Split out initializing the printer

init_printer.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+set -e
+dev=/dev/usb/lp0
+
+# Initialize printer
+printf '\x1B@' > $dev
+
+# Set print speed
+printf '\x1D(K\2\0' > $dev
+printf '21' > $dev
+
+# Set head energizing
+printf '\x1D(K\2\0' > $dev
+printf 'a4' > $dev  # 0-4, or \x80 for automatic, default=0

print_barcode.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
 
+./init_printer.sh
 printf '\x1Dk\x05'$1'\0' > /dev/usb/lp0
 ./cut_paper.sh

print_image.sh

@@ -15,16 +15,7 @@ size="$(hex_size "$(("$size" + 10))")"
 size_x="$(hex_size "$(echo "$data_header" | cut -d' ' -f 1)")"
 size_y="$(hex_size "$(echo "$data_header" | cut -d' ' -f 2)")"
 
-# Initialize printer
-printf '\x1B@' > $dev
-
-# Set print speed
-printf '\x1D(K\2\0' > $dev
-printf '21' > $dev
-
-# Set head energizing
-printf '\x1D(K\2\0' > $dev
-printf 'a4' > $dev  # 0-4, or \x80 for automatic, default=0
+./init_printer.sh
 
 # Upload graphics data
 printf '\x1D(L' > $dev
@@ -40,5 +31,4 @@ echo "$data" | base64 -d > $dev
 printf '\x1D(L\2\0' > $dev
 printf '02' > $dev
 
-# Cut paper
 ./cut_paper.sh

print_qrcode.sh

@@ -7,6 +7,8 @@ size="$(printf '%s' "$text" | wc -c)"
 size="$(expr "$size" + 3)"
 size="$(printf '%04x' "$size" | sed -e 's/\(..\)\(..\)/\\x\2\\x\1/g')"
 
+./init_printer.sh
+
 # Store data
 printf '\x1D(k' > $dev
 printf "$size" > $dev
@@ -17,5 +19,4 @@ printf '%s' "$text" > $dev
 printf '\x1D(k' > $dev
 printf '\x03\0\x31\x51\x30' > $dev
 
-# Cut paper
-printf '\x1DVA\0' > $dev
+./cut_paper.sh