-5-5*/
if (l == m) continue;
if ((t = (*cmp)(l,m,d)) > 0) {mmswap(l,r); l = L; goto loopA;}/*575-5*/
if (t < 0) {mmswap(L,l); l = L; goto loopB;} /*535-5*/
}
loopA: eq_l = 1; eq_r = 1; /* splitting type A */ /* left <= median < right */
for (;;) {
for (;;) {
if ((l += size) == r)
{l -= size; if (l != m) mmswap(m,l); l -= size; goto fin;}
if (l == m) continue;
if ((t = (*cmp)(l,m,d)) > 0) {eq_r = 0; break;}
if (t < 0) eq_l = 0;
}
for (;;) {
if (l == (r -= size))
{l -= size; if (l != m) mmswap(m,l); l -= size; goto fin;}
if (r == m) {m = l; break;}
if ((t = (*cmp)(r,m,d)) < 0) {eq_l = 0; break;}
if (t == 0) break;
}
mmswap(l,r); /* swap left and right */
}
loopB: eq_l = 1; eq_r = 1; /* splitting type B */ /* left < median <= right */
for (;;) {
for (;;) {
if (l == (r -= size))
{r += size; if (r != m) mmswap(r,m); r += size; goto fin;}
if (r == m) continue;
if ((t = (*cmp)(r,m,d)) < 0) {eq_l = 0; break;}
if (t > 0) eq_r = 0;
}
for (;;) {
if ((l += size) == r)
{r += size; if (r != m) mmswap(r,m); r += size; goto fin;}
if (l == m) {m = r; break;}
if ((t = (*cmp)(l,m,d)) > 0) {eq_r = 0; break;}
if (t == 0) break;
}
mmswap(l,r); /* swap left and right */
}
fin:
if (eq_l == 0) /* need to sort left side */
if (eq_r == 0) /* need to sort right side */
if (l-L < R-r) {PUSH(r,R); R = l;} /* sort left side first */
else {PUSH(L,l); L = r;} /* sort right side first */
else R = l; /* need to sort left side only */
else if (eq_r == 0) L = r; /* need to sort right side only */
else goto nxt; /* need not to sort both sides */
}
}
#endif /* HAVE_GNU_QSORT_R */
char *
ruby_strdup(const char *str)
{
char *tmp;
size_t len = strlen(str) + 1;
tmp = xmalloc(len);
memcpy(tmp, str, len);
return tmp;
}
char *
ruby_getcwd(void)
{
#if defined HAVE_GETCWD
# undef RUBY_UNTYPED_DATA_WARNING
# define RUBY_UNTYPED_DATA_WARNING 0
# if defined NO_GETCWD_MALLOC
VALUE guard = Data_Wrap_Struct((VALUE)0, NULL, RUBY_DEFAULT_FREE, NULL);
int size = 200;
char *buf = xmalloc(size);
while (!getcwd(buf, size)) {
int e = errno;
if (e != ERANGE) {
xfree(buf);
DATA_PTR(guard) = NULL;
rb_syserr_fail(e, "getcwd");
}
size *= 2;
DATA_PTR(guard) = buf;
buf = xrealloc(buf, size);
}
# else
VALUE guard = Data_Wrap_Struct((VALUE)0, NULL, free, NULL);
char *buf, *cwd = getcwd(NULL, 0);
DATA_PTR(guard) = cwd;
if (!cwd) rb_sys_fail("getcwd");
buf = ruby_strdup(cwd); /* allocate by xmalloc */
free(cwd);
# endif
DATA_PTR(RB_GC_GUARD(guard)) = NULL;
#else
# ifndef PATH_MAX
# define PATH_MAX 8192
# endif
char *buf = xmalloc(PATH_MAX+1);
if (!getwd(buf)) {
int e = errno;
xfree(buf);
rb_syserr_fail(e, "getwd");
}
#endif
return buf;
}
void
ruby_each_words(const char *str, void (*func)(const char*, int, void*), void *arg)
{
const char *end;
int len;
if (!str) return;
for (; *str; str = end) {
while (ISSPACE(*str) || *str == ',') str++;
if (!*str) break;
end = str;
while (*end && !ISSPACE(*end) && *end != ',') end++;
len = (int)(end - str); /* assume no string exceeds INT_MAX */
(*func)(str, len, arg);
}
}
#undef strtod
#define strtod ruby_strtod
#undef dtoa
#define dtoa ruby_dtoa
#undef hdtoa
#define hdtoa ruby_hdtoa
#include "missing/dtoa.c"
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