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640 lines
22 KiB
C
640 lines
22 KiB
C
// swad_autolink.c: inserting automatic links in text
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/*
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SWAD (Shared Workspace At a Distance),
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is a web platform developed at the University of Granada (Spain),
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and used to support university teaching.
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This file is part of SWAD core.
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Copyright (C) 1999-2023 Antonio Cañas Vargas
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*****************************************************************************/
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/********************************* Headers ***********************************/
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/*****************************************************************************/
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#define _GNU_SOURCE // For asprintf
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#include <ctype.h> // For tolower
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#include <stddef.h> // For NULL
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#include <stdio.h> // For asprintf
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#include <stdlib.h> // For malloc and free
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#include <string.h> // For string functions
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#include "swad_action_list.h"
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#include "swad_autolink.h"
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#include "swad_config.h"
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#include "swad_error.h"
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#include "swad_form.h"
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#include "swad_global.h"
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#include "swad_nickname.h"
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#include "swad_nickname_database.h"
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#include "swad_photo.h"
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#include "swad_string.h"
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#include "swad_user.h"
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/*****************************************************************************/
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/******************************* Private types *******************************/
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/*****************************************************************************/
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typedef enum
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{
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ALn_LINK_UNKNOWN = 0,
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ALn_LINK_URL = 1,
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ALn_LINK_NICK = 2,
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} ALn_LinkType_t;
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struct ALn_Substring
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{
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char *Str; // Pointer to the first char of substring
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size_t Len; // Length of the substring
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};
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struct ALn_Link
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{
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ALn_LinkType_t Type; // URL or nickname?
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struct ALn_Substring URLorNick; // Link text
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struct ALn_Substring NickAnchor[3]; // Pointer to anchors if nick
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size_t LengthAddedUpToHere; // Total length of extra HTML code
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// added up to this link (included)
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struct ALn_Link *Prev; // Pointer to previous link
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struct ALn_Link *Next; // Pointer to next link
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};
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/*****************************************************************************/
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/******************** Global variables from other modules ********************/
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/*****************************************************************************/
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extern struct Globals Gbl;
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/*****************************************************************************/
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/*************************** Private prototypes ******************************/
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/*****************************************************************************/
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static void ALn_CreateFirstLink (struct ALn_Link **Link,
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struct ALn_Link **LastLink);
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static void ALn_CreateNextLink (struct ALn_Link **Link,
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struct ALn_Link **LastLink);
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static void ALn_FreeLinks (struct ALn_Link *LastLink);
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static ALn_LinkType_t ALn_CheckURL (char **PtrSrc,char PrevCh,
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struct ALn_Link **Link,
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struct ALn_Link **LastLink,
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size_t MaxCharsURLOnScreen);
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static ALn_LinkType_t ALn_CheckNickname (char **PtrSrc,char PrevCh,
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struct ALn_Link **Link,
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struct ALn_Link **LastLink);
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static void ALn_CopySubstring (const struct ALn_Substring *PtrSrc,char **PtrDst);
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/*****************************************************************************/
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/**************************** Private constants ******************************/
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/*****************************************************************************/
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// For URLs the length of anchor is fixed, so it can be calculated once
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#define ALn_URL_ANCHOR_0 "<a href=\""
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#define ALn_URL_ANCHOR_1 "\" target=\"_blank\">"
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#define ALn_URL_ANCHOR_2 "</a>"
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#define ALn_URL_ANCHOR_0_LENGTH (sizeof (ALn_URL_ANCHOR_0) - 1)
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#define ALn_URL_ANCHOR_1_LENGTH (sizeof (ALn_URL_ANCHOR_1) - 1)
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#define ALn_URL_ANCHOR_2_LENGTH (sizeof (ALn_URL_ANCHOR_2) - 1)
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#define ALn_URL_ANCHOR_TOTAL_LENGTH (ALn_URL_ANCHOR_0_LENGTH + ALn_URL_ANCHOR_1_LENGTH + ALn_URL_ANCHOR_2_LENGTH)
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static const struct ALn_Substring URLAnchor[3] =
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{
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[0] = {
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.Str = ALn_URL_ANCHOR_0,
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.Len = ALn_URL_ANCHOR_0_LENGTH,
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},
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[1] = {
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.Str = ALn_URL_ANCHOR_1,
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.Len = ALn_URL_ANCHOR_1_LENGTH,
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},
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[2] = {
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.Str = ALn_URL_ANCHOR_2,
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.Len = ALn_URL_ANCHOR_2_LENGTH,
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},
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};
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/*****************************************************************************/
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/************** Insert automatic links in every URL or nickname **************/
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/*****************************************************************************/
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/*
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Insertion example:
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The web site of @rms is https://stallman.org/
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The web site of <a href="https://openswad.org/?usr=@rms">@rms</a> is <a href="https://stallman.org/" target="_blank">https://stallman.org/</a>
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*/
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/*
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<form action="https://localhost/swad/es" method="post">
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<input type="hidden" name="ses" value="2jb9CGhIJ81_qhDyeQ6MWDFKQ5ZaA_F68tq22ZAjYww">
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<input type="hidden" name="usr" value="@acanas">
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<button type="submit" class="NICK_WHITE">
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@acanas
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</button>
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</form>
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*/
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/*
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______ ______ ______ ______
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|______|<-- -->|______|<-- -->|______|<-- -->|______|<--- LastLink
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|______| \/ |______| \/ |______| \/ |______|
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|______| /\ |______| /\ |______| /\ |______|
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|_NULL_| / ---|_Prev_| / ---|_Prev_| / ---|_Prev_|
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|_Next_|-- |_Next_|-- |_Next_|-- |_NULL_|
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1 Move forward the text after the link
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2 Copy the 3rd part of the anchor
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3 Move forward the link
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4 Copy the 2nd part of the anchor
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5 Copy the link into the anchor
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6 Copy the 1st part of the anchor
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Hi @admin, can I use https://openswad.org for free?
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_______________________________
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|H|i|_|@|a|d|m|i|n|,|_|c|a|n|...|
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| | | | | | | | | | | | | | |
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| | | | | | | | | \_\_\_\_\_\______________________________________1____
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| | | \ \ \ \ \ \ \ \ \ \ \ \
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| | | \_\_\_\_\_\_________________________3____ | | | | | |
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| | | \ \ \ \ \ \ \ \ \ \ \ \ | | | | | |
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| | | \_\_\_\_\_\_5____ | | | | | | | | | | | |
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| | | \ \ \ \ \ \ | | | | | | | | | | | |
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| | | 6 | | | | | | 4 | | | | | | 2 | | | | | |
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v v v anchor#1 v v v v v v anchor#2 v v v v v v anchor#3 v v v v v v
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___________________________________________________________________________
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|H|i|_|<|_|_|_|_|@|a|d|m|i|n|_|_|_|_|>|@|a|d|m|i|n|<|_|_|_|_|>|,|_|c|a|n|...|
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*/
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void ALn_InsertLinks (char *Txt,unsigned long MaxLength,size_t MaxCharsURLOnScreen)
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{
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size_t TxtLength;
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char PrevCh = '\0';
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char *PtrSrc;
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char *PtrDst;
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struct ALn_Link *Link;
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struct ALn_Link *LastLink;
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size_t Length;
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size_t i;
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struct ALn_Substring Limited; // URL displayed on screen (may be shorter than actual length)
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const struct ALn_Substring *Anchor[3];
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/**************************************************************/
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/***** Find starts and ends of links (URLs and nicknames) *****/
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/**************************************************************/
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ALn_CreateFirstLink (&Link,&LastLink);
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for (PtrSrc = Txt;
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*PtrSrc;)
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/* Check if the next char is the start of a URL */
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if ((Link->Type = ALn_CheckURL (&PtrSrc,PrevCh,
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&Link,&LastLink,
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MaxCharsURLOnScreen)) == ALn_LINK_UNKNOWN)
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/* Check if the next char is the start of a nickname */
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if ((Link->Type = ALn_CheckNickname (&PtrSrc,PrevCh,
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&Link,&LastLink)) == ALn_LINK_UNKNOWN)
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/* The next char is not the start of a URL or a nickname */
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if (*PtrSrc) // If the end has not been reached
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{
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PrevCh = *PtrSrc;
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PtrSrc++;
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}
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/**********************************************************************/
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/***** If there are one or more links (URLs or nicknames) in text *****/
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/**********************************************************************/
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if (LastLink) // Not null ==> one or more links found
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{
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/***** Insert links from end to start of text,
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only if there is enough space available in text *****/
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TxtLength = strlen (Txt);
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if (TxtLength + LastLink->LengthAddedUpToHere <= MaxLength)
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{
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for (Link = LastLink;
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Link;
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Link = Link->Prev)
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{
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/***** Set anchors *****/
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switch (Link->Type)
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{
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case ALn_LINK_URL:
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Anchor[0] = &URLAnchor[0];
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Anchor[1] = &URLAnchor[1];
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Anchor[2] = &URLAnchor[2];
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break;
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case ALn_LINK_NICK:
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Anchor[0] = &Link->NickAnchor[0];
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Anchor[1] = &Link->NickAnchor[1];
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Anchor[2] = &Link->NickAnchor[2];
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break;
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default:
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continue;
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}
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/***** Step 1: Move forward the text after the link (URL or nickname)
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(it's mandatory to do the copy in reverse order
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to avoid overwriting source) *****/
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PtrSrc = (Link == LastLink) ? Txt + TxtLength :
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Link->Next->URLorNick.Str - 1;
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PtrDst = PtrSrc + Link->LengthAddedUpToHere;
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Length = PtrSrc - (Link->URLorNick.Str + Link->URLorNick.Len - 1);
