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52 .Nd safe string formatting
57 .Fn sbuf_new "struct sbuf *s" "char *buf" "int length" "int flags"
59 .Fn sbuf_clear "struct sbuf *s"
61 .Fn sbuf_setpos "struct sbuf *s" "int pos"
63 .Fn sbuf_bcat "struct sbuf *s" "const void *buf" "size_t len"
65 .Fn sbuf_bcopyin "struct sbuf *s" "const void *uaddr" "size_t len"
67 .Fn sbuf_bcpy "struct sbuf *s" "const void *buf" "size_t len"
69 .Fn sbuf_cat "struct sbuf *s" "const char *str"
71 .Fn sbuf_copyin "struct sbuf *s" "const void *uaddr" "size_t len"
73 .Fn sbuf_cpy "struct sbuf *s" "const char *str"
75 .Fn sbuf_printf "struct sbuf *s" "const char *fmt" "..."
77 .Fn sbuf_vprintf "struct sbuf *s" "const char *fmt" "va_list ap"
79 .Fn sbuf_putc "struct sbuf *s" "int c"
81 .Fn sbuf_trim "struct sbuf *s"
83 .Fn sbuf_overflowed "struct sbuf *s"
85 .Fn sbuf_finish "struct sbuf *s"
87 .Fn sbuf_data "struct sbuf *s"
89 .Fn sbuf_len "struct sbuf *s"
91 .Fn sbuf_done "struct sbuf *s"
93 .Fn sbuf_delete "struct sbuf *s"
97 family of functions allows one to safely allocate, construct and
98 release bounded null-terminated strings in kernel space.
99 Instead of arrays of characters, these functions operate on structures
107 function initializes the
109 pointed to by its first argument.
119 argument is a pointer to a buffer in which to store the actual string;
123 will allocate one using
127 is the initial size of the storage buffer.
130 may be comprised of the following flags:
131 .Bl -tag -width ".Dv SBUF_AUTOEXTEND"
133 The storage buffer is fixed at its initial size.
134 Attempting to extend the sbuf beyond this size results in an overflow condition.
135 .It Dv SBUF_AUTOEXTEND
136 This indicates that the storage buffer may be extended as necessary, so long
137 as resources allow, to hold additional data.
144 it must point to an array of at least
147 The result of accessing that array directly while it is in use by the
154 and frees any memory allocated for it.
155 There must be a call to
159 Any attempt to access the sbuf after it has been deleted will fail.
163 function invalidates the contents of the
165 and resets its position to zero.
173 which is a value between zero and one less than the size of the
175 This effectively truncates the sbuf at the new position.
179 function appends the first
181 bytes from the buffer
190 bytes from the specified userland address into the
195 function replaces the contents of the
199 bytes from the buffer
204 function appends the NUL-terminated string
208 at the current position.
212 function copies a NUL-terminated string from the specified userland
217 argument is non-zero, no more than
219 characters (not counting the terminating NUL) are copied; otherwise
220 the entire string, or as much of it as can fit in the
226 function replaces the contents of the
228 with those of the NUL-terminated string
230 This is equivalent to calling
234 or one which position has been reset to zero with
241 function formats its arguments according to the format string pointed
244 and appends the resulting string to the
246 at the current position.
250 function behaves the same as
252 except that the arguments are obtained from the variable-length argument list
257 function appends the character
261 at the current position.
265 function removes trailing whitespace from the
270 function returns a non-zero value if the
276 function null-terminates the
278 and marks it as finished, which means that it may no longer be
291 functions return the actual string and its length, respectively;
293 only works on a finished
296 returns non-zero if the sbuf is finished.
298 If an operation caused an
300 to overflow, most subsequent operations on it will fail until the
306 or its position is reset to a value between 0 and one less than the
307 size of its storage buffer using
309 or it is reinitialized to a sufficiently short string using
316 if it failed to allocate a storage buffer, and a pointer to the new
322 function returns \-1 if
324 was invalid, and zero otherwise.
334 all return \-1 if the buffer overflowed, and zero otherwise.
339 returns a non-zero value if the buffer overflowed, and zero otherwise.
347 and \-1, respectively, if the buffer overflowed.
352 returns \-1 if copying string from userland failed, and number of bytes
364 family of functions first appeared in
370 family of functions was designed by
371 .An Poul-Henning Kamp Aq phk@FreeBSD.org
373 .An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
374 Additional improvements were suggested by
375 .An Justin T. Gibbs Aq gibbs@FreeBSD.org .
376 Auto-extend support added by
377 .An Kelly Yancey Aq kbyanc@FreeBSD.org .
379 This manual page was written by
380 .An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .