diff options
Diffstat (limited to 'usr.sbin/bind/lib/lwres/man/lwres_buffer.3')
| -rw-r--r-- | usr.sbin/bind/lib/lwres/man/lwres_buffer.3 | 272 |
1 files changed, 102 insertions, 170 deletions
diff --git a/usr.sbin/bind/lib/lwres/man/lwres_buffer.3 b/usr.sbin/bind/lib/lwres/man/lwres_buffer.3 index dbd836d1987..3e62b068568 100644 --- a/usr.sbin/bind/lib/lwres/man/lwres_buffer.3 +++ b/usr.sbin/bind/lib/lwres/man/lwres_buffer.3 @@ -1,174 +1,117 @@ -.\" Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC") -.\" Copyright (C) 2000, 2001 Internet Software Consortium. -.\" +.\" Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC") +.\" Copyright (C) 2000, 2001 Internet Software Consortium. +.\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. -.\" +.\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH .\" REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY -.\" AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, +.\" AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, .\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM .\" LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE .\" OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR .\" PERFORMANCE OF THIS SOFTWARE. .\" -.\" $ISC: lwres_buffer.3,v 1.12.2.1.8.1 2004/03/06 07:41:42 marka Exp $ +.\" $ISC: lwres_buffer.3,v 1.12.2.1.8.5 2005/10/13 02:33:58 marka Exp $ .\" -.TH "LWRES_BUFFER" "3" "Jun 30, 2000" "BIND9" "" -.SH NAME +.hy 0 +.ad l +.\" ** You probably do not want to edit this file directly ** +.\" It was generated using the DocBook XSL Stylesheets (version 1.69.1). +.\" Instead of manually editing it, you probably should edit the DocBook XML +.\" source for it and then use the DocBook XSL Stylesheets to regenerate it. +.TH "LWRES_BUFFER" "3" "Jun 30, 2000" "BIND9" "BIND9" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" lwres_buffer_init, lwres_buffer_invalidate, lwres_buffer_add, lwres_buffer_subtract, lwres_buffer_clear, lwres_buffer_first, lwres_buffer_forward, lwres_buffer_back, lwres_buffer_getuint8, lwres_buffer_putuint8, lwres_buffer_getuint16, lwres_buffer_putuint16, lwres_buffer_getuint32, lwres_buffer_putuint32, lwres_buffer_putmem, lwres_buffer_getmem \- lightweight resolver buffer management -.SH SYNOPSIS -\fB#include <lwres/lwbuffer.h> -.sp -.na -void -lwres_buffer_init(lwres_buffer_t *b, void *base, unsigned int length); -.ad -.sp -.na -void -lwres_buffer_invalidate(lwres_buffer_t *b); -.ad -.sp -.na -void -lwres_buffer_add(lwres_buffer_t *b, unsigned int n); -.ad -.sp -.na -void -lwres_buffer_subtract(lwres_buffer_t *b, unsigned int n); -.ad -.sp -.na -void -lwres_buffer_clear(lwres_buffer_t *b); -.ad -.sp -.na -void -lwres_buffer_first(lwres_buffer_t *b); -.ad -.sp -.na -void -lwres_buffer_forward(lwres_buffer_t *b, unsigned int n); -.ad -.sp -.na -void -lwres_buffer_back(lwres_buffer_t *b, unsigned int n); -.ad -.sp -.na -lwres_uint8_t -lwres_buffer_getuint8(lwres_buffer_t *b); -.ad -.sp -.na -void -lwres_buffer_putuint8(lwres_buffer_t *b, lwres_uint8_t val); -.ad -.sp -.na -lwres_uint16_t -lwres_buffer_getuint16(lwres_buffer_t *b); -.ad -.sp -.na -void -lwres_buffer_putuint16(lwres_buffer_t *b, lwres_uint16_t val); -.ad -.sp -.na -lwres_uint32_t -lwres_buffer_getuint32(lwres_buffer_t *b); -.ad -.sp -.na -void -lwres_buffer_putuint32(lwres_buffer_t *b, lwres_uint32_t val); -.ad -.sp -.na -void -lwres_buffer_putmem(lwres_buffer_t *b, const unsigned char *base, unsigned int length); -.ad -.sp -.na -void -lwres_buffer_getmem(lwres_buffer_t *b, unsigned char *base, unsigned int length); -.ad -\fR +.SH "SYNOPSIS" +.nf +#include <lwres/lwbuffer.h> +.fi +.HP 23 +\fBvoid\ \fBlwres_buffer_init\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB, \fR\fBvoid\ *base\fR\fB, \fR\fBunsigned\ int\ length\fR\fB);\fR +.HP 29 +\fBvoid\ \fBlwres_buffer_invalidate\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB);\fR +.HP 22 +\fBvoid\ \fBlwres_buffer_add\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB, \fR\fBunsigned\ int\ n\fR\fB);\fR +.HP 27 +\fBvoid\ \fBlwres_buffer_subtract\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB, \fR\fBunsigned\ int\ n\fR\fB);\fR +.HP 24 +\fBvoid\ \fBlwres_buffer_clear\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB);\fR +.HP 24 +\fBvoid\ \fBlwres_buffer_first\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB);\fR +.HP 26 +\fBvoid\ \fBlwres_buffer_forward\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB, \fR\fBunsigned\ int\ n\fR\fB);\fR +.HP 23 +\fBvoid\ \fBlwres_buffer_back\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB, \fR\fBunsigned\ int\ n\fR\fB);\fR +.HP 36 +\fBlwres_uint8_t\ \fBlwres_buffer_getuint8\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB);\fR +.HP 27 +\fBvoid\ \fBlwres_buffer_putuint8\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB, \fR\fBlwres_uint8_t\ val\fR\fB);\fR +.HP 38 +\fBlwres_uint16_t\ \fBlwres_buffer_getuint16\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB);\fR +.HP 28 +\fBvoid\ \fBlwres_buffer_putuint16\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB, \fR\fBlwres_uint16_t\ val\fR\fB);\fR +.HP 38 +\fBlwres_uint32_t\ \fBlwres_buffer_getuint32\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB);\fR +.HP 28 +\fBvoid\ \fBlwres_buffer_putuint32\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB, \fR\fBlwres_uint32_t\ val\fR\fB);\fR +.HP 25 +\fBvoid\ \fBlwres_buffer_putmem\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB, \fR\fBconst\ unsigned\ char\ *base\fR\fB, \fR\fBunsigned\ int\ length\fR\fB);\fR +.HP 25 +\fBvoid\ \fBlwres_buffer_getmem\fR\fR\fB(\fR\fBlwres_buffer_t\ *b\fR\fB, \fR\fBunsigned\ char\ *base\fR\fB, \fR\fBunsigned\ int\ length\fR\fB);\fR .SH "DESCRIPTION" .PP -These functions provide bounds checked access to a region of memory -where data is being read or written. -They are based on, and similar to, the +These functions provide bounds checked access to a region of memory where data is being read or written. They are based on, and similar to, the isc_buffer_ functions in the ISC library. .PP -A buffer is a region of memory, together with a set of related -subregions. -The \fBused region\fR and the -\fBavailable\fR region are disjoint, and -their union is the buffer's region. -The used region extends from the beginning of the buffer region to the -last used byte. -The available region extends from one byte greater than the last used -byte to the end of the buffer's region. -The size of the used region can be changed using various -buffer commands. -Initially, the used region is empty. +A buffer is a region of memory, together with a set of related subregions. The +\fIused region\fR +and the +\fIavailable\fR +region are disjoint, and their union is the buffer's region. The used region extends from the beginning of the buffer region to the last used byte. The available region extends from one byte greater than the last used byte to the end of the buffer's region. The size of the used region can be changed using various buffer commands. Initially, the used region is empty. .PP The used region is further subdivided into two disjoint regions: the -\fBconsumed region\fR and the \fBremaining region\fR. -The union of these two regions is the used region. -The consumed region extends from the beginning of the used region to -the byte before the \fBcurrent\fR offset (if any). -The \fBremaining\fR region the current pointer to the end of the used -region. -The size of the consumed region can be changed using various -buffer commands. -Initially, the consumed region is empty. +\fIconsumed region\fR +and the +\fIremaining region\fR. The union of these two regions is the used region. The consumed region extends from the beginning of the used region to the byte before the +\fIcurrent\fR +offset (if any). The +\fIremaining\fR +region the current pointer to the end of the used region. The size of the consumed region can be changed using various buffer commands. Initially, the consumed region is empty. .PP -The \fBactive region\fR is an (optional) subregion of the remaining -region. -It extends from the current offset to an offset in the -remaining region. -Initially, the active region is empty. -If the current offset advances beyond the chosen offset, -the active region will also be empty. +The +\fIactive region\fR +is an (optional) subregion of the remaining region. It extends from the current offset to an offset in the remaining region. Initially, the active