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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*++
Module Name:
lstr.c
Abstract:
Implementation of functions manipulating unicode/ansi strings. (lstr*A/W)
--*/
#include "pal/palinternal.h"
#include "pal/dbgmsg.h"
SET_DEFAULT_DEBUG_CHANNEL(CRT);
/*++
Function:
lstrcatW
The lstrcat function appends one string to another.
Parameters
lpString1 [in/out] Pointer to a null-terminated string. The buffer must be large
enough to contain both strings.
lpString2 [in] Pointer to the null-terminated string to be appended to the
string specified in the lpString1 parameter.
Return Values
If the function succeeds, the return value is a pointer to the buffer.
If the function fails, the return value is NULL.
--*/
LPWSTR
PALAPI
lstrcatW(
IN OUT LPWSTR lpString1,
IN LPCWSTR lpString2)
{
LPWSTR lpStart = lpString1;
PERF_ENTRY(lstrcatW);
ENTRY("lstrcatW (lpString1=%p (%S), lpString2=%p (%S))\n",
lpString1?lpString1:W16_NULLSTRING,
lpString1?lpString1:W16_NULLSTRING, lpString2?lpString2:W16_NULLSTRING, lpString2?lpString2:W16_NULLSTRING);
if (lpString1 == NULL)
{
ERROR("invalid lpString1 argument\n");
LOGEXIT("lstrcatW returning LPWSTR NULL\n");
PERF_EXIT(lstrcatW);
return NULL;
}
if (lpString2 == NULL)
{
ERROR("invalid lpString2 argument\n");
LOGEXIT("lstrcatW returning LPWSTR NULL\n");
PERF_EXIT(lstrcatW);
return NULL;
}
/* find end of source string */
while (*lpString1)
{
lpString1++;
}
/* concatenate new string */
while(*lpString2)
{
*lpString1++ = *lpString2++;
}
/* add terminating null */
*lpString1 = '\0';
LOGEXIT("lstrcatW returning LPWSTR %p (%S)\n", lpStart, lpStart);
PERF_EXIT(lstrcatW);
return lpStart;
}
/*++
Function:
lstrcpyW
The lstrcpy function copies a string to a buffer.
To copy a specified number of characters, use the lstrcpyn function.
Parameters
lpString1 [out] Pointer to a buffer to receive the contents of the string pointed
to by the lpString2 parameter. The buffer must be large enough to
contain the string, including the terminating null character.
lpString2 [in] Pointer to the null-terminated string to be copied.
Return Values
If the function succeeds, the return value is a pointer to the buffer.
If the function fails, the return value is NULL.
--*/
LPWSTR
PALAPI
lstrcpyW(
OUT LPWSTR lpString1,
IN LPCWSTR lpString2)
{
LPWSTR lpStart = lpString1;
PERF_ENTRY(lstrcpyW);
ENTRY("lstrcpyW (lpString1=%p, lpString2=%p (%S))\n",
lpString1?lpString1:W16_NULLSTRING, lpString2?lpString2:W16_NULLSTRING, lpString2?lpString2:W16_NULLSTRING);
if (lpString1 == NULL)
{
ERROR("invalid lpString1 argument\n");
LOGEXIT("lstrcpyW returning LPWSTR NULL\n");
PERF_EXIT(lstrcpyW);
return NULL;
}
if (lpString2 == NULL)
{
ERROR("invalid lpString2 argument\n");
LOGEXIT("lstrcpyW returning LPWSTR NULL\n");
PERF_EXIT(lstrcpyW);
return NULL;
}
/* copy source string to destination string */
while(*lpString2)
{
*lpString1++ = *lpString2++;
}
/* add terminating null */
*lpString1 = '\0';
LOGEXIT("lstrcpyW returning LPWSTR %p (%S)\n", lpStart, lpStart);
PERF_EXIT(lstrcpyW);
return lpStart;
}
/*++
Function:
lstrlenA
The lstrlen function returns the length in bytes (ANSI version) or
characters (Unicode version) of the specified string (not including
the terminating null character).
Parameters
lpString [in] Pointer to a null-terminated string.
Return Values
The return value specifies the length of the string, in TCHARs. This
refers to bytes for ANSI versions of the function or characters for
Unicode versions.
--*/
int
PALAPI
lstrlenA( IN LPCSTR lpString)
{
int nChar = 0;
PERF_ENTRY(lstrlenA);
ENTRY("lstrlenA (lpString=%p (%s))\n", lpString?lpString:"NULL", lpString?lpString:"NULL");
if (lpString)
{
while (*lpString++)
{
nChar++;
}
}
LOGEXIT("lstrlenA returning int %d\n", nChar);
PERF_EXIT(lstrlenA);
return nChar;
}
/*++
Function:
lstrlenW
The lstrlen function returns the length in bytes (ANSI version) or
characters (Unicode version) of the specified string (not including
the terminating null character).
Parameters
lpString [in] Pointer to a null-terminated string.
Return Values
The return value specifies the length of the string, in TCHARs. This
refers to bytes for ANSI versions of the function or characters for
Unicode versions.
--*/
int
PALAPI
lstrlenW(
IN LPCWSTR lpString)
{
int nChar = 0;
PERF_ENTRY(lstrlenW);
ENTRY("lstrlenW (lpString=%p (%S))\n", lpString?lpString:W16_NULLSTRING, lpString?lpString:W16_NULLSTRING);
if (lpString != NULL)
{
while (*lpString++)
{
nChar++;
}
}
LOGEXIT("lstrlenW returning int %d\n", nChar);
PERF_EXIT(lstrlenW);
return nChar;
}
/*++
Function:
lstrcpynW
The lstrcpyn function copies a specified number of characters from a
source string into a buffer.
Parameters
lpString1 [out] Pointer to a buffer into which the function copies characters.
The buffer must be large enough to contain the number of TCHARs
specified by iMaxLength, including room for a terminating null character.
lpString2 [in] Pointer to a null-terminated string from which the function copies
characters.
iMaxLength [in] Specifies the number of TCHARs to be copied from the string pointed
to by lpString2 into the buffer pointed to by lpString1, including a
terminating null character.
Return Values
If the function succeeds, the return value is a pointer to the buffer.
If the function fails, the return value is NULL.
--*/
LPWSTR
PALAPI
lstrcpynW(
OUT LPWSTR lpString1,
IN LPCWSTR lpString2,
IN int iMaxLength)
{
LPWSTR lpStart = lpString1;
PERF_ENTRY(lstrcpynW);
ENTRY("lstrcpynW (lpString1=%p, lpString2=%p (%S), iMaxLength=%d)\n",
lpString1?lpString1:W16_NULLSTRING, lpString2?lpString2:W16_NULLSTRING, lpString2?lpString2:W16_NULLSTRING, iMaxLength);
if (lpString1 == NULL)
{
ERROR("invalid lpString1 argument\n");
LOGEXIT("lstrcpynW returning LPWSTR NULL\n");
PERF_EXIT(lstrcpynW);
return NULL;
}
if (lpString2 == NULL)
{
ERROR("invalid lpString2 argument\n");
LOGEXIT("lstrcpynW returning LPWSTR NULL\n");
PERF_EXIT(lstrcpynW);
return NULL;
}
/* copy source string to destination string */
while(iMaxLength > 1 && *lpString2)
{
*lpString1++ = *lpString2++;
iMaxLength--;
}
/* add terminating null */
if (iMaxLength > 0)
{
*lpString1 = '\0';
}
LOGEXIT("lstrcpynW returning LPWSTR %p (%S)\n", lpStart, lpStart);
PERF_EXIT(lstrcpynW);
return lpStart;
}
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