src/cat.S

@@ -62,6 +62,26 @@ cat_file:
     mv s2, a1 # update the current byte count
     .LNoEndings:
 
+    la t1, number
+    lb t1, 0(t1)
+    beqz t1, .LNoNumbers
+
+    mv a1, s2 # load mod buf size to a1
+
+    beqz s1, 1f
+    la a0, mod_buf_0 # load mod_buf_0 as read buf
+    la a2, mod_buf_1 # load mod_buf_1 as write buf
+    j 2f
+    1:
+    la a0, mod_buf_1 # load mod_buf_1 as read buf
+    la a2, mod_buf_0 # load mod_buf_0 as write buf
+    2:
+
+    call add_line_numbers
+    xori s1, s1, 1 # flip the mod buf to write to
+    mv s2, a1 # update the current byte count
+    .LNoNumbers:
+
     beqz s1, 1f 
     la a1, mod_buf_0
     j 2f

src/mod.S

@@ -77,40 +77,60 @@ add_endings:
 # @param[out] a1: bytes written to mod buf.
 add_line_numbers:
     addi sp, sp, -72
-    sd s7, 64(sp)
-    sd s6, 56(sp)
-    sd s5, 48(sp)
-    sd s4, 40(sp)
+    sd s7, 64(sp) #unused
+    sd s6, 56(sp) # mod buf ptr
+    sd s5, 48(sp) # mod buf bp
+    sd s4, 40(sp) # str buf ptr
     sd ra, 32(sp)
-    sd s3, 24(sp)
-    sd s2, 16(sp)
-    sd s1, 8(sp)
-    sd s0, 0(sp)
+    sd s3, 24(sp) # mod buf offset
+    sd s2, 16(sp) # str buf offset
+    sd s1, 8(sp) # len of str
+    sd s0, 0(sp) # str buf addr
 
 
     mv s0, a0 # put the str ptr in s0
-    mv s1, a1
-    li s2, 0 # set the str buf char counter to 0
-    li s3, 0 # set the mod buf char counter to 0
+    mv s1, a1 # move length of str into s1
+    li s2, 0 # set the str buf char offset to 0
+    li s3, 0 # set the mod buf char offset to 0
+    mv s5, a2 # move mod buf addr into s5
     
-    mv s5, a2
     .LLineNumbersProcessChunk:
     add s4, s0, s2 # Calculate the offset address
     lb t6, 0(s4)
     li t4, 0xA # newline
     bne t6, t4, 1f # if the current byte is not a newline, skip to writing
     
-    add s4, s5, s3 # move modbuf pointer
-    li t5, '\n'
-    sb t5, 0(s4) # mod buf[s2] = \n
+    call _inc_line_count
     
-    addi s4, s4, 1
+    addi s3, s3, 1 # we want the ptr at the spot right after the newline
+    add s6, s5, s3 # update mod buf + offset addr
+    
+    li t2, 0 # lc char buf offset
+    li t3, 6 # lc char buf max offset
+    la t1, line_count # load the line count buffer addr
+    li t5, 0xA # newline character
+    sb t5, 0(s6)
     addi s3, s3, 1
+    add s6, s5, s3 # update mod buf + offset addr
+    3:
+    add t4, t1, t2
+    lb t5, 0(t4)
+    sb t5, 0(s6) # mod buf[s4] = t4
+    addi t2, t2, 1
+    addi s3, s3, 1
+    add s6, s5, s3 # update mod buf + offset addr
+    blt t2, t3, 3b
+
+    li t5, 0x7 # tab character
+    sb t5, 0(s6)
+
+    addi s3, s3, 1
+    
     j 2f
 
     1:
-    add s4, s5, s3 # s4 = mod buf[s2]
-    sb t6, 0(s4) # mod buf[s2] = t6
+    add s6, s5, s3 # s4 = mod buf[s2]
+    sb t6, 0(s6) # mod buf[s2] = t6
 
     addi s3, s3, 1 # inc mod buf pointer
     2:
@@ -175,7 +195,7 @@ _inc_line_count:
 zero_line_count:
     la t0, line_count # load the line count buffer address
     li t1, 0 # char ptr
-    li t2, 5 # max char
+    li t2, 6 # max char
     li t3, 32 # space character
 
     1: