This file describes the implementation status and some notes; information is
taken from the C99 standard (ISO/IEC 9899:1999), section 7 ("Library").

Notes for implementers:

7.1.2§6:
  Use (extern) in all function prototypes
7.1.3§1:
  Only expose standard identifiers; anything else might be defined as a macro.
  Make sure every argument name, internal function name, etc. starts with
  either "__" or "_X" (where X is any uppercase letter)
7.1.4§1:
  Always give a function even if there is a macro definition, so that the
  address of the function can be taken; don't rely on the macro being defined,
  as the user can remove it except in some special cases

In this file, every definition is classified in one of several implementation
statuses. There are 5 stages that every definition should go through.

TODO:       Function/symbol/macro is not implemented/defined
BDEPS(...): Function/symbol/macro needs ... to build
LDEPS(...): Function/symbol/macro needs ... to link
TEST:       Function/symbol/macro needs to be tested
DONE:       Function/symbol/macro is defined, builds, links, and is tested

7.2 <assert.h>
    7.2.1 assert: LDEPS(fprintf,stderr,abort)

7.3 <complex.h>
    Provided by Lephenixnoir's port of OpenLibm.

7.4 <ctype.h>
    7.4.1 is*: DONE
    7.4.2 to*: DONE

7.5 <errno.h>
    7.5.2 EDOM EILSEQ ERANGE: DONE

7.6 <fenv.h>
    Provided by Lephenixnoir's port of OpenLibm.

7.7 <float.h>
    Provided by GCC.

7.8 <inttypes.h>
    7.8.1   PRI* macros: LDEPS(*printf)
    7.8.1   SCN* macros: LDEPS(*scanf)
    7.8.2.1 imaxabs: DONE
    7.8.2.2 imaxdiv: DONE
    7.8.2.3 strotimax strtoumax: TODO
    7.8.2.4 wcstoimax wcstoumax: TODO

7.9 <iso646.h>
    Provided by GCC.

7.10 <limits.h>
     Provided by GCC.

7.11 <locale.h>
     7.11.1 setlocale: TEST
     7.11.2 localeconv: TEST

     What if we wanted to support more locales?
     -> Need to a mechanism to supply the raw information, similar to the text
        files in /usr/share/i18n/locales
     -> Implement setlocale() and localeconv() properly (not hard)
     -> Probably support nl_langinfo(), which is much better than localeconv()
     -> Fix the "TODO: locale: ..." messages wherever assumptions on the locale
        are made in the code

7.12 <math.h>
     Provided by Lephenixnoir's port of OpenLibm.

7.13 <setjmp.h>
     7.13.1 setjmp: TEST
     7.13.2 longjmp: TEST

7.14 <signal.h>
     TODO: Difficult; the execution environment might not support signals

7.15 <stdarg.h>
     Provided by GCC.

7.16 <stdbool.h>
     Provided by GCC.

7.17 <stddef.h>
     Provided by GCC.

7.18 <stdint.h>
     Provided by GCC.

7.19 <stdio.h>
     TODO (will give the full list later on)

7.20 <stdlib.h>
     7.20.1.1  atof: TODO
     7.20.1.2  atoi, atol, atoll: DONE
     7.20.1.3  strtod, strtof, strtold: TODO
     7.20.1.4  strtol, strtoul, strtoll, strtoull: DONE
     7.20.2  Pseudo-random sequence generation functions: TODO
     7.20.3  Memory management functions: TODO (check existing code first)
     7.20.4  Communication with the environment: TODO
     7.20.5  Searching and sorting utilities: TODO
     7.20.6.1  abs, labs, llabs: DONE
     7.20.6.2  div, ldiv, lldiv: DONE
     7.20.7  Multibyte/wide character conversion functions: TODO
     7.20.8  Multibyte/wide string conversion functions: TODO

7.21 <string.h>
     TODO (will give the full list later on)

7.22 <tgmath.h>
     Provided by GCC.

7.23 <time.h>
     TODO (will give the full list later on)

7.24 <wchar.h>
     TODO (not a priority)

7.25 <wctype.h>
     TODO (not a priority)