strbcmp, strbcpy, strzcpy - perform string operations
strbcmp (s1, s2, n)
strbcpy (s1, s2, n)
strzcpy (s1, s2, n)
Strbcmp compares two strings either of which can be either
nullterminated or blank padded. Strbcmp returns an integer
greater than, equal to or less than 0 according to whether s1 is
lexicographically greater than, equal to or less than s2. Strbcmp
compares at most n bytes. If either string is null-terminated,
that string is treated as if it were blank padded for the
purposes of comparison. This function is roughly equivalent to
strncmp but is designed to also handle blank padded strings that
do not have null byte terminators.
Strbcpy copies n bytes from s2 to s1. If the source string s2 is
less than n bytes, the destination string s1 is blank filled. In
no case is a null terminator added to the destination string.
This function is roughly equivalent to strncpy, but it pads
strings with blanks rather than nulls.
Strzcpy copies a blank padded or null terminated string
converting it to a string that is null terminated. It copies at
most n bytes from s2 to s1 and converts any trailing blanks to
nulls. A null terminator is always added to the destination
string. This function is roughly equivalent to strncpy, but it
strips trailing blanks from the source string and always
guarantees that there is a null terminator on the destination
string. It is intended for converting blank padded strings to
null terminated strings.
Strbcpy and strzcpy do not check for overflow of the receiving
string. Strbcpy needs n bytes, and strzcpy needs at most n+1
Strbcmp uses native character comparison that is signed on PDP
11's and may be either signed or unsigned on other machines.