shell_cmds-198.tar.gz

[apple/shell_cmds.git] / sh / memalloc.h

diff --git a/sh/memalloc.h b/sh/memalloc.h
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+/*-
+ * Copyright (c) 1991, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * 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.
+ * 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.
+ *
+ *     @(#)memalloc.h  8.2 (Berkeley) 5/4/95
+ * $FreeBSD$
+ */
+
+#include <string.h>
+
+struct stackmark {
+       struct stack_block *stackp;
+       char *stacknxt;
+       int stacknleft;
+};
+
+
+extern char *stacknxt;
+extern int stacknleft;
+extern char *sstrend;
+
+pointer ckmalloc(size_t);
+pointer ckrealloc(pointer, int);
+void ckfree(pointer);
+char *savestr(const char *);
+pointer stalloc(int);
+void stunalloc(pointer);
+char *stsavestr(const char *);
+void setstackmark(struct stackmark *);
+void popstackmark(struct stackmark *);
+char *growstackstr(void);
+char *makestrspace(int, char *);
+char *stputbin(const char *data, size_t len, char *p);
+char *stputs(const char *data, char *p);
+
+
+
+#define stackblock() stacknxt
+#define stackblocksize() stacknleft
+#define grabstackblock(n) stalloc(n)
+#define STARTSTACKSTR(p)       p = stackblock()
+#define STPUTC(c, p)   do { if (p == sstrend) p = growstackstr(); *p++ = (c); } while(0)
+#define CHECKSTRSPACE(n, p)    { if ((size_t)(sstrend - p) < n) p = makestrspace(n, p); }
+#define USTPUTC(c, p)  (*p++ = (c))
+/*
+ * STACKSTRNUL's use is where we want to be able to turn a stack
+ * (non-sentinel, character counting string) into a C string,
+ * and later pretend the NUL is not there.
+ * Note: Because of STACKSTRNUL's semantics, STACKSTRNUL cannot be used
+ * on a stack that will grabstackstr()ed.
+ */
+#define STACKSTRNUL(p) (p == sstrend ? (p = growstackstr(), *p = '\0') : (*p = '\0'))
+#define STUNPUTC(p)    (--p)
+#define STTOPC(p)      p[-1]
+#define STADJUST(amount, p)    (p += (amount))
+#define grabstackstr(p)        stalloc((char *)p - stackblock())
+#define ungrabstackstr(s, p)   stunalloc((s))
+#define STPUTBIN(s, len, p)    p = stputbin((s), (len), p)
+#define STPUTS(s, p)   p = stputs((s), p)