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*sprintf now returns write count without buffer

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This commit is contained in:
Max Wash
2020-07-24 10:50:23 +01:00
parent 17ce639206
commit 04ee711f31
1 changed files with 9 additions and 2 deletions
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11
photon/libc/stdio/vsnprintf.c
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@@ -11,8 +11,10 @@ static void _out_buf(struct __printf_backend *bk, char ch)
{
struct __vsnprintf_arg *arg = bk->arg;
if (arg->idx < arg->max) {
arg->buf[arg->idx++] = ch;
arg->buf[arg->idx] = ch;
}
arg->idx++;
}
int vsnprintf(char *buf, size_t sz, const char *restrict format, va_list arg)
@@ -25,5 +27,10 @@ int vsnprintf(char *buf, size_t sz, const char *restrict format, va_list arg)
bk.out = _out_buf;
bk.arg = &bk_arg;
return __xprintf(&bk, format, arg);
__xprintf(&bk, format, arg);
if (!bk_arg.idx) {
return 0;
}
return bk_arg.idx - 1;
}