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Fix memcpy(size=0) ubsan warning in vsnprintf()

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Fixes #785
This commit is contained in:
Justine Tunney 2023-03-29 01:23:59 -07:00
parent 7f925e6be9
commit 999481ace0
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GPG key ID: BE714B4575D6E328
2 changed files with 15 additions and 7 deletions
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16
libc/fmt/vsnprintf.c
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@ -30,14 +30,16 @@ struct SprintfStr {
};
static int vsnprintfputchar(const char *s, struct SprintfStr *t, size_t n) {
if (n == 1 && t->i < t->n) {
t->p[t->i] = s[0];
} else if (t->i + n <= t->n) {
memcpy(t->p + t->i, s, n);
} else if (t->i < t->n) {
memcpy(t->p + t->i, s, t->n - t->i);
if (n) {
if (n == 1 && t->i < t->n) {
t->p[t->i] = s[0];
} else if (t->i + n <= t->n) {
memcpy(t->p + t->i, s, n);
} else if (t->i < t->n) {
memcpy(t->p + t->i, s, t->n - t->i);
}
t->i += n;
}
t->i += n;
return 0;
}