[fusl] clang-format fusl

fusl/src/internal/floatscan.c

 #include <stdint.h>
 #include <stdio.h>
 #include <math.h>
 #include <float.h>
 #include <limits.h>
 #include <errno.h>
 #include <ctype.h>
 
 #include "shgetc.h"
 #include "floatscan.h"
@@ skipping 13 matching lines @@
 #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
 
 #define LD_B1B_DIG 4
 #define LD_B1B_MAX 10384593, 717069655, 257060992, 658440191
 #define KMAX 2048
 
 #else
 #error Unsupported long double representation
 #endif
 
-#define MASK (KMAX-1)
-
-#define CONCAT2(x,y) x ## y
-#define CONCAT(x,y) CONCAT2(x,y)
-
-static long long scanexp(FILE *f, int pok)
-{
-        int c;
-        int x;
-        long long y;
-        int neg = 0;
-        
-        c = shgetc(f);
-        if (c=='+' || c=='-') {
-                neg = (c=='-');
-                c = shgetc(f);
-                if (c-'0'>=10U && pok) shunget(f);
-        }
-        if (c-'0'>=10U) {
-                shunget(f);
-                return LLONG_MIN;
-        }
-        for (x=0; c-'0'<10U && x<INT_MAX/10; c = shgetc(f))
-                x = 10*x + c-'0';
-        for (y=x; c-'0'<10U && y<LLONG_MAX/100; c = shgetc(f))
-                y = 10*y + c-'0';
-        for (; c-'0'<10U; c = shgetc(f));
-        shunget(f);
-        return neg ? -y : y;
+#define MASK (KMAX - 1)
+
+#define CONCAT2(x, y) x##y
+#define CONCAT(x, y) CONCAT2(x, y)
+
+static long long scanexp(FILE* f, int pok) {
+  int c;
+  int x;
+  long long y;
+  int neg = 0;
+
+  c = shgetc(f);
+  if (c == '+' || c == '-') {
+    neg = (c == '-');
+    c = shgetc(f);
+    if (c - '0' >= 10U && pok)
+      shunget(f);
+  }
+  if (c - '0' >= 10U) {
+    shunget(f);
+    return LLONG_MIN;
+  }
+  for (x = 0; c - '0' < 10U && x < INT_MAX / 10; c = shgetc(f))
+    x = 10 * x + c - '0';
+  for (y = x; c - '0' < 10U && y < LLONG_MAX / 100; c = shgetc(f))
+    y = 10 * y + c - '0';
+  for (; c - '0' < 10U; c = shgetc(f))
+    ;
+  shunget(f);
+  return neg ? -y : y;
 }
 
-
-static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int pok)
-{
-        uint32_t x[KMAX];
-        static const uint32_t th[] = { LD_B1B_MAX };
-        int i, j, k, a, z;
-        long long lrp=0, dc=0;
-        long long e10=0;
-        int lnz = 0;
-        int gotdig = 0, gotrad = 0;
-        int rp;
-        int e2;
-        int emax = -emin-bits+3;
-        int denormal = 0;
-        long double y;
-        long double frac=0;
-        long double bias=0;
-        static const int p10s[] = { 10, 100, 1000, 10000,
-                100000, 1000000, 10000000, 100000000 };
-
-        j=0;
-        k=0;
-
-        /* Don't let leading zeros consume buffer space */
-        for (; c=='0'; c = shgetc(f)) gotdig=1;
-        if (c=='.') {
-                gotrad = 1;
-                for (c = shgetc(f); c=='0'; c = shgetc(f)) gotdig=1, lrp--;
-        }
-
-        x[0] = 0;
-        for (; c-'0'<10U || c=='.'; c = shgetc(f)) {
-                if (c == '.') {
-                        if (gotrad) break;
-                        gotrad = 1;
-                        lrp = dc;
-                } else if (k < KMAX-3) {
-                        dc++;
-                        if (c!='0') lnz = dc;
-                        if (j) x[k] = x[k]*10 + c-'0';
-                        else x[k] = c-'0';
-                        if (++j==9) {
-                                k++;
-                                j=0;