region is empty. If the current offset advances beyond the chosen offset, the active region will also be empty. .PP -.sp .nf - - /------------entire length---------------\\\\ - /----- used region -----\\\\/-- available --\\\\ - +----------------------------------------+ + /\-\-\-\-\-\-\-\-\-\-\-\-entire length\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\\\\ + /\-\-\-\-\- used region \-\-\-\-\-\\\\/\-\- available \-\-\\\\ + +\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+ | consumed | remaining | | - +----------------------------------------+ + +\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+ a b c d e - a == base of buffer. b == current pointer. Can be anywhere between a and d. c == active pointer. Meaningful between b and d. d == used pointer. e == length of buffer. - - a-e == entire length of buffer. - a-d == used region. - a-b == consumed region. - b-d == remaining region. - b-c == optional active region. -.sp + a\-e == entire length of buffer. + a\-d == used region. + a\-b == consumed region. + b\-d == remaining region. + b\-c == optional active region. .fi +.sp .PP \fBlwres_buffer_init()\fR initializes the -\fBlwres_buffer_t\fR -\fI*b\fR +\fBlwres_buffer_t\fR\fI*b\fR and assocates it with the memory region of size \fIlength\fR bytes starting at location @@ -177,15 +120,13 @@ bytes starting at location \fBlwres_buffer_invalidate()\fR marks the buffer \fI*b\fR -as invalid. Invalidating a buffer after use is not required, -but makes it possible to catch its possible accidental use. +as invalid. Invalidating a buffer after use is not required, but makes it possible to catch its possible accidental use. .PP The functions \fBlwres_buffer_add()\fR and \fBlwres_buffer_subtract()\fR -respectively increase and decrease the used space in -buffer +respectively increase and decrease the used space in buffer \fI*b\fR by \fIn\fR @@ -193,25 +134,23 @@ bytes. \fBlwres_buffer_add()\fR checks for buffer overflow and \fBlwres_buffer_subtract()\fR -checks for underflow. -These functions do not allocate or deallocate memory. -They just change the value of -\fBused\fR. +checks for underflow. These functions do not allocate or deallocate memory. They just change the value of +used. .PP -A buffer is re-initialised by -\fBlwres_buffer_clear()\fR. -The function sets -\fBused\fR , -\fBcurrent\fR +A buffer is re\-initialised by +\fBlwres_buffer_clear()\fR. The function sets +used +, +current and -\fBactive\fR +active to zero. .PP \fBlwres_buffer_first\fR makes the consumed region of buffer \fI*p\fR empty by setting -\fBcurrent\fR +current to zero (the start of the buffer). .PP \fBlwres_buffer_forward()\fR @@ -219,21 +158,19 @@ increases the consumed region of buffer \fI*b\fR by \fIn\fR -bytes, checking for overflow. -Similarly, +bytes, checking for overflow. Similarly, \fBlwres_buffer_back()\fR decreases buffer -\fIb\fR's -consumed region by +\fIb\fR's consumed region by \fIn\fR bytes and checks for underflow. .PP \fBlwres_buffer_getuint8()\fR -reads an unsigned 8-bit integer from +reads an unsigned 8\-bit integer from \fI*b\fR and returns it. \fBlwres_buffer_putuint8()\fR -writes the unsigned 8-bit integer +writes the unsigned 8\-bit integer \fIval\fR to buffer \fI*b\fR. @@ -243,21 +180,17 @@ and \fBlwres_buffer_getuint32()\fR are identical to \fBlwres_buffer_putuint8()\fR -except that they respectively read an unsigned 16-bit or 32-bit integer -in network byte order from -\fIb\fR. -Similarly, +except that they respectively read an unsigned 16\-bit or 32\-bit integer in network byte order from +\fIb\fR. Similarly, \fBlwres_buffer_putuint16()\fR and \fBlwres_buffer_putuint32()\fR -writes the unsigned 16-bit or 32-bit integer +writes the unsigned 16\-bit or 32\-bit integer \fIval\fR to buffer -\fIb\fR, -in network byte order. +\fIb\fR, in network byte order. .PP -Arbitrary amounts of data are read or written from a lightweight -resolver buffer with +Arbitrary amounts of data are read or written from a lightweight resolver buffer with \fBlwres_buffer_getmem()\fR and \fBlwres_buffer_putmem()\fR @@ -268,8 +201,7 @@ copies bytes of memory at \fIbase\fR to -\fIb\fR. -Conversely, +\fIb\fR. Conversely, \fBlwres_buffer_getmem()\fR copies \fIlength\fR |