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info.c

/*
 * Wine debugger utility routines
 *
 * Copyright 1993 Eric Youngdale
 * Copyright 1995 Alexandre Julliard
 *
 * 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 "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>

#include "debugger.h"
#include "wingdi.h"
#include "winuser.h"
#include "tlhelp32.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(winedbg);

/***********************************************************************
 *           print_help
 *
 * Implementation of the 'help' command.
 */
void print_help(void)
{
    int i = 0;
    static const char * const helptext[] =
        {
            "The commands accepted by the Wine debugger are a reasonable",
            "subset of the commands that gdb accepts.",
            "The commands currently are:",
            "  help                                   quit",
            "  break [*<addr>]                        watch *<addr>",
            "  delete break bpnum                     disable bpnum",
            "  enable bpnum                           condition <bpnum> [<expr>]",
            "  finish                                 cont [N]",
            "  step [N]                               next [N]",
            "  stepi [N]                              nexti [N]",
            "  x <addr>                               print <expr>",
            "  display <expr>                         undisplay <disnum>",
            "  local display <expr>                   delete display <disnum>",                  
            "  enable display <disnum>                disable display <disnum>",
            "  bt [<tid>|all]                         frame <n>",
            "  up                                     down",
            "  list <lines>                           disassemble [<addr>][,<addr>]",
            "  show dir                               dir <path>",
            "  set <reg> = <expr>                     set *<addr> = <expr>",
            "  mode [16,32,vm86]                      pass",
            "  whatis                                 info (see 'help info' for options)",

            "The 'x' command accepts repeat counts and formats (including 'i') in the",
            "same way that gdb does.\n",

            "The following are examples of legal expressions:",
            " $eax     $eax+0x3   0x1000   ($eip + 256)  *$eax   *($esp + 3)",
            " Also, a nm format symbol table can be read from a file using the",
            " symbolfile command.", /*  Symbols can also be defined individually with",
                                        " the define command.", */
            "",
            NULL
        };

    while (helptext[i]) dbg_printf("%s\n", helptext[i++]);
}


/***********************************************************************
 *           info_help
 *
 * Implementation of the 'help info' command.
 */
void info_help(void)
{
    int i = 0;
    static const char * const infotext[] =
        {
            "The info commands allow you to get assorted bits of interesting stuff",
            "to be displayed.  The options are:",
            "  info break           Displays information about breakpoints",
            "  info class <name>    Displays information about window class <name>",
            "  info display         Shows auto-display expressions in use",
            "  info except <pid>    Shows exception handler chain (in a given process)",
            "  info locals          Displays values of all local vars for current frame",
            "  info maps <pid>      Shows virtual mappings (in a given process)",
            "  info process         Shows all running processes",
            "  info reg             Displays values in all registers at top of stack",
            "  info segments <pid>  Displays information about all known segments",
            "  info share           Displays all loaded modules",
            "  info share <addr>    Displays internal module state",
            "  info stack           Dumps information about top of stack",
            "  info symbol <sym>    Displays information about a given symbol",
            "  info thread          Shows all running threads",
            "  info wnd <handle>    Displays internal window state",
            "",
            NULL
        };

    while (infotext[i]) dbg_printf("%s\n", infotext[i++]);
}

static const char* get_symtype_str(SYM_TYPE st)
{
    switch (st)
    {
    case -1:            return "\\";
    default:
    case SymNone:       return "--none--";
    case SymCoff:       return "COFF";
    case SymCv:         return "CodeView";
    case SymPdb:        return "PDB";
    case SymExport:     return "Export";
    case SymDeferred:   return "Deferred";
    case SymSym:        return "Sym";
    case SymDia:        return "DIA";
    case NumSymTypes:   return "Stabs";
    }
}

struct info_module
{
    IMAGEHLP_MODULE*    mi;
    unsigned            num_alloc;
    unsigned            num_used;
};

static void module_print_info(const IMAGEHLP_MODULE* mi, SYM_TYPE st)
{
    dbg_printf("0x%08lx-%08lx\t%-16s%s\n",
               mi->BaseOfImage, mi->BaseOfImage + mi->ImageSize,
               get_symtype_str(st), mi->ModuleName);
}

static int      module_compare(const void* p1, const void* p2)
{
    return (char*)(((const IMAGEHLP_MODULE*)p1)->BaseOfImage) -
        (char*)(((const IMAGEHLP_MODULE*)p2)->BaseOfImage);
}

static inline BOOL module_is_container(const IMAGEHLP_MODULE* wmod_cntnr,
                                     const IMAGEHLP_MODULE* wmod_child)
{
    return wmod_cntnr->BaseOfImage <= wmod_child->BaseOfImage &&
        (DWORD)wmod_cntnr->BaseOfImage + wmod_cntnr->ImageSize >=
        (DWORD)wmod_child->BaseOfImage + wmod_child->ImageSize;
}

static BOOL CALLBACK info_mod_cb(PSTR mod_name, DWORD base, void* ctx)
{
    struct info_module* im = (struct info_module*)ctx;

    if (im->num_used + 1 > im->num_alloc)
    {
        im->num_alloc += 16;
        im->mi = dbg_heap_realloc(im->mi, im->num_alloc * sizeof(*im->mi));
    }
    im->mi[im->num_used].SizeOfStruct = sizeof(im->mi[im->num_used]);
    if (SymGetModuleInfo(dbg_curr_process->handle, base, &im->mi[im->num_used]))
    {
        im->num_used++;
    }   
    return TRUE;
}

/***********************************************************************
 *           info_win32_module
 *
 * Display information about a given module (DLL or EXE), or about all modules
 */
void info_win32_module(DWORD base)
{
    if (!dbg_curr_process || !dbg_curr_thread)
    {
        dbg_printf("Cannot get info on module while no process is loaded\n");
        return;
    }

    if (base)
    {
        IMAGEHLP_MODULE     mi;

        mi.SizeOfStruct = sizeof(mi);

        if (!SymGetModuleInfo(dbg_curr_process->handle, base, &mi))
        {
            dbg_printf("'0x%08lx' is not a valid module address\n", base);
            return;
        }
        module_print_info(&mi, mi.SymType);
    }
    else
    {
        struct info_module      im;
        int             i, j;
        DWORD                   opt;

        im.mi = NULL;
        im.num_alloc = im.num_used = 0;

        /* this is a wine specific options to return also ELF modules in the
         * enumeration
         */
        SymSetOptions((opt = SymGetOptions()) | 0x40000000);
        SymEnumerateModules(dbg_curr_process->handle, info_mod_cb, (void*)&im);
        SymSetOptions(opt);

        qsort(im.mi, im.num_used, sizeof(im.mi[0]), module_compare);

        dbg_printf("Module\tAddress\t\t\tDebug info\tName (%d modules)\n", im.num_used);

        for (i = 0; i < im.num_used; i++)
        {
            if (strstr(im.mi[i].ModuleName, "<elf>"))
            {
                dbg_printf("ELF\t");
                module_print_info(&im.mi[i], (im.mi[i].SymType == SymDia) ? NumSymTypes : im.mi[i].SymType);
                /* print all modules embedded in this one */
                for (j = 0; j < im.num_used; j++)
                {
                    if (!strstr(im.mi[j].ModuleName, "<elf>") && module_is_container(&im.mi[i], &im.mi[j]))
                    {
                        dbg_printf("  \\-PE\t");
                        module_print_info(&im.mi[j], -1);
                    }
                }
            }
            else
            {
                /* check module is not embedded in another module */
                for (j = 0; j < im.num_used; j++) 
                {
                    if (strstr(im.mi[j].ModuleName, "<elf>") && module_is_container(&im.mi[j], &im.mi[i]))
                        break;
                }
                if (j < im.num_used) continue;
                if (strstr(im.mi[i].ModuleName, ".so") || strchr(im.mi[i].ModuleName, '<'))
                    dbg_printf("ELF\t");
                else
                    dbg_printf("PE\t");
                module_print_info(&im.mi[i], im.mi[i].SymType);
            }
        }
        HeapFree(GetProcessHeap(), 0, im.mi);
    }
}

struct class_walker
{
    ATOM*   table;
    int           used;
    int           alloc;
};