-                        }
-                        gotdig=1;
-                } else {
-                        dc++;
-                        if (c!='0') x[KMAX-4] |= 1;
-                }
-        }
-        if (!gotrad) lrp=dc;
-
-        if (gotdig && (c|32)=='e') {
-                e10 = scanexp(f, pok);
-                if (e10 == LLONG_MIN) {
-                        if (pok) {
-                                shunget(f);
-                        } else {
-                                shlim(f, 0);
-                                return 0;
-                        }
-                        e10 = 0;
-                }
-                lrp += e10;
-        } else if (c>=0) {
-                shunget(f);
-        }
-        if (!gotdig) {
-                errno = EINVAL;
-                shlim(f, 0);
-                return 0;
-        }
-
-        /* Handle zero specially to avoid nasty special cases later */
-        if (!x[0]) return sign * 0.0;
-
-        /* Optimize small integers (w/no exponent) and over/under-flow */
-        if (lrp==dc && dc<10 && (bits>30 || x[0]>>bits==0))
-                return sign * (long double)x[0];
-        if (lrp > -emin/2) {
-                errno = ERANGE;
-                return sign * LDBL_MAX * LDBL_MAX;
-        }
-        if (lrp < emin-2*LDBL_MANT_DIG) {
-                errno = ERANGE;
-                return sign * LDBL_MIN * LDBL_MIN;
-        }
-
-        /* Align incomplete final B1B digit */
-        if (j) {
-                for (; j<9; j++) x[k]*=10;
-                k++;
-                j=0;
-        }
-
-        a = 0;
-        z = k;
-        e2 = 0;
-        rp = lrp;
-
-        /* Optimize small to mid-size integers (even in exp. notation) */
-        if (lnz<9 && lnz<=rp && rp < 18) {
-                if (rp == 9) return sign * (long double)x[0];
-                if (rp < 9) return sign * (long double)x[0] / p10s[8-rp];
-                int bitlim = bits-3*(int)(rp-9);
-                if (bitlim>30 || x[0]>>bitlim==0)
-                        return sign * (long double)x[0] * p10s[rp-10];
-        }
-
-        /* Align radix point to B1B digit boundary */
-        if (rp % 9) {
-                int rpm9 = rp>=0 ? rp%9 : rp%9+9;
-                int p10 = p10s[8-rpm9];
-                uint32_t carry = 0;
-                for (k=a; k!=z; k++) {
-                        uint32_t tmp = x[k] % p10;
-                        x[k] = x[k]/p10 + carry;
-                        carry = 1000000000/p10 * tmp;
-                        if (k==a && !x[k]) {
-                                a = (a+1 & MASK);
-                                rp -= 9;
-                        }
-                }
-                if (carry) x[z++] = carry;
-                rp += 9-rpm9;
-        }
-
-        /* Upscale until desired number of bits are left of radix point */
-        while (rp < 9*LD_B1B_DIG || (rp == 9*LD_B1B_DIG && x[a]<th[0])) {
-                uint32_t carry = 0;
-                e2 -= 29;
-                for (k=(z-1 & MASK); ; k=(k-1 & MASK)) {
-                        uint64_t tmp = ((uint64_t)x[k] << 29) + carry;
-                        if (tmp > 1000000000) {
-                                carry = tmp / 1000000000;
-                                x[k] = tmp % 1000000000;
-                        } else {
-                                carry = 0;
-                                x[k] = tmp;
