io.snprintf

src/std/net.zr

@@ -174,6 +174,7 @@ func net.resolve[domain: str] : i64, bool
     // TODO: this probably shouldnt be hardcoded
     ~s, ok := net.create_udp_client(net.pack_addr(1, 1, 1, 1), 53)
     if !ok
+        Blob.free(query)
         return -1, false
 
     net.udp_send_to(s, s->addr, query->data, query->size)

src/std/std.zr

@@ -283,6 +283,67 @@ func io.printf[..] : void
             io.print_char(s[0])
         s = s + 1
 
+func io.snprintf[..] : i64
+    buf := _var_arg(0) as ptr
+    size := _var_arg(1) as i64
+    if size <= 0
+        return 0
+    s := _var_arg(2) as ptr
+    i := 3
+    n := 0
+
+    while s[0]
+        if s[0] == '%'
+            s = s + 1
+
+            if s[0] == 'd'
+                tmp := _stackalloc(21)
+                str.from_i64_buf(tmp, _var_arg(i) as i64)
+                tmp_len := str.len(tmp as str)
+                remaining := size - n - 1
+                mem.copy(tmp, buf + n, math.min(tmp_len, remaining))
+                n = n + tmp_len
+                i = i + 1
+            else if s[0] == 'x'
+                tmp := _stackalloc(17)
+                str.hex_from_i64_buf(tmp, _var_arg(i) as i64)
+                tmp_len := str.len(tmp as str)
+                remaining := size - n - 1
+                mem.copy(tmp, buf + n, math.min(tmp_len, remaining))
+                n = n + tmp_len
+                i = i + 1
+            else if s[0] == 's'
+                tmp_str := _var_arg(i) as str
+                tmp_len := str.len(tmp_str)
+                remaining := size - n - 1
+                mem.copy(tmp_str as ptr, buf + n, math.min(tmp_len, remaining))
+                n = n + tmp_len
+                i = i + 1
+            else if s[0] == 'c'
+                if n < size - 1
+                    buf[n] = _var_arg(i) as u8
+                n = n + 1
+                i = i + 1
+            else if s[0] == '%'
+                if n < size - 1
+                    buf[n] = '%'
+                n = n + 1
+            else if s[0] == 0
+                break
+            else
+                panic("io.snprintf: unrecognized format")
+        else
+            if n < size - 1
+                buf[n] = s[0]
+            n = n + 1
+        s = s + 1
+
+    if n < size
+        buf[n] = 0
+    else if size > 0
+        buf[size - 1] = 0
+    return n
+
 func io.print_sized[x: ptr, size: i64] : void
     _builtin_syscall(SYS_write, 1, x, size)