static void class_walker(HWND hWnd, struct class_walker* cw)
{
    char    clsName[128];
    int             i;
    ATOM    atom;
    HWND    child;

    if (!GetClassName(hWnd, clsName, sizeof(clsName)))
        return;
    if ((atom = FindAtom(clsName)) == 0)
        return;

    for (i = 0; i < cw->used; i++)
    {
        if (cw->table[i] == atom)
            break;
    }
    if (i == cw->used)
    {
        if (cw->used >= cw->alloc)
        {
            cw->alloc += 16;
            cw->table = dbg_heap_realloc(cw->table, cw->alloc * sizeof(ATOM));
        }
        cw->table[cw->used++] = atom;
        info_win32_class(hWnd, clsName);
    }
    do
    {
        if ((child = GetWindow(hWnd, GW_CHILD)) != 0)
            class_walker(child, cw);
    } while ((hWnd = GetWindow(hWnd, GW_HWNDNEXT)) != 0);
}

void info_win32_class(HWND hWnd, const char* name)
{
    WNDCLASSEXA   wca;
    HINSTANCE   hInst = hWnd ? (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE) : 0;

    if (!name)
    {
        struct class_walker cw;

        cw.table = NULL;
        cw.used = cw.alloc = 0;
        class_walker(GetDesktopWindow(), &cw);
        HeapFree(GetProcessHeap(), 0, cw.table);
        return;
    }

    if (!GetClassInfoEx(hInst, name, &wca))
    {
        dbg_printf("Cannot find class '%s'\n", name);
        return;
    }

    dbg_printf("Class '%s':\n", name);
    dbg_printf("style=0x%08x  wndProc=0x%08lx\n"
               "inst=%p  icon=%p  cursor=%p  bkgnd=%p\n"
               "clsExtra=%d  winExtra=%d\n",
               wca.style, (DWORD)wca.lpfnWndProc, wca.hInstance,
               wca.hIcon, wca.hCursor, wca.hbrBackground,
               wca.cbClsExtra, wca.cbWndExtra);

    if (hWnd && wca.cbClsExtra)
    {
        int       i;
        WORD            w;

        dbg_printf("Extra bytes:");
        for (i = 0; i < wca.cbClsExtra / 2; i++)
        {
            w = GetClassWord(hWnd, i * 2);
            /* FIXME: depends on i386 endian-ity */
            dbg_printf(" %02x %02x", HIBYTE(w), LOBYTE(w));
        }
        dbg_printf("\n");
    }
    dbg_printf("\n");
    /* FIXME:
     * + print #windows (or even list of windows...)
     * + print extra bytes => this requires a window handle on this very class...
     */
}

static void info_window(HWND hWnd, int indent)
{
    char    clsName[128];
    char    wndName[128];
    HWND    child;

    do
    {
        if (!GetClassName(hWnd, clsName, sizeof(clsName)))
            strcpy(clsName, "-- Unknown --");
        if (!GetWindowText(hWnd, wndName, sizeof(wndName)))
            strcpy(wndName, "-- Empty --");

        dbg_printf("%*s%08x%*s %-17.17s %08lx %08lx %08lx %.14s\n",
                   indent, "", (UINT)hWnd, 12 - indent, "",
                   clsName, GetWindowLong(hWnd, GWL_STYLE),
                   GetWindowLong(hWnd, GWL_WNDPROC),
                   GetWindowThreadProcessId(hWnd, NULL), wndName);

        if ((child = GetWindow(hWnd, GW_CHILD)) != 0)
            info_window(child, indent + 1);
    } while ((hWnd = GetWindow(hWnd, GW_HWNDNEXT)) != 0);
}

void info_win32_window(HWND hWnd, BOOL detailed)
{
    char    clsName[128];
    char    wndName[128];
    RECT    clientRect;
    RECT    windowRect;
    int         i;
    WORD    w;

    if (!IsWindow(hWnd)) hWnd = GetDesktopWindow();

    if (!detailed)
    {
        dbg_printf("%-20.20s %-17.17s %-8.8s %-8.8s %-8.8s %s\n",
                   "Window handle", "Class Name", "Style", "WndProc", "Thread", "Text");
        info_window(hWnd, 0);
        return;
    }

    if (!GetClassName(hWnd, clsName, sizeof(clsName)))
        strcpy(clsName, "-- Unknown --");
    if (!GetWindowText(hWnd, wndName, sizeof(wndName)))
        strcpy(wndName, "-- Empty --");
    if (!GetClientRect(hWnd, &clientRect) || 
        !MapWindowPoints(hWnd, 0, (LPPOINT) &clientRect, 2))
        SetRectEmpty(&clientRect);
    if (!GetWindowRect(hWnd, &windowRect))
        SetRectEmpty(&windowRect);

