change amalloc so it fills malloc()ed memory with a nun-null pattern, which found a WHOLE BUNCH of places where I was not null-terminating strings but instead was taking advantage of amalloc always zeroing new allocations.

amalloc.c

@@ -63,7 +63,13 @@ acalloc(int count, int size)
 void*
 amalloc(int size)
 {
-    return acalloc(size,1);
+    void *ret = acalloc(1, size);
+
+    if ( ret ) {
+	/* explicitally fill the mallocated memory with a nonzero character */
+	memset(ret, 0x8f, size);
+    }
+    return ret;
 }
 
 

css.c

@@ -57,7 +57,7 @@ mkd_css(Document *d, char **res)
 	    /* null-terminate, then strdup() into a free()able memory
 	     * chunk
 	     */
-	    EXPAND(f) = 0;
+	    COMPLETE(f);
 	    *res = strdup(T(f));
 	}
 	DELETE(f);

cstring.h

@@ -69,6 +69,8 @@
 
 typedef STRING(char) Cstring;
 
+#define COMPLETE(t)	(EXPAND(t) = 0),(S(t)--)
+
 extern void Csputc(int, Cstring *);
 extern int Csprintf(Cstring *, char *, ...);
 extern int Cswrite(Cstring *, char *, int);

generate.c

@@ -408,6 +408,7 @@ linkysize(MMIOT *f, Footnote *ref)
 		EXPAND(width) = c;
 		c = pull(f);
 	    }
+	    COMPLETE(width);
 	}
 	else
 	    pull(f);
@@ -424,6 +425,7 @@ linkysize(MMIOT *f, Footnote *ref)
 		    EXPAND(height) = c;
 		    c = pull(f);
 		}
+		COMPLETE(height);
 	    }
 
 	    if ( isspace(c) )
@@ -502,7 +504,7 @@ linky_extended_attributes(MMIOT *f, struct footnote *p, int start)
 
     while ( (c = pull(f)) != '}' )
 	EXPAND(p->extended_attr) = c;
-    EXPAND(p->extended_attr) = 0;
+    COMPLETE(p->extended_attr);
 }
 
 
@@ -2151,8 +2153,7 @@ mkd_document(Document *p, char **res)
 		/* Add a null byte at the end of the generated html,
 		 * but pretend it doesn't exist.
 		 */
-		EXPAND(p->ctx->out) = 0;
-		--S(p->ctx->out);
+		COMPLETE(p->ctx->out);
 	    }
 	}
 

markdown.c

@@ -169,8 +169,7 @@ splitline(Line *t, int cutpoint)
 	t->next = tmp;
 
 	SUFFIX(tmp->text, T(t->text)+cutpoint, S(t->text)-cutpoint);
-	EXPAND(tmp->text) = 0;
-	S(tmp->text)--;
+	COMPLETE(tmp->text);
 
 	S(t->text) = cutpoint;
     }
@@ -1091,7 +1090,7 @@ footnote_height_and_width(char *s, struct footnote *foot)
 	/* specialcase for % width */
 	if ( s[i] == '%' )
 	    EXPAND(foot->width) = '%';
-	EXPAND(foot->width) = 0;
+	COMPLETE(foot->width);
     }
     if ( s[i] == 'x' ) {
 	i++;
@@ -1099,7 +1098,7 @@ footnote_height_and_width(char *s, struct footnote *foot)
 	    EXPAND(foot->height) = s[i++];
 	if ( s[i] == '%' )
 	    EXPAND(foot->height) = '%';
-	EXPAND(foot->height) = 0;
+	COMPLETE(foot->height);
     }
 }
 #endif
@@ -1129,8 +1128,7 @@ addfootnote(Line *p, MMIOT* f)
     /* keep the footnote label */
     for (j=i=p->dle+1; T(p->text)[j] != ']'; j++)
 	EXPAND(foot->tag) = T(p->text)[j];
-    EXPAND(foot->tag) = 0;
-    S(foot->tag)--;
+    COMPLETE(foot->tag);
 
     /* consume the closing ]: */
     j = nextnonblank(p, j+2);
@@ -1154,8 +1152,7 @@ addfootnote(Line *p, MMIOT* f)
 
     while ( (j < S(p->text)) && !isspace(T(p->text)[j]) )
 	EXPAND(foot->link) = T(p->text)[j++];
-    EXPAND(foot->link) = 0;
-    S(foot->link)--;
+    COMPLETE(foot->link);
     j = nextnonblank(p,j);
 
 #if 0
@@ -1172,6 +1169,7 @@ addfootnote(Line *p, MMIOT* f)
 	if ( T(p->text)[i] == '}' ) {
 	    for ( j++; j < i; j++ )
 		EXPAND(foot->extended_attr) = T(p->text)[j];
+	    COMPLETE(foot->extended_attr);
 	    j++;
 	}
     }
@@ -1198,8 +1196,7 @@ addfootnote(Line *p, MMIOT* f)
 	    --S(foot->title);
 	if ( S(foot->title) )	/* skip trailing quote */
 	    --S(foot->title);
-	EXPAND(foot->title) = 0;
-	--S(foot->title);
+	COMPLETE(foot->title);
     }
 
     ___mkd_freeLine(p);

mkdio.c

@@ -69,8 +69,7 @@ __mkd_enqueue(Document* a, Cstring *line)
 	    ++xp;
 	}
     }
-    EXPAND(p->text) = 0;
-    S(p->text)--;
+    COMPLETE(p->text);
     p->dle = mkd_firstnonblank(p);
 }
 
@@ -337,7 +336,7 @@ mkd_line(char *bfr, int size, char **res, mkd_flag_t* flags)
     mkd_parse_line(bfr, size, &f, flags);
 
     if ( len = S(f.out) ) {
-	EXPAND(f.out) = 0;
+	COMPLETE(f.out);
 	/* strdup() doesn't use amalloc(), so in an amalloc()ed
 	 * build this copies the string safely out of our memory
 	 * paranoia arena.  In a non-amalloc world, it's a spurious

theme.c

@@ -294,8 +294,7 @@ finclude(MMIOT *doc, FILE *out, mkd_flag_t *flags, int whence)
 	EXPAND(include) = c;
 
     if ( c != EOF ) {
-	EXPAND(include) = 0;
-	S(include)--;
+	COMPLETE(include);
 
 	if (( f = fopen(T(include), "r") )) {
 	    while ( (c = getc(f)) != EOF )

toc.c

@@ -97,7 +97,7 @@ mkd_toc(Document *p, char **doc)
     if ( (size = S(res)) > 0 ) {
 	/* null-terminate & strdup into a free()able memory chunk
 	 */
-	EXPAND(res) = 0;
+	COMPLETE(res);
 	*doc = strdup(T(res));
     }
     DELETE(res);

xml.c

@@ -77,9 +77,9 @@ mkd_xml(char *p, int size, char **res)
     /* null terminate, strdup() into a free()able memory block,
      * and return the size of everything except the null terminator
      */
-    EXPAND(f) = 0;
+    COMPLETE(f);
     *res = strdup(T(f));
-    size = S(f)-1;
+    size = S(f);
     DELETE(f);
     return size;
 }