libsimple.h includes most POSIX header files so you do need to include lots of
headers in your code, and defines macros and functions that are useful for most
programs and libraries to simplify the code. It also provides *_MIN and *_MAX
values for integer data types.

All functions are namespaced with `libsimple_` and aliased with macro
definitions to unnamespaced names unless there already is a macro with that
name. However, some functions are seen as libsimple specific and do not
have unnamespaced.

Programs using this library should define `char *argv0` and set it to
the 0:th command line argument.

libsimple include a number of functions complementing those in <string.h>
and <strings.h>, the naming scheme of these functions is:

	<base> = str		for NUL-terminated byte strings
	       = strn		for byte strings that may not be NUL-terminated
	       = mem		for byte arrays
	       = wcs		for NUL-terminated wide-character strings
	       = wcsn		for wide-character strings that may not be NUL-terminated
	       = wmem		for wide-character arrays

	<str>  = str		if <base> is str, wcs, strn, or wcsn
	       = mem		if <base> is mem or wmem

	<scan> = chrnul		if <base> is str, wcs, strn, or wcsn
	       = scan		if <base> is mem or wmem

	[case] = 		if case-sensitive
	       = case		if case-insensitive, the name may also end with
					_l if there is a locale parameter

	[_inv] = 		for normal search
	       = _inv		for search of anything else (skipping)

	[r]    =                for left-to-right search/comparison
	       = r              for right-to-left search/comparison

	[p]    = 		return beginning of destination
	       = p		return end of destination

	[raw]  = 		sought data may not exist
	       = raw		sought data does exist (only <base> = mem, wmem)

	<base>[r] = strrn	if <base> is strn
	          = wcsrn	if <base> is wcsn
		  = <base>r	otherwise

	<base>[p] = stp		if <base> is str
	          = stpn	if <base> is strn
	          = wcp		if <base> is wcs
	          = wcpn	if <base> is wcsn
		  = <base>p	otherwise

	[raw]<base>[r][case]chr[_inv]	find character
	<base>[case]<scan>[_inv]	find character or end
	<base>[r][case]<str>		find substring
	<base>[case]cmp			alphabetically compare, without NULL support
	<base>[case]cmpnul		alphabetically compare, with NULL support
	<base>[case]ends		verify end
	<base>[case]starts		verify beginning
	<base>[case]eq			!<base>[case]cmp
	<base>[case]eqnul		!<base>[case]cmpnul
	<base>[r][case]eqlen		check length of commonality
	<base>end			find end of string (not <base> = mem, wmem)
	<base>[p]cpy			copy data (to external array)
	<base>[p]move			move data (within array or to external array)
	<base>[p]set			fill data
	<base>[p]toupper		like <base>[p]move but convert text to upper case
	<base>[p]tolower		like <base>[p]move but convert text to lower case
	[raw]<base>ccpy			like <base>pcpy, but stop after a character is found
	[raw]<base>cmove		like <base>pmove, but stop after a character is found
	<base>replace			replace all instance of a character, end is returned
	mem[p]setelem			fill data with elements of custom length
	[raw]mem[r]elem[_inv]		find element with custom length
	memelemscan[_inv]		find element with custom length or end
	memreplaceelem			replace all instance of an element of custom length, end is returned