--- /dev/null
+/*-
+ * Copyright (c) 2000 Poul-Henning Kamp and Dag-Erling Coïdan Smørgrav
+ * 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
+ * in this position and unchanged.
+ * 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. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ *
+ * $Id$
+ * $FreeBSD: src/sys/sys/sbuf.h,v 1.14 2004/07/09 11:35:30 des Exp $
+ */
+
+#ifndef SBUF_H_INCLUDED
+#define SBUF_H_INCLUDED
+
+/*
+ * Structure definition
+ */
+struct sbuf {
+ char *s_buf; /* storage buffer */
+ void *s_unused; /* binary compatibility. */
+ int s_size; /* size of storage buffer */
+ int s_len; /* current length of string */
+#define SBUF_FIXEDLEN 0x00000000 /* fixed length buffer (default) */
+#define SBUF_AUTOEXTEND 0x00000001 /* automatically extend buffer */
+#define SBUF_USRFLAGMSK 0x0000ffff /* mask of flags the user may specify */
+#define SBUF_DYNAMIC 0x00010000 /* s_buf must be freed */
+#define SBUF_FINISHED 0x00020000 /* set by sbuf_finish() */
+#define SBUF_OVERFLOWED 0x00040000 /* sbuf overflowed */
+#define SBUF_DYNSTRUCT 0x00080000 /* sbuf must be freed */
+ int s_flags; /* flags */
+};
+
+__BEGIN_DECLS
+/*
+ * API functions
+ */
+struct sbuf *sbuf_new(struct sbuf *, char *, int, int);
+void sbuf_clear(struct sbuf *);
+int sbuf_setpos(struct sbuf *, int);
+int sbuf_bcat(struct sbuf *, const void *, size_t);
+int sbuf_bcpy(struct sbuf *, const void *, size_t);
+int sbuf_cat(struct sbuf *, const char *);
+int sbuf_cpy(struct sbuf *, const char *);
+int sbuf_printf(struct sbuf *, const char *, ...) /* __printflike(2, 3) */;
+#ifdef va_start
+int sbuf_vprintf(struct sbuf *, const char *, va_list) /* __printflike(2, 0) */;
+#endif
+int sbuf_putc(struct sbuf *, int);
+int sbuf_trim(struct sbuf *);
+int sbuf_overflowed(struct sbuf *);
+void sbuf_finish(struct sbuf *);
+char *sbuf_data(struct sbuf *);
+int sbuf_len(struct sbuf *);
+int sbuf_done(struct sbuf *);
+void sbuf_delete(struct sbuf *);
+__END_DECLS
+
+#endif
--- /dev/null
+/*-
+ * Copyright (c) 2000 Poul-Henning Kamp and Dag-Erling Coïdan Smørgrav
+ * 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
+ * in this position and unchanged.
+ * 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. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ *
+ * $Id$
+ * $FreeBSD: src/sys/kern/subr_sbuf.c,v 1.30 2005/12/23 11:49:53 phk Exp $
+ */
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sbuf.h"
+
+#define KASSERT(e, m)
+#define SBMALLOC(size) malloc(size)
+#define SBFREE(buf) free(buf)
+#define min(x,y) (x < y ? x : y)
+
+/*
+ * Predicates
+ */
+#define SBUF_ISDYNAMIC(s) ((s)->s_flags & SBUF_DYNAMIC)
+#define SBUF_ISDYNSTRUCT(s) ((s)->s_flags & SBUF_DYNSTRUCT)
+#define SBUF_ISFINISHED(s) ((s)->s_flags & SBUF_FINISHED)
+#define SBUF_HASOVERFLOWED(s) ((s)->s_flags & SBUF_OVERFLOWED)
+#define SBUF_HASROOM(s) ((s)->s_len < (s)->s_size - 1)
+#define SBUF_FREESPACE(s) ((s)->s_size - (s)->s_len - 1)
