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-rw-r--r--src/internal/floatscan.c25
1 files changed, 21 insertions, 4 deletions
diff --git a/src/internal/floatscan.c b/src/internal/floatscan.c
index 7d9a4524..3875719b 100644
--- 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;
}