将Unix移植到Windows - 使用pwd.h

Question

我正在尝试使用MinGW 编译libUnihan代码,但是遇到了需要移植的函数.该函数的目的是获得规范路径表示.它使用pwd.h(这是POSIX,而MinGW不是)因此它可以通过检索passwd包含的结构来解释使用'〜'来表示主目录pw_dir.我发现一些信息在这里,和一个端口realpath 在这里,但我仍然完全处于亏损至于如何处理这个.使用MinGW,我仍然有一个主页目录,~并且位于/home/nate,但由于它不是POSIX,我不必pwd.h帮我找到这个主目录的位置.

问:如何将下面的功能移植到MinGW上？

/**
 * Return the canonicalized absolute pathname.
 *
 * It works exactly the same with realpath(3), except this function can handle the path with ~,
 * where realpath cannot.
 *
 * @param path The path to be resolved.
 * @param resolved_path Buffer for holding the resolved_path.
 * @return resolved path, NULL is the resolution is not sucessful.
 */
gchar*
truepath(const gchar *path, gchar *resolved_path){
    gchar workingPath[PATH_MAX];
    gchar fullPath[PATH_MAX];
    gchar *result=NULL;
    g_strlcpy(workingPath,path,PATH_MAX);

//     printf("*** path=%s \n",path);

    if ( workingPath[0] != '~' ){
        result = realpath(workingPath, resolved_path);
    }else{
        gchar *firstSlash, *suffix, *homeDirStr;
        struct passwd *pw;

        // initialize variables
        firstSlash = suffix = homeDirStr = NULL;

    firstSlash = strchr(workingPath, DIRECTORY_SEPARATOR);
        if (firstSlash == NULL)
            suffix = "";
        else
        {
            *firstSlash = 0;    // so userName is null terminated
            suffix = firstSlash + 1;
        }

        if (workingPath[1] == '\0')
            pw = getpwuid( getuid() );
        else
            pw = getpwnam( &workingPath[1] );

        if (pw != NULL)
            homeDirStr = pw->pw_dir;

        if (homeDirStr != NULL){
        gint ret=g_sprintf(fullPath, "%s%c%s", homeDirStr, DIRECTORY_SEPARATOR, suffix);
        if (ret>0){
        result = realpath(fullPath, resolved_path);
        }

    }
    }
    return result;
}

Answer 1

目的是实现~[username]/重映射逻辑.这种代码在Linux/UNIX环境中很有意义,但最常见的用途是引用用户自己的主目录.

为了方便起见,我只是添加对常见情况的支持~/- 即当前用户,而不是支持更一般的情况 - 在这种情况下它会失败并出现明显的错误.

获取当前用户主目录的功能是SHGetFolderPath.

#include <windows.h>

char homeDirStr[MAX_PATH];
if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_PERSONAL, NULL, 0, homeDirStr))) {
    // Do something with the path
} else {
    // Do something else
}

如果用户查找失败,您粘贴的代码不会尝试替换该字符串,而只是返回NULL,因此您可以模拟它.