-                        }
-                        if (k==(z-1 & MASK) && k!=a && !x[k]) z = k;
-                        if (k==a) break;
-                }
-                if (carry) {
-                        rp += 9;
-                        a = (a-1 & MASK);
-                        if (a == z) {
-                                z = (z-1 & MASK);
-                                x[z-1 & MASK] |= x[z];
-                        }
-                        x[a] = carry;
-                }
-        }
-
-        /* Downscale until exactly number of bits are left of radix point */
-        for (;;) {
-                uint32_t carry = 0;
-                int sh = 1;
-                for (i=0; i<LD_B1B_DIG; i++) {
-                        k = (a+i & MASK);
-                        if (k == z || x[k] < th[i]) {
-                                i=LD_B1B_DIG;
-                                break;
-                        }
-                        if (x[a+i & MASK] > th[i]) break;
-                }
-                if (i==LD_B1B_DIG && rp==9*LD_B1B_DIG) break;
-                /* FIXME: find a way to compute optimal sh */
-                if (rp > 9+9*LD_B1B_DIG) sh = 9;
-                e2 += sh;
-                for (k=a; k!=z; k=(k+1 & MASK)) {
-                        uint32_t tmp = x[k] & (1<<sh)-1;
-                        x[k] = (x[k]>>sh) + carry;
-                        carry = (1000000000>>sh) * tmp;
-                        if (k==a && !x[k]) {
-                                a = (a+1 & MASK);
-                                i--;
-                                rp -= 9;
-                        }
-                }
-                if (carry) {
-                        if ((z+1 & MASK) != a) {
-                                x[z] = carry;
-                                z = (z+1 & MASK);
-                        } else x[z-1 & MASK] |= 1;
-                }
-        }
-
-        /* Assemble desired bits into floating point variable */
-        for (y=i=0; i<LD_B1B_DIG; i++) {
-                if ((a+i & MASK)==z) x[(z=(z+1 & MASK))-1] = 0;
-                y = 1000000000.0L * y + x[a+i & MASK];
-        }
-
-        y *= sign;
-
-        /* Limit precision for denormal results */
-        if (bits > LDBL_MANT_DIG+e2-emin) {
-                bits = LDBL_MANT_DIG+e2-emin;
-                if (bits<0) bits=0;
-                denormal = 1;
-        }
-
-        /* Calculate bias term to force rounding, move out lower bits */
-        if (bits < LDBL_MANT_DIG) {
-                bias = copysignl(scalbn(1, 2*LDBL_MANT_DIG-bits-1), y);
-                frac = fmodl(y, scalbn(1, LDBL_MANT_DIG-bits));
-                y -= frac;
-                y += bias;
-        }
-
-        /* Process tail of decimal input so it can affect rounding */
-        if ((a+i & MASK) != z) {
-                uint32_t t = x[a+i & MASK];
-                if (t < 500000000 && (t || (a+i+1 & MASK) != z))
-                        frac += 0.25*sign;
-                else if (t > 500000000)
-                        frac += 0.75*sign;
-                else if (t == 500000000) {
-                        if ((a+i+1 & MASK) == z)
-                                frac += 0.5*sign;
-                        else
-                                frac += 0.75*sign;
-                }
-                if (LDBL_MANT_DIG-bits >= 2 && !fmodl(frac, 1))
-                        frac++;
