RepoMirrors
/
musl
mirror of git://git.musl-libc.org/musl
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

fix various bugs in strtold: 

0e10000000000000000000000000000000 was setting ERANGE

exponent char e/p was considered part of the match even if not
followed by a valid decimal value

"1e +10" was parsed as "1e+10"

hex digits were misinterpreted as 0..5 instead of 10..15
This commit is contained in:
Rich Felker 2011-04-03 18:44:37 -04:00
parent c68b26369e
commit e898a79053
1 changed files with 13 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
src/stdlib/strtold.c
View File

@ -2,6 +2,11 @@
#include <errno.h>
#include <ctype.h>
static int valid_exp(const unsigned char *s)
{
return isdigit(*s) || ((s[0]=='+'||s[0]=='-') && isdigit(s[1]));
}
long double strtold(const char *s1, char **p)
{
const unsigned char *s = (void *)s1;
@ -11,6 +16,7 @@ long double strtold(const char *s1, char **p)
int nonzero = 0;
int radix = '.';
long e;
int saved_errno = errno;
if (!p) p = (char **)&s1;
@ -41,26 +47,23 @@ long double strtold(const char *s1, char **p)
/* We have a real hex float */
s += 2;
for (; isxdigit(*s); s++) {
x = 16*x + (isdigit(*s)?*s-'0':(*s|32)-'a');
x = 16*x + (isdigit(*s)?*s-'0':(*s|32)-'a'+10);
if (*s!='0') nonzero=1;
}
if (*s == radix) {
frac = 1.0/16.0;
for (s++; isxdigit(*s); s++) {
x += frac * (isdigit(*s)?*s-'0':(*s|32)-'a');
x += frac * (isdigit(*s)?*s-'0':(*s|32)-'a'+10);
frac *= 1.0/16.0;
if (*s!='0') nonzero=1;
}
}
if ((*s|32) == 'p') {
if ((*s|32) == 'p' && valid_exp(s+1)) {
e = strtol((void *)(s+1), (void *)&s, 10);
for (; e>0; e--) x *= 2.0;
for (; e<0; e++) x *= 0.5;
}
if ((nonzero && !x) || !(1.0/x))
errno = ERANGE;
*p = (char *)s;
return sign ? -x : x;
goto finish;
}
/* Mantissa must be non-degenerate */
@ -81,13 +84,13 @@ long double strtold(const char *s1, char **p)
if (*s!='0') nonzero=1;
}
}
if ((*s|32)=='e') {
if ((*s|32)=='e' && valid_exp(s+1)) {
e = strtol((void *)++s, (void *)&s, 10);
for (; e>0; e--) x *= 10.0;
for (; e<0; e++) x /= 10.0;
}
if ((nonzero && !x) || !(1.0/x))
errno = ERANGE;
finish:
errno = ((nonzero && !x) || !(1.0/x)) ? ERANGE : saved_errno;
*p = (char*)s;
return sign ? -x : x;
}