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MdePkg/BaseLib: Add more comments for safe string functions.

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Add more comments:
1) EDKII version safe string function is similar as the one C11.
2) If error is returned, the Destination is unmodified.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
This commit is contained in:
Jiewen Yao 2016-05-22 21:01:37 +08:00
parent e6877b56b2
commit 328f84b156
2 changed files with 72 additions and 0 deletions
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36
MdePkg/Include/Library/BaseLib.h
View File

@ -187,6 +187,8 @@ typedef struct {
/** /**
Returns the length of a Null-terminated Unicode string. Returns the length of a Null-terminated Unicode string.
This function is similar as strlen_s defined in C11.
If String is not aligned on a 16-bit boundary, then ASSERT(). If String is not aligned on a 16-bit boundary, then ASSERT().
@param String A pointer to a Null-terminated Unicode string. @param String A pointer to a Null-terminated Unicode string.
@ -209,10 +211,14 @@ StrnLenS (
Copies the string pointed to by Source (including the terminating null char) Copies the string pointed to by Source (including the terminating null char)
to the array pointed to by Destination. to the array pointed to by Destination.
This function is similar as strcpy_s defined in C11.
If Destination is not aligned on a 16-bit boundary, then ASSERT(). If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT(). If Source is not aligned on a 16-bit boundary, then ASSERT().
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string. @param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode @param DestMax The maximum number of Destination Unicode
char, including terminating null char. char, including terminating null char.
@ -241,10 +247,14 @@ StrCpyS (
Source to the array pointed to by Destination. If no null char is copied from Source to the array pointed to by Destination. If no null char is copied from
Source, then Destination[Length] is always set to null. Source, then Destination[Length] is always set to null.
This function is similar as strncpy_s defined in C11.
If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT(). If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT().
If Length > 0 and Source is not aligned on a 16-bit boundary, then ASSERT(). If Length > 0 and Source is not aligned on a 16-bit boundary, then ASSERT().
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string. @param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode @param DestMax The maximum number of Destination Unicode
char, including terminating null char. char, including terminating null char.
@ -275,10 +285,14 @@ StrnCpyS (
Appends a copy of the string pointed to by Source (including the terminating Appends a copy of the string pointed to by Source (including the terminating
null char) to the end of the string pointed to by Destination. null char) to the end of the string pointed to by Destination.
This function is similar as strcat_s defined in C11.
If Destination is not aligned on a 16-bit boundary, then ASSERT(). If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT(). If Source is not aligned on a 16-bit boundary, then ASSERT().
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string. @param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode @param DestMax The maximum number of Destination Unicode
char, including terminating null char. char, including terminating null char.
@ -311,10 +325,14 @@ StrCatS (
copied from Source, then Destination[StrLen(Destination) + Length] is always copied from Source, then Destination[StrLen(Destination) + Length] is always
set to null. set to null.
This function is similar as strncat_s defined in C11.
If Destination is not aligned on a 16-bit boundary, then ASSERT(). If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT(). If Source is not aligned on a 16-bit boundary, then ASSERT().
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string. @param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode @param DestMax The maximum number of Destination Unicode
char, including terminating null char. char, including terminating null char.
@ -346,6 +364,8 @@ StrnCatS (
/** /**
Returns the length of a Null-terminated Ascii string. Returns the length of a Null-terminated Ascii string.
This function is similar as strlen_s defined in C11.
@param String A pointer to a Null-terminated Ascii string. @param String A pointer to a Null-terminated Ascii string.
@param MaxSize The maximum number of Destination Ascii @param MaxSize The maximum number of Destination Ascii
char, including terminating null char. char, including terminating null char.
@ -366,8 +386,12 @@ AsciiStrnLenS (
Copies the string pointed to by Source (including the terminating null char) Copies the string pointed to by Source (including the terminating null char)
to the array pointed to by Destination. to the array pointed to by Destination.
This function is similar as strcpy_s defined in C11.
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string. @param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii @param DestMax The maximum number of Destination Ascii
char, including terminating null char. char, including terminating null char.
@ -396,8 +420,12 @@ AsciiStrCpyS (
Source to the array pointed to by Destination. If no null char is copied from Source to the array pointed to by Destination. If no null char is copied from
Source, then Destination[Length] is always set to null. Source, then Destination[Length] is always set to null.
This function is similar as strncpy_s defined in C11.
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string. @param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii @param DestMax The maximum number of Destination Ascii
char, including terminating null char. char, including terminating null char.
@ -428,8 +456,12 @@ AsciiStrnCpyS (
Appends a copy of the string pointed to by Source (including the terminating Appends a copy of the string pointed to by Source (including the terminating
null char) to the end of the string pointed to by Destination. null char) to the end of the string pointed to by Destination.
This function is similar as strcat_s defined in C11.
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string. @param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii @param DestMax The maximum number of Destination Ascii
char, including terminating null char. char, including terminating null char.
@ -462,8 +494,12 @@ AsciiStrCatS (
copied from Source, then Destination[StrLen(Destination) + Length] is always copied from Source, then Destination[StrLen(Destination) + Length] is always
set to null. set to null.
This function is similar as strncat_s defined in C11.
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string. @param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii @param DestMax The maximum number of Destination Ascii
char, including terminating null char. char, including terminating null char.