-        }
-
-        y += frac;
-        y -= bias;
-
-        if ((e2+LDBL_MANT_DIG & INT_MAX) > emax-5) {
-                if (fabs(y) >= CONCAT(0x1p, LDBL_MANT_DIG)) {
-                        if (denormal && bits==LDBL_MANT_DIG+e2-emin)
-                                denormal = 0;
-                        y *= 0.5;
-                        e2++;
-                }
-                if (e2+LDBL_MANT_DIG>emax || (denormal && frac))
-                        errno = ERANGE;
-        }
-
-        return scalbnl(y, e2);
+static long double decfloat(FILE* f,
+                            int c,
+                            int bits,
+                            int emin,
+                            int sign,
+                            int pok) {
+  uint32_t x[KMAX];
+  static const uint32_t th[] = {LD_B1B_MAX};
+  int i, j, k, a, z;
+  long long lrp = 0, dc = 0;
+  long long e10 = 0;
+  int lnz = 0;
+  int gotdig = 0, gotrad = 0;
+  int rp;
+  int e2;
+  int emax = -emin - bits + 3;
+  int denormal = 0;
+  long double y;
+  long double frac = 0;
+  long double bias = 0;
+  static const int p10s[] = {10,     100,     1000,     10000,
+                             100000, 1000000, 10000000, 100000000};
+
+  j = 0;
+  k = 0;
+
+  /* Don't let leading zeros consume buffer space */
+  for (; c == '0'; c = shgetc(f))
+    gotdig = 1;
+  if (c == '.') {
+    gotrad = 1;
+    for (c = shgetc(f); c == '0'; c = shgetc(f))
+      gotdig = 1, lrp--;
+  }
+
+  x[0] = 0;
+  for (; c - '0' < 10U || c == '.'; c = shgetc(f)) {
+    if (c == '.') {
+      if (gotrad)
+        break;
+      gotrad = 1;
+      lrp = dc;
+    } else if (k < KMAX - 3) {
+      dc++;
+      if (c != '0')
+        lnz = dc;
+      if (j)
+        x[k] = x[k] * 10 + c - '0';
+      else
+        x[k] = c - '0';
+      if (++j == 9) {
+        k++;
+        j = 0;
+      }
+      gotdig = 1;
+    } else {
+      dc++;
+      if (c != '0')
+        x[KMAX - 4] |= 1;
+    }
+  }
+  if (!gotrad)
+    lrp = dc;
+
+  if (gotdig && (c | 32) == 'e') {
+    e10 = scanexp(f, pok);
+    if (e10 == LLONG_MIN) {
+      if (pok) {
+        shunget(f);
+      } else {
+        shlim(f, 0);
+        return 0;
+      }
+      e10 = 0;
+    }
+    lrp += e10;
+  } else if (c >= 0) {
+    shunget(f);
+  }
+  if (!gotdig) {
+    errno = EINVAL;
+    shlim(f, 0);
+    return 0;
+  }
+
+  /* Handle zero specially to avoid nasty special cases later */
+  if (!x[0])
+    return sign * 0.0;
+
+  /* Optimize small integers (w/no exponent) and over/under-flow */
+  if (lrp == dc && dc < 10 && (bits > 30 || x[0] >> bits == 0))
+    return sign * (long double)x[0];
+  if (lrp > -emin / 2) {
+    errno = ERANGE;
+    return sign * LDBL_MAX * LDBL_MAX;
+  }
+  if (lrp < emin - 2 * LDBL_MANT_DIG) {
+    errno = ERANGE;
+    return sign * LDBL_MIN * LDBL_MIN;
+  }
+
+  /* Align incomplete final B1B digit */
+  if (j) {
+    for (; j < 9; j++)
+      x[k] *= 10;
+    k++;
+    j = 0;
+  }
+
+  a = 0;
+  z = k;
+  e2 = 0;
+  rp = lrp;
+
+  /* Optimize small to mid-size integers (even in exp. notation) */
+  if (lnz < 9 && lnz <= rp && rp < 18) {
+    if (rp == 9)
+      return sign * (long double)x[0];
+    if (rp < 9)
+      return sign * (long double)x[0] / p10s[8 - rp];
+    int bitlim = bits - 3 * (int)(rp - 9);
+    if (bitlim > 30 || x[0] >> bitlim == 0)
+      return sign * (long double)x[0] * p10s[rp - 10];
+  }
+