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for (i = 0;
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i < Length;
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i++)
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*PtrDst-- = *PtrSrc--;
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/***** Step 2: Copy the third part of the anchor *****/
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ALn_CopySubstring (Anchor[2],&PtrDst);
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/***** Step 3: Move forward the link (URL or nickname)
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to be shown on screen *****/
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switch (Link->Type)
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{
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case ALn_LINK_URL:
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if (Link->URLorNick.Len <= MaxCharsURLOnScreen)
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ALn_CopySubstring (&Link->URLorNick,&PtrDst);
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else
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{
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/* Limit the length of URL */
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if ((Limited.Str = malloc (Link->URLorNick.Len + 1)) == NULL)
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Err_NotEnoughMemoryExit ();
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strncpy (Limited.Str,Link->URLorNick.Str,Link->URLorNick.Len);
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Limited.Str[Link->URLorNick.Len] = '\0';
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Limited.Len = Str_LimitLengthHTMLStr (Limited.Str,MaxCharsURLOnScreen);
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ALn_CopySubstring (&Limited,&PtrDst);
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free (Limited.Str);
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}
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break;
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case ALn_LINK_NICK:
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ALn_CopySubstring (&Link->URLorNick,&PtrDst);
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break;
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default:
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break;
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}
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/***** Step 4: Copy the second part of the anchor *****/
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ALn_CopySubstring (Anchor[1],&PtrDst);
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/***** Step 5: Copy the link into the anchor
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(it's mandatory to do the copy in reverse order
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to avoid overwriting source URL or nickname) *****/
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ALn_CopySubstring (&Link->URLorNick,&PtrDst);
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/***** Step 6: Copy the first part of the anchor *****/
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ALn_CopySubstring (Anchor[0],&PtrDst);
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}
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}
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}
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/***********************************/
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/***** Free memory for anchors *****/
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/***********************************/
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ALn_FreeLinks (LastLink);
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}
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/***************************** Create first link ******************************/
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static void ALn_CreateFirstLink (struct ALn_Link **Link,
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struct ALn_Link **LastLink)
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{
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/***** Reset last link pointer *****/
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(*LastLink) = NULL;
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/***** Allocate current link *****/
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if (((*Link) = malloc (sizeof (struct ALn_Link))) == NULL)
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Err_NotEnoughMemoryExit ();
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/***** Initialize current link *****/
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(*Link)->Prev = NULL;
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(*Link)->Next = NULL;
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}
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/***************************** Create next link ******************************/
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static void ALn_CreateNextLink (struct ALn_Link **Link,
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struct ALn_Link **LastLink)
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{
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/***** Current link now is pointing to a correct link,
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so set last link pointer to current link *****/
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(*LastLink) = (*Link);
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/***** Allocate next link *****/
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if (((*Link)->Next = malloc (sizeof (struct ALn_Link))) == NULL)
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Err_NotEnoughMemoryExit ();
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/***** Initialize next link *****/
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(*Link)->Next->Prev = *Link;
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(*Link)->Next->Next = NULL;
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/***** Change current link to just allocated link *****/
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(*Link) = (*Link)->Next;
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}
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/***************************** Free found links ******************************/
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static void ALn_FreeLinks (struct ALn_Link *LastLink)
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{
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struct ALn_Link *Link;
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struct ALn_Link *PrevLink;
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for (Link = LastLink;
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Link;
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Link = PrevLink)
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{
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PrevLink = Link->Prev;
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if (Link->Type == ALn_LINK_NICK)
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{
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if (Link->NickAnchor[2].Str) free (Link->NickAnchor[2].Str);
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if (Link->NickAnchor[1].Str) free (Link->NickAnchor[1].Str);
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if (Link->NickAnchor[0].Str) free (Link->NickAnchor[0].Str);
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}
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free (Link);
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}
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}
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/**************************** Check if a URL found ***************************/
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static ALn_LinkType_t ALn_CheckURL (char **PtrSrc,char PrevCh,
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struct ALn_Link **Link,
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struct ALn_Link **LastLink,
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size_t MaxCharsURLOnScreen)
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{
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unsigned char Ch;
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size_t NumChars1;
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size_t NumChars2;
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char *PtrEnd; // Pointer to the last char of URL/nickname in original text
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char *Limited; // URL displayed on screen (may be shorter than actual length)
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ALn_LinkType_t Type = ALn_LINK_UNKNOWN;
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/***** Check if the next char is the start of a URL *****/
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if (tolower ((int) *(*PtrSrc)) == (int) 'h')
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if (!Str_ChIsAlphaNum (PrevCh))
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{
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(*Link)->URLorNick.Str = (*PtrSrc);
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if (tolower ((int) *++(*PtrSrc)) == (int) 't') // ht...
