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Document the changes in subr_sbuf.c rev. 1.2.

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This commit is contained in:
Dag-Erling Smørgrav 2001-01-28 00:18:54 +00:00
parent 4dc1413915
commit e499b74df0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=71722
1 changed files with 42 additions and 15 deletions
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57
share/man/man9/sbuf.9
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@ -25,16 +25,18 @@
.\"
.\" $FreeBSD$
.\"
.Dd December 10, 2000
.Dd January 28, 2001
.Dt sbuf 9
.Os FreeBSD
.Sh NAME
.Nm sbuf_new ,
.Nm sbuf_clear ,
.Nm sbuf_setpos ,
.Nm sbuf_cat ,
.Nm sbuf_cpy ,
.Nm sbuf_printf ,
.Nm sbuf_putc ,
.Nm sbuf_overflowed ,
.Nm sbuf_finish ,
.Nm sbuf_data ,
.Nm sbuf_len ,
@ -43,9 +45,11 @@
.Sh SYNOPSIS
.Fd #include <sys/sbuf.h>
.Ft int
.Fn sbuf_new "struct sbuf *s" "char *buf" "size_t length" "int flags"
.Fn sbuf_new "struct sbuf *s" "char *buf" "int length" "int flags"
.Ft void
.Fn sbuf_clear "struct sbuf *s"
.Ft int
.Fn sbuf_setpos "struct sbuf *s" "size_t pos"
.Fn sbuf_setpos "struct sbuf *s" "int pos"
.Ft int
.Fn sbuf_cat "struct sbuf *s" "char *str"
.Ft int
@ -55,10 +59,12 @@
.Ft int
.Fn sbuf_putc "struct sbuf *s" "int c"
.Ft int
.Fn sbuf_overflowed "struct sbuf *s"
.Ft void
.Fn sbuf_finish "struct sbuf *s"
.Ft char *
.Fn sbuf_data "struct sbuf *s"
.Ft size_t
.Ft int
.Fn sbuf_len "struct sbuf *s"
.Ft void
.Fn sbuf_delete "struct sbuf *s"
@ -102,6 +108,12 @@ it must point to an array of at least
characters.
.Pp
The
.Fn sbuf_clear
function invalidates the contents of the
.Fa sbuf
and resets its position to zero.
.Pp
The
.Fn sbuf_setpos
function sets the
.Fa sbuf Ns 's
@ -129,6 +141,8 @@ This is equivalent to calling
with a fresh
.Fa sbuf
or one which position has been reset to zero with
.Fn sbuf_clear
or
.Fn sbuf_setpos .
.Pp
The
@ -149,6 +163,12 @@ to the
at the current position.
.Pp
The
.Fn sbuf_overflowed
function returns a non-zero value if the
.Fa sbuf
overflowed.
.Pp
The
.Fn sbuf_finish
function null-terminates the
.Fa sbuf
@ -165,8 +185,9 @@ The
.Fn sbuf_data
and
.Fn sbuf_len
functions return the actual string and its length, respectively, and
only work on a finished and non-overflowed
functions return the actual string and its length, respectively;
.Fn sbuf_data
only works on a finished
.Fa sbuf .
.Pp
Finally, the
@ -178,12 +199,14 @@ and frees its storage buffer if it was allocated by
.Sh NOTES
If an operation caused an
.Fa sbuf
to overflow, most subsequent operations (including
.Fn sbuf_finish )
on it will fail until the
.Fa sbuf Ns 's
position is reset to a value between 0 and one less than the size of
its storage buffer using
to overflow, most subsequent operations on it will fail until the
.Fa sbuf
is finished using
.Fn sbuf_finish
or reset using
.Fn sbuf_clear ,
or its position is reset to a value between 0 and one less than the
size of its storage buffer using
.Fn sbuf_setpos ,
or it is reinitialized to a sufficiently short string using
.Fn sbuf_cpy .
@ -200,17 +223,19 @@ was invalid, and zero otherwise.
.Fn sbuf_cat ,
.Fn sbuf_cpy ,
.Fn sbuf_printf ,
.Fn sbuf_putc ,
and
.Fn sbuf_finish
.Fn sbuf_putc
all return \-1 if the buffer overflowed, and zero otherwise.
.Pp
.Fn sbuf_overflowed
returns a non-zero value if the buffer overflowed, and zero otherwise.
.Pp
.Fn sbuf_data
and
.Fn sbuf_len
return
.Dv NULL
and 0, respectively, if the buffer overflowed.
and \-1, respectively, if the buffer overflowed.
.Sh SEE ALSO
.Xr printf 3 ,
.Xr strcat 3 ,
@ -228,6 +253,8 @@ family of functions was designed by
.An Poul-Henning Kamp Aq phk@FreeBSD.org
and implemented by
.An Dag-Erling Co\(:idan Sm\(/orgrav Aq des@FreeBSD.org .
Additional improvements were suggested by
.An Justin T. Gibbs Aq gibbs@FreeBSD.org .
.Pp
This manual page was written by
.An Dag-Erling Co\(:idan Sm\(/orgrav .