+  /* Align radix point to B1B digit boundary */
+  if (rp % 9) {
+    int rpm9 = rp >= 0 ? rp % 9 : rp % 9 + 9;
+    int p10 = p10s[8 - rpm9];
+    uint32_t carry = 0;
+    for (k = a; k != z; k++) {
+      uint32_t tmp = x[k] % p10;
+      x[k] = x[k] / p10 + carry;
+      carry = 1000000000 / p10 * tmp;
+      if (k == a && !x[k]) {
+        a = (a + 1 & MASK);
+        rp -= 9;
+      }
+    }
+    if (carry)
+      x[z++] = carry;
+    rp += 9 - rpm9;
+  }
+
+  /* Upscale until desired number of bits are left of radix point */
+  while (rp < 9 * LD_B1B_DIG || (rp == 9 * LD_B1B_DIG && x[a] < th[0])) {
+    uint32_t carry = 0;
+    e2 -= 29;
+    for (k = (z - 1 & MASK);; k = (k - 1 & MASK)) {
+      uint64_t tmp = ((uint64_t)x[k] << 29) + carry;
+      if (tmp > 1000000000) {
+        carry = tmp / 1000000000;
+        x[k] = tmp % 1000000000;
+      } else {
+        carry = 0;
+        x[k] = tmp;
+      }
+      if (k == (z - 1 & MASK) && k != a && !x[k])
+        z = k;
+      if (k == a)
+        break;
+    }
+    if (carry) {
+      rp += 9;
+      a = (a - 1 & MASK);
+      if (a == z) {
+        z = (z - 1 & MASK);
+        x[z - 1 & MASK] |= x[z];
+      }
+      x[a] = carry;
+    }
+  }
+
+  /* Downscale until exactly number of bits are left of radix point */
+  for (;;) {
+    uint32_t carry = 0;
+    int sh = 1;
+    for (i = 0; i < LD_B1B_DIG; i++) {
+      k = (a + i & MASK);
+      if (k == z || x[k] < th[i]) {
+        i = LD_B1B_DIG;
+        break;
+      }
+      if (x[a + i & MASK] > th[i])
+        break;
+    }
+    if (i == LD_B1B_DIG && rp == 9 * LD_B1B_DIG)
+      break;
+    /* FIXME: find a way to compute optimal sh */
+    if (rp > 9 + 9 * LD_B1B_DIG)
+      sh = 9;
+    e2 += sh;
+    for (k = a; k != z; k = (k + 1 & MASK)) {
+      uint32_t tmp = x[k] & (1 << sh) - 1;
+      x[k] = (x[k] >> sh) + carry;
+      carry = (1000000000 >> sh) * tmp;
+      if (k == a && !x[k]) {
+        a = (a + 1 & MASK);
+        i--;
+        rp -= 9;
+      }
+    }
+    if (carry) {
+      if ((z + 1 & MASK) != a) {
+        x[z] = carry;
+        z = (z + 1 & MASK);
+      } else
+        x[z - 1 & MASK] |= 1;
+    }
+  }
+
+  /* Assemble desired bits into floating point variable */
+  for (y = i = 0; i < LD_B1B_DIG; i++) {
+    if ((a + i & MASK) == z)
+      x[(z = (z + 1 & MASK)) - 1] = 0;
+    y = 1000000000.0L * y + x[a + i & MASK];
+  }
+
+  y *= sign;
+
+  /* Limit precision for denormal results */
+  if (bits > LDBL_MANT_DIG + e2 - emin) {
+    bits = LDBL_MANT_DIG + e2 - emin;
+    if (bits < 0)
+      bits = 0;
+    denormal = 1;
+  }
+
+  /* Calculate bias term to force rounding, move out lower bits */
+  if (bits < LDBL_MANT_DIG) {
+    bias = copysignl(scalbn(1, 2 * LDBL_MANT_DIG - bits - 1), y);
+    frac = fmodl(y, scalbn(1, LDBL_MANT_DIG - bits));
+    y -= frac;
+    y += bias;
+  }
+
+  /* Process tail of decimal input so it can affect rounding */
+  if ((a + i & MASK) != z) {
+    uint32_t t = x[a + i & MASK];
+    if (t < 500000000 && (t || (a + i + 1 & MASK) != z))
+      frac += 0.25 * sign;
+    else if (t > 500000000)
+      frac += 0.75 * sign;
+    else if (t == 500000000) {
+      if ((a + i + 1 & MASK) == z)
+        frac += 0.5 * sign;
+      else
+        frac += 0.75 * sign;
+    }
+    if (LDBL_MANT_DIG - bits >= 2 && !fmodl(frac, 1))
+      frac++;
+  }
+
+  y += frac;
+  y -= bias;
+
+  if ((e2 + LDBL_MANT_DIG & INT_MAX) > emax - 5) {