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{
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if (tolower ((int) *++(*PtrSrc)) == (int) 't') // htt...
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{
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if (tolower ((int) *++(*PtrSrc)) == (int) 'p') // http...
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{
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(*PtrSrc)++;
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if (*(*PtrSrc) == ':') // http:...
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{
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if (*++(*PtrSrc) == '/') // http:/...
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if (*++(*PtrSrc) == '/') // http://...
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Type = ALn_LINK_URL;
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}
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else if (tolower ((int) *(*PtrSrc)) == (int) 's') // https...
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{
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if (*++(*PtrSrc) == ':') // https:...
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{
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if (*++(*PtrSrc) == '/') // https:/...
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if (*++(*PtrSrc) == '/') // https://...
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Type = ALn_LINK_URL;
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}
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}
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}
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}
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}
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if (Type == ALn_LINK_URL)
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{
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/***** Find URL end *****/
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(*PtrSrc)++; // Points to first character after http:// or https://
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for (;;)
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{
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NumChars1 = Str_GetNextASCIICharFromStr ((*PtrSrc),&Ch);
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(*PtrSrc) += NumChars1;
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if (Ch <= 32 || Ch == '<' || Ch == '"')
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{
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PtrEnd = (*PtrSrc) - NumChars1 - 1;
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break;
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}
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else if (Ch == ',' || Ch == '.' || Ch == ';' || Ch == ':' ||
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Ch == ')' || Ch == ']' || Ch == '}')
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{
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NumChars2 = Str_GetNextASCIICharFromStr ((*PtrSrc),&Ch);
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(*PtrSrc) += NumChars2;
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if (Ch <= 32 || Ch == '<' || Ch == '"')
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{
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PtrEnd = (*PtrSrc) - NumChars2 - NumChars1 - 1;
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break;
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}
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}
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}
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/***** Compute number of bytes added until here *****/
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(*Link)->LengthAddedUpToHere = (*Link)->Prev ? (*Link)->Prev->LengthAddedUpToHere :
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0;
