1 files changed, 117 insertions, 0 deletions
diff --git a/src/util/mvect.c b/src/util/mvect.c
new file mode 100644
index 0000000..cf4b0d5
--- /dev/null
+++ b/src/util/mvect.c
@@ -0,0 +1,117 @@
+/*++
+/* NAME
+/*	mvect 3
+/* SUMMARY
+/*	memory vector management
+/* SYNOPSIS
+/*	#include <mvect.h>
+/*
+/*	char	*mvect_alloc(vector, elsize, nelm, init_fn, wipe_fn)
+/*	MVECT	*vector;
+/*	ssize_t	elsize;
+/*	ssize_t	nelm;
+/*	void	(*init_fn)(char *ptr, ssize_t count);
+/*	void	(*wipe_fn)(char *ptr, ssize_t count);
+/*
+/*	char	*mvect_realloc(vector, nelm)
+/*	MVECT	*vector;
+/*	ssize_t	nelm;
+/*
+/*	char	*mvect_free(vector)
+/*	MVECT	*vector;
+/* DESCRIPTION
+/*	This module supports memory management for arrays of arbitrary
+/*	objects.  It is up to the application to provide specific code
+/*	that initializes and uses object memory.
+/*
+/*	mvect_alloc() initializes memory for a vector with elements
+/*	of \fIelsize\fR bytes, and with at least \fInelm\fR elements.
+/*	\fIinit_fn\fR is a null pointer, or a pointer to a function
+/*	that initializes \fIcount\fR vector elements.
+/*	\fIwipe_fn\fR is a null pointer, or a pointer to a function
+/*	that is complementary to \fIinit_fn\fR. This routine is called
+/*	by mvect_free(). The result of mvect_alloc() is a pointer to
+/*	the allocated vector.
+/*
+/*	mvect_realloc() guarantees that the specified vector has space
+/*	for at least \fInelm\fR elements. The result is a pointer to the
+/*	allocated vector, which may change across calls.
+/*
+/*	mvect_free() releases storage for the named vector. The result
+/*	is a convenient null pointer.
+/* SEE ALSO
+/*	mymalloc(3) memory management
+/* DIAGNOSTICS
+/*	Problems are reported via the msg(3) diagnostics routines:
+/*	the requested amount of memory is not available; improper use
+/*	is detected; other fatal errors.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+
+/* Utility library. */
+
+#include "mymalloc.h"
+#include "mvect.h"
+
+/* mvect_alloc - allocate memory vector */
+
+char   *mvect_alloc(MVECT *vect, ssize_t elsize, ssize_t nelm,
+               void (*init_fn) (char *, ssize_t), void (*wipe_fn) (char *, ssize_t))
+{
+    vect->init_fn = init_fn;
+    vect->wipe_fn = wipe_fn;
+    vect->nelm = 0;
+    vect->ptr = mymalloc(elsize * nelm);
+    vect->nelm = nelm;
+    vect->elsize = elsize;
+    if (vect->init_fn)
+	vect->init_fn(vect->ptr, vect->nelm);
+    return (vect->ptr);
+}
+
+/* mvect_realloc - adjust memory vector allocation */
+
+char   *mvect_realloc(MVECT *vect, ssize_t nelm)
+{
+    ssize_t old_len = vect->nelm;
+    ssize_t incr = nelm - old_len;
+    ssize_t new_nelm;
+
+    if (incr > 0) {
+	if (incr < old_len)
+	    incr = old_len;
+	new_nelm = vect->nelm + incr;
+	vect->ptr = myrealloc(vect->ptr, vect->elsize * new_nelm);
+	vect->nelm = new_nelm;
+	if (vect->init_fn)
+	    vect->init_fn(vect->ptr + old_len * vect->elsize, incr);
+    }
+    return (vect->ptr);
+}
+
+/* mvect_free - release memory vector storage */
+
+char   *mvect_free(MVECT *vect)
+{
+    if (vect->wipe_fn)
+	vect->wipe_fn(vect->ptr, vect->nelm);
+    myfree(vect->ptr);
+    return (0);
+}