Runtime Library (RtlR0.h)

TwinCAT has its own implementation of the runtime library. These functions are declared in RtlR0.h, a part of TwinCAT SDK.

Methods provided

Name	Description
abs	Calculates the absolute value.
atof	Converts a string (char *buf) into a double.
BitScanForward	Searches for a set bit (1) from LSB to MSB.
BitScanReverse	Searches for a set bit (1) from MSB to LSB.
labs	Calculates the absolute value.
memcmp	Compares two buffers.
memcpy	Copies one buffer into another.
memcpy_byte	Copies one buffer into another (bytewise).
memset	Sets the bytes of a buffer to a value.
qsort	QuickSort for sorting a list.
snprintf	Writes formatted data into a character string.
sprintf	Writes formatted data into a character string.
sscanf	Reads data from a character string after specification of a format.
strcat	Appends one character string to another.
strchr	Searches for a character in a character string.
strcmp	Compares two character strings.
strcpy	Copies a character string.
strlen	Determines the length of a character string.
strncat	Appends one character string to another.
strncmp	Compares two character strings.
strncpy	Copies a character string.
strstr	Searches for a character string within a character string.
strtol	Converts a character string into an integer.
strtoul	Converts a character string into an unsigned integer.
swscanf	Reads data from a character string after specification of a format.
tolower	Converts a letter into a lower-case letter.
toupper	Converts a letter into an upper-case letter.
vsnprintf	Writes formatted data into a character string ('\0' scheduling).
vsprintf	Writes formatted data into a character string.

All functions are based on the C++ runtime library.