From b2ead8735bd97e187188a3a91105df7fd6366b39 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=8E=E9=80=9A=E6=B4=B2?= <zhangsongcui3371@sina.com>
Date: Thu, 24 Aug 2023 14:20:48 +0800
Subject: [PATCH] Platform (Unix): add `exePath`

---
 src/util/platform/FFPlatform_unix.c | 48 +++++++++++++++++------------
 1 file changed, 28 insertions(+), 20 deletions(-)

diff --git a/src/util/platform/FFPlatform_unix.c b/src/util/platform/FFPlatform_unix.c
index 2fa403ca6..3f7aada12 100644
--- a/src/util/platform/FFPlatform_unix.c
+++ b/src/util/platform/FFPlatform_unix.c
@@ -14,6 +14,27 @@
     #include <sys/sysctl.h>
 #endif
 
+static void getExePath(FFPlatform* platform)
+{
+    FFstrbuf* const exePath = &platform->exePath;
+    ffStrbufEnsureFree(exePath, PATH_MAX);
+    #ifdef __linux__
+        ssize_t exePathLen = readlink("/proc/self/exe", exePath->chars, exePath->allocated);
+    #elif defined(__APPLE__)
+        int exePathLen = proc_pidpath((int) getpid(), exePath->chars, exePath->allocated);
+    #elif defined(__FreeBSD__)
+        size_t exePathLen = exePath->allocated;
+        if(sysctl(
+            (int[]){CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, (int) getpid()}, 4,
+            exePath->chars, &exePathLen,
+            NULL, 0
+        ))
+            exePathLen = 0;
+    #endif
+    if (exePathLen > 0)
+        exePath->length = (uint32_t) exePathLen;
+}
+
 static void platformPathAddEnv(FFlist* dirs, const char* env)
 {
     const char* envValue = getenv(env);
@@ -90,27 +111,13 @@ static void getDataDirs(FFPlatform* platform)
     ffPlatformPathAddHome(&platform->dataDirs, platform, ".local/share/");
 
     // Add ${currentExePath}/../share
-    FF_STRBUF_AUTO_DESTROY exePath = ffStrbufCreateA(PATH_MAX);
-    #ifdef __linux__
-        ssize_t exePathLen = readlink("/proc/self/exe", exePath.chars, exePath.allocated);
-    #elif defined(__APPLE__)
-        int exePathLen = proc_pidpath((int) getpid(), exePath.chars, exePath.allocated);
-    #elif defined(__FreeBSD__)
-        size_t exePathLen = exePath.allocated;
-        if(sysctl(
-            (int[]){CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, (int) getpid()}, 4,
-            exePath.chars, &exePathLen,
-            NULL, 0
-        ))
-            exePathLen = 0;
-    #endif
-    if (exePathLen > 0)
+    if (platform->exePath.length > 0)
     {
-        exePath.length = (uint32_t) exePathLen;
-        ffStrbufSubstrBeforeLastC(&exePath, '/');
-        ffStrbufSubstrBeforeLastC(&exePath, '/');
-        ffStrbufAppendS(&exePath, "/share");
-        ffPlatformPathAddAbsolute(&platform->dataDirs, exePath.chars);
+        FF_STRBUF_AUTO_DESTROY path = ffStrbufCreateCopy(&platform->exePath);
+        ffStrbufSubstrBeforeLastC(&path, '/');
+        ffStrbufSubstrBeforeLastC(&path, '/');
+        ffStrbufAppendS(&path, "/share");
+        ffPlatformPathAddAbsolute(&platform->dataDirs, path.chars);
     }
 
     #ifdef __APPLE__
@@ -183,6 +190,7 @@ void ffPlatformInitImpl(FFPlatform* platform)
     if(uname(&uts) != 0)
         memset(&uts, 0, sizeof(uts));
 
+    getExePath(platform);
     getHomeDir(platform, pwd);
     getCacheDir(platform);
     getConfigDirs(platform);