2 .\" Copyright (c) 2000 Poul Henning Kamp and Dag-Erling Coïdan Smørgrav
3 .\" All rights reserved.
5 .\" Redistribution and use in source and binary forms, with or without
6 .\" modification, are permitted provided that the following conditions
8 .\" 1. Redistributions of source code must retain the above copyright
9 .\" notice, this list of conditions and the following disclaimer.
10 .\" 2. Redistributions in binary form must reproduce the above copyright
11 .\" notice, this list of conditions and the following disclaimer in the
12 .\" documentation and/or other materials provided with the distribution.
14 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 .Nd safe string formatting
56 .Fn sbuf_new "struct sbuf *s" "char *buf" "int length" "int flags"
58 .Fn sbuf_clear "struct sbuf *s"
60 .Fn sbuf_setpos "struct sbuf *s" "int pos"
62 .Fn sbuf_bcat "struct sbuf *s" "const void *buf" "size_t len"
64 .Fn sbuf_bcopyin "struct sbuf *s" "const void *uaddr" "size_t len"
66 .Fn sbuf_bcpy "struct sbuf *s" "const void *buf" "size_t len"
68 .Fn sbuf_cat "struct sbuf *s" "const char *str"
70 .Fn sbuf_copyin "struct sbuf *s" "const void *uaddr" "size_t len"
72 .Fn sbuf_cpy "struct sbuf *s" "const char *str"
74 .Fn sbuf_printf "struct sbuf *s" "const char *fmt" "..."
76 .Fn sbuf_vprintf "struct sbuf *s" "const char *fmt" "va_list ap"
78 .Fn sbuf_putc "struct sbuf *s" "int c"
80 .Fn sbuf_trim "struct sbuf *s"
82 .Fn sbuf_overflowed "struct sbuf *s"
84 .Fn sbuf_finish "struct sbuf *s"
86 .Fn sbuf_data "struct sbuf *s"
88 .Fn sbuf_len "struct sbuf *s"
90 .Fn sbuf_done "struct sbuf *s"
92 .Fn sbuf_delete "struct sbuf *s"
96 family of functions allows one to safely allocate, construct and
97 release bounded null-terminated strings in kernel space.
98 Instead of arrays of characters, these functions operate on structures
106 function initializes the
108 pointed to by its first argument.
118 argument is a pointer to a buffer in which to store the actual string;
122 will allocate one using
126 is the initial size of the storage buffer.
129 may be comprised of the following flags:
130 .Bl -tag -width ".Dv SBUF_AUTOEXTEND"
132 The storage buffer is fixed at its initial size.
133 Attempting to extend the sbuf beyond this size results in an overflow condition.
134 .It Dv SBUF_AUTOEXTEND
135 This indicates that the storage buffer may be extended as necessary, so long
136 as resources allow, to hold additional data.
143 it must point to an array of at least
146 The result of accessing that array directly while it is in use by the
153 and frees any memory allocated for it.
154 There must be a call to
158 Any attempt to access the sbuf after it has been deleted will fail.
162 function invalidates the contents of the
164 and resets its position to zero.
172 which is a value between zero and one less than the size of the
174 This effectively truncates the sbuf at the new position.
178 function appends the first
180 bytes from the buffer
189 bytes from the specified userland address into the
194 function replaces the contents of the
198 bytes from the buffer
203 function appends the NUL-terminated string
207 at the current position.
211 function copies a NUL-terminated string from the specified userland
216 argument is non-zero, no more than
218 characters (not counting the terminating NUL) are copied; otherwise
219 the entire string, or as much of it as can fit in the
225 function replaces the contents of the
227 with those of the NUL-terminated string
229 This is equivalent to calling
233 or one which position has been reset to zero with
240 function formats its arguments according to the format string pointed
243 and appends the resulting string to the
245 at the current position.
249 function behaves the same as
251 except that the arguments are obtained from the variable-length argument list
256 function appends the character
260 at the current position.
264 function removes trailing whitespace from the
269 function returns a non-zero value if the
275 function null-terminates the
277 and marks it as finished, which means that it may no longer be
290 functions return the actual string and its length, respectively;
292 only works on a finished
295 returns non-zero if the sbuf is finished.
297 If an operation caused an
299 to overflow, most subsequent operations on it will fail until the
305 or its position is reset to a value between 0 and one less than the
306 size of its storage buffer using
308 or it is reinitialized to a sufficiently short string using
314 if it failed to allocate a storage buffer, and a pointer to the new
321 was invalid, and zero otherwise.
329 all return \-1 if the buffer overflowed, and zero otherwise.
332 returns a non-zero value if the buffer overflowed, and zero otherwise.
339 and \-1, respectively, if the buffer overflowed.
342 returns \-1 if copying string from userland failed, and number of bytes
354 family of functions first appeared in
360 family of functions was designed by
361 .An Poul-Henning Kamp Aq phk@FreeBSD.org
363 .An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
364 Additional improvements were suggested by
365 .An Justin T. Gibbs Aq gibbs@FreeBSD.org .
366 Auto-extend support added by
367 .An Kelly Yancey Aq kbyanc@FreeBSD.org .
369 This manual page was written by
370 .An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .