* Related to the contents of the buffer
+`strbuf_trim`::
+
+ Strip whitespace from the beginning and end of a string.
+ Equivalent to performing `strbuf_rtrim()` followed by `strbuf_ltrim()`.
+
`strbuf_rtrim`::
Strip whitespace from the end of a string.
+`strbuf_ltrim`::
+
+ Strip whitespace from the beginning of a string.
+
+`strbuf_tolower`::
+
+ Lowercase each character in the buffer using `tolower`.
+
`strbuf_cmp`::
Compare two buffers. Returns an integer less than, equal to, or greater
destination. This is useful for literal data to be fed to either
strbuf_expand or to the *printf family of functions.
+`strbuf_humanise_bytes`::
+
+ Append the given byte size as a human-readable string (i.e. 12.23 KiB,
+ 3.50 MiB).
+
`strbuf_addf`::
Add a formatted string to the buffer.