Character string functions

These functions are more secure versions of several of the character string functions available in the standard C run-time library. More...

Functions
EXTERNRT int	rtxStricmp (const char *str1, const char *str2)
	This is an implementation of the non-standard stricmp function.
EXTERNRT char *	rtxStrcat (char *dest, size_t bufsiz, const char *src)
	This function concatanates the given string onto the string buffer.
EXTERNRT char *	rtxStrncat (char *dest, size_t bufsiz, const char *src, size_t nchars)
	This function concatanates the given number of characters from the given string onto the string buffer.
EXTERNRT char *	rtxStrcpy (char *dest, size_t bufsiz, const char *src)
	This function copies a null-terminated string to a target buffer.
EXTERNRT char *	rtxStrncpy (char *dest, size_t bufsiz, const char *src, size_t nchars)
	This function copies the given number of characters from a string to a target buffer.
EXTERNRT char *	rtxStrdup (OSCTXT *pctxt, const char *src)
	This function creates a duplicate copy of a null-terminated string.
EXTERNRT const char *	rtxStrJoin (char *dest, size_t bufsiz, const char *str1, const char *str2, const char *str3, const char *str4, const char *str5)
	This function concatanates up to five substrings together into a single string.
EXTERNRT const char *	rtxStrDynJoin (OSCTXT *pctxt, const char *str1, const char *str2, const char *str3, const char *str4, const char *str5)
	This function allocates memory for and concatanates up to five substrings together into a single string.
EXTERNRT int	rtxIntToCharStr (OSINT32 value, char *dest, size_t bufsiz, char padchar)
	This function converts a signed 32-bit integer into a character string.
EXTERNRT int	rtxUIntToCharStr (OSUINT32 value, char *dest, size_t bufsiz, char padchar)
	This function converts an unsigned 32-bit integer into a character string.
EXTERNRT int	rtxInt64ToCharStr (OSINT64 value, char *dest, size_t bufsiz, char padchar)
	This function converts a signed 64-bit integer into a character string.
EXTERNRT int	rtxUInt64ToCharStr (OSUINT64 value, char *dest, size_t bufsiz, char padchar)
	This function converts an unsigned 64-bit integer into a character string.
EXTERNRT int	rtxSizeToCharStr (size_t value, char *dest, size_t bufsiz, char padchar)
	This function converts a value of type 'size_t' into a character string.
EXTERNRT int	rtxHexCharsToBinCount (const char *hexstr, size_t nchars)
	This function returns a count of the number of bytes the would result from the conversion of a hexadecimal character string to binary.
EXTERNRT int	rtxHexCharsToBin (const char *hexstr, size_t nchars, OSOCTET *binbuf, size_t bufsize)
	This function converts the given hex string to binary.
EXTERNRT int	rtxCharStrToInt (const char *cstr, OSINT32 *pvalue)
	This function converts the given character string to an integer value.

---

Detailed Description

These functions are more secure versions of several of the character string functions available in the standard C run-time library.

---

Function Documentation

EXTERNRT int rtxCharStrToInt	(	const char *	cstr,
		OSINT32 *	pvalue
	)

This function converts the given character string to an integer value.

It consumes all leading whitespace before the digits start. It then comsumes digits until a non-digit character is encountered.

Parameters:

	cstr	Character string to convert.
	pvalue	Pointer to integer value to receive converted data.

Returns:

Number of bytes or negative status value if fail.

EXTERNRT int rtxHexCharsToBin	(	const char *	hexstr,
		size_t	nchars,
		OSOCTET *	binbuf,
		size_t	bufsize
	)

This function converts the given hex string to binary.

The result is stored in the given binary buffer. Any whitespace characters in the string are ignored.

Parameters:

	hexstr	Hex character string to convert.
	nchars	Number of characters in string. If zero, characters are read up to null-terminator.
	binbuf	Buffer to hold converted binary data.
	bufsize	Size of the binary data buffer.

Returns:

Number of bytes or negative status value if fail.

EXTERNRT int rtxHexCharsToBinCount	(	const char *	hexstr,
		size_t	nchars
	)

This function returns a count of the number of bytes the would result from the conversion of a hexadecimal character string to binary.

Any whitespace characters in the string are ignored.

Parameters:

	hexstr	Hex character string to convert.
	nchars	Number of characters in string. If zero, characters are read up to null-terminator.

Returns:

Number of bytes or negative status value if fail.

EXTERNRT int rtxInt64ToCharStr	(	OSINT64	value,
		char *	dest,
		size_t	bufsiz,
		char	padchar
	)

This function converts a signed 64-bit integer into a character string.

It is similar to the C itoa function.

Parameters:

	value	Integer to convert.
	dest	Pointer to destination buffer to receive string.
	bufsiz	Size of the destination buffer.
	padchar	Left pad char, set to zero for no padding.

Returns:

Number of characters or negative status value if fail.

EXTERNRT int rtxIntToCharStr	(	OSINT32	value,
		char *	dest,
		size_t	bufsiz,
		char	padchar
	)

This function converts a signed 32-bit integer into a character string.

It is similar to the C itoa function.

Parameters:

	value	Integer to convert.
	dest	Pointer to destination buffer to receive string.
	bufsiz	Size of the destination buffer.
	padchar	Left pad char, set to zero for no padding.

Returns:

Number of characters or negative status value if fail.

EXTERNRT int rtxSizeToCharStr	(	size_t	value,
		char *	dest,
		size_t	bufsiz,
		char	padchar
	)

This function converts a value of type 'size_t' into a character string.

It is similar to the C itoa function.

Parameters:

	value	Size value to convert.
	dest	Pointer to destination buffer to receive string.
	bufsiz	Size of the destination buffer.
	padchar	Left pad char, set to zero for no padding.

Returns:

Number of characters or negative status value if fail.

EXTERNRT char* rtxStrcat	(	char *	dest,
		size_t	bufsiz,
		const char *	src
	)

This function concatanates the given string onto the string buffer.

It is similar to the C strcat function except more secure because it checks for buffer overrun.

Parameters:

	dest	Pointer to destination buffer to receive string.
	bufsiz	Size of the destination buffer.
	src	Pointer to null-terminated string to copy.

Returns:

Pointer to destination buffer or NULL if copy failed.

EXTERNRT char* rtxStrcpy	(	char *	dest,
		size_t	bufsiz,
		const char *	src
	)

This function copies a null-terminated string to a target buffer.

It is similar to the C strcpy function except more secure because it checks for buffer overrun.

Parameters:

	dest	Pointer to destination buffer to receive string.
	bufsiz	Size of the destination buffer.
	src	Pointer to null-terminated string to copy.

Returns:

Pointer to destination buffer or NULL if copy failed.

EXTERNRT char* rtxStrdup	(	OSCTXT *	pctxt,
		const char *	src
	)

This function creates a duplicate copy of a null-terminated string.

Memory is allocated for the target string using the rtxMemAlloc function. The string is then copied into this memory block. It is similar to the C strdup function except more secure because it checks for buffer overrun.

Parameters:

	pctxt	Pointer to a standard context structure.
	src	Pointer to null-terminated string to copy.

Returns:

Pointer to destination buffer or NULL if copy failed.

EXTERNRT const char* rtxStrDynJoin	(	OSCTXT *	pctxt,
		const char *	str1,
		const char *	str2,
		const char *	str3,
		const char *	str4,
		const char *	str5
	)

This function allocates memory for and concatanates up to five substrings together into a single string.

Parameters:

	pctxt	Pointer to a standard context structure.
	str1	Pointer to substring to join.
	str2	Pointer to substring to join.
	str3	Pointer to substring to join.
	str4	Pointer to substring to join.
	str5	Pointer to substring to join.

Returns:

Composite string consisting of all parts.

EXTERNRT int rtxStricmp	(	const char *	str1,
		const char *	str2
	)

This is an implementation of the non-standard stricmp function.

It does not check for greater than/less than however, only for equality.

Parameters:

	str1	Pointer to first string to compare.
	str2	Pointer to second string to compare.

Returns:

0 if strings are equal, non-zero if not.

EXTERNRT const char* rtxStrJoin	(	char *	dest,
		size_t	bufsiz,
		const char *	str1,
		const char *	str2,
		const char *	str3,
		const char *	str4,
		const char *	str5
	)

This function concatanates up to five substrings together into a single string.

Parameters:

	dest	Pointer to destination buffer to receive string.
	bufsiz	Size of the destination buffer.
	str1	Pointer to substring to join.
	str2	Pointer to substring to join.
	str3	Pointer to substring to join.
	str4	Pointer to substring to join.
	str5	Pointer to substring to join.

Returns:

Composite string consisting of all parts.

EXTERNRT char* rtxStrncat	(	char *	dest,
		size_t	bufsiz,
		const char *	src,
		size_t	nchars
	)

This function concatanates the given number of characters from the given string onto the string buffer.

It is similar to the C strncat function except more secure because it checks for buffer overrun.

Parameters:

	dest	Pointer to destination buffer to receive string.
	bufsiz	Size of the destination buffer.
	src	Pointer to null-terminated string to copy.
	nchars	Number of characters to copy.

Returns:

Pointer to destination buffer or NULL if copy failed.

EXTERNRT char* rtxStrncpy	(	char *	dest,
		size_t	bufsiz,
		const char *	src,
		size_t	nchars
	)

This function copies the given number of characters from a string to a target buffer.

It is similar to the C strncpy function except more secure because it checks for buffer overrun and ensures a null-terminator is copied to the end of the target buffer. If the target buffer is too short to hold the null terminator, the last character is overwritten and a null pointer is returned; the destination buffer can still be examined in this case.

Parameters:

	dest	Pointer to destination buffer to receive string.
	bufsiz	Size of the destination buffer.
	src	Pointer to null-terminated string to copy.
	nchars	Number of characters to copy.

Returns:

Pointer to destination buffer or NULL if copy failed.

EXTERNRT int rtxUInt64ToCharStr	(	OSUINT64	value,
		char *	dest,
		size_t	bufsiz,
		char	padchar
	)

This function converts an unsigned 64-bit integer into a character string.

It is similar to the C itoa function.

Parameters:

	value	Integer to convert.
	dest	Pointer to destination buffer to receive string.
	bufsiz	Size of the destination buffer.
	padchar	Left pad char, set to zero for no padding.

Returns:

Number of characters or negative status value if fail.

EXTERNRT int rtxUIntToCharStr	(	OSUINT32	value,
		char *	dest,
		size_t	bufsiz,
		char	padchar
	)

This function converts an unsigned 32-bit integer into a character string.

It is similar to the C itoa function.

Parameters:

	value	Integer to convert.
	dest	Pointer to destination buffer to receive string.
	bufsiz	Size of the destination buffer.
	padchar	Left pad char, set to zero for no padding.

Returns:

Number of characters or negative status value if fail.