    /* FIXME missing fields: hmemTaskQ, hrgnUpdate, dce, flags, pProp, scroll */
    dbg_printf("next=%p  child=%p  parent=%p  owner=%p  class='%s'\n"
               "inst=%p  active=%p  idmenu=%08lx\n"
               "style=0x%08lx  exstyle=0x%08lx  wndproc=0x%08lx  text='%s'\n"
               "client=%ld,%ld-%ld,%ld  window=%ld,%ld-%ld,%ld sysmenu=%p\n",
               GetWindow(hWnd, GW_HWNDNEXT),
               GetWindow(hWnd, GW_CHILD),
               GetParent(hWnd),
               GetWindow(hWnd, GW_OWNER),
               clsName,
               (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE),
               GetLastActivePopup(hWnd),
               GetWindowLong(hWnd, GWL_ID),
               GetWindowLong(hWnd, GWL_STYLE),
               GetWindowLong(hWnd, GWL_EXSTYLE),
               GetWindowLong(hWnd, GWL_WNDPROC),
               wndName,
               clientRect.left, clientRect.top, clientRect.right, clientRect.bottom,
               windowRect.left, windowRect.top, windowRect.right, windowRect.bottom,
               GetSystemMenu(hWnd, FALSE));

    if (GetClassLong(hWnd, GCL_CBWNDEXTRA))
    {
        dbg_printf("Extra bytes:");
        for (i = 0; i < GetClassLong(hWnd, GCL_CBWNDEXTRA) / 2; i++)
        {
            w = GetWindowWord(hWnd, i * 2);
            /* FIXME: depends on i386 endian-ity */
            dbg_printf(" %02x %02x", HIBYTE(w), LOBYTE(w));
      }
        dbg_printf("\n");
    }
    dbg_printf("\n");
}

void info_win32_processes(void)
{
    HANDLE snap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    if (snap != INVALID_HANDLE_VALUE)
    {
        PROCESSENTRY32  entry;
        DWORD           current = dbg_curr_process ? dbg_curr_process->pid : 0;
        BOOL            ok;

        entry.dwSize = sizeof(entry);
        ok = Process32First(snap, &entry);

        dbg_printf(" %-8.8s %-8.8s %-8.8s %s (all id:s are in hex)\n",
                   "pid", "threads", "parent", "executable");
        while (ok)
        {
            if (entry.th32ProcessID != GetCurrentProcessId())
                dbg_printf("%c%08lx %-8ld %08lx '%s'\n",
                           (entry.th32ProcessID == current) ? '>' : ' ',
                           entry.th32ProcessID, entry.cntThreads,
                           entry.th32ParentProcessID, entry.szExeFile);
            ok = Process32Next(snap, &entry);
        }
        CloseHandle(snap);
    }
}

void info_win32_threads(void)
{
    HANDLE snap = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
    if (snap != INVALID_HANDLE_VALUE)
    {
        THREADENTRY32   entry;
        BOOL            ok;
      DWORD       lastProcessId = 0;

      entry.dwSize = sizeof(entry);
      ok = Thread32First(snap, &entry);

        dbg_printf("%-8.8s %-8.8s %s (all id:s are in hex)\n",
                   "process", "tid", "prio");
        while (ok)
        {
            if (entry.th32OwnerProcessID != GetCurrentProcessId())
          {
            /* FIXME: this assumes that, in the snapshot, all threads of a same process are
             * listed sequentially, which is not specified in the doc (Wine's implementation
             * does it)
             */
            if (entry.th32OwnerProcessID != lastProcessId)
            {
                struct dbg_process* p = dbg_get_process(entry.th32OwnerProcessID);

                dbg_printf("%08lx%s %s\n",
                               entry.th32OwnerProcessID, p ? " (D)" : "", p ? p->imageName : "");
                lastProcessId = entry.th32OwnerProcessID;
            }
                dbg_printf("\t%08lx %4ld%s\n",
                           entry.th32ThreadID, entry.tpBasePri,
                           (entry.th32ThreadID == dbg_curr_tid) ? " <==" : "");

