patch 8.0.1656: no option to have xxd produce upper case variable names

Problem:    No option to have xxd produce upper case variable names.
Solution:   Add the -C argument. (Matt Panaro closes #2772)

src/version.c

@@ -762,6 +762,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1656,
 /**/
     1655,
 /**/

src/xxd/xxd.c

@@ -215,6 +215,8 @@ char hexxa[] = "0123456789abcdef0123456789ABCDEF", *hexx = hexxa;
 #define HEX_BITS 3		/* not hex a dump, but bits: 01111001 */
 #define HEX_LITTLEENDIAN 4
 
+#define CONDITIONAL_CAPITALIZE(c) (capitalize ? toupper((int)c) : c)
+
 static char *pname;
 
   static void
@@ -225,6 +227,7 @@ exit_with_usage(void)
   fprintf(stderr, "Options:\n");
   fprintf(stderr, "    -a          toggle autoskip: A single '*' replaces nul-lines. Default off.\n");
   fprintf(stderr, "    -b          binary digit dump (incompatible with -ps,-i,-r). Default hex.\n");
+  fprintf(stderr, "    -C          capitalize variable names in C include file style (-i).\n");
   fprintf(stderr, "    -c cols     format <cols> octets per line. Default 16 (-i: 12, -ps: 30).\n");
   fprintf(stderr, "    -E          show characters in EBCDIC. Default ASCII.\n");
   fprintf(stderr, "    -e          little-endian dump (incompatible with -ps,-i,-r).\n");
@@ -459,7 +462,7 @@ main(int argc, char *argv[])
 {
   FILE *fp, *fpo;
   int c, e, p = 0, relseek = 1, negseek = 0, revert = 0;
-  int cols = 0, nonzero = 0, autoskip = 0, hextype = HEX_NORMAL;
+  int cols = 0, nonzero = 0, autoskip = 0, hextype = HEX_NORMAL, capitalize = 0;
   int ebcdic = 0;
   int octspergrp = -1;	/* number of octets grouped in output */
   int grplen;		/* total chars per octet group */
@@ -495,6 +498,7 @@ main(int argc, char *argv[])
       else if (!STRNCMP(pp, "-u", 2)) hexx = hexxa + 16;
       else if (!STRNCMP(pp, "-p", 2)) hextype = HEX_POSTSCRIPT;
       else if (!STRNCMP(pp, "-i", 2)) hextype = HEX_CINCLUDE;
+      else if (!STRNCMP(pp, "-C", 2)) capitalize = 1;
       else if (!STRNCMP(pp, "-r", 2)) revert++;
       else if (!STRNCMP(pp, "-E", 2)) ebcdic++;
       else if (!STRNCMP(pp, "-v", 2))
@@ -722,7 +726,7 @@ main(int argc, char *argv[])
 	  if (fprintf(fpo, "unsigned char %s", isdigit((int)argv[1][0]) ? "__" : "") < 0)
 	    die(3);
 	  for (e = 0; (c = argv[1][e]) != 0; e++)
-	    if (putc(isalnum(c) ? c : '_', fpo) == EOF)
+          if (putc(isalnum(c) ? CONDITIONAL_CAPITALIZE(c) : '_', fpo) == EOF)
 	      die(3);
 	  if (fputs("[] = {\n", fpo) == EOF)
 	    die(3);
@@ -750,9 +754,9 @@ main(int argc, char *argv[])
 	  if (fprintf(fpo, "unsigned int %s", isdigit((int)argv[1][0]) ? "__" : "") < 0)
 	    die(3);
 	  for (e = 0; (c = argv[1][e]) != 0; e++)
-	    if (putc(isalnum(c) ? c : '_', fpo) == EOF)
+        if (putc(isalnum(c) ? CONDITIONAL_CAPITALIZE(c) : '_', fpo) == EOF)
 	      die(3);
-	  if (fprintf(fpo, "_len = %d;\n", p) < 0)
+	  if (fprintf(fpo, "_%s = %d;\n", capitalize ? "LEN" : "len", p) < 0)
 	    die(3);
 	}