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本帖最后由 wangzhen11aaa 于 2011-10-06 15:17 编辑
下面是i18n_initalize() /*关于字符集的设置*/
107 static void
108 i18n_initialize (void)
109 {
110 /* ENABLE_NLS implies existence of functions invoked here. */
111 #ifdef ENABLE_NLS
112 /* Set the current locale. */
113 setlocale (LC_ALL, ""); /*系统调用设定LC_ALL为环境中的字符集*/
114 /* Set the text message domain. */
115 bindtextdomain ("wget", LOCALEDIR); /*linux i18n中每个资源文件都是.mo文件，LOCAL_PATH指定寻找.mo文件路径，此处是wget.mo路径在当前目录。因为LOCALEDIR是" "。
116 textdomain ("wget"); /*wget命令使用wget.mo*/
117 #endif /* ENABLE_NLS */
118 }
main( . . .)
{
. . . . . .
[code]
899 /* Construct the name of the executable, without the directory part. */
900 #ifdef __VMS
901 /* On VMS, lose the "dev:[dir]" prefix and the ".EXE;nnn" suffix. */ 902 exec_name = vms_basename (argv[0]); /*VMS是no-unix路径名.这里是做一些转化*/
903 #else /* def __VMS */
904 exec_name = strrchr (argv[0], PATH_SEPARATOR); /*找到wget的名字。/x/x/wget运行shell命令时，此就是取wget，或者直接取wget因为那是链接文件，没关系，仍然运行了wget并且取到了名字wget*/
905 if (!exec_name)
906 exec_name = argv[0];
907 else
908 ++exec_name;
909 #endif /* def __VMS [else] */
910
911 #ifdef WINDOWS /*如果是Windows环境*/
912 /* Drop extension (typically .EXE) from executable filename. */
913 windows_main ((char **) &exec_name); /*可执行文件中有suffix.exe。要去掉1、____________-------->/mswindows.c*/
914 #endif
915
916 /* Load the hard-coded defaults. */
917 defaults (); /3、________--------->*src/init.c*/
918
919 init_switches (); /*4________------>main.c这是初始化options wget - x*/
1、_______-------->
77 windows_main (char **exec_name)
78 {
79 char *p;
80
81 /* Remove .EXE from filename if it has one. */
82 *exec_name = xstrdup (*exec_name); 2、_______------>这里分配名字空间来处理。lib/ xmalloc.c*/
83 p = strrchr (*exec_name, '.'); /*这里是真正去掉了.exe*/
84 if (p)
85 *p = '\0'; /*此步将字符串去掉了.exe*/
86 }
2、__________------------->
120 char *
121 xstrdup (char const *string)
122 {
123 return xmemdup (string, strlen (string) + 1);
124 }
112 void *
113 xmemdup (void const *p, size_t s)
114 {
115 return memcpy (xmalloc (s), p, s);
116 }
3、_____------------>
/*初始化很多默认的参数*/
296 void
297 defaults (void)
298 {
299 char *tmp;
300
301 /* Most of the default values are 0 (and 0.0, NULL, and false).
