Add 'onerng' and 'xor'

README.md

@@ -207,6 +207,10 @@ This allows for fast startup, by executing a tmux configuration file as a progra
 ---
 Play randomly-generated noise through the speakers
 
+onerng
+---
+Outputs the (raw) random bytes from an OneRNG hardware device
+
 owns?
 ---
 Checks which Arch Linux package owns a command
@@ -363,3 +367,11 @@ Counts the number of words in a file or stream.
 xadom
 ---
 Runs adom in a fixed-geometry window (because window geometry affects gameplay)
+
+xor
+---
+Takes the bitwise xor of the given files (or infinite streams), extending all files to the longest length with zeros.
+
+Usage:
+
+    xor FILE1 FILE2 [FILE3...]

budget_summary.py

@@ -1,9 +1,12 @@
 #!/usr/bin/python3
-import datetime
-import re
+import datetime, re, sys
 
-current_date=str(datetime.date.today())
-with open("blog2.za3k.com/_posts/{}-weekly-review.md".format(current_date), "r") as f:
+if len(sys.argv) > 1:
+    fp = sys.argv[1]
+else:
+    current_date=str(datetime.date.today())
+    fp = "/home/zachary/blog2.za3k.com/_posts/{}-weekly-review.md".format(current_date)
+with open(fp, "r") as f:
     lines = list(line for line in f)
 
 budget_start = re.compile("^\\| Date")
@@ -19,9 +22,14 @@
 for line in budget[2:]:
     date, place, amount, category, thing = [x.strip() for x in line.split("|")[1:]]
     lines.append((float(amount), category))
-print("{: <12} {}".format("Total:", sum(amount for (amount, category) in lines)))
-print("{: <12} {}".format("Total (no rent):", sum(amount for (amount, category) in lines if category != "Rent")))
+print("{: <12} {:.2f}".format("Total:", sum(amount for (amount, category) in lines)))
+print("{: <12} {:.2f}".format("Total (no rent):", sum(amount for (amount, category) in lines if category != "Rent")))
 categories = sorted(set(category for (amount, category) in lines))
 print()
+OTHER = ("Food", "Grocery", "Luxury")
 for category in categories:
-    print("{: <12} {}".format(category+":", sum(amount for (amount, c) in lines if category == c)))
+    if category not in OTHER:
+        print("{: <12} {:.2f}".format(category+":", sum(amount for (amount, c) in lines if category == c)))
+print("{: <12} {:.2f}".format("Other"+":", sum(amount for (amount, c) in lines if c in OTHER)))
+for category in OTHER:
+    print("  {: <12} {:.2f}".format(category+":", sum(amount for (amount, c) in lines if category == c)))

onerng

@@ -0,0 +1,16 @@
+#!/bin/bash
+ONERNG=/dev/ttyACM0
+t=onerng.out
+
+stty -F $ONERNG raw -echo clocal -crtscts
+echo "cmd0" >$ONERNG            # standard noise
+echo "cmdO" >$ONERNG            # turn it on
+stty -F $ONERNG raw -echo clocal -crtscts
+gone() {
+  echo "cmdo" >$ONERNG            # turn it off
+  echo "cmd4" >$ONERNG            # turn off noise gathering
+  echo "cmdw" >$ONERNG            # flush entropy pool
+}
+trap gone EXIT SIGINT SIGTERM SIGHUP
+dd if=$ONERNG iflag=fullblock bs=1k "$@"
+exit 0

random_book

@@ -0,0 +1,20 @@
+#!/bin/sh
+TMPFILE=`mktemp`
+BOOK=$(ssh germinate "/home/zachary/bin/random_book" epub pdf txt html mobi)
+scp -q germinate:$BOOK "$TMPFILE"
+echo "$BOOK"
+case $BOOK in
+  *.pdf)
+  evince "$TMPFILE" >/dev/null 2>/dev/null
+  ;;
+  *.html)
+  w3m -T text/html "$TMPFILE"
+  ;;
+  *.txt)
+  less "$TMPFILE"
+  ;;
+  *.epub|*.mobi)
+  cr3 "$TMPFILE" >/dev/null 2>/dev/null
+  ;;
+esac
+rm "$TMPFILE"

xor.c

@@ -0,0 +1,55 @@
+// 'xor'
+// by zachary vance, released into the public domain (see CC0 1.0 license)
+// Given two streams (exactly) as filenames on the command line, print to stdout the 'xor' of the two files. Pads the shorter file with zeros, so the length of the output is always the length of the longer file
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+
+#define MAX_FILES 10
+#define BUFFER 1024
+
+int main(int argc, char *argv[]){
+  FILE *fp[MAX_FILES];
+  char inbytes[BUFFER], outbytes[BUFFER];
+  int bytes_read, max_bytes_read;
+  int files, files_done;
+  int f,b;
+
+  files = argc-1;
+  if (files < 2) {
+    printf("usage: xor FILE1 FILE2\n");
+    return 2;
+  } else if (files > MAX_FILES) {
+    printf("Too many files. Please recompile with a faster number of files maximum\n");
+    return 2;
+  }
+
+  for (f=0;f<files;f++){
+    fp[f]=fopen(argv[f+1],"rb");
+    if(fp[f] == NULL){
+      printf("File %d not found: %s\n", f, argv[f+1]);
+      return 1;
+    }
+  }
+
+  while(1) {
+    files_done=0;
+    for(f=0;f<files;f++)
+      if(feof(fp[f])) files_done++;
+    if(files == files_done) break;
+
+    memset(outbytes, 0, BUFFER);
+    max_bytes_read=0;
+    for(f=0;f<files;f++) {
+      bytes_read = fread(&inbytes, 1, BUFFER, fp[f]);
+      for(b=0;b<bytes_read;b++) outbytes[b] ^= inbytes[b];
+      if(bytes_read > max_bytes_read) max_bytes_read=bytes_read;
+    }
+
+    write(1, outbytes, max_bytes_read);
+  }
+
+  for(f=0;f<files;f++) fclose(fp[f]);
+
+  return 0;
+}