functions to lock and unlock pages (3.4.3 p76) character class determination for wide characters (4.3 p82) collation functions (5.6 p109) encode binary data (5.11 p125) argz and envz vectors (5.12 p127) characer-set handling (6 p133) locales and internationalisation (7 p181) mathematics (8 p243) arithmetic functions (9 p243) date and time (10 p277) message translation (11 p315) searching and sorting (12 p343) pattern matching (13 p355) the basic program–system interface (14 p379) input/output overview (15 p429) input/output on streams (17 p439) It should be possible to configure malloc, calloc, and realloc to allocate some extra space. This is usable for single-threaded allocations; they do not need to realloc strings returned by functions with __attribute__((malloc)), to append a string or character. LOW PRIORITY: debugging support (16 p435) _GNU_SOURCE, system-dependant void* extalloca(void* p, size_t extent) :: extend alloca-allocation requires that nothing has been allocated to the stack since p. difficult to implement as a function. as a macro: ({ void* q = alloca(extent); (long int)q < (long int)p ? q : p; }) void* dealloca(size_t amount) deallocate the last amount bytes allocated to the stack void* zalloca(size_t size) difficult to implement as a function. as a macro: ({ void* p = alloca(size); memset(p, 0, size); }) crt0 with cpu cycle count printing BUFSIZ configurable by environment variable Rate limitation of I/O-functions configured by environment variables configuration: unlink = shred if st_nlink=1 The width of intptr_t should be determined by sizeof(void*), the width of size_t should be determined by sizeof(sizeof(0)), and the width of ptrdiff_t should be determined by sizeof(NULL - NULL); libslibc library with all slibc-extension. Extensions: mkdir -p Variable argument max and min base64 base64 -d base16 base16 -d variable argument string concat string manipulation POSIX specifies that *printf shall fail with EOVERFLOW is the length of the constructed string is greater than INT_MAX. We shall follow this, but it should optional to truncate the value to INT_MAX. Programs should not have to limit the resulting string to 32765 bytes! Can we implement any of these: http://www.gnu.org/fun/jokes/errno.2