Modify file error to match real cat

src/file.S

@@ -68,19 +68,19 @@ open_fd:
     2:
     ret
 
-# Check if the given file exists without opening fd
-# @param[in] a0: ptr to null-terminated file str.
-# @param[out] a0: result code (0-exists 1-doesn't exist).
-file_exists:
-    mv a1, a0
-    li a0, -100 # relative/absolute path
-    li a2, 0
-    li a7, 48
-    ecall
-    beqz a0, 1f
-    li a0, 1
-    ret
+# # Check if the given file exists without opening fd
+# # @param[in] a0: ptr to null-terminated file str.
+# # @param[out] a0: result code (0-exists 1-doesn't exist).
+# file_exists:
+#     mv a1, a0
+#     li a0, -100 # relative/absolute path
+#     li a2, 0
+#     li a7, 48
+#     ecall
+#     beqz a0, 1f
+#     li a0, 1
+#     ret
 
-    1:
-    li a0, 0
-    ret
+#     1:
+#     li a0, 0
+#     ret

src/main.S

@@ -1,9 +1,11 @@
 .data
 argc:           .space 8
-file_err:       .asciz "File not found or cannot be accessed: "
-
+cat_prefix:     .asciz "cat: "
+.equ CAT_PREFIX_LEN, . - cat_prefix
+file_err:       .asciz ": No such file or directory\n"
 .equ FILE_ERR_LEN, . - file_err
 
+
 .section .text
 .globl _start
 
@@ -20,17 +22,17 @@ _start:
     mv s0, a1 # store argc
     li s1, 1
 
-    5: #iterate through and check that all files exist first
-    mv a0, s1
-    call fetch_argv
-    bnez a0, 1f # error if failed
-    mv a0, a1
-    call file_exists
-    bnez a0, 4f
-    addi s1, s1, 1
-    blt s1, s0, 5b
+    # 5: #iterate through and check that all files exist first
+    # mv a0, s1
+    # call fetch_argv
+    # bnez a0, 1f # error if failed
+    # mv a0, a1
+    # call file_exists
+    # bnez a0, 4f
+    # addi s1, s1, 1
+    # blt s1, s0, 5b
 
-    li s1, 1 # reset counter now that we've verified all files exist, skip command
+    # li s1, 1 # reset counter now that we've verified all files exist, skip command
 
     3:
     mv a0, s1
@@ -45,12 +47,11 @@ _start:
 
     4:
     li a0, 1
-    la a1, file_err
-    li a2, FILE_ERR_LEN
+    la a1, cat_prefix
+    li a2, CAT_PREFIX_LEN
     li a7, 64
     ecall
 
-    li t0, 1
     mv a0, s1
     call fetch_argv
     
@@ -58,6 +59,13 @@ _start:
     li a7, 64
     ecall
 
+    li a0, 1
+    la a1, file_err
+    li a2, FILE_ERR_LEN
+    li a7, 64
+    ecall
+    
+
     1:
     li a0, 1
     li a7, 93