[hackers] [sbase] od: Don't modify bytes in the line for the 'a' type || Michael Forney

[git]

commit f83c468b558d87ca27e99d7d8559eec3281a33c6
Author:     Michael Forney <mfor...@mforney.org>
AuthorDate: Sun Feb 25 12:56:36 2018 -0800
Commit:     Michael Forney <mfor...@mforney.org>
CommitDate: Sun Feb 25 23:01:00 2018 -0800

    od: Don't modify bytes in the line for the 'a' type
    
    Subsequent types should still print the full 8-bit value.

diff --git a/od.c b/od.c
index e5dde83..eb63318 100644
--- a/od.c
+++ b/od.c
@@ -36,11 +36,12 @@ printaddress(off_t addr)
 }
 
 static void
-printchunk(unsigned char *s, unsigned char format, size_t len)
+printchunk(const unsigned char *s, unsigned char format, size_t len)
 {
        long long res, basefac;
        size_t i;
        char fmt[] = " %#*ll#";
+       unsigned char c;
 
        const char *namedict[] = {
                "nul", "soh", "stx", "etx", "eot", "enq", "ack",
@@ -58,11 +59,11 @@ printchunk(unsigned char *s, unsigned char format, size_t 
len)
 
        switch (format) {
        case 'a':
-               *s &= ~128; /* clear high bit as required by standard */
-               if (*s < LEN(namedict) || *s == 127) {
-                       printf(" %3s", (*s == 127) ? "del" : namedict[*s]);
+               c = *s & ~128; /* clear high bit as required by standard */
+               if (c < LEN(namedict) || c == 127) {
+                       printf(" %3s", (c == 127) ? "del" : namedict[c]);
                } else {
-                       printf(" %3c", *s);
+                       printf(" %3c", c);
                }
                break;
        case 'c':
@@ -91,7 +92,7 @@ printchunk(unsigned char *s, unsigned char format, size_t len)
 }
 
 static void
-printline(unsigned char *line, size_t len, off_t addr)
+printline(const unsigned char *line, size_t len, off_t addr)
 {
        struct type *t = NULL;
        size_t i;