b2/: move variable-length strings to vstring.[ch], for sharing

b2/Makefile

@@ -14,7 +14,7 @@ SHELL = /bin/bash
 CFLAGS = -g -Wall $(shell pkg-config --cflags glib-2.0)
 SLOPPY = -Wno-unused -Wno-implicit-function-declaration
 OBJS = boom.o chr.o comp.o db.o dump.o eval.o param.o subex.o subst.o util.o \
-       lex.yy.o y.tab.o
+       vstring.o lex.yy.o y.tab.o
 LDLIBS = -lfl $(shell pkg-config --libs glib-2.0)
 
 YACC = bison -y

b2/subex.c

@@ -17,6 +17,7 @@
 #include <regex.h>
 
 #include "util.h"
+#include "vstring.h"
 #include "lang.h"
 #include "subst.h"
 #include "subex.h"
@@ -31,33 +32,6 @@ static const char *fn = NULL, *f[FIELDS];
 static struct subst jump_end;
 
 
-static void append_n(char **res, int *res_len, const char *s, int len)
-{
-	if (!len)
-		return;
-	*res = realloc(*res, *res_len+len+1);
-	if (!*res)
-		abort();
-	memcpy(*res+*res_len, s, len);
-	*res_len += len;
-	(*res)[*res_len] = 0;
-}
-
-
-static void append(char **res, int *res_len, const char *s)
-{
-	append_n(res, res_len, s, strlen(s));
-}
-
-
-#if 0
-static void append_char(char **res, int *res_len, char c)
-{
-	append_n(res, res_len, &c, 1);
-}
-#endif
-
-
 /*
  * TODO: decide what to do with units
  */

b2/vstring.c

@@ -0,0 +1,37 @@
+/*
+ * vstring.c - Variable-length strings
+ *
+ * Copyright 2012 by Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "vstring.h"
+
+
+void append_n(char **res, int *res_len, const char *s, int len)
+{
+	if (!len)
+		return;
+	if (!*res)
+		*res_len = 0;
+	*res = realloc(*res, *res_len+len+1);
+	if (!*res)
+		abort();
+	memcpy(*res+*res_len, s, len);
+	*res_len += len;
+	(*res)[*res_len] = 0;
+}
+
+
+void append(char **res, int *res_len, const char *s)
+{
+	append_n(res, res_len, s, strlen(s));
+}

b2/vstring.h

@@ -0,0 +1,25 @@
+/*
+ * vstring.h - Variable-length strings
+ *
+ * Copyright 2012 by Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef	VSTRING_H
+#define	VSTRING_H
+
+
+void append_n(char **res, int *res_len, const char *s, int len);
+void append(char **res, int *res_len, const char *s);
+
+
+static inline void append_char(char **res, int *res_len, char c)
+{
+	append_n(res, res_len, &c, 1);
+}
+
+#endif /* !VSTRING_H */