          }
            ok = Thread32Next(snap, &entry);
        }

        CloseHandle(snap);
    }
}

/***********************************************************************
 *           info_win32_exceptions
 *
 * Get info on the exception frames of a given thread.
 */
void info_win32_exceptions(DWORD tid)
{
    struct dbg_thread*  thread;
    void*               next_frame;

    if (!dbg_curr_process || !dbg_curr_thread)
    {
        dbg_printf("Cannot get info on exceptions while no process is loaded\n");
        return;
    }

    dbg_printf("Exception frames:\n");

    if (tid == dbg_curr_tid) thread = dbg_curr_thread;
    else
    {
        thread = dbg_get_thread(dbg_curr_process, tid);

        if (!thread)
        {
            dbg_printf("Unknown thread id (0x%08lx) in current process\n", tid);
            return;
        }
        if (SuspendThread(thread->handle) == -1)
        {
            dbg_printf("Can't suspend thread id (0x%08lx)\n", tid);
            return;
        }
    }

    if (!dbg_read_memory(thread->teb, &next_frame, sizeof(next_frame)))
    {
        dbg_printf("Can't read TEB:except_frame\n");
        return;
    }

    while (next_frame != (void*)-1)
    {
        EXCEPTION_REGISTRATION_RECORD frame;

        dbg_printf("%p: ", next_frame);
        if (!dbg_read_memory(next_frame, &frame, sizeof(frame)))
        {
            dbg_printf("Invalid frame address\n");
            break;
        }
        dbg_printf("prev=%p handler=%p\n", frame.Prev, frame.Handler);
        next_frame = frame.Prev;
    }

    if (tid != dbg_curr_tid) ResumeThread(thread->handle);
}

void info_win32_segments(DWORD start, int length)
{
    char    flags[3];
    DWORD   i;
    LDT_ENTRY     le;

    if (length == -1) length = (8192 - start);

    for (i = start; i < start + length; i++)
    {
        if (!GetThreadSelectorEntry(dbg_curr_thread->handle, (i << 3) | 7, &le))
            continue;

        if (le.HighWord.Bits.Type & 0x08)
        {
            flags[0] = (le.HighWord.Bits.Type & 0x2) ? 'r' : '-';
            flags[1] = '-';
            flags[2] = 'x';
        }
        else
        {
            flags[0] = 'r';
            flags[1] = (le.HighWord.Bits.Type & 0x2) ? 'w' : '-';
            flags[2] = '-';
        }
        dbg_printf("%04lx: sel=%04lx base=%08x limit=%08x %d-bit %c%c%c\n",
                   i, (i << 3) | 7,
                   (le.HighWord.Bits.BaseHi << 24) +
                   (le.HighWord.Bits.BaseMid << 16) + le.BaseLow,
                   ((le.HighWord.Bits.LimitHi << 8) + le.LimitLow) <<
                   (le.HighWord.Bits.Granularity ? 12 : 0),
                   le.HighWord.Bits.Default_Big ? 32 : 16,
                   flags[0], flags[1], flags[2]);
    }
}

void info_win32_virtual(DWORD pid)
{
    MEMORY_BASIC_INFORMATION    mbi;
    char*                       addr = 0;
    const char*                 state;
    const char*                 type;
    char                        prot[3+1];
    HANDLE                      hProc;

    if (pid == dbg_curr_pid)
    {
        if (dbg_curr_process == NULL)
        {
            dbg_printf("Cannot look at mapping of current process, while no process is loaded\n");
            return;
        }
        hProc = dbg_curr_process->handle;
    }
    else
    {
        hProc = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, pid);
        if (hProc == NULL)
        {
            dbg_printf("Cannot open process <%lu>\n", pid);
            return;
        }
    }

