change Makefile to be stricter

-Og enables better detection of bugs that would only occur in optimized
compilations and allows for slightly lesser than -O1 optimization that
does not interfere with debugging.

Makefile

@@ -1,13 +1,14 @@
-CFLAGS = -g -Wall -Wextra -Werror
+CC = gcc
+CFLAGS = -Og -Wall -Wextra -Werror
 
 objects = main.o input.o output.o encode.o
 
 b64 : $(objects)
-	cc -o b64 $(objects)
+	$(CC) -o b64 $(objects)
 
 main.o input.o : input.h
-main.o output.o : output.h
 main.o encode.o : encode.h
+main.o output.o : output.h
 
 .PHONY : clean
 clean :

main.c

@@ -13,11 +13,12 @@ unsigned char sbuf[SXTETBUF];
 int
 main(int argc, char *argv[])
 {
-    int c, n, l;
+    int c, n, last;
     int dec, url, hlp, wrp;
-    char *prog = *argv;
     FILE *in, *out;
+    char *prog;
 
+    prog = *argv;
     dec = url = hlp = wrp = 0;
     while (--argc > 0 && (*++argv)[0] == '-')
         while ((c = *++argv[0]))
@@ -42,6 +43,7 @@ main(int argc, char *argv[])
     if (hlp) {
         fprintf(stdout, "Usage: %s -duhw infile outfile\n", prog);
     } else {
+        in = out = NULL;
         if (argc >= 1 && (in = fopen(*argv, "r")) == NULL) {
             fprintf(stderr, "%s: can't open %s\n", prog, *argv);
             exit(EXIT_FAILURE);
@@ -51,22 +53,23 @@ main(int argc, char *argv[])
             exit(EXIT_FAILURE);
         }
         if (dec) {
-            while ((n = getsxts((argc >= 1) ? in : stdin, sbuf))) {
+            while ((n = getsxts((in) ? in : stdin, sbuf))) {
                 n = decode(sbuf, n, obuf, url);
-                fwrite(obuf, sizeof(*obuf), n, (argc == 2) ? out : stdout);
+                fwrite(obuf, sizeof(*obuf), n, (out) ? out : stdout);
             }
+        } else if (wrp) {
+            last = 0;
+            while ((n = getocts((in) ? in : stdin, obuf))) {
+                n = encode(obuf, n, sbuf, url);
+                last = printw((out) ? out : stdout, sbuf, n);
+            }
+            if (last != '\n')
+                fprintf((out) ? out : stdout, "\n");
         } else {
-            while ((n = getocts((argc >= 1) ? in : stdin, obuf))) {
-                if (wrp) {
-                    n = encode(obuf, n, sbuf, url);
-                    l = printw((argc == 2) ? out : stdout, sbuf, n);
-                } else {
-                    encode(obuf, n, sbuf, url);
-                    fprintf((argc == 2) ? out : stdout, "%s", sbuf);
-                }
+            while ((n = getocts((in) ? in : stdin, obuf))) {
+                encode(obuf, n, sbuf, url);
+                fprintf((out) ? out : stdout, "%s", sbuf);
             }
-            if (wrp && l != '\n')
-                fprintf((argc == 2) ? out : stdout, "\n");
         }
         if (in)
             fclose(in);

output.c

@@ -8,6 +8,7 @@ printw(FILE *fp, unsigned char *s, int slen)
     static int col;
     int c;
 
+    c = '\n';
     while (slen--) {
         fputc((c = *s++), fp);
         ++col;