Fix casepath chaos

src/skel/crossplatform.cpp

@@ -87,7 +87,7 @@ void FileTimeToSystemTime(time_t* writeTime, SYSTEMTIME* out) {
 // Funcs/features from Windows that we need on other platforms
 #ifndef _WIN32
 char *strupr(char *s) {
-   char* tmp = s;
+    char* tmp = s;
 
     for (;*tmp;++tmp) {
         *tmp = toupper((unsigned char) *tmp);
@@ -96,7 +96,7 @@ char *strupr(char *s) {
     return s;
 }
 char *strlwr(char *s) {
-   char* tmp = s;
+    char* tmp = s;
 
     for (;*tmp;++tmp) {
         *tmp = tolower((unsigned char) *tmp);
@@ -116,86 +116,117 @@ char *trim(char *s) {
     return s;
 }
 
-// Case-insensitivity on linux (from https://github.com/OneSadCookie/fcaseopen)
-// r must have strlen(path) + 2 bytes
-int casepath(char const *path, char *r)
+FILE* _fcaseopen(char const* filename, char const* mode)
 {
+    FILE* result;
+    char* real = casepath(filename);
+    if (!real)
+        result = fopen(filename, mode);
+    else {
+        result = fopen(real, mode);
+        free(real);
+    }
+    return result;
+}
+
+// Case-insensitivity on linux (from https://github.com/OneSadCookie/fcaseopen)
+// Returned string should freed manually (if exists)
+char* casepath(char const* path, bool checkPathFirst)
+{
+    if (checkPathFirst && access(path, F_OK) != -1) {
+        // File path is correct
+        return nil;
+    }
+
     size_t l = strlen(path);
-    char *p = (char*)alloca(l + 1);
+    char* p = (char*)alloca(l + 1);
+    char* out = (char*)malloc(l + 3); // for extra ./
     strcpy(p, path);
 
-    // my addon: change \'s with /
-	char *nextBs;
-	while(nextBs = strstr(p, "\\")){
-		*nextBs = '/';
-	}
-	
-	// my addon: linux doesn't handle filenames with spaces at the end nicely
-	p = trim(p);
+    // my addon: linux doesn't handle filenames with spaces at the end nicely
+    p = trim(p);
 
     size_t rl = 0;
-    
-    DIR *d;
-    if (p[0] == '/')
+
+    DIR* d;
+    if (p[0] == '/' || p[0] == '\\')
     {
         d = opendir("/");
-        p = p + 1;
     }
     else
     {
         d = opendir(".");
-        r[0] = '.';
-        r[1] = 0;
+        out[0] = '.';
+        out[1] = 0;
         rl = 1;
     }
-    
-    int last = 0;
-    char *c = strsep(&p, "/");
-    while (c)
+
+    bool cantProceed = false; // just convert slashes in what's left in string, not case sensitivity
+    bool mayBeTrailingSlash = false;
+    char* c;
+    while (c = strsep(&p, "/\\"))
     {
-        if (!d)
+        // May be trailing slash(allow), slash at the start(avoid), or multiple slashes(avoid)
+        if (*c == '\0')
         {
-            return 0;
+            mayBeTrailingSlash = true;
+            continue;
+        } else {
+            mayBeTrailingSlash = false;
         }
-        
-        if (last)
-        {
-            closedir(d);
-            return 0;
-        }
-        
-        r[rl] = '/';
+
+        out[rl] = '/';
         rl += 1;
-        r[rl] = 0;
-        
-        struct dirent *e = readdir(d);
-        while (e)
+        out[rl] = 0;
+
+        if (cantProceed)
+        {
+            strcpy(out + rl, c);
+            rl += strlen(c);
+            continue;
+        }
+
+        struct dirent* e;
+        while (e = readdir(d))
         {
             if (strcasecmp(c, e->d_name) == 0)
             {
-                strcpy(r + rl, e->d_name);
-                rl += strlen(e->d_name);
+                strcpy(out + rl, e->d_name);
+                int reportedLen = (int)strlen(e->d_name);
+                rl += reportedLen;
+                assert(reportedLen == strlen(c) && "casepath: This is not good at all");
 
                 closedir(d);
-                d = opendir(r);
-                
+                d = opendir(out);
+
+                // Either it wasn't a folder, or permission error, I/O error etc.
+                if (!d) {
+                    cantProceed = true;
+                }
+
                 break;
             }
-
-            e = readdir(d);
         }
-        
+
         if (!e)
         {
-            strcpy(r + rl, c);
+            printf("casepath couldn't find dir/file \"%s\", full path was %s\n", c, path);
+            // No match, add original name and continue converting further slashes.
+            strcpy(out + rl, c);
             rl += strlen(c);
-            last = 1;
+            cantProceed = true;
         }
-        
-        c = strsep(&p, "/");
     }
-    
+
     if (d) closedir(d);
-    return 1;
+    if (mayBeTrailingSlash) {
+        out[rl] = '/';  rl += 1;
+        out[rl] = '\0';
+    }
+
+    if (rl > l + 2) {
+        printf("\n\ncasepath: Corrected path length is longer then original+2:\n\tOriginal: %s (%d chars)\n\tCorrected: %s (%d chars)\n\n", path, l, out, rl);
+    }
+    return out;
 }
 #endif

src/skel/crossplatform.h

@@ -23,7 +23,7 @@ enum eWinVersion
 #include "win.h"
 #endif
 extern DWORD _dwOperatingSystemVersion;
-
+#define fcaseopen fopen
 #else
 char *strupr(char *str);
 char *strlwr(char *str);
@@ -43,7 +43,9 @@ enum {
 };
 
 extern long _dwOperatingSystemVersion;
-int casepath(char const *path, char *r);
+char *casepath(char const *path, bool checkPathFirst = true);
+FILE *_fcaseopen(char const *filename, char const *mode);
+#define fcaseopen _fcaseopen
 #endif
 
 #ifdef RW_GL3