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26 .\" $FreeBSD: src/share/man/man9/sbuf.9,v 1.12.2.4 2002/09/23 04:51:53 kbyanc Exp $
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 char *str" "size_t len"
64 .Fn sbuf_bcopyin "struct sbuf *s" "const void *uaddr" "size_t len"
66 .Fn sbuf_bcpy "struct sbuf *s" "const char *str" "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 contents of the provided buffer are undefined; to retrieve the sbuf data
148 must be called on the finished
153 function invalidates the contents of the
155 and resets its position to zero.
163 which is a value between zero and one less than the size of the
165 This effectively truncates the sbuf at the new position.
169 function appends the first
171 bytes from the byte string
180 bytes from the specified userland address into the
185 function replaces the contents of the
189 bytes from the byte string
194 function appends the NUL-terminated string
198 at the current position.
202 function copies a NUL-terminated string from the specified userland
207 argument is non-zero, no more than
209 characters (not counting the terminating NUL) are copied; otherwise
210 the entire string, or as much of it as can fit in the
216 function replaces the contents of the
218 with those of the NUL-terminated string
220 This is equivalent to calling
224 or one which position has been reset to zero with
231 function formats its arguments according to the format string pointed
234 and appends the resulting string to the
236 at the current position.
240 function behaves the same as
242 except that the arguments are obtained from the variable-length argument list
247 function appends the character
251 at the current position.
255 function removes trailing whitespace from the
260 function returns a non-zero value if the
266 function null-terminates the
268 and marks it as finished, which means that it may no longer be
281 functions return the actual string and its length, respectively;
283 only works on a finished
286 returns non-zero if the
294 and frees its storage buffer if it was allocated by
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.
350 family of functions first appeared in
356 family of functions was designed by
357 .An Poul-Henning Kamp Aq phk@FreeBSD.org
359 .An Dag-Erling Co\(:idan Sm\(/orgrav Aq des@FreeBSD.org .
360 Additional improvements were suggested by
361 .An Justin T. Gibbs Aq gibbs@FreeBSD.org .
362 Auto-extend support added by
363 .An Kelly Yancey Aq kbyanc@FreeBSD.org .
365 This manual page was written by
366 .An Dag-Erling Co\(:idan Sm\(/orgrav .