string functions

strlens(s0

returns length of s
strcpy(s1,s2)

copy s2 into s1
strcat(s1,s2)

concat (append) s2 to the end of s1
strcmp(s1,s2)

0 if s1==s2,<0 if s1<s2, >0 if s1>s2
strchr(s,c)

returns a pointer to c in s, else NULL
strncpy(s1,s2,n)

copy up to n characters from s2 into s1
strncats(s1,s2,n)

concat up to n chars from s2 to end of s1
strncmps(s1,s2,n)

compare n characters, same as strcmp0