lib: Add str_is_float check function

lib: Added str_to_ino()

strnum: Implemented many more numeric string parsing functions. Created macros for most of the implementation to avoid further code duplication.

lib: strnum - add permissive str_parse_uint() helper Signed-off-by: Phil Carmody <phil@dovecot.fi>

lib: strnum - add a permissive uoff_t parser Functions like these are so cookie-cutter, we may as well use a macro. Note that signed helpers, if they ever appear, will need more care. Signed-off-by: Phil Carmody <phil@dovecot.fi>

lib: strnum - add permissive partial-string integer parser Not all strings we want to parse are already strtok'ed into separate pieces. Therefore add helpers which will read the integer, and return a pointer past the parsed integer. The previous helpers can be considered a special case which just follows up with a check that the '\0' has been reached. Showing a preference for const pointers generally, this does not try to mimic the non-const interface of strto{l,ul,ll,ull}(). Signed-off-by: Phil Carmody <phil@dovecot.fi>

liblib: Added str_to_time()

Added str_to_*() for converting strings to numbers, plus a few helper functions. The str_to_*() return failure also if integer is too large or too small to fit into destination. --HG-- branch : HEAD