mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
5b6db47748
will follow when I've decided whether to keep this API or ditch it in favor of something slightly more subtle.
473 lines
10 KiB
C
473 lines
10 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
|
|
#ifdef _KERNEL
|
|
#include <sys/ctype.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/uio.h>
|
|
#include <machine/stdarg.h>
|
|
#else /* _KERNEL */
|
|
#include <ctype.h>
|
|
#include <stdarg.h>
|
|
#include <stdlib.h>
|
|
#endif /* _KERNEL */
|
|
|
|
#include <sys/sbuf.h>
|
|
|
|
#ifdef _KERNEL
|
|
MALLOC_DEFINE(M_SBUF, "sbuf", "string buffers");
|
|
#define SBMALLOC(size) malloc(size, M_SBUF, M_WAITOK)
|
|
#define SBFREE(buf) free(buf, M_SBUF)
|
|
#else /* _KERNEL */
|
|
#define KASSERT(e, m)
|
|
#define SBMALLOC(size) malloc(size)
|
|
#define SBFREE(buf) free(buf)
|
|
#define min(x,y) MIN(x,y)
|
|
#endif /* _KERNEL */
|
|
|
|
/*
|
|
* 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)
|
|
|
|
/*
|
|
* 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)
|
|
|
|
/*
|
|
* Debugging support
|
|
*/
|
|
#if defined(_KERNEL) && defined(INVARIANTS)
|
|
static void
|
|
_assert_sbuf_integrity(char *fun, struct sbuf *s)
|
|
{
|
|
KASSERT(s != NULL,
|
|
("%s called with a NULL sbuf pointer", fun));
|
|
KASSERT(s->s_buf != NULL,
|
|
("%s called with unitialized 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(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(__FUNCTION__, (s))
|
|
#define assert_sbuf_state(s, i) _assert_sbuf_state(__FUNCTION__, (s), (i))
|
|
#else /* _KERNEL && INVARIANTS */
|
|
#define assert_sbuf_integrity(s) do { } while (0)
|
|
#define assert_sbuf_state(s, i) do { } while (0)
|
|
#endif /* _KERNEL && INVARIANTS */
|
|
|
|
/*
|
|
* 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 == 0,
|
|
(__FUNCTION__ " called with non-zero flags"));
|
|
|
|
if (s == NULL) {
|
|
s = (struct sbuf *)SBMALLOC(sizeof *s);
|
|
if (s == NULL)
|
|
return (NULL);
|
|
bzero(s, sizeof *s);
|
|
SBUF_SETFLAG(s, SBUF_DYNSTRUCT);
|
|
} else {
|
|
bzero(s, sizeof *s);
|
|
}
|
|
s->s_size = length;
|
|
if (buf) {
|
|
s->s_buf = buf;
|
|
return (s);
|
|
}
|
|
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);
|
|
}
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* Create an sbuf with uio data
|
|
*/
|
|
struct sbuf *
|
|
sbuf_uionew(struct sbuf *s, struct uio *uio, int *error)
|
|
{
|
|
KASSERT(uio != NULL,
|
|
(__FUNCTION__ " called with NULL uio pointer"));
|
|
KASSERT(error != NULL,
|
|
(__FUNCTION__ " called with NULL error pointer"));
|
|
|
|
s = sbuf_new(s, NULL, uio->uio_resid + 1, 0);
|
|
if (s == NULL) {
|
|
*error = ENOMEM;
|
|
return (NULL);
|
|
}
|
|
*error = uiomove(s->s_buf, uio->uio_resid, uio);
|
|
if (*error != 0) {
|
|
sbuf_delete(s);
|
|
return (NULL);
|
|
}
|
|
s->s_len = s->s_size - 1;
|
|
*error = 0;
|
|
return (s);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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 position to an arbitrary value
|
|
*/
|
|
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 char *str, size_t len)
|
|
{
|
|
assert_sbuf_integrity(s);
|
|
assert_sbuf_state(s, 0);
|
|
|
|
if (SBUF_HASOVERFLOWED(s))
|
|
return (-1);
|
|
|
|
while (len-- && SBUF_HASROOM(s))
|
|
s->s_buf[s->s_len++] = *str++;
|
|
if (len) {
|
|
SBUF_SETFLAG(s, SBUF_OVERFLOWED);
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* Copy a byte string from userland into an sbuf.
