nits + update readme

Makefile

@@ -2,7 +2,7 @@ build::
 	rm -rf cureq cureq.h
 	cargo build
 	cbindgen --lang c --output cureq.h
-	cc cureq.c -L./target/debug -lcureq -o cureq
+	cc -O3 -Wall cureq.c -L./target/debug -lcureq -o cureq
 
 run:: build
 	./cureq

README.md

@@ -1,28 +1,45 @@
 # cureq
 
-Small C wrapper for [ureq](https://crates.io/crates/ureq).
+Small C wrapper for [ureq](https://crates.io/crates/ureq). Outputs a static lib that can be versy easily linked to a C project.
 
 Example usage:
 ```c
-const char *header0[] = {"name0", "value0"};
-const char *const *headers[] = {header0};
-int headers_cnt = 1;
-
-char buffer[5000];
-int read_bytes = 0;
-int status = cureq_call("GET", url, headers_cnt, 1, buffer, sizeof(buffer), &read_bytes, NULL, 0);
-if (status == -1) {
-    fprintf(stderr, "Error fetching content!\n");
-}
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "./cureq.h"
+
+int main() {
+    unsigned char buffer[5000];
+    char *url = "https://httpbin.org/anything";
+    char *method = "POST";
+    char *payload = "some payload";
+    int payload_len = strlen(payload);
+
+    const char *header0[] = {"name0", "value0"};
+    const char *const *headers[] = {header0};
+    int headers_count = 1;
+
+    fprintf(stderr, "Making a %s request to %s\n", method, url);
+    fprintf(stderr, "====================\n");
 
-fprintf(stderr, "=> Status code: %d\n", status);
-fprintf(stderr, "=> Response: %s\n", buffer);
+    int read_bytes = 0;
+    int status = cureq_call(method, url, headers, headers_count, buffer, sizeof(buffer), &read_bytes, (unsigned char *) payload, payload_len);
+    if (status == -1) {
+        fprintf(stderr, "Error fetching content!\n");
+        return 1;
+    }
+
+    fprintf(stderr, "=> Status code: %d\n", status);
+    fprintf(stderr, "=> Response: %s\n", buffer);
+    return 0;
+}
 ```
 
 Prototype:
 ```c
 /**
- * Perform a HTTP request
+ * Perform a request to the given URL
  *
  * @fn ureq_get
  *
@@ -41,11 +58,17 @@ Prototype:
  */
 int cureq_call(const char *method,
                const char *url,
-               char ***headers,
+               const char *const *const *headers,
                int headers_count,
                unsigned char *ret_buffer,
                int max_ret_buffer,
                int *ret_buffer_read,
                unsigned char *payload,
                int payload_len);
+```
+
+Build:
+```sh
+# requires make, rust, cargo, cbindgen, and a C compiler
+; make
 ```

cureq.c

@@ -4,7 +4,7 @@
 #include "./cureq.h"
 
 int main() {
-    char buffer[5000];
+    unsigned char buffer[5000];
     char *url = "https://httpbin.org/anything";
     char *method = "POST";
     char *payload = "some payload";
@@ -13,13 +13,14 @@ int main() {
     const char *header0[] = {"name0", "value0"};
     const char *header1[] = {"name1", "value1"};
     const char *const *headers[] = {header0, header1};
+    int headers_count = 2;
 
     fprintf(stderr, "Making a %s request to %s\n", method, url);
     fprintf(stderr, "Set headers: %s: %s, %s: %s\n", header0[0], header0[1], header1[0], header1[1]);
     fprintf(stderr, "====================\n");
 
     int read_bytes = 0;
-    int status = cureq_call(method, url, headers, 2, buffer, sizeof(buffer), &read_bytes, payload, payload_len);
+    int status = cureq_call(method, url, headers, headers_count, buffer, sizeof(buffer), &read_bytes, (unsigned char *) payload, payload_len);
     if (status == -1) {
         fprintf(stderr, "Error fetching content!\n");
         return 1;

src/lib.rs

@@ -3,7 +3,7 @@ use std::ffi::{c_int, c_uchar, c_char, CStr};
 use std::io::Read;
 
 #[no_mangle]
-/// Make a GET request to the given URL
+/// Perform a request to the given URL
 ///
 /// @fn ureq_get
 ///