+#define SBUF_CANEXTEND(s) ((s)->s_flags & SBUF_AUTOEXTEND)
+
+/*
+ * Set / clear flags
+ */
+#define SBUF_SETFLAG(s, f) do { (s)->s_flags |= (f); } while (0)
+#define SBUF_CLEARFLAG(s, f) do { (s)->s_flags &= ~(f); } while (0)
+
+#define SBUF_MINEXTENDSIZE 16 /* Should be power of 2. */
+#define SBUF_MAXEXTENDSIZE 4096
+#define SBUF_MAXEXTENDINCR 4096
+
+/*
+ * Debugging support
+ */
+#if !defined(NDEBUG)
+static void
+_assert_sbuf_integrity(const char *fun, struct sbuf *s)
+{
+ KASSERT(s != NULL,
+ ("%s called with a NULL sbuf pointer", fun));
+ KASSERT(s->s_buf != NULL,
+ ("%s called with uninitialized or corrupt sbuf", fun));
+ KASSERT(s->s_len < s->s_size,
+ ("wrote past end of sbuf (%d >= %d)", s->s_len, s->s_size));
+}
+
+static void
+_assert_sbuf_state(const char *fun, struct sbuf *s, int state)
+{
+ KASSERT((s->s_flags & SBUF_FINISHED) == state,
+ ("%s called with %sfinished or corrupt sbuf", fun,
+ (state ? "un" : "")));
+}
+#define assert_sbuf_integrity(s) _assert_sbuf_integrity(__func__, (s))
+#define assert_sbuf_state(s, i) _assert_sbuf_state(__func__, (s), (i))
+#else
+#define assert_sbuf_integrity(s) do { } while (0)
+#define assert_sbuf_state(s, i) do { } while (0)
+#endif
+
+static int
+sbuf_extendsize(int size)
+{
+ int newsize;
+
+ newsize = SBUF_MINEXTENDSIZE;
+ while (newsize < size) {
+ if (newsize < (int)SBUF_MAXEXTENDSIZE)
+ newsize *= 2;
+ else
+ newsize += SBUF_MAXEXTENDINCR;
+ }
+
+ return (newsize);
+}
+
+
+/*
+ * Extend an sbuf.
+ */
+static int
+sbuf_extend(struct sbuf *s, int addlen)
+{
+ char *newbuf;
+ int newsize;
+
+ if (!SBUF_CANEXTEND(s))
+ return (-1);
+
+ newsize = sbuf_extendsize(s->s_size + addlen);
+ newbuf = (char *)SBMALLOC(newsize);
+ if (newbuf == NULL)
+ return (-1);
+ bcopy(s->s_buf, newbuf, s->s_size);
+ if (SBUF_ISDYNAMIC(s))
+ SBFREE(s->s_buf);
+ else
+ SBUF_SETFLAG(s, SBUF_DYNAMIC);
+ s->s_buf = newbuf;
+ s->s_size = newsize;
+ return (0);
+}
+
+/*
+ * Initialize an sbuf.
+ * If buf is non-NULL, it points to a static or already-allocated string
+ * big enough to hold at least length characters.
+ */
+struct sbuf *
+sbuf_new(struct sbuf *s, char *buf, int length, int flags)
+{
+ KASSERT(length >= 0,
+ ("attempt to create an sbuf of negative length (%d)", length));
+ KASSERT((flags & ~SBUF_USRFLAGMSK) == 0,
+ ("%s called with invalid flags", __func__));
+
+ flags &= SBUF_USRFLAGMSK;
+ if (s == NULL) {
+ s = (struct sbuf *)SBMALLOC(sizeof *s);
+ if (s == NULL)
+ return (NULL);
+ bzero(s, sizeof *s);
+ s->s_flags = flags;
+ SBUF_SETFLAG(s, SBUF_DYNSTRUCT);
+ } else {
+ bzero(s, sizeof *s);
+ s->s_flags = flags;
+ }
+ s->s_size = length;
+ if (buf) {
+ s->s_buf = buf;
+ return (s);
+ }
+ if (flags & SBUF_AUTOEXTEND)
+ s->s_size = sbuf_extendsize(s->s_size);
+ s->s_buf = (char *)SBMALLOC(s->s_size);
+ if (s->s_buf == NULL) {
+ if (SBUF_ISDYNSTRUCT(s))
+ SBFREE(s);
+ return (NULL);
+ }
+ SBUF_SETFLAG(s, SBUF_DYNAMIC);
+ return (s);
+}
+
+/*
+ * Clear an sbuf and reset its position.
