36 lines
994 B
Plaintext
36 lines
994 B
Plaintext
/* ===== 模块6：函数 =====
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* test13_extern — 外部 VM 函数与字符串
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* 难度：2/5
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* 验证点：#[extern("vm")] 声明、vm_printf 调用、
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* 字符串字面量、字符串参数传递
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*/
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#[extern("vm")] fn vm_printf(fmt: *u8, ...) void;
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#[extern("vm")] fn vm_strlen(s: *i8) i32;
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#[extern("vm")] fn vm_strcmp(a: *i8, b: *i8) i32;
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fn main() i32 {
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/* vm_printf 输出测试 */
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vm_printf("hello spl\n");
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vm_printf("%d %d %d\n", 1, 2, 3);
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vm_printf("chars: %c%c\n", 'A', 'B');
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/* 字符串字面量用于 extern */
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var len := vm_strlen("hello");
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if len != 5 { ret 1; }
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/* 字符串比较 */
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var cmp := vm_strcmp("abc", "abc");
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if cmp != 0 { ret 2; }
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var cmp2 := vm_strcmp("abc", "def");
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if cmp2 == 0 { ret 3; }
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/* 字符串作为格式化参数 */
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vm_printf("string test: %s %s\n", "foo", "bar");
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/* vm_printf 返回 void（不关心返回值）*/
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vm_printf("all extern tests done\n");
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ret 0;
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}
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