fix overread (consuming an extra byte) scanning NAN

[musl] / src / internal / floatscan.c

diff --git a/src/internal/floatscan.c b/src/internal/floatscan.c
index da209e2..b260381 100644 (file)
--- a/src/internal/floatscan.c
+++ b/src/internal/floatscan.c
@@ -44,7 +44,7 @@ static long long scanexp(FILE *f, int pok)
        }
        for (x=0; c-'0'<10U && x<INT_MAX/10; c = shgetc(f))
                x = 10*x + c-'0';
-       for (y=x; c-'0'<10U && x<LLONG_MAX/100; c = shgetc(f))
+       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);
@@ -394,12 +394,13 @@ static long double hexfloat(FILE *f, int bits, int emin, int sign, int pok)
        return scalbnl(y, e2);
 }
 
-long double __floatscan(FILE *f, int c, int prec, int pok)
+long double __floatscan(FILE *f, int prec, int pok)
 {
        int sign = 1;
        int i;
        int bits;
        int emin;
+       int c;
 
        switch (prec) {
        case 0:
@@ -418,7 +419,7 @@ long double __floatscan(FILE *f, int c, int prec, int pok)
                return 0;
        }
 
-       if (c<0) c = shgetc(f);
+       while (isspace((c=shgetc(f))));
 
        if (c=='+' || c=='-') {
                sign -= 2*(c=='-');
@@ -435,7 +436,7 @@ long double __floatscan(FILE *f, int c, int prec, int pok)
                return sign * INFINITY;
        }
        if (!i) for (i=0; i<3 && (c|32)=="nan"[i]; i++)
-               if (i<3) c = shgetc(f);
+               if (i<2) c = shgetc(f);
        if (i==3) {
                return NAN;
        }