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My biggest gripe with your code is the (almost) complete lack of comments!  Nothing gives even a brief overview of what this library is supposed to do, and we are left to guess what the subroutines do from their names only.

By the way, if you want strings that can automatically grow and shrink as needed at run time, you are welcome to use my <a href="https://github.com/EmbedInc/strflex">STRFLEX</a> library and/or its code as you see fit, with the only restriction being proper attribution.  I use these strings when they need to arbitrarily grow, like in my <a href="http://www.embedinc.com/pic/escr">ESCR</a> interpreter and pre-processor.

For strings with fixed maximum length, I use my <a href="https://github.com/EmbedInc/string">STRING</a> library.  Both the current length and maximum storage length are kept for each string.  That gets around many of the problems with C strings.  The library contains a rather extensive set of string manipulation capabilities, including quite flexible string to/from number conversions.