creation

diff --git a/Makefile b/Makefile
new file mode 100644 (file)
index 0000000..92c605f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+SHELL = /bin/bash
+PROG = printbin
+
+debug:
+       gcc *.c *.h -Wall -lm -g -o printbin
+
+printbin:
+       gcc *.c *.h -Wall -lm -o printbin
+
+install:
+       gcc *.c *.h -Wall -lm -o /home/huck/.local/bin/printbin
+
+clean: 
+       rm /home/huck/.local/bin/printbin

diff --git a/README.md b/README.md
new file mode 100644 (file)
index 0000000..70d6485
--- /dev/null
+++ b/README.md
@@ -0,0 +1,19 @@
+printbin - A quick utility to print a number in it's binary representation.
+
+Usage:
+    
+    Print a 16 bit representation:
+
+        $ printbin -b 16 1234
+        |>  00000100 11010010
+
+    Print an 8 bit representation of a base 16 number
+        $ printbin -b 8 -a 16 5a
+        |>  01011010
+
+    Accept input and output binary number;
+        $ printbin
+            >   333
+        |>   00000000 00000000 00000000 00000000 00000000 00000000 00000001 01001101
+
+printbin always prints a base 10 number up to 64 bits, unless the number of bits is set with -b, or the base is set with -a.

diff --git a/printbin.c b/printbin.c
new file mode 100644 (file)
index 0000000..e0c1261
--- /dev/null
+++ b/printbin.c
@@ -0,0 +1,59 @@
+#include "printbin.h"
+
+int main(int argc, char *argv[]){
+    char *a = malloc(20*sizeof(char));
+    char *b = malloc(20*sizeof(char));
+    char *n = malloc(60*sizeof(char));
+    char c;
+    unsigned long num;
+    int bits,base;
+    int x = 0;
+
+    while ((c = getopt (argc, argv, "a:b:")) != -1){
+        switch (c) {
+            /* number base */
+            case 'a':
+                strcpy(a,optarg);
+                x++;
+                break;
+            /* number bits */
+            case 'b':
+                strcpy(b,optarg);
+                x++;
+                break;
+        }
+    }
+    
+    if (x != 0 && argc > 1) strcpy(n,argv[optind]);
+    if (strcmp(n,"") == 0) scanf("%s",n); 
+
+    if (strcmp(a,"") != 0) {
+        base = strtol(a,NULL,10);
+    } else {
+        base = 10;
+    }
+
+    if (strcmp(b,"") != 0) {
+        bits = strtol(b,NULL,10);
+    } else {
+        bits = 64;
+    }
+
+    num = strtol(n,NULL,base);
+
+    printbin(num,bits);
+    return 0;
+}
+
+void printbin(unsigned long i, int n){
+    unsigned long mask = pow(2,n-1);
+
+    for (int t = n-1; t >= 0; t-- ){
+        printf("%i",((i & mask) == 0) ? 0 : 1);
+        printf("%s",(t % 8 == 0) ? " " : "");
+        mask = mask >> 1;
+    }
+    printf("\n");
+
+}
+

diff --git a/printbin.h b/printbin.h
new file mode 100644 (file)
index 0000000..5cf0452
--- /dev/null
+++ b/printbin.h
@@ -0,0 +1,8 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include <unistd.h>
+
+void printbin(unsigned long, int);
+unsigned long getnum (int argc, char **argv);