Gemmi: Add more functionality from gemmi 0.7.5

gemmi_gph/sprintf.cpp

@@ -0,0 +1,68 @@
+// Copyright 2017 Global Phasing Ltd.
+
+#include <gemmi/sprintf.hpp>
+#include <stdarg.h>  // for va_list
+
+#ifdef USE_STD_SNPRINTF  // useful for benchmarking and testing only
+# include <cstdio>
+# include <algorithm> // for min
+#else
+# define STB_SPRINTF_IMPLEMENTATION
+# define STB_SPRINTF_STATIC
+# define STB_SPRINTF_NOUNALIGNED 1
+// Making functions from stb_sprintf static may trigger warnings.
+# if defined(__GNUC__)
+#  pragma GCC diagnostic ignored "-Wunused-function"
+# endif
+# if defined(__clang__)
+#  pragma clang diagnostic ignored "-Wunused-function"
+# endif
+
+// To use system stb_sprintf.h (not recommended, but some Linux distros
+// don't like bundled libraries) define GEMMI_USE_SYSTEM_STB or remove
+// third_party/stb_sprintf.h.
+# if defined(__has_include)
+#  if !__has_include("../third_party/stb_sprintf.h")
+#   define GEMMI_USE_SYSTEM_STB 1
+#  endif
+# endif
+# ifdef GEMMI_USE_SYSTEM_STB
+#  pragma message("Using system stb_sprintf.h, not the bundled one. It may not work.")
+#  include "stb/stb_sprintf.h"
+# else
+#  include "../third_party/stb_sprintf.h"
+# endif
+#endif  // USE_STD_SNPRINTF
+
+namespace gemmi {
+
+// We copy functions from sprintf.h only to have them declared with GEMMI_DLL.
+int sprintf_z(char *buf, char const *fmt, ...) {
+  int result;
+  va_list va;
+  va_start(va, fmt);
+#ifdef USE_STD_SNPRINTF
+  result = std::vsprintf(buf, fmt, va);
+#else
+  result = STB_SPRINTF_DECORATE(vsprintfcb)(0, 0, buf, fmt, va);
+#endif
+  va_end(va);
+  return result;
+}
+
+int snprintf_z(char *buf, int count, char const *fmt, ...) {
+  int result;
+  va_list va;
+  va_start(va, fmt);
+#ifdef USE_STD_SNPRINTF
+  result = std::vsnprintf(buf, count, fmt, va);
+  // stbsp_snprintf always returns a zero-terminated string
+  buf[std::min(result, count-1)] = '\0';
+#else
+  result = STB_SPRINTF_DECORATE(vsnprintf)(buf, count, fmt, va);
+#endif
+  va_end(va);
+  return result;
+}
+
+}  // namespace gemmi