+    if (fabs(y) >= CONCAT(0x1p, LDBL_MANT_DIG)) {
+      if (denormal && bits == LDBL_MANT_DIG + e2 - emin)
+        denormal = 0;
+      y *= 0.5;
+      e2++;
+    }
+    if (e2 + LDBL_MANT_DIG > emax || (denormal && frac))
+      errno = ERANGE;
+  }
+
+  return scalbnl(y, e2);
 }
 
-static long double hexfloat(FILE *f, int bits, int emin, int sign, int pok)
-{
-        uint32_t x = 0;
-        long double y = 0;
-        long double scale = 1;
-        long double bias = 0;
-        int gottail = 0, gotrad = 0, gotdig = 0;
-        long long rp = 0;
-        long long dc = 0;
-        long long e2 = 0;
-        int d;
-        int c;
-
-        c = shgetc(f);
-
-        /* Skip leading zeros */
-        for (; c=='0'; c = shgetc(f)) gotdig = 1;
-
-        if (c=='.') {
-                gotrad = 1;
-                c = shgetc(f);
-                /* Count zeros after the radix point before significand */
-                for (rp=0; c=='0'; c = shgetc(f), rp--) gotdig = 1;
-        }
-
-        for (; c-'0'<10U || (c|32)-'a'<6U || c=='.'; c = shgetc(f)) {
-                if (c=='.') {
-                        if (gotrad) break;
-                        rp = dc;
-                        gotrad = 1;
-                } else {
-                        gotdig = 1;
-                        if (c > '9') d = (c|32)+10-'a';
-                        else d = c-'0';
-                        if (dc<8) {
-                                x = x*16 + d;
-                        } else if (dc < LDBL_MANT_DIG/4+1) {
-                                y += d*(scale/=16);
-                        } else if (d && !gottail) {
-                                y += 0.5*scale;
-                                gottail = 1;
-                        }
-                        dc++;
-                }
-        }
-        if (!gotdig) {
-                shunget(f);
-                if (pok) {
-                        shunget(f);
-                        if (gotrad) shunget(f);
-                } else {
-                        shlim(f, 0);
-                }
-                return sign * 0.0;
-        }
-        if (!gotrad) rp = dc;
-        while (dc<8) x *= 16, dc++;
-        if ((c|32)=='p') {
-                e2 = scanexp(f, pok);
-                if (e2 == LLONG_MIN) {
-                        if (pok) {
-                                shunget(f);
-                        } else {
-                                shlim(f, 0);
-                                return 0;
-                        }
-                        e2 = 0;
-                }
-        } else {
-                shunget(f);
-        }
-        e2 += 4*rp - 32;
-
-        if (!x) return sign * 0.0;
-        if (e2 > -emin) {
-                errno = ERANGE;
-                return sign * LDBL_MAX * LDBL_MAX;
-        }
-        if (e2 < emin-2*LDBL_MANT_DIG) {
-                errno = ERANGE;
-                return sign * LDBL_MIN * LDBL_MIN;
-        }
-
-        while (x < 0x80000000) {
-                if (y>=0.5) {
-                        x += x + 1;
-                        y += y - 1;
-                } else {
-                        x += x;
-                        y += y;
-                }
-                e2--;
-        }
-
-        if (bits > 32+e2-emin) {
-                bits = 32+e2-emin;
-                if (bits<0) bits=0;
-        }
-
-        if (bits < LDBL_MANT_DIG)