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(*Link)->URLorNick.Len = (size_t) (PtrEnd + 1 - (*Link)->URLorNick.Str);
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if ((*Link)->URLorNick.Len <= MaxCharsURLOnScreen)
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(*Link)->LengthAddedUpToHere += ALn_URL_ANCHOR_TOTAL_LENGTH +
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(*Link)->URLorNick.Len;
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else // If URL is too long to be displayed ==> short it
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{
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if ((Limited = malloc ((*Link)->URLorNick.Len + 1)) == NULL)
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Err_NotEnoughMemoryExit ();
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strncpy (Limited,(*Link)->URLorNick.Str,(*Link)->URLorNick.Len);
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Limited[(*Link)->URLorNick.Len] = '\0';
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(*Link)->LengthAddedUpToHere += ALn_URL_ANCHOR_TOTAL_LENGTH +
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Str_LimitLengthHTMLStr (Limited,MaxCharsURLOnScreen);
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free (Limited);
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}
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/***** Create next link *****/
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ALn_CreateNextLink (Link,LastLink);
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}
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}
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return Type;
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}
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/************************* Check if a nickname found *************************/
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static ALn_LinkType_t ALn_CheckNickname (char **PtrSrc,char PrevCh,
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struct ALn_Link **Link,
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struct ALn_Link **LastLink)
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{
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extern const char *Lan_STR_LANG_ID[1 + Lan_NUM_LANGUAGES];
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static const char *ClassPhoto[PhoSha_NUM_SHAPES] =
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{
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[PhoSha_SHAPE_CIRCLE ] = "PHOTOC12x16",
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[PhoSha_SHAPE_ELLIPSE ] = "PHOTOE12x16",
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[PhoSha_SHAPE_OVAL ] = "PHOTOO12x16",
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[PhoSha_SHAPE_RECTANGLE] = "PHOTOR12x16",
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};
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char Ch;
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size_t Length;
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char ParsStr[Frm_MAX_BYTES_PARAMS_STR + 1];
|
|
struct Usr_Data UsrDat;
|
|
bool ShowPhoto = false;
|
|
char PhotoURL[Cns_MAX_BYTES_WWW + 1];
|
|
char *CaptionStr;
|
|
char *ImgStr;
|
|
char NickWithoutArr[Nck_MAX_BYTES_NICK_WITHOUT_ARROBA + 1];
|
|
bool NickSeemsValid;
|
|
ALn_LinkType_t Type = ALn_LINK_UNKNOWN;
|
|
|
|
/***** Check if the next char is the start of a nickname *****/
|
|
Ch = *(*PtrSrc);
|
|
if (Ch == '@') // Current is @
|
|
if (!Str_ChIsAlphaNum (PrevCh)) // Previous is not alphanumeric
|
|
if (Str_ChIsAlphaNum (*((*PtrSrc) + 1))) // Next is alphanumeric
|
|
{
|
|
(*Link)->URLorNick.Str = (*PtrSrc);
|
|
|
|
/***** Find nickname end *****/
|
|
(*PtrSrc)++; // Points to first character after @
|
|
|
|
/***** A nick can have digits, letters and '_' *****/
|
|
for (;
|
|
*(*PtrSrc);
|
|
(*PtrSrc)++)
|
|
{
|
|
Ch = *(*PtrSrc);
|
|
if (!Str_ChIsAlphaNum (Ch))
|
|
break;
|
|
}
|
|
|
|
