第 2 章： 简单动态字符串

没有任何未使用空间的 SDS 示例。

digraph { label = "\n 图 2-1 SDS 示例"; rankdir = LR; node [shape = record]; // sdshdr [label = "sdshdr | free \n 0 | len \n 5 | <buf> buf"]; buf [label = "{ 'R' | 'e' | 'd' | 'i' | 's' | '\\0' }"]; // sdshdr:buf -> buf; }

带有五字节使用空间的 SDS 示例。

digraph { label = "\n 图 2-2 带有未使用空间的 SDS 示例"; rankdir = LR; node [shape = record]; // sdshdr [label = "sdshdr | free \n 5 | len \n 5 | <buf> buf"]; buf [label = "{ 'R' | 'e' | 'd' | 'i' | 's' | '\\0' | | | | | }"]; // sdshdr:buf -> buf; }

遍历 C 字符串并获取其长度的过程。

digraph { rankdir = TB; node [shape = record]; str [label = " <1> 'R' | <2> 'e' | <3> 'd' | <4> 'i' | <5> 's' | <6> '\\0' "]; node [shape = plaintext]; p1 [label = "len = 1"]; p1 -> str:1; }
digraph { rankdir = TB; node [shape = record]; str [label = " <1> 'R' | <2> 'e' | <3> 'd' | <4> 'i' | <5> 's' | <6> '\\0' "]; node [shape = plaintext]; p2 [label = "len = 2"]; p2 -> str:2; }
digraph { rankdir = TB; node [shape = record]; str [label = " <1> 'R' | <2> 'e' | <3> 'd' | <4> 'i' | <5> 's' | <6> '\\0' "]; node [shape = plaintext]; p3 [label = "len = 3"]; p3 -> str:3; }
digraph { rankdir = TB; node [shape = record]; str [label = " <1> 'R' | <2> 'e' | <3> 'd' | <4> 'i' | <5> 's' | <6> '\\0' "]; node [shape = plaintext]; p4 [label = "len = 4"]; p4 -> str:4; }
digraph { rankdir = TB; node [shape = record]; str [label = " <1> 'R' | <2> 'e' | <3> 'd' | <4> 'i' | <5> 's' | <6> '\\0' "]; node [shape = plaintext]; p5 [label = "len = 5"]; p5 -> str:5; }
digraph { label = "\n 图 2-4 计算 C 字符串长度的过程"; rankdir = TB; node [shape = record]; str [label = " <1> 'R' | <2> 'e' | <3> 'd' | <4> 'i' | <5> 's' | <6> '\\0' "]; node [shape = plaintext]; p6 [label = "发现空字符 \n 停止计数 \n 字符串的长度为 5 字节"]; p6 -> str:6; }