Added filesystem stuff on Linux

More includes for Linux
Update build script to copy assets and compile shaders
Added base code directory as include path
Added FS_SystemPath
Made asset loading work directory agnostic

code/os/impl/linux/core.c

@@ -28,4 +28,4 @@ void VM_Release(void *base, U64 size) {
 	munmap(base, size);
 }
 
-
+#include "filesystem.c"

code/os/impl/linux/filesystem.c

@@ -0,0 +1,215 @@
+OS_Handle FS_FileOpen(Str8 path, FS_AccessFlags access) {
+	OS_Handle result = { 0 };
+
+	M_TempScope(0, 0) {
+		Str8 zpath = Str8_Copy(temp.arena, path);
+
+		int mode  = 0644;
+		int flags = 0;
+		if (access & FS_ACCESS_READ) {
+			if (access & FS_ACCESS_WRITE) {
+				flags = O_RDWR | O_CREAT;
+			}
+			else {
+				flags = O_RDONLY;
+			}
+		}
+		else if (access & FS_ACCESS_WRITE) {
+			flags = O_WRONLY | O_CREAT;
+		}
+
+
+		int fd = open((const char *) zpath.data, flags, mode);
+		result.v[0] = (fd > 0) ? (U64) fd : 0;
+	}
+
+	return result;
+}
+void FS_FileClose(OS_Handle file) {
+	int fd = cast(int) file.v[0];
+	if (fd > 0) {
+		close(fd);
+	}
+}
+
+void FS_FileRead(OS_Handle file, void *ptr, U64 size, U64 offset) {
+	int fd = cast(int) file.v[0];
+	if (fd > 0) {
+		U8 *buffer    = ptr;
+		U64 current   = offset;
+		U64 remainder = size;
+
+		while (remainder != 0) {
+			S64 nread = pread(fd, buffer, remainder, current);
+			if (nread <= 0) {
+				break;
+			}
+
+			buffer    += nread;
+			current   += nread;
+			remainder -= nread;
+		}
+	}
+}
+
+void FS_FileWrite(OS_Handle file, void *ptr, U64 size, U64 offset) {
+	int fd = cast(int) file.v[0];
+	if (fd > 0) {
+		U8 *buffer    = ptr;
+		U64 current   = offset;
+		U64 remainder = size;
+
+		while (remainder != 0) {
+			S64 nwritten = pwrite(fd, buffer, remainder, current);
+			if (nwritten <= 0) {
+				break;
+			}
+
+			buffer    += nwritten;
+			current   += nwritten;
+			remainder -= nwritten;
+		}
+	}
+}
+
+U64 FS_FileSize(OS_Handle file) {
+	U64 result = 0;
+
+	int fd = cast(int) file.v[0];
+	if (fd > 0) {
+		struct stat sb;
+		fstat(fd, &sb);
+
+		result = sb.st_size;
+	}
+
+	return result;
+}
+
+FS_List FS_PathList(M_Arena *arena, Str8 path) {
+	FS_List result = { 0 };
+
+	M_TempScope(1, &arena) {
+		Str8 zpath = Str8_Copy(temp.arena, path);
+
+		DIR *dir = opendir((const char *) zpath.data);
+
+		struct dirent *ent = readdir(dir);
+		while (ent != 0) {
+			if (ent->d_name[0] != '.') {
+				FS_Entry *entry = M_ArenaPush(arena, FS_Entry);
+
+				entry->basename = Str8_Copy(arena, Sz(ent->d_name));
+				entry->path     = Sf(arena, "%.*s/%.*s", Sv(path), Sv(entry->basename));
+
+				struct stat sb;
+				stat((const char *) entry->path.data, &sb);
+
+				entry->type = ((sb.st_mode & S_IFMT) == S_IFDIR) ? FS_ENTRY_TYPE_DIR : FS_ENTRY_TYPE_FILE;
+				entry->time = (sb.st_mtim.tv_sec * 1e9) + sb.st_mtim.tv_nsec;
+				entry->size = sb.st_size;
+
+				SLL_Enqueue(result.first, result.last, entry);
+				result.count += 1;
+			}
+
+			ent = readdir(dir);
+		}
+	}
+
+	return result;
+}
+
+Str8 FS_SystemPath(M_Arena *arena, FS_SystemPathType path) {
+	Str8 result = { 0 };
+
+	switch (path) {
+		case FS_SYSTEM_PATH_EXE: {
+			U64 offset = M_ArenaOffset(arena);
+
+			Str8 buffer;
+			buffer.count = KB(1);
+			buffer.data  = M_ArenaPush(arena, U8, .count = buffer.count);
+
+			ssize_t nwritten = 0;
+			for (;;) {
+				nwritten = readlink("/proc/self/exe", cast(char *) buffer.data, buffer.count);
+				if (nwritten < buffer.count) {
+					break;
+				}
+
+				M_ArenaPop(arena, offset);
+
+				buffer.count *= 2;
+				buffer.data   = M_ArenaPush(arena, U8, .count = buffer.count);
+			}
+
+			if (nwritten > 0) {
+				// Walk back until the prevous slash, then null-terminate there
+				while (buffer.data[nwritten] != '/') { nwritten -= 1; }
+				buffer.data[nwritten] = 0;
+
+				M_ArenaPopSize(arena, buffer.count - nwritten - 1);
+
+				result.count = nwritten;
+				result.data  = buffer.data;
+			}
+			else {
+				M_ArenaPop(arena, offset);
+			}
+		}
+		break;
+
+		case FS_SYSTEM_PATH_WORKING: {
+			U64 offset = M_ArenaOffset(arena);
+
+			Str8 buffer;
+			buffer.count = KB(1);
+			buffer.data  = M_ArenaPush(arena, U8, .count = buffer.count);
+
+			char *wd;
+
+			for (;;) {
+				wd = getcwd((char *) buffer.data, buffer.count);
+				if (wd != 0) {
+					break;
+				}
+				else if (errno != ERANGE) {
+					break;
+				}
+
+				M_ArenaPop(arena, offset);
+
+				buffer.count *= 2;
+				buffer.data   = M_ArenaPush(arena, U8, .count = buffer.count);
+			}
+
+			if (wd) {
+				result = Sz(wd);
+				M_ArenaPopSize(arena, buffer.count - result.count - 1);
+			}
+		}
+		break;
+
+		case FS_SYSTEM_PATH_USER: {
+			char *home = getenv("HOME");
+			if (home) {
+				result = Sf(arena, "%s/.local/share", home);
+			}
+		}
+		break;
+
+		case FS_SYSTEM_PATH_TEMP: {
+			char *temp = getenv("TEMP");
+			if (temp) {
+				result = Str8_Copy(arena, Sz(temp));
+			}
+			else {
+				result = Str8_Copy(arena, S("/tmp"));
+			}
+		}
+		break;
+	}
+
+	return result;
+}