Add linux support

core/path/path_linux.odin

@@ -0,0 +1,80 @@
+package path
+
+foreign import libc "system:c"
+
+import "core:os"
+import "core:strings"
+
+
+MAX :: 4096; // @note(bp): apparently PATH_MAX is bullshit
+
+SEPARATOR        :: '/';
+SEPARATOR_STRING :: "/";
+
+
+@(private)
+null_term :: proc(str: string) -> string {
+    for c, i in str {
+        if c == '\x00' {
+            return str[:i];
+        }
+    }
+    return str;
+}
+
+
+full :: proc(path: string, allocator := context.allocator) -> string {
+    cpath := strings.clone_to_cstring(path, context.temp_allocator);
+    
+    foreign libc {
+        realpath :: proc(path: cstring, resolved_path: ^u8) -> cstring ---;
+    }
+
+    buf := make([dynamic]u8, MAX, MAX, allocator);
+
+    cstr := realpath(cpath, &buf[0]);
+    for cstr == nil && os.get_last_error() == int(os.ENAMETOOLONG) {
+        resize(&buf, len(buf) + MAX);
+        cstr = realpath(cpath, &buf[0]);
+    }
+
+    return null_term(string(buf[:]));
+}
+
+current :: proc(allocator := context.allocator) -> string {
+    foreign libc{
+        getcwd :: proc(buf: ^u8, size: int) -> cstring ---;
+    }
+
+    buf := make([dynamic]u8, MAX, MAX, allocator);
+
+    cstr := getcwd(&buf[0], len(buf));
+    for cstr == nil && os.get_last_error() == int(os.ENAMETOOLONG) {
+        resize(&buf, len(buf) + MAX);
+        cstr = getcwd(&buf[0], len(buf));
+    }
+
+    return null_term(string(buf[:]));
+}
+
+
+exists :: proc(path: string) -> bool {
+    if _, err := os.stat(path); err != os.ERROR_NONE {
+        return true;
+    }
+    return false;
+}
+
+is_dir :: proc(path: string) -> bool {
+    if stat, err := os.stat(path); err == os.ERROR_NONE {
+        return os.S_ISDIR(stat.mode);
+    }
+    return false;
+}
+
+is_file :: proc(path: string) -> bool {
+    if stat, err := os.stat(path); err == os.ERROR_NONE {
+        return os.S_ISREG(stat.mode);
+    }
+    return false;
+}