add ubuntu to chsrc.c ,add ubuntu to source_info.h,add xy_strch to helper.h to take place of some characters

chsrc.c

@@ -76,6 +76,40 @@ pl_ruby_chsrc (char* option)
   puts(xy_strjoin("chsrc: 感谢镜像提供方：", source_name));
 }
 
+void 
+pl_ubuntu_chsrc (char* option)
+{
+  int selected = 0;
+  for (int i=0;i<sizeof(pl_ruby_sources);i++) {
+    // 循环测速
+  }
+  const char* source_name = pl_ubuntu_sources[selected].mirror->name;
+  const char* source_abbr = pl_ubuntu_sources[selected].mirror->abbr;
+  const char* source_url  = pl_ubuntu_sources[selected].url;
+// #ifdef BEIFEN
+  char* beifen = "cp -rf /etc/apt/sources.list /etc/apt/sources.list.bak";
+  system(beifen);
+  free(beifen);
+  puts("备份文件名: /etc/apt/sources.list.bak");
+// #endif
+  const char* current_url = xy_strch(source_url,"/","\\/");
+
+  char* cmd = xy_strjoin(xy_strjoin("sed -E \'s/(^[^#]* .*)http[:|\\.|\\/|a-z|A-Z]*\\/ubuntu\\//\\1",current_url),"\\//\'< /etc/apt/sources.list.bak | cat > /etc/apt/sources.list");
+
+  system(cmd);
+  free(cmd);
+
+#ifndef BEIFEN
+  char* rm = "rm -rf /etc/apt/source.list.bak";
+  system(rm);
+  free(rm);  
+#endif
+
+
+  puts("chsrc: 为'ubuntu'命令换源");
+  puts(xy_strjoin("chsrc: 感谢镜像提供方：", source_name));
+}
+
 #define cmdfunc(func) (const char const*)func
 static const char const
 *pl_ruby[]   = {"gem",  "ruby",    "rb",       NULL,  cmdfunc(pl_ruby_chsrc)},

chsrc.h

@@ -24,7 +24,10 @@ mirror_info
   Bfsu          = {"BFSU",     "北京外国语大学开源软件镜像站"},
   Pku           = {"PKU",      "北京大学开源镜像站"},
   Bjtu          = {"BJTU",     "北京交通大学自由与开源软件镜像站"},
-  Sustech       = {"SUSTech",  "南方科技大学开源软件镜像站"};
+  Sustech       = {"SUSTech",  "南方科技大学开源软件镜像站"},
+  Ustc          = {"USTC",     "中国科学技术大学开源镜像站"},
+  Wy            = {"WY",       "网易开源镜像站"},
+  Sohu          = {"SOHU",     "搜狐开源镜像站"};
 
 // 大型公司
 mirror_info
@@ -50,3 +53,14 @@ pl_ruby_sources[] = {
   {&Tencent,   "https://mirrors.tencent.com/rubygems/"},
   {&RubyChina, "https://gems.ruby-china.com"},
 };
+
+static source_info
+pl_ubuntu_sources[] = {
+  {&Bfsu,      "https://mirrors.bfsu.edu.cn/ubuntu/"},
+  {&Ustc,      "https://mirrors.ustc.edu.cn/ubuntu/"},
+  {&Ali,       "https://mirrors.aliyun.com/ubuntu/"},
+  {&Tuna,      "https://mirrors.tuna.tsinghua.edu.cn/ubuntu/"},
+  {&Tencent,   "https://mirrors.tencent.com/ubuntu/"},
+  {&Wy,        "https://mirrors.163.com/ubuntu/"},
+  {&Sohu,      "https://mirrors.sohu.com/ubuntu/"},
+};

helper.h

@@ -43,6 +43,33 @@ xy_strjoin (const char* str1, const char* str2)
 }
 
 
+//有一个BUG，每一次替换都会加长到最大长度
+static char*
+xy_strch (const char* str, const char src,const char* dest)
+{
+  size_t str_len  = strlen(str);
+  size_t dest_len  = strlen(dest);
+  size_t size = str_len*dest_len;
+  char* ret  = (char*)malloc(size);
+  int i=0;
+  int j=0;
+  while(i<str_len) {
+    if(str[i]==src) {
+      int k=0;
+      while(k<dest_len){
+        ret[j++] = dest[k++];
+      }
+      i++;
+    }
+    else {
+      ret[j++] = str[i++];
+    }
+  }
+  ret[j] = 0;
+  return ret;
+}
+
+
 static void
 xy_success (const char* str1)
 {