first commit

main.c

@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "input.h"
+#include "trans.h"
+
+int
+main(int argc, char *argv[])
+{
+    int c, n, dec, hlp;
+    char *prog = *argv;
+    unsigned char *b;
+    FILE *fp;
+
+    dec = hlp = 0;
+    while (--argc > 0 && (*++argv)[0] == '-')
+        while ((c = *++argv[0]))
+            switch (c) {
+                case 'd':
+                    dec = 1;
+                    break;
+                case 'h':
+                    hlp = 1;
+                    break;
+                default:
+                    fprintf(stderr, "%s: illegal option %c\n", prog, c);
+                    exit(EXIT_FAILURE);
+                    break;
+            }
+    if (hlp) {
+        fprintf(stdout, "Usage: %s -d -h file\n", prog);
+    } else if (argc != 1) {
+        if (dec) {
+            while ((b = getsxts(stdin, &n))) {
+                    b = decode(b, &n);
+                    fwrite(b, sizeof(*b), n, stdout);
+            }
+        } else {
+            while ((b = getocts(stdin, &n)))
+                    printf("%s", encode(b, n));
+        }
+    } else {
+        if ((fp = fopen(*argv, "r")) == NULL) {
+            fprintf(stderr, "%s: can't open %s\n", prog, *argv);
+            exit(EXIT_FAILURE);
+        }
+        else if (dec) {
+            while ((b = getsxts(fp, &n))) {
+                    b = decode(b, &n);
+                    fwrite(b, sizeof(*b), n, stdout);
+            }
+        } else {
+            while ((b = getocts(fp, &n)))
+                    printf("%s", encode(b, n));
+        }
+        fclose(fp);
+    }
+    exit(EXIT_SUCCESS);
+}