    dbg_printf("Address  Size     State   Type    RWX\n");

    while (VirtualQueryEx(hProc, addr, &mbi, sizeof(mbi)) >= sizeof(mbi))
    {
        switch (mbi.State)
        {
        case MEM_COMMIT:        state = "commit "; break;
        case MEM_FREE:          state = "free   "; break;
        case MEM_RESERVE:       state = "reserve"; break;
        default:                state = "???    "; break;
        }
        if (mbi.State != MEM_FREE)
        {
            switch (mbi.Type)
            {
            case MEM_IMAGE:         type = "image  "; break;
            case MEM_MAPPED:        type = "mapped "; break;
            case MEM_PRIVATE:       type = "private"; break;
            case 0:                 type = "       "; break;
            default:                type = "???    "; break;
            }
            memset(prot, ' ' , sizeof(prot) - 1);
            prot[sizeof(prot) - 1] = '\0';
            if (mbi.AllocationProtect & (PAGE_READONLY|PAGE_READWRITE|PAGE_EXECUTE_READ|PAGE_EXECUTE_READWRITE))
                prot[0] = 'R';
            if (mbi.AllocationProtect & (PAGE_READWRITE|PAGE_EXECUTE_READWRITE))
                prot[1] = 'W';
            if (mbi.AllocationProtect & (PAGE_WRITECOPY|PAGE_EXECUTE_WRITECOPY))
                prot[1] = 'C';
            if (mbi.AllocationProtect & (PAGE_EXECUTE|PAGE_EXECUTE_READ|PAGE_EXECUTE_READWRITE))
                prot[2] = 'X';
        }
        else
        {
            type = "";
            prot[0] = '\0';
        }
        dbg_printf("%08lx %08lx %s %s %s\n",
                   (DWORD)addr, (DWORD)addr + mbi.RegionSize - 1, state, type, prot);
        if (addr + mbi.RegionSize < addr) /* wrap around ? */
            break;
        addr += mbi.RegionSize;
    }
    if (pid != dbg_curr_pid) CloseHandle(hProc);
}

struct dll_option_layout
{
    void*               next;
    void*               prev;
    char* const*        channels;
    int                 nb_channels;
};

void info_wine_dbg_channel(BOOL turn_on, const char* chnl, const char* name)
{
    struct dbg_lvalue           lvalue;
    struct dll_option_layout    dol;
    int                         i;
    char*                       str;
    unsigned char               buffer[32];
    unsigned char               mask;
    int                         done = 0;
    BOOL                        bAll;
    void*                       addr;

    if (!dbg_curr_process || !dbg_curr_thread)
    {
        dbg_printf("Cannot set/get debug channels while no process is loaded\n");
        return;
    }

    if (symbol_get_lvalue("first_dll", -1, &lvalue, FALSE) != sglv_found)
    {
        return;
    }
    addr = memory_to_linear_addr(&lvalue.addr);
    if (!chnl)                          mask = 15;
    else if (!strcmp(chnl, "fixme"))    mask = 1;
    else if (!strcmp(chnl, "err"))      mask = 2;
    else if (!strcmp(chnl, "warn"))     mask = 4;
    else if (!strcmp(chnl, "trace"))    mask = 8;
    else { dbg_printf("Unknown channel %s\n", chnl); return; }

    bAll = !strcmp("all", name);
    while (addr && dbg_read_memory(addr, &dol, sizeof(dol)))
    {
        for (i = 0; i < dol.nb_channels; i++)
        {
            if (dbg_read_memory(dol.channels + i, &str, sizeof(str)) &&
                dbg_read_memory(str, buffer, sizeof(buffer)) &&
                (!strcmp(buffer + 1, name) || bAll))
            {
                if (turn_on) buffer[0] |= mask; else buffer[0] &= ~mask;
                if (dbg_write_memory(str, buffer, 1)) done++;
            }
        }
        addr = dol.next;
    }
    if (!done) dbg_printf("Unable to find debug channel %s\n", name);
    else WINE_TRACE("Changed %d channel instances\n", done);
}

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