strings: fix write_decimal() for min_i64 (#25638)

tankf33der · web-flow · commit ecd7094d4fa3 · 2025-10-31T20:24:59.000+02:00
diff --git a/vlib/strings/builder.c.v b/vlib/strings/builder.c.v
@@ -81,7 +81,7 @@ pub fn (mut b Builder) write_decimal(n i64) {
 		return
 	}
 	mut buf := [25]u8{}
-	mut x := if n < 0 { -n } else { n }
+	mut x := if n < 0 { u64(-n) } else { u64(n) }
 	mut i := 24
 	for x != 0 {
 		nextx := x / 10
diff --git a/vlib/strings/builder_test.v b/vlib/strings/builder_test.v
@@ -165,6 +165,7 @@ fn test_write_decimal() {
 	assert sb_i64_str(-1234567890) == '-1234567890'
 	assert sb_i64_str(9223372036854775807) == '9223372036854775807'
 	assert sb_i64_str(-9223372036854775807) == '-9223372036854775807'
+	assert sb_i64_str(min_i64) == '-9223372036854775808'
 }
 
 fn test_grow_len() {

Original file line number	Diff line number	Diff line change
`@@ -81,7 +81,7 @@ pub fn (mut b Builder) write_decimal(n i64) {`
`81`	`81`	`return`
`82`	`82`	`}`
`83`	`83`	`mut buf := [25]u8{}`
`84`		`- mut x := if n < 0 { -n } else { n }`
	`84`	`+ mut x := if n < 0 { u64(-n) } else { u64(n) }`
`85`	`85`	`mut i := 24`
`86`	`86`	`for x != 0 {`
`87`	`87`	`nextx := x / 10`