36
MdePkg/Library/BaseLib/SafeString.c
View File

@ -106,6 +106,8 @@ InternalSafeStringNoAsciiStrOverlap (
/** /**
Returns the length of a Null-terminated Unicode string. Returns the length of a Null-terminated Unicode string.
This function is similar as strlen_s defined in C11.
If String is not aligned on a 16-bit boundary, then ASSERT(). If String is not aligned on a 16-bit boundary, then ASSERT().
@param String A pointer to a Null-terminated Unicode string. @param String A pointer to a Null-terminated Unicode string.
@ -151,10 +153,14 @@ StrnLenS (
Copies the string pointed to by Source (including the terminating null char) Copies the string pointed to by Source (including the terminating null char)
to the array pointed to by Destination. to the array pointed to by Destination.
This function is similar as strcpy_s defined in C11.
If Destination is not aligned on a 16-bit boundary, then ASSERT(). If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT(). If Source is not aligned on a 16-bit boundary, then ASSERT().
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string. @param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode @param DestMax The maximum number of Destination Unicode
char, including terminating null char. char, including terminating null char.
@ -229,10 +235,14 @@ StrCpyS (
Source to the array pointed to by Destination. If no null char is copied from Source to the array pointed to by Destination. If no null char is copied from
Source, then Destination[Length] is always set to null. Source, then Destination[Length] is always set to null.
This function is similar as strncpy_s defined in C11.
If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT(). If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT().
If Length > 0 and Source is not aligned on a 16-bit boundary, then ASSERT(). If Length > 0 and Source is not aligned on a 16-bit boundary, then ASSERT().
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string. @param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode @param DestMax The maximum number of Destination Unicode
char, including terminating null char. char, including terminating null char.
@ -318,10 +328,14 @@ StrnCpyS (
Appends a copy of the string pointed to by Source (including the terminating Appends a copy of the string pointed to by Source (including the terminating
null char) to the end of the string pointed to by Destination. null char) to the end of the string pointed to by Destination.
This function is similar as strcat_s defined in C11.
If Destination is not aligned on a 16-bit boundary, then ASSERT(). If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT(). If Source is not aligned on a 16-bit boundary, then ASSERT().
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string. @param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode @param DestMax The maximum number of Destination Unicode
char, including terminating null char. char, including terminating null char.
@ -415,10 +429,14 @@ StrCatS (
copied from Source, then Destination[StrLen(Destination) + Length] is always copied from Source, then Destination[StrLen(Destination) + Length] is always
set to null. set to null.
This function is similar as strncat_s defined in C11.
If Destination is not aligned on a 16-bit boundary, then ASSERT(). If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT(). If Source is not aligned on a 16-bit boundary, then ASSERT().
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Unicode string. @param Destination A pointer to a Null-terminated Unicode string.
@param DestMax The maximum number of Destination Unicode @param DestMax The maximum number of Destination Unicode
char, including terminating null char. char, including terminating null char.
@ -520,6 +538,8 @@ StrnCatS (
/** /**
Returns the length of a Null-terminated Ascii string. Returns the length of a Null-terminated Ascii string.
This function is similar as strlen_s defined in C11.
@param String A pointer to a Null-terminated Ascii string. @param String A pointer to a Null-terminated Ascii string.
@param MaxSize The maximum number of Destination Ascii @param MaxSize The maximum number of Destination Ascii
char, including terminating null char. char, including terminating null char.
@ -561,8 +581,12 @@ AsciiStrnLenS (
Copies the string pointed to by Source (including the terminating null char) Copies the string pointed to by Source (including the terminating null char)
to the array pointed to by Destination. to the array pointed to by Destination.
This function is similar as strcpy_s defined in C11.
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string. @param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii @param DestMax The maximum number of Destination Ascii
char, including terminating null char. char, including terminating null char.
@ -634,8 +658,12 @@ AsciiStrCpyS (
Source to the array pointed to by Destination. If no null char is copied from Source to the array pointed to by Destination. If no null char is copied from
Source, then Destination[Length] is always set to null. Source, then Destination[Length] is always set to null.
This function is similar as strncpy_s defined in C11.
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string. @param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii @param DestMax The maximum number of Destination Ascii
char, including terminating null char. char, including terminating null char.
@ -718,8 +746,12 @@ AsciiStrnCpyS (
Appends a copy of the string pointed to by Source (including the terminating Appends a copy of the string pointed to by Source (including the terminating
null char) to the end of the string pointed to by Destination. null char) to the end of the string pointed to by Destination.
This function is similar as strcat_s defined in C11.
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string. @param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii @param DestMax The maximum number of Destination Ascii
char, including terminating null char. char, including terminating null char.
@ -810,8 +842,12 @@ AsciiStrCatS (
copied from Source, then Destination[StrLen(Destination) + Length] is always copied from Source, then Destination[StrLen(Destination) + Length] is always
set to null. set to null.
This function is similar as strncat_s defined in C11.
If an error would be returned, then the function will also ASSERT(). If an error would be returned, then the function will also ASSERT().
If an error is returned, then the Destination is unmodified.
@param Destination A pointer to a Null-terminated Ascii string. @param Destination A pointer to a Null-terminated Ascii string.
@param DestMax The maximum number of Destination Ascii @param DestMax The maximum number of Destination Ascii
char, including terminating null char. char, including terminating null char.