VCL integer literals are (long) int

[nigoroll]

Working on #4422 I accidentally stepped on this:

set resp.http.number = 1234123 * 10000;

results in

**** v1    vsl|       1001 RespHeader      c number: -543671888

This is unexpected since VCL_INT is int64_t which, on my machine, has the same size as long long int, but the overflow is to be expected for long int:

(gdb) p 1234123L * 10000L
$1 = -543671888
(gdb) p 1234123LL * 10000LL
$2 = 12341230000
(gdb) p sizeof(long int)
$11 = 4
(gdb) p sizeof(long long int)
$12 = 8

[nigoroll]

Potential fix, but:

• Do we want INT64_C(%s%.0f) instead?
• I'd prefer to leave this with @bsdphk and @dridi

diff --git a/lib/libvcc/vcc_expr.c b/lib/libvcc/vcc_expr.c
index 4f1d41c95..090a7b5e5 100644
--- a/lib/libvcc/vcc_expr.c
+++ b/lib/libvcc/vcc_expr.c
@@ -747,7 +747,7 @@ vcc_number(struct vcc *tl, struct expr **e, vcc_type_t fmt, const char *sign)
                } else if (fmt == REAL || t->tok == FNUM) {
                        e1 = vcc_mk_expr(REAL, "%s%.3f", sign, t->num);
                } else {
-                       e1 = vcc_mk_expr(INT, "%s%.0f", sign, t->num);
+                       e1 = vcc_mk_expr(INT, "%s%.0fLL", sign, t->num);
                }
        }
        e1->constant = EXPR_CONST;