Moved HTTP client, ssl and some util code into separate files

build/src/mg_printf.c

@@ -0,0 +1,67 @@
+#include "internal.h"
+
+// Print message to buffer. If buffer is large enough to hold the message,
+// return buffer. If buffer is to small, allocate large enough buffer on heap,
+// and return allocated buffer.
+static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) {
+  va_list ap_copy;
+  int len;
+
+  // Windows is not standard-compliant, and vsnprintf() returns -1 if
+  // buffer is too small. Also, older versions of msvcrt.dll do not have
+  // _vscprintf().  However, if size is 0, vsnprintf() behaves correctly.
+  // Therefore, we make two passes: on first pass, get required message length.
+  // On second pass, actually print the message.
+  va_copy(ap_copy, ap);
+  len = vsnprintf(NULL, 0, fmt, ap_copy);
+
+  if (len > (int) size &&
+      (size = len + 1) > 0 &&
+      (*buf = (char *) malloc(size)) == NULL) {
+    len = -1;  // Allocation failed, mark failure
+  } else {
+    va_copy(ap_copy, ap);
+    vsnprintf(*buf, size, fmt, ap_copy);
+  }
+
+  return len;
+}
+
+int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap) {
+  char mem[MG_BUF_LEN], *buf = mem;
+  int len;
+
+  if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
+    len = mg_write(conn, buf, (size_t) len);
+  }
+  if (buf != mem && buf != NULL) {
+    free(buf);
+  }
+
+  return len;
+}
+
+int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
+  va_list ap;
+  va_start(ap, fmt);
+  return mg_vprintf(conn, fmt, ap);
+}
+
+static int mg_chunked_printf(struct mg_connection *conn, const char *fmt, ...) {
+  char mem[MG_BUF_LEN], *buf = mem;
+  int len;
+
+  va_list ap;
+  va_start(ap, fmt);
+  if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
+    len = mg_printf(conn, "%X\r\n%s\r\n", len, buf);
+  }
+
+  if (buf != mem && buf != NULL) {
+    free(buf);
+  }
+
+  return len;
+}
+
+