From 5118881e6c5c543eeb856adbcc77394c97170a43 Mon Sep 17 00:00:00 2001
From: Simon Forman <sforman@hushmail.com>
Date: Wed, 1 Feb 2023 17:25:54 -0800
Subject: [PATCH] Handle stretches of blanks.

Don't create zero-length strings.
---
 implementations/C/parser.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/implementations/C/parser.c b/implementations/C/parser.c
index f03996f..9285741 100644
--- a/implementations/C/parser.c
+++ b/implementations/C/parser.c
@@ -5,7 +5,7 @@
 
 
 const char *BLANKS = " \t";
-const char *TEXT = " hi there  fr[ie]nd";
+const char *TEXT = " hi there  fr  [  ie]nd";
 /*                  01234567890123456789
                        ^     ^
 */
@@ -32,18 +32,23 @@ main(void)
 	while (NULL != rest) {
                 /* How many chars have we got? */
 		diff = rest - text;
-                printf("%ld\n", diff);
+                /*printf("%ld\n", diff);*/
 
-                /* Allocate and copy out the substring. */
-                snip = (char *)GC_malloc(diff + 1);
-                strncat(snip, text, diff);
-                printf("%s\n", snip);
+                if (diff) {
+                        /* Allocate and copy out the substring. */
+                        snip = (char *)GC_malloc(diff + 1);
+                        strncat(snip, text, diff);
+                        printf("%s\n", snip);
+                }
 
                 /* The next char is a space or '[' or ']'. */
-                printf("<%c>\n", rest[0]);
+                if ('[' == rest[0] || ']' == rest[0]) {
+                        printf("%c\n", rest[0]);
+                }
 
                 /*  */
                 text = trim_leading_blanks(++rest);
+                /*printf(">>>%s\n\n", text);*/
                 rest = strpbrk(text, " []");
 	}
         printf("%s\n", text);