.\"
.\" Copyright (c) 2009 - 2016 Natacha Porté <natacha@instinctive.eu>
.\"
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.Dd September 12, 2016
.Dt SOLDOUT_BUFFER 3
.Os
.Sh NAME
.Nm soldout_buffer ,
.Nm bufcasecmp ,
.Nm bufcmp ,
.Nm bufcmps ,
.Nm bufdup ,
.Nm bufgrow ,
.Nm bufnew ,
.Nm bufnullterm ,
.Nm bufprintf ,
.Nm bufput ,
.Nm bufputs ,
.Nm bufputc ,
.Nm bufrelease ,
.Nm bufreset ,
.Nm bufset ,
.Nm bufslurp ,
.Nm buftoi ,
.Nm vbufprintf
.Nd buffer handling functions for soldout
.Sh SYNOPSIS
.In buffer.h
.Pp
.Fd "#define CONST_BUF(name, string)"
.Fd "#define VOLATILE_BUF(name, strname)"
.Fd "#define BUFPUTSL(output, literal)"
.Ft int
.Fo bufcasecmp
.Fa "const struct buf *a"
.Fa "const struct buf *b"
.Fc
.Ft int
.Fo bufcmp
.Fa "const struct buf *a"
.Fa "const struct buf *b"
.Fc
.Ft int
.Fo bufcmps
.Fa "const struct buf *a"
.Fa "const char *b"
.Fc
.Ft "struct buf *"
.Fo bufdup
.Fa "const struct buf *src"
.Fa "size_t dupunit"
.Fc
.Ft int
.Fo bufgrow
.Fa "struct buf *buf"
.Fa "size_t sz"
.Fc
.Ft "struct buf *"
.Fo bufnew
.Fa "size_t unit"
.Fc
.Ft void
.Fo bufnullterm
.Fa "struct buf *buf"
.Fc
.Ft void
.Fo bufprintf
.Fa "struct buf *buf"
.Fa "const char *fmt"
.Fa ...
.Fc
.Ft void
.Fo bufput
.Fa "struct buf *buf"
.Fa "const void *data"
.Fa "size_t len"
.Fc
.Ft void
.Fo bufputs
.Fa "struct buf *buf"
.Fa "const char *str"
.Fc
.Ft void
.Fo bufputc
.Fa "struct buf *buf"
.Fa "char c"
.Fc
.Ft void
.Fo bufrelease
.Fa "struct buf *buf