From 273671ff063c62af3a133f3dda67f33867f225e2 Mon Sep 17 00:00:00 2001
From: Mustafa Quraish <mustafaq9@gmail.com>
Date: Sun, 6 Feb 2022 23:45:09 -0500
Subject: [cup] Add support for `here` keyword + fix `putu_buffer` bug

---
 compiler/lexer.cup | 16 ++++++++++++++++
 std/common.cup     |  6 +++---
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/compiler/lexer.cup b/compiler/lexer.cup
index 1bcbb35..50b06e2 100644
--- a/compiler/lexer.cup
+++ b/compiler/lexer.cup
@@ -184,6 +184,22 @@ fn lexer_next(lexer: Lexer*, token: Token*) {
         }
 
         else {
+            // Handle the `here` keyword at lex-time
+            if (lexer_starts_with(lexer, "here")) {
+                let s: char* = malloc(sizeof(char) * 128); // Should be enough 
+                // Print the location into the string
+                let buf: char[32];
+                strcpy(s, lexer.filename); strcat(s, ":");
+                putu_buffer(lexer.line+1, buf); strcat(s, buf); strcat(s, ":");
+                putu_buffer(lexer.col+1, buf); strcat(s, buf);
+
+                // Make the token
+                let loc: Location;
+                lexer_loc(lexer, &loc);
+                lexer_advance(lexer, 4);
+                return token_from_string(token, s, &loc);
+            }
+
             // Parse the keywords...
             for (let i = TOKEN__KEYWORD_BEGIN+1; i < TOKEN__KEYWORD_END; ++i) {
                 let str = keyword_to_string(i);
diff --git a/std/common.cup b/std/common.cup
index 3d0b269..dac8148 100644
--- a/std/common.cup
+++ b/std/common.cup
@@ -157,10 +157,10 @@ fn putu_buffer(n: int, buf: char*): int {
     if (i == 0) {
         buf[i] = '0';
         i = i + 1;
-    } else if (i > 1) {
-        buf[i] = 0;
-        strrev(buf);
     }
+    buf[i] = 0;
+    if (i > 1)
+        strrev(buf);
     return i;
 }
 
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