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fix undefined behavior in wcsto[ld] family functions

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analogous to commit b287cd745c2243f8e5114331763a5a9813b5f6ee but for
the custom FILE stream type the wcstol and wcstod family use. __toread
could be used here as well, but there's a simple direct fix to make
the buffer pointers initially valid for subtraction, so just do that
to avoid pulling in stdio exit code in programs that don't use stdio.
This commit is contained in:
Rich Felker 2020-04-24 10:35:01 -04:00
parent 043c6e31d9
commit f3ecdc1043
2 changed files with 2 additions and 4 deletions
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3
src/stdlib/wcstod.c
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@ -33,8 +33,7 @@ static long double wcstox(const wchar_t *s, wchar_t **p, int prec)
unsigned char buf[64];
FILE f = {0};
f.flags = 0;
f.rpos = f.rend = 0;
f.buf = buf + 4;
f.rpos = f.rend = f.buf = buf + 4;
f.buf_size = sizeof buf - 4;
f.lock = -1;
f.read = do_read;

3
src/stdlib/wcstol.c
View File

@ -35,8 +35,7 @@ static unsigned long long wcstox(const wchar_t *s, wchar_t **p, int base, unsign
unsigned char buf[64];
FILE f = {0};
f.flags = 0;
f.rpos = f.rend = 0;
f.buf = buf + 4;
f.rpos = f.rend = f.buf = buf + 4;
f.buf_size = sizeof buf - 4;
f.lock = -1;
f.read = do_read;