set errno properly when parsing floating point

diff --git a/src/internal/floatscan.c b/src/internal/floatscan.c
index 7d9a452..3875719 100644 (file)
--- a/src/internal/floatscan.c
+++ b/src/internal/floatscan.c
@@ -3,6 +3,7 @@
 #include <math.h>
 #include <float.h>
 #include <limits.h>
+#include <errno.h>
 
 #include "shgetc.h"
 #include "floatscan.h"
@@ -111,6 +112,7 @@ static long double decfloat(FILE *f, int bits, int emin, int sign, int pok)
                shunget(f);
        }
        if (!gotdig) {
+               errno = EINVAL;
                shlim(f, 0);
                return 0;
        }
@@ -119,10 +121,14 @@ static long double decfloat(FILE *f, int bits, int emin, int sign, int pok)
                return sign * 0.0;
        if (lrp==dc && (!k || (k==1 && !j)) && (bits>30 || x[0]>>bits==0))
                return sign * (long double)x[0];
-       if (lrp > -emin/2)
+       if (lrp > -emin/2) {
+               errno = ERANGE;
                return sign * LDBL_MAX * LDBL_MAX;
-       if (lrp < emin-2*LDBL_MANT_DIG)
+       }
+       if (lrp < emin-2*LDBL_MANT_DIG) {
+               errno = ERANGE;
                return sign * LDBL_MIN * LDBL_MIN;
+       }
 
        if (k<KMAX && j) {
                for (; j<9; j++) x[k]*=10;
@@ -257,6 +263,8 @@ static long double decfloat(FILE *f, int bits, int emin, int sign, int pok)
 
        y = scalbnl(y, e2);
 
+       if (!y) errno = ERANGE;
+
        return y;
 }
 
@@ -332,8 +340,14 @@ static long double hexfloat(FILE *f, int bits, int emin, int sign, int pok)
        e2 += 4*rp - 32;
 
        if (!x) return sign * 0.0;
-       if (e2 > -emin) return sign * LDBL_MAX * LDBL_MAX;
-       if (e2 < emin-2*LDBL_MANT_DIG) return sign * LDBL_MIN * LDBL_MIN;
+       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) {
@@ -359,6 +373,8 @@ static long double hexfloat(FILE *f, int bits, int emin, int sign, int pok)
        y = bias + sign*(long double)x + sign*y;
        y -= bias;
 
+       if (!y) errno = ERANGE;
+
        return scalbnl(y, e2);
 }
 
@@ -409,6 +425,7 @@ long double __floatscan(FILE *f, int c, int prec, int pok)
 
        if (i) {
                shunget(f);
+               errno = EINVAL;
                shlim(f, 0);
                return 0;
        }