-                bias = copysignl(scalbn(1, 32+LDBL_MANT_DIG-bits-1), sign);
-
-        if (bits<32 && y && !(x&1)) x++, y=0;
-
-        y = bias + sign*(long double)x + sign*y;
-        y -= bias;
-
-        if (!y) errno = ERANGE;
-
-        return scalbnl(y, e2);
+static long double hexfloat(FILE* f, int bits, int emin, int sign, int pok) {
+  uint32_t x = 0;
+  long double y = 0;
+  long double scale = 1;
+  long double bias = 0;
+  int gottail = 0, gotrad = 0, gotdig = 0;
+  long long rp = 0;
+  long long dc = 0;
+  long long e2 = 0;
+  int d;
+  int c;
+
+  c = shgetc(f);
+
+  /* Skip leading zeros */
+  for (; c == '0'; c = shgetc(f))
+    gotdig = 1;
+
+  if (c == '.') {
+    gotrad = 1;
+    c = shgetc(f);
+    /* Count zeros after the radix point before significand */
+    for (rp = 0; c == '0'; c = shgetc(f), rp--)
+      gotdig = 1;
+  }
+
+  for (; c - '0' < 10U || (c | 32) - 'a' < 6U || c == '.'; c = shgetc(f)) {
+    if (c == '.') {
+      if (gotrad)
+        break;
+      rp = dc;
+      gotrad = 1;
+    } else {
+      gotdig = 1;
+      if (c > '9')
+        d = (c | 32) + 10 - 'a';
+      else
+        d = c - '0';
+      if (dc < 8) {
+        x = x * 16 + d;
+      } else if (dc < LDBL_MANT_DIG / 4 + 1) {
+        y += d * (scale /= 16);
+      } else if (d && !gottail) {
+        y += 0.5 * scale;
+        gottail = 1;
+      }
+      dc++;
+    }
+  }
+  if (!gotdig) {
+    shunget(f);
+    if (pok) {
+      shunget(f);
+      if (gotrad)
+        shunget(f);
+    } else {
+      shlim(f, 0);
+    }
+    return sign * 0.0;
+  }
+  if (!gotrad)
+    rp = dc;
+  while (dc < 8)
+    x *= 16, dc++;
+  if ((c | 32) == 'p') {
+    e2 = scanexp(f, pok);
+    if (e2 == LLONG_MIN) {
+      if (pok) {
+        shunget(f);
+      } else {
+        shlim(f, 0);
+        return 0;
+      }
+      e2 = 0;
+    }
+  } else {
+    shunget(f);
+  }
+  e2 += 4 * rp - 32;
+
+  if (!x)
+    return sign * 0.0;
+  if (e2 > -emin) {
+    errno = ERANGE;
+    return sign * LDBL_MAX * LDBL_MAX;
+  }
+  if (e2 < emin - 2 * LDBL_MANT_DIG) {
+    errno = ERANGE;
+    return sign * LDBL_MIN * LDBL_MIN;
+  }
+
+  while (x < 0x80000000) {
+    if (y >= 0.5) {
+      x += x + 1;
+      y += y - 1;
+    } else {
+      x += x;
+      y += y;
+    }
+    e2--;
+  }
+
+  if (bits > 32 + e2 - emin) {
+    bits = 32 + e2 - emin;
+    if (bits < 0)
+      bits = 0;
+  }
+
+  if (bits < LDBL_MANT_DIG)
+    bias = copysignl(scalbn(1, 32 + LDBL_MANT_DIG - bits - 1), sign);
+
+  if (bits < 32 && y && !(x & 1))
+    x++, y = 0;
+
+  y = bias + sign * (long double)x + sign * y;
+  y -= bias;
+
+  if (!y)
+    errno = ERANGE;
+
+  return scalbnl(y, e2);
 }
 
-long double __floatscan(FILE *f, int prec, int pok)
-{
-        int sign = 1;
-        size_t i;
-        int bits;
-        int emin;
-        int c;
-
-        switch (prec) {
-        case 0:
-                bits = FLT_MANT_DIG;
-                emin = FLT_MIN_EXP-bits;
-                break;
-        case 1:
-                bits = DBL_MANT_DIG;
-                emin = DBL_MIN_EXP-bits;
-                break;
-        case 2:
-                bits = LDBL_MANT_DIG;
-                emin = LDBL_MIN_EXP-bits;
-                break;
-        default:
-                return 0;
-        }
-
-        while (isspace((c=shgetc(f))));
-
-        if (c=='+' || c=='-') {
-                sign -= 2*(c=='-');
-                c = shgetc(f);
