regedit.c

ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

/*
 * Windows regedit.exe registry editor implementation.
 *
 * Copyright 2002 Andriy Palamarchuk
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <regedit.h>


static const char *usage =
    "Usage:\n"
    "    regedit filename\n"
    "    regedit /E filename [regpath]\n"
    "    regedit /D regpath\n"
    "\n"
    "filename - registry file name\n"
    "regpath - name of the registry key\n"
    "\n"
    "When is called without any switches adds contents of the specified\n"
    "registry file to the registry\n"
    "\n"
    "Switches:\n"
    "    /E - exports contents of the specified registry key to the specified\n"
    "	file. Exports the whole registry if no key is specified.\n"
    "    /D - deletes specified registry key\n"
    "    /S - silent execution, can be used with any other switch.\n"
    "	The only existing mode, exists for compatibility with Windows regedit.\n"
    "    /V - advanced mode, can be used with any other switch.\n"
    "	Ignored, exists for compatibility with Windows regedit.\n"
    "    /L - location of system.dat file. Can be used with any other switch.\n"
    "	Ignored. Exists for compatibility with Windows regedit.\n"
    "    /R - location of user.dat file. Can be used with any other switch.\n"
    "	Ignored. Exists for compatibility with Windows regedit.\n"
    "    /? - print this help. Any other switches are ignored.\n"
    "    /C - create registry from. Not implemented.\n"
    "\n"
    "The switches are case-insensitive, can be prefixed either by '-' or '/'.\n"
    "This program is command-line compatible with Microsoft Windows\n"
    "regedit.\n";

typedef enum {
    ACTION_UNDEF, ACTION_ADD, ACTION_EXPORT, ACTION_DELETE
} REGEDIT_ACTION;

BOOL PerformRegAction(REGEDIT_ACTION action, LPSTR s);

/**
 * Process unknown switch.
 *
 * Params:
 *   chu - the switch character in upper-case.
 *   s - the command line string where s points to the switch character.
 */
static void error_unknown_switch(char chu, char *s)
{
    if (isalpha(chu)) {
        fprintf(stderr,"%s: Undefined switch /%c!\n", getAppName(), chu);
    } else {
        fprintf(stderr,"%s: Alphabetic character is expected after '%c' "
                "in swit ch specification\n", getAppName(), *(s - 1));
    }
    exit(1);
}

BOOL ProcessCmdLine(LPSTR lpCmdLine)
{
    REGEDIT_ACTION action = ACTION_UNDEF;
    LPSTR s = lpCmdLine;        /* command line pointer */
    CHAR ch = *s;               /* current character */

    setAppName("regedit");
    while (ch && ((ch == '-') || (ch == '/'))) {
        char chu;
        char ch2;

        s++;
        ch = *s;
        ch2 = *(s+1);
        chu = (CHAR) toupper(ch);
        if (!ch2 || isspace(ch2)) {
            if (chu == 'S' || chu == 'V') {
                /* ignore these switches */
            } else {
                switch (chu) {
                case 'D':
                    action = ACTION_DELETE;
                    break;
                case 'E':
                    action = ACTION_EXPORT;
                    break;
                case '?':
                    fprintf(stderr,usage);
                    exit(0);
                    break;
                default:
                    error_unknown_switch(chu, s);
                    break;
                }
            }
            s++;
        } else {
            if (ch2 == ':') {
                switch (chu) {
                case 'L':
                    /* fall through */
                case 'R':
                    s += 2;
                    while (*s && !isspace(*s)) {
                        s++;
                    }
                    break;
                default:
                    error_unknown_switch(chu, s);
                    break;
                }
            } else {
                /* this is a file name, starting from '/' */
                s--;
                break;
            }
        }
        /* skip spaces to the next parameter */
        ch = *s;
        while (ch && isspace(ch)) {
            s++;
            ch = *s;
        }
    }

    if (*s && action == ACTION_UNDEF)
        action = ACTION_ADD;

    if (action == ACTION_UNDEF)
        return FALSE;

    return PerformRegAction(action, s);
}

BOOL PerformRegAction(REGEDIT_ACTION action, LPSTR s)
{
    switch (action) {
    case ACTION_ADD: {
            CHAR filename[MAX_PATH];
            FILE *reg_file;

            get_file_name(&s, filename);
            if (!filename[0]) {
                fprintf(stderr,"%s: No file name is specified\n", getAppName());
                fprintf(stderr,usage);
                exit(1);
            }

            while(filename[0]) {
                reg_file = fopen(filename, "r");
                if (reg_file) {
                    processRegLines(reg_file, doSetValue);
                } else {
                    perror("");
                    fprintf(stderr,"%s: Can't open file \"%s\"\n", getAppName(), filename);
                    exit(1);
                }
                get_file_name(&s, filename);
            }
            break;
        }
    case ACTION_DELETE: {
            CHAR reg_key_name[KEY_MAX_LEN];

            get_file_name(&s, reg_key_name);
            if (!reg_key_name[0]) {
                fprintf(stderr,"%s: No registry key is specified for removal\n",
                        getAppName());
                fprintf(stderr,usage);
                exit(1);
            }
            delete_registry_key(reg_key_name);
            break;
        }
    case ACTION_EXPORT: {
            CHAR filename[MAX_PATH];
            LPCTSTR pszFilename;
#ifdef UNICODE
            WCHAR filename_wide[MAX_PATH];
#endif

            filename[0] = '\0';
            get_file_name(&s, filename);
            if (!filename[0]) {
                fprintf(stderr,"%s: No file name is specified\n", getAppName());
                fprintf(stderr,usage);
                exit(1);
            }

#ifdef UNICODE
            MultiByteToWideChar(CP_ACP, 0, filename, -1, filename_wide,
                sizeof(filename_wide) / sizeof(filename_wide[0]));
            pszFilename = filename_wide;
#else
            pszFilename = filename;
#endif

            if (s[0]) {
                CHAR reg_key_name[KEY_MAX_LEN];

                get_file_name(&s, reg_key_name);
                export_registry_key(pszFilename, reg_key_name);
            } else {
                export_registry_key(pszFilename, NULL);
            }
            break;
        }
    default:
        fprintf(stderr,"%s: Unhandled action!\n", getAppName());
        exit(1);
        break;
    }
    return TRUE;
}