Mercurial > hg > ucx / file diff

--- a/docs/src/modules.md	Wed May 02 18:47:22 2018 +0200
+++ b/docs/src/modules.md	Wed May 02 19:16:58 2018 +0200
@@ -294,4 +294,29 @@
 }
 ```
 
+### Automatic allocation for formatted strings
 
+The UCX utility function `ucx_asprintf()` and it's convenient shortcut
+`ucx_sprintf` allow easy formatting of strings, without ever having to worry
+about the required space.
+```C
+sstr_t mystring = ucx_sprintf("The answer is: %d!", 42);
+```
+Still, you have to pass `mystring.ptr` to `free()` (or the free function of
+your allocator, if you use `ucx_asprintf`).
+If you don't have all the information ready to build your string, you can even
+use a [UcxBuffer](#buffer) as a target with the utility function
+`ucx_bprintf()`.
+```C
+UcxBuffer* strbuffer = ucx_buffer_new(NULL, 512, UCX_BUFFER_AUTOEXTEND);
+
+for (unsigned int i = 2 ; i < 100 ; i++) {
+        ucx_bprintf(strbuffer, "Integer %d is %s\n",
+                        i, prime(i) ? "prime" : "not prime");
+}
+
+// print the result to stdout
+printf("%s", (char*)strbuffer->space);
+
+ucx_buffer_free(strbuffer);
+```