|
|
*/
|
|
int
|
|
sbuf_bcopyin(struct sbuf *s, const void *uaddr, size_t len)
|
|
{
|
|
assert_sbuf_integrity(s);
|
|
assert_sbuf_state(s, 0);
|
|
|
|
if (SBUF_HASOVERFLOWED(s))
|
|
return (-1);
|
|
|
|
if (len == 0)
|
|
return (0);
|
|
if (len > (s->s_size - s->s_len - 1))
|
|
len = s->s_size - s->s_len - 1;
|
|
if (copyin(uaddr, s->s_buf + s->s_len, len) != 0)
|
|
return (-1);
|
|
s->s_len += len;
|
|
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Copy a byte string into an sbuf.
|
|
*/
|
|
int
|
|
sbuf_bcpy(struct sbuf *s, const char *str, size_t len)
|
|
{
|
|
assert_sbuf_integrity(s);
|
|
assert_sbuf_state(s, 0);
|
|
|
|
sbuf_clear(s);
|
|
return (sbuf_bcat(s, str, 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 && SBUF_HASROOM(s))
|
|
s->s_buf[s->s_len++] = *str++;
|
|
if (*str) {
|
|
SBUF_SETFLAG(s, SBUF_OVERFLOWED);
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* Copy a string from userland into an sbuf.
|
|
*/
|
|
int
|
|
sbuf_copyin(struct sbuf *s, const void *uaddr, size_t len)
|
|
{
|
|
size_t done;
|
|
|
|
assert_sbuf_integrity(s);
|
|
assert_sbuf_state(s, 0);
|
|
|
|
if (SBUF_HASOVERFLOWED(s))
|
|
return (-1);
|
|
|
|
if (len == 0 || len > (s->s_size - s->s_len - 1))
|
|
len = s->s_size - s->s_len - 1;
|
|
switch (copyinstr(uaddr, s->s_buf + s->s_len, len + 1, &done)) {
|
|
case ENAMETOOLONG:
|
|
SBUF_SETFLAG(s, SBUF_OVERFLOWED);
|
|
/* fall through */
|
|
case 0:
|
|
s->s_len += done - 1;
|
|
break;
|
|
default:
|
|
return (-1); /* XXX */
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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 arguments and append the resulting string to an sbuf.
|
|
*/
|
|
int
|
|
sbuf_printf(struct sbuf *s, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int len;
|
|
|
|
assert_sbuf_integrity(s);
|
|
assert_sbuf_state(s, 0);
|
|
|
|
KASSERT(fmt != NULL,
|
|
(__FUNCTION__ " called with a NULL format string"));
|
|
|
|
if (SBUF_HASOVERFLOWED(s))
|
|
return (-1);
|
|
|
|
va_start(ap, fmt);
|
|
len = vsnprintf(&s->s_buf[s->s_len], s->s_size - s->s_len, fmt, ap);
|
|
va_end(ap);
|
|
|
|
/*
|
|
* 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, s->s_size - s->s_len - 1);
|
|
if (!SBUF_HASROOM(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);
|
|
}
|
|
|
|
/*
|
|
* 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_SETFLAG(s, SBUF_OVERFLOWED);
|
|
return (-1);
|
|
}
|
|
if (c != '\0')
|
|
s->s_buf[s->s_len++] = c;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Trim whitespace characters from 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)
|
|
{
|
|
assert_sbuf_integrity(s);
|
|
/* don't care if it's finished or not */
|
|
|
|
if (SBUF_ISDYNAMIC(s))
|
|
SBFREE(s->s_buf);
|
|
bzero(s, sizeof *s);
|
|
if (SBUF_ISDYNSTRUCT(s))
|
|
SBFREE(s);
|
|
}
|