+ */
+void
+sbuf_clear(struct sbuf *s)
+{
+ assert_sbuf_integrity(s);
+ /* don't care if it's finished or not */
+
+ SBUF_CLEARFLAG(s, SBUF_FINISHED);
+ SBUF_CLEARFLAG(s, SBUF_OVERFLOWED);
+ s->s_len = 0;
+}
+
+/*
+ * Set the sbuf's end position to an arbitrary value.
+ * Effectively truncates the sbuf at the new position.
+ */
+int
+sbuf_setpos(struct sbuf *s, int pos)
+{
+ assert_sbuf_integrity(s);
+ assert_sbuf_state(s, 0);
+
+ KASSERT(pos >= 0,
+ ("attempt to seek to a negative position (%d)", pos));
+ KASSERT(pos < s->s_size,
+ ("attempt to seek past end of sbuf (%d >= %d)", pos, s->s_size));
+
+ if (pos < 0 || pos > s->s_len)
+ return (-1);
+ s->s_len = pos;
+ return (0);
+}
+
+/*
+ * Append a byte string to an sbuf.
+ */
+int
+sbuf_bcat(struct sbuf *s, const void *buf, size_t len)
+{
+ const char *str = buf;
+
+ assert_sbuf_integrity(s);
+ assert_sbuf_state(s, 0);
+
+ if (SBUF_HASOVERFLOWED(s))
+ return (-1);
+
+ for (; len; len--) {
+ if (!SBUF_HASROOM(s) && sbuf_extend(s, len) < 0)
+ break;
+ s->s_buf[s->s_len++] = *str++;
+ }
+ if (len) {
+ SBUF_SETFLAG(s, SBUF_OVERFLOWED);
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * Copy a byte string into an sbuf.
+ */
+int
+sbuf_bcpy(struct sbuf *s, const void *buf, size_t len)
+{
+ assert_sbuf_integrity(s);
+ assert_sbuf_state(s, 0);
+
+ sbuf_clear(s);
+ return (sbuf_bcat(s, buf, len));
+}
+
+/*
+ * Append a string to an sbuf.
+ */
+int
+sbuf_cat(struct sbuf *s, const char *str)
+{
+ assert_sbuf_integrity(s);
+ assert_sbuf_state(s, 0);
+
+ if (SBUF_HASOVERFLOWED(s))
+ return (-1);
+
+ while (*str) {
+ if (!SBUF_HASROOM(s) && sbuf_extend(s, strlen(str)) < 0)
+ break;
+ s->s_buf[s->s_len++] = *str++;
+ }
+ if (*str) {
+ SBUF_SETFLAG(s, SBUF_OVERFLOWED);
+ return (-1);
+ }
+ return (0);
+}
+
+/*
+ * Copy a string into an sbuf.
+ */
+int
+sbuf_cpy(struct sbuf *s, const char *str)
+{
+ assert_sbuf_integrity(s);
+ assert_sbuf_state(s, 0);
+
+ sbuf_clear(s);
+ return (sbuf_cat(s, str));
+}
+
+/*
+ * Format the given argument list and append the resulting string to an sbuf.
+ */
+int
+sbuf_vprintf(struct sbuf *s, const char *fmt, va_list ap)
+{
+ va_list ap_copy;
+ int len;
+
+ assert_sbuf_integrity(s);
+ assert_sbuf_state(s, 0);
+
+ KASSERT(fmt != NULL,
+ ("%s called with a NULL format string", __func__));
+
+ if (SBUF_HASOVERFLOWED(s))
+ return (-1);
+
+ do {
+ va_copy(ap_copy, ap);
+ len = vsnprintf(&s->s_buf[s->s_len], SBUF_FREESPACE(s) + 1,
+ fmt, ap_copy);
+ va_end(ap_copy);
+ } while (len > SBUF_FREESPACE(s) &&
+ sbuf_extend(s, len - SBUF_FREESPACE(s)) == 0);
+
+ /*
+ * s->s_len is the length of the string, without the terminating nul.