/***** Calculate length of this nickname *****/
|
|
(*Link)->URLorNick.Len = (size_t) ((*PtrSrc) - (*Link)->URLorNick.Str);
|
|
|
|
/***** A nick (without arroba) must have a number of characters
|
|
Nck_MIN_CHARS_NICK_WITHOUT_ARROBA <= Length <= Nck_MAX_CHARS_NICK_WITHOUT_ARROBA *****/
|
|
Length = (*Link)->URLorNick.Len - 1; // Do not count the initial @
|
|
NickSeemsValid = Length >= Nck_MIN_CHARS_NICK_WITHOUT_ARROBA &&
|
|
Length <= Nck_MAX_CHARS_NICK_WITHOUT_ARROBA;
|
|
|
|
if (NickSeemsValid)
|
|
{
|
|
/***** Create data for a user *****/
|
|
Usr_UsrDataConstructor (&UsrDat);
|
|
|
|
/***** Get user's code using nickname *****/
|
|
strncpy (NickWithoutArr,(*Link)->URLorNick.Str + 1,Length);
|
|
NickWithoutArr[Length] = '\0';
|
|
if ((UsrDat.UsrCod = Nck_DB_GetUsrCodFromNickname (NickWithoutArr)) > 0)
|
|
{
|
|
Type = ALn_LINK_NICK;
|
|
Usr_GetUsrDataFromUsrCod (&UsrDat,
|
|
Usr_DONT_GET_PREFS,
|
|
Usr_DONT_GET_ROLE_IN_CURRENT_CRS);
|
|
}
|
|
|
|
if (Type == ALn_LINK_NICK)
|
|
{
|
|
/***** Reset anchors (checked on freeing) *****/
|
|
(*Link)->NickAnchor[0].Str =
|
|
(*Link)->NickAnchor[1].Str =
|
|
(*Link)->NickAnchor[2].Str = NULL;
|
|
|
|
/***** Store first part of anchor *****/
|
|
Frm_SetParsForm (ParsStr,ActSeeOthPubPrf,true);
|
|
if (asprintf (&(*Link)->NickAnchor[0].Str,
|
|
"<form method=\"post\" action=\"%s/%s\">"
|
|
"%s" // Parameters
|
|
"<input type=\"hidden\" name=\"usr\" value=\"",
|
|
Cfg_URL_SWAD_CGI,
|
|
Lan_STR_LANG_ID[Gbl.Prefs.Language],
|
|
ParsStr) < 0)
|
|
Err_NotEnoughMemoryExit ();
|
|
(*Link)->NickAnchor[0].Len = strlen ((*Link)->NickAnchor[0].Str);
|
|
|
|
/***** Store second part of anchor *****/
|
|
if (asprintf (&(*Link)->NickAnchor[1].Str,
|
|
"\">"
|
|
"<button type=\"submit\" class=\"NICK_%s\">",
|
|
The_GetSuffix ()) < 0)
|
|
Err_NotEnoughMemoryExit ();
|
|
(*Link)->NickAnchor[1].Len = strlen ((*Link)->NickAnchor[1].Str);
|
|
|
|
/***** Store third part of anchor *****/
|
|
ShowPhoto = Pho_ShowingUsrPhotoIsAllowed (&UsrDat,PhotoURL);
|
|
Pho_BuildHTMLUsrPhoto (&UsrDat,ShowPhoto ? PhotoURL :
|
|
NULL,
|
|
ClassPhoto[Gbl.Prefs.PhotoShape],Pho_ZOOM,
|
|
&CaptionStr,
|
|
&ImgStr);
|
|
if (asprintf (&(*Link)->NickAnchor[2].Str,
|
|
"</button>"
|
|
"</form>"
|
|
"%s"
|
|
"%s",
|
|
CaptionStr,
|
|
ImgStr) < 0)
|
|
Err_NotEnoughMemoryExit ();
|
|
free (ImgStr);
|
|
free (CaptionStr);
|
|
(*Link)->NickAnchor[2].Len = strlen ((*Link)->NickAnchor[2].Str);
|
|
|
|
/***** Compute number of bytes added until here *****/
|
|
(*Link)->LengthAddedUpToHere = (*Link)->Prev ? (*Link)->Prev->LengthAddedUpToHere :
|
|
0;
|
|
(*Link)->LengthAddedUpToHere += (*Link)->NickAnchor[0].Len +
|
|
(*Link)->URLorNick.Len +
|
|
(*Link)->NickAnchor[1].Len +
|
|
(*Link)->NickAnchor[2].Len;
|
|
|
|
/***** Create next link *****/
|
|
ALn_CreateNextLink (Link,LastLink);
|
|
}
|
|
|
|
/***** Free memory used for user's data *****/
|
|
Usr_UsrDataDestructor (&UsrDat);
|
|
}
|
|
}
|
|
|
|
return Type;
|
|
}
|
|
|
|
/************** Copy source substring to destination, backwards **************/
|
|
|
|
static void ALn_CopySubstring (const struct ALn_Substring *Src,char **Dst)
|
|
{
|
|
char *PtrSrc; // Local pointer optimizes access to memory
|
|
char *PtrDst; // Local pointer optimizes access to memory
|
|
size_t Len = Src->Len;
|
|
/*
|
|
Example: Src->Str = "<a href=\""
|
|
Src->Len = 9
|
|
Src->Str
|
|
|
|
|
_v_________________
|
|
|<|a|_|h|r|e|f|=|"|
|
|
| | | | | | | | |
|
|
\ \ \ \ \ \ \ \ \
|
|
\ \ \ \ \ \ \ \ \
|
|
\ \ \ \ \ \ \ \ \
|
|
\ \ \ \ \ \ \ \ \
|
|
\ \ \ \ \ \ \ \ \
|
|
| | | | | | | | |
|
|
_______v_v_v_v_v_v_v_v_v_____________
|
|
|_|_|_|<|a|_|h|r|e|f|=|"|_|_|_|_|_|_|
|
|
^ ^
|
|
| |
|
|
PtrDst (*Dst)
|
|
The copy has to be done backwards to avoid overwriting the original string
|
|
*/
|
|
if (Len)
|
|
{
|
|
PtrSrc = Src->Str + Len - 1;
|
|
PtrDst = *Dst; // Make a local copy of destination pointer
|
|
for (;
|
|
Len;
|
|
Len--)
|
|
*PtrDst-- = *PtrSrc--;
|
|
*Dst = PtrDst; // Update destination pointer
|
|
}
|
|
}
|