add to readme

[libcext.git] / README.md

diff --git a/README.md b/README.md
index 46ea40c2336230ebc9219165f636fda5a8a6470e..762d93f9480be66c2ebaeed8b9723b1988440cab 100644 (file)
--- a/README.md
+++ b/README.md
@@ -1,4 +1,6 @@
-A (WIP) collection of portable, (mostly) strict C99, single-header implementations of common libc extensions.
+A (WIP) collection of portable, strict C99, single-header implementations of common libc extensions.
+
+All functions are implemented as macros expanding to an internal function reference, this allows to use the headers with no meta build system - it compiles even if the extensions are already present, see _How to_ on disabling this behaviour.
 
 ### How to
 
@@ -21,21 +23,39 @@ By default, the header won't have any stdlib includes, change that with:
 #define <EXT-FUNC-NAME>_INCLUDE_LIBC
 ```
 
-Or disable function override with:
+Or disable function, type and variable override with:
 
 ```
 #define HAVE_<EXT-FUNC-NAME>
 ```
 
-## Specifics
+### Specifics
+
+---
+
+### asprintf
+
+includes `vasprintf()` and `asprintf()`
+
+---
 
 ### getopt\_long
 
+includes `getopt()`, `getsubopt()`, `getopt_long()` and `getopt_long_only()`
+
 `getopt_long.h` has additional macros related to argument
-permuting, defining those enables it (GNU behaviour):
+permuting, defining those enables it per function (GNU behaviour, can still be disabled at runtime by setting `$POSIXLY_CORRECT`):
 
 ```
 #define GETOPT_PERMUTE_ARGS
 #define GETOPT_LONG_PERMUTE_ARGS
 #define GETOPT_LONG_ONLY_PERMUTE_ARGS
 ```
+
+---
+
+### strlcat
+
+includes `strlcat()` and `estrlcat()`
+
+---