302 Just reset everything, and fill in the non-zero values. Note
303 that initializing pointers to NULL this way is technically
304 illegal, but porting Wget to a machine where NULL is not all-zero
305 bit pattern will be the least of the implementors' worries. */
306 xzero (opt);
307
308 opt.cookies = true;
309 opt.verbose = -1;
310 opt.ntry = 20;
311 opt.reclevel = 5;
312 opt.add_hostdir = true;
313 opt.netrc = true;
314 opt.ftp_glob = true;
315 opt.htmlify = true;
316 opt.http_keep_alive = true;
317 opt.use_proxy = true;
318 tmp = getenv ("no_proxy");
319 if (tmp)
320 opt.no_proxy = sepstring (tmp);
321 opt.prefer_family = prefer_none;
322 opt.allow_cache = true;
323
324 opt.read_timeout = 900;
325 opt.use_robots = true;
326
327 opt.remove_listing = true;
328
329 opt.dot_bytes = 1024;
330 opt.dot_spacing = 10;
331 opt.dots_in_line = 50;
332
333 opt.dns_cache = true;
334 opt.ftp_pasv = true;
335
336 #ifdef HAVE_SSL
337 opt.check_cert = true;
338 #endif
339
340 /* The default for file name restriction defaults to the OS type. */
341 #if defined(WINDOWS) || defined(MSDOS) || defined(__CYGWIN__)
342 opt.restrict_files_os = restrict_windows;
343 #else
344 opt.restrict_files_os = restrict_unix;
345 #endif
346 opt.restrict_files_ctrl = true;
347 opt.restrict_files_nonascii = false;
348 opt.restrict_files_case = restrict_no_case_restriction;
349
350 opt.max_redirect = 20;
351
352 opt.waitretry = 10;
353
354 #ifdef ENABLE_IRI
355 opt.enable_iri = true;
356 #else
357 opt.enable_iri = false;
358 #endif
359 opt.locale = NULL;
360 opt.encoding_remote = NULL;
361
362 opt.useservertimestamps = true;
363 opt.show_all_dns_entries = false;
364 }
4_________---------->
/*这里是根据给定的option_data[]来初始化，或者说是注册入某些数组。以后对于输入的各种选项来作返回，并且比较*/
331 static void
332 init_switches (void)
333 {
334 char *p = short_options;
335 size_t i, o = 0;
336 for (i = 0; i < countof (option_data); i++) /*+++===?*/
337 {
338 struct cmdline_option *opt = &option_data;
339 struct option *longopt;
340
341 if (!opt->long_name)
342
343 continue;
344
345 longopt = &long_options[o++]; /*长选项存放在long_options[]数组中*/
346 longopt->name = opt->long_name;
347 longopt->val = i;
348 if (opt->short_name) /
349 {
350 *p++ = opt->short_name; /*短选项放在short_options[]数组中*/
351 optmap[opt->short_name - 32] = longopt - long_options;/*这个数组来存放对应的短选项的长选项的数组的索引*/
352 }
353 switch (opt->type) /*由于opt是cmd_line结构，所以本来type就是被赋值的*/
354 {
355 case OPT_VALUE: /*参数类型*/
356 longopt->has_arg = required_argument;
357 if (opt->short_name)
358 *p++ = ':'; /*将' : '存入short_options[]数组中对应的选项*/
359 break;
. .. . . .. .
/*option_data的初始化表*/
157 static struct cmdline_option option_data[] =
158 {
159 { "accept", 'A', OPT_VALUE, "accept", -1 },
160 { "adjust-extension", 'E', OPT_BOOLEAN, "adjustextension", -1 },
161 { "append-output", 'a', OPT__APPEND_OUTPUT, NULL, required_argument },
162 { "ask-password", 0, OPT_BOOLEAN, "askpassword", -1 },
163 { "auth-no-challenge", 0, OPT_BOOLEAN, "authnochallenge", -1 },
164 { "background", 'b', OPT_BOOLEAN, "background", -1 },
165 { "backup-converted", 'K', OPT_BOOLEAN, "backupconverted", -1 },
166 { "backups", 0, OPT_BOOLEAN, "backups", -1 },
167 { "base", 'B', OPT_VALUE, "base", -1 },
168 { "bind-address", 0, OPT_VALUE, "bindaddress", -1 },
169 { IF_SSL ("ca-certificate"), 0, OPT_VALUE, "cacertificate", -1 },
170 { IF_SSL ("ca-directory"), 0, OPT_VALUE, "cadirectory", -1 },
. .. . . . .
}
/*cmdline_option 的格式*/
137 struct cmdline_option {
138 const char *long_name;
139 char short_name;
140 enum {
141 OPT_VALUE,
142 OPT_BOOLEAN,
143 OPT_FUNCALL,
144 /* Non-standard options that have to be handled specially in
145 main(). */
146 OPT__APPEND_OUTPUT,
147 OPT__CLOBBER,
148 OPT__DONT_REMOVE_LISTING,
149 OPT__EXECUTE,
150 OPT__NO,
151 OPT__PARENT
152 } type;
153 const void *data; /* for standard options */
154 int argtype; /* for non-standard options */
155 }; |
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楼主: duanjigang
发表于 2011-10-03 22:59
发表于 2011-10-04 20:50
