initial commit <3

main.c

@@ -0,0 +1,44 @@
+#include "stdio.h"
+#include "stdlib.h"
+#include "limits.h"
+#include "sodium.h"
+#include "strtoui.h"
+
+int map(int i, int i_min, int i_max, int o_min, int o_max) {
+    double r = (double)(o_max - o_min) / (double)(i_max - i_min);
+    int j = (double) (i - i_min) * r + o_min;
+    return j;
+}
+
+int main(int argc, char *argv[]) {
+    if(argc == 1) {
+        puts("Usage: chars [length]");
+        puts("       Max length is 1024");
+        exit(EXIT_SUCCESS);
+    }
+
+    unsigned int len;
+    enum strtoui_error error = strtoui(&len, argv[1], 10);
+    if(error != STRTOUI_SUCCESS){
+        fputs("Bad input\n", stderr);
+        exit(EXIT_FAILURE);
+    }else if (len > 1024) {
+        fputs("The length is to big\n", stderr);
+        exit(EXIT_FAILURE);
+    }
+
+    char lower_range = 0x20;
+    char upper_range= 0x7e;
+
+    char data[len];
+    randombytes_buf(data, sizeof len);
+
+    for(int i = 0; i < len; i++) {
+        int random = randombytes_uniform(upper_range);
+        data[i] = map(random, 0, upper_range, lower_range, upper_range);
+        printf("%c", data[i]);
+    }
+    printf("\n");
+
+    exit(EXIT_SUCCESS);
+}