+ * When updating s->s_len, we must subtract 1 from the length that
+ * we passed into vsnprintf() because that length includes the
+ * terminating nul.
+ *
+ * vsnprintf() returns the amount that would have been copied,
+ * given sufficient space, hence the min() calculation below.
+ */
+ s->s_len += min(len, SBUF_FREESPACE(s));
+ if (!SBUF_HASROOM(s) && !SBUF_CANEXTEND(s))
+ SBUF_SETFLAG(s, SBUF_OVERFLOWED);
+
+ KASSERT(s->s_len < s->s_size,
+ ("wrote past end of sbuf (%d >= %d)", s->s_len, s->s_size));
+
+ if (SBUF_HASOVERFLOWED(s))
+ return (-1);
+ return (0);
+}
+
+/*
+ * Format the given arguments and append the resulting string to an sbuf.
+ */
+int
+sbuf_printf(struct sbuf *s, const char *fmt, ...)
+{
+ va_list ap;
+ int result;
+
+ va_start(ap, fmt);
+ result = sbuf_vprintf(s, fmt, ap);
+ va_end(ap);
+ return(result);
+}
+
+/*
+ * Append a character to an sbuf.
+ */
+int
+sbuf_putc(struct sbuf *s, int c)
+{
+ assert_sbuf_integrity(s);
+ assert_sbuf_state(s, 0);
+
+ if (SBUF_HASOVERFLOWED(s))
+ return (-1);
+
+ if (!SBUF_HASROOM(s) && sbuf_extend(s, 1) < 0) {
+ SBUF_SETFLAG(s, SBUF_OVERFLOWED);
+ return (-1);
+ }
+ if (c != '\0')
+ s->s_buf[s->s_len++] = c;
+ return (0);
+}
+
+/*
+ * Trim whitespace characters from end of an sbuf.
+ */
+int
+sbuf_trim(struct sbuf *s)
+{
+ assert_sbuf_integrity(s);
+ assert_sbuf_state(s, 0);
+
+ if (SBUF_HASOVERFLOWED(s))
+ return (-1);
+
+ while (s->s_len && isspace(s->s_buf[s->s_len-1]))
+ --s->s_len;
+
+ return (0);
+}
+
+/*
+ * Check if an sbuf overflowed
+ */
+int
+sbuf_overflowed(struct sbuf *s)
+{
+ return SBUF_HASOVERFLOWED(s);
+}
+
+/*
+ * Finish off an sbuf.
+ */
+void
+sbuf_finish(struct sbuf *s)
+{
+ assert_sbuf_integrity(s);
+ assert_sbuf_state(s, 0);
+
+ s->s_buf[s->s_len] = '\0';
+ SBUF_CLEARFLAG(s, SBUF_OVERFLOWED);
+ SBUF_SETFLAG(s, SBUF_FINISHED);
+}
+
+/*
+ * Return a pointer to the sbuf data.
+ */
+char *
+sbuf_data(struct sbuf *s)
+{
+ assert_sbuf_integrity(s);
+ assert_sbuf_state(s, SBUF_FINISHED);
+
+ return s->s_buf;
+}
+
+/*
+ * Return the length of the sbuf data.
+ */
+int
+sbuf_len(struct sbuf *s)
+{
+ assert_sbuf_integrity(s);
+ /* don't care if it's finished or not */
+
+ if (SBUF_HASOVERFLOWED(s))
+ return (-1);
+ return s->s_len;
+}
+
+/*
+ * Clear an sbuf, free its buffer if necessary.
+ */
+void
+sbuf_delete(struct sbuf *s)
+{
+ int isdyn;
+
+ assert_sbuf_integrity(s);
+ /* don't care if it's finished or not */
+
+ if (SBUF_ISDYNAMIC(s))
+ SBFREE(s->s_buf);
+ isdyn = SBUF_ISDYNSTRUCT(s);
+ bzero(s, sizeof *s);
+ if (isdyn)
+ SBFREE(s);
+}
+
+/*
+ * Check if an sbuf has been finished.
+ */
+int
+sbuf_done(struct sbuf *s)
+{
+
+ return(SBUF_ISFINISHED(s));
+}
projects / varnish / commitdiff