Version: print libc version used when compiling

src/detection/libc/libc.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#ifndef FF_INCLUDED_detection_libc_libc
+#define FF_INCLUDED_detection_libc_libc
+
+#include "fastfetch.h"
+
+typedef struct FFLibcResult
+{
+    const char* name;
+    const char* version;
+} FFLibcResult;
+
+const char* ffDetectLibc(FFLibcResult* result);
+
+#endif

src/detection/libc/libc_android.c

@@ -0,0 +1,25 @@
+#include "libc.h"
+
+#define FF_STR_INDIR(x) #x
+#define FF_STR(x) FF_STR_INDIR(x)
+
+#include <features.h>
+
+const char* ffDetectLibc(FFLibcResult* result)
+{
+#if __ANDROID_NDK__
+    result->name = "ndk-bionic";
+    result->version = FF_STR(__NDK_MAJOR__) "." FF_STR(__NDK_MINOR__) "." FF_STR(__NDK_BUILD__)
+
+    #if __NDK_BETA__
+    "-beta" FF_STR(__NDK_BETA__)
+    #elif __NDK_CANARY__
+    "-canary"
+    #endif
+
+    ;
+    return NULL;
+#else
+    return "Unknown Android libc";
+#endif
+}

src/detection/libc/libc_linux.c

@@ -0,0 +1,19 @@
+#include "libc.h"
+
+#define FF_STR_INDIR(x) #x
+#define FF_STR(x) FF_STR_INDIR(x)
+
+#include <features.h>
+
+const char* ffDetectLibc(FFLibcResult* result)
+{
+#ifdef __GNU_LIBRARY__
+    result->name = "glibc";
+    result->version = FF_STR(__GLIBC__) "." FF_STR(__GLIBC_MINOR__);
+#else
+    result->name = "musl";
+    result->version = NULL;
+#endif
+
+    return NULL;
+}

src/detection/libc/libc_nosupport.c

@@ -0,0 +1,9 @@
+#include "libc.h"
+
+#define FF_STR_INDIR(x) #x
+#define FF_STR(x) FF_STR_INDIR(x)
+
+const char* ffDetectLibc(FF_MAYBE_UNUSED FFLibcResult* result)
+{
+    return "Not supported on this platform";
+}

src/detection/libc/libc_windows.cpp

@@ -0,0 +1,65 @@
+extern "C"
+{
+#include "libc.h"
+}
+
+#ifdef __MINGW32__
+#include <_mingw.h>
+#endif
+
+template<uint32_t Major, uint32_t Minor>
+class version_t {
+    constexpr static auto buflen() noexcept {
+        unsigned int len = 2; // "."
+        if (Major == 0)
+            len++;
+        else
+            for (auto n = Major; n; len++, n /= 10);
+
+        if (Minor == 0)
+            len++;
+        else
+            for (auto n = Minor; n; len++, n /= 10);
+        return len;
+    }
+
+    char buf[buflen()] = {};
+
+public:
+    constexpr version_t() noexcept {
+        auto ptr = buf + buflen();
+        *--ptr = '\0';
+
+        if (Minor == 0) {
+            *--ptr = '0';
+        } else {
+            for (auto n = Minor; n; n /= 10)
+                *--ptr = "0123456789"[n % 10];
+        }
+        *--ptr = '.';
+        if (Major == 0) {
+            *--ptr = '0';
+        } else {
+            for (auto n = Major; n; n /= 10)
+                *--ptr = "0123456789"[n % 10];
+        }
+    }
+
+    constexpr operator const char *() const { return buf; }
+};
+
+template<uint32_t Major, uint32_t Minor>
+constexpr version_t<Major, Minor> version;
+
+extern "C"
+const char* ffDetectLibc(FFLibcResult* result)
+{
+#ifdef _UCRT
+    result->name = "ucrt";
+#else
+    result->name = "msvcrt";
+#endif
+
+    result->version = version<(__MSVCRT_VERSION__ >> 8), (__MSVCRT_VERSION__ & 8)>;
+    return NULL;
+}