-        }
-
-        for (i=0; i<8 && (c|32)=="infinity"[i]; i++)
-                if (i<7) c = shgetc(f);
-        if (i==3 || i==8 || (i>3 && pok)) {
-                if (i!=8) {
-                        shunget(f);
-                        if (pok) for (; i>3; i--) shunget(f);
-                }
-                return sign * INFINITY;
-        }
-        if (!i) for (i=0; i<3 && (c|32)=="nan"[i]; i++)
-                if (i<2) c = shgetc(f);
-        if (i==3) {
-                if (shgetc(f) != '(') {
-                        shunget(f);
-                        return NAN;
-                }
-                for (i=1; ; i++) {
-                        c = shgetc(f);
-                        if (c-'0'<10U || c-'A'<26U || c-'a'<26U || c=='_')
-                                continue;
-                        if (c==')') return NAN;
-                        shunget(f);
-                        if (!pok) {
-                                errno = EINVAL;
-                                shlim(f, 0);
-                                return 0;
-                        }
-                        while (i--) shunget(f);
-                        return NAN;
-                }
-                return NAN;
-        }
-
-        if (i) {
-                shunget(f);
-                errno = EINVAL;
-                shlim(f, 0);
-                return 0;
-        }
-
-        if (c=='0') {
-                c = shgetc(f);
-                if ((c|32) == 'x')
-                        return hexfloat(f, bits, emin, sign, pok);
-                shunget(f);
-                c = '0';
-        }
-
-        return decfloat(f, c, bits, emin, sign, pok);
+long double __floatscan(FILE* f, int prec, int pok) {
+  int sign = 1;
+  size_t i;
+  int bits;
+  int emin;
+  int c;
+
+  switch (prec) {
+    case 0:
+      bits = FLT_MANT_DIG;
+      emin = FLT_MIN_EXP - bits;
+      break;
+    case 1:
+      bits = DBL_MANT_DIG;
+      emin = DBL_MIN_EXP - bits;
+      break;
+    case 2:
+      bits = LDBL_MANT_DIG;
+      emin = LDBL_MIN_EXP - bits;
+      break;
+    default:
+      return 0;
+  }
+
+  while (isspace((c = shgetc(f))))
+    ;
+
+  if (c == '+' || c == '-') {
+    sign -= 2 * (c == '-');
+    c = shgetc(f);
+  }
+
+  for (i = 0; i < 8 && (c | 32) == "infinity"[i]; i++)
+    if (i < 7)
+      c = shgetc(f);
+  if (i == 3 || i == 8 || (i > 3 && pok)) {
+    if (i != 8) {
+      shunget(f);
+      if (pok)
+        for (; i > 3; i--)
+          shunget(f);
+    }
+    return sign * INFINITY;
+  }
+  if (!i)
+    for (i = 0; i < 3 && (c | 32) == "nan"[i]; i++)
+      if (i < 2)
+        c = shgetc(f);
+  if (i == 3) {
+    if (shgetc(f) != '(') {
+      shunget(f);
+      return NAN;
+    }
+    for (i = 1;; i++) {
+      c = shgetc(f);
+      if (c - '0' < 10U || c - 'A' < 26U || c - 'a' < 26U || c == '_')
+        continue;
+      if (c == ')')
+        return NAN;
+      shunget(f);
+      if (!pok) {
+        errno = EINVAL;
+        shlim(f, 0);
+        return 0;
+      }
+      while (i--)
+        shunget(f);
+      return NAN;
+    }
+    return NAN;
+  }
+
+  if (i) {
+    shunget(f);
+    errno = EINVAL;
+    shlim(f, 0);
+    return 0;
+  }
+
+  if (c == '0') {
+    c = shgetc(f);
+    if ((c | 32) == 'x')
+      return hexfloat(f, bits, emin, sign, pok);
+    shunget(f);
+    c = '0';
+  }
+
+  return decfloat(f, c, bits, emin, sign, pok);
 }