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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 $
50 .Nd safe string formatting
55 .Fn sbuf_new "struct sbuf *s" "char *buf" "int length" "int flags"
57 .Fn sbuf_clear "struct sbuf *s"
59 .Fn sbuf_setpos "struct sbuf *s" "int pos"
61 .Fn sbuf_bcat "struct sbuf *s" "const char *str" "size_t len"
63 .Fn sbuf_bcopyin "struct sbuf *s" "const void *uaddr" "size_t len"
65 .Fn sbuf_bcpy "struct sbuf *s" "const char *str" "size_t len"
67 .Fn sbuf_cat "struct sbuf *s" "const char *str"
69 .Fn sbuf_copyin "struct sbuf *s" "const void *uaddr" "size_t len"
71 .Fn sbuf_cpy "struct sbuf *s" "const char *str"
73 .Fn sbuf_printf "struct sbuf *s" "const char *fmt" "..."
75 .Fn sbuf_vprintf "struct sbuf *s" "const char *fmt" "va_list ap"
77 .Fn sbuf_putc "struct sbuf *s" "int c"
79 .Fn sbuf_trim "struct sbuf *s"
81 .Fn sbuf_overflowed "struct sbuf *s"
83 .Fn sbuf_finish "struct sbuf *s"
85 .Fn sbuf_data "struct sbuf *s"
87 .Fn sbuf_len "struct sbuf *s"
89 .Fn sbuf_delete "struct sbuf *s"
93 family of functions allows one to safely allocate, construct and
94 release bounded null-terminated strings in kernel space.
95 Instead of arrays of characters, these functions operate on structures
103 function initializes the
105 pointed to by its first argument.
115 argument is a pointer to a buffer in which to store the actual string;
119 will allocate one using
123 is the initial size of the storage buffer.
126 may be comprised of the following flags:
127 .Bl -tag -width ".Dv SBUF_AUTOEXTEND"
129 The storage buffer is fixed at its initial size.
130 Attempting to extend the sbuf beyond this size results in an overflow condition.
131 .It Dv SBUF_AUTOEXTEND
132 This indicates that the storage buffer may be extended as necessary, so long
133 as resources allow, to hold additional data.
140 it must point to an array of at least
143 The contents of the provided buffer are undefined; to retrieve the sbuf data
145 must be called on the finished
150 function invalidates the contents of the
152 and resets its position to zero.
160 which is a value between zero and one less than the size of the
162 This effectively truncates the sbuf at the new position.
166 function appends the first
168 bytes from the byte string
177 bytes from the specified userland address into the
182 function replaces the contents of the
186 bytes from the byte string
191 function appends the NUL-terminated string
195 at the current position.
199 function copies a NUL-terminated string from the specified userland
204 argument is non-zero, no more than
206 characters (not counting the terminating NUL) are copied; otherwise
207 the entire string, or as much of it as can fit in the
213 function replaces the contents of the
215 with those of the NUL-terminated string
217 This is equivalent to calling
221 or one which position has been reset to zero with
228 function formats its arguments according to the format string pointed
231 and appends the resulting string to the
233 at the current position.
237 function behaves the same as
239 except that the arguments are obtained from the variable-length argument list
244 function appends the character
248 at the current position.
252 function removes trailing whitespace from the
257 function returns a non-zero value if the
263 function null-terminates the
265 and marks it as finished, which means that it may no longer be
278 functions return the actual string and its length, respectively;
280 only works on a finished
287 and frees its storage buffer if it was allocated by
290 If an operation caused an
292 to overflow, most subsequent operations on it will fail until the
298 or its position is reset to a value between 0 and one less than the
299 size of its storage buffer using
301 or it is reinitialized to a sufficiently short string using
307 if it failed to allocate a storage buffer, and a pointer to the new
314 was invalid, and zero otherwise.
322 all return \-1 if the buffer overflowed, and zero otherwise.
325 returns a non-zero value if the buffer overflowed, and zero otherwise.
332 and \-1, respectively, if the buffer overflowed.
343 family of functions first appeared in
349 family of functions was designed by
350 .An Poul-Henning Kamp Aq phk@FreeBSD.org
352 .An Dag-Erling Co\(:idan Sm\(/orgrav Aq des@FreeBSD.org .
353 Additional improvements were suggested by
354 .An Justin T. Gibbs Aq gibbs@FreeBSD.org .
355 Auto-extend support added by
356 .An Kelly Yancey Aq kbyanc@FreeBSD.org .
358 This manual page was written by
359 .An Dag-Erling Co\(:idan Sm\(/orgrav .