BSD 4.4 Lite Usr.bin Sources

1 files changed, 129 insertions, 0 deletions

diff --git a/usr.bin/mail/strings.c b/usr.bin/mail/strings.c
new file mode 100644
index 0000000..f27b959
--- /dev/null
+++ b/usr.bin/mail/strings.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 1980, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)strings.c	8.1 (Berkeley) 6/6/93";
+#endif /* not lint */
+
+/*
+ * Mail -- a mail program
+ *
+ * String allocation routines.
+ * Strings handed out here are reclaimed at the top of the command
+ * loop each time, so they need not be freed.
+ */
+
+#include "rcv.h"
+#include "extern.h"
+
+/*
+ * Allocate size more bytes of space and return the address of the
+ * first byte to the caller.  An even number of bytes are always
+ * allocated so that the space will always be on a word boundary.
+ * The string spaces are of exponentially increasing size, to satisfy
+ * the occasional user with enormous string size requests.
+ */
+
+char *
+salloc(size)
+	int size;
+{
+	register char *t;
+	register int s;
+	register struct strings *sp;
+	int index;
+
+	s = size;
+	s += 3;
+	s &= ~03;
+	index = 0;
+	for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
+		if (sp->s_topFree == NOSTR && (STRINGSIZE << index) >= s)
+			break;
+		if (sp->s_nleft >= s)
+			break;
+		index++;
+	}
+	if (sp >= &stringdope[NSPACE])
+		panic("String too large");
+	if (sp->s_topFree == NOSTR) {
+		index = sp - &stringdope[0];
+		sp->s_topFree = malloc(STRINGSIZE << index);
+		if (sp->s_topFree == NOSTR) {
+			fprintf(stderr, "No room for space %d\n", index);
+			panic("Internal error");
+		}
+		sp->s_nextFree = sp->s_topFree;
+		sp->s_nleft = STRINGSIZE << index;
+	}
+	sp->s_nleft -= s;
+	t = sp->s_nextFree;
+	sp->s_nextFree += s;
+	return(t);
+}
+
+/*
+ * Reset the string area to be empty.
+ * Called to free all strings allocated
+ * since last reset.
+ */
+void
+sreset()
+{
+	register struct strings *sp;
+	register int index;
+
+	if (noreset)
+		return;
+	index = 0;
+	for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
+		if (sp->s_topFree == NOSTR)
+			continue;
+		sp->s_nextFree = sp->s_topFree;
+		sp->s_nleft = STRINGSIZE << index;
+		index++;
+	}
+}
+
+/*
+ * Make the string area permanent.
+ * Meant to be called in main, after initialization.
+ */
+void
+spreserve()
+{
+	register struct strings *sp;
+
+	for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++)
+		sp->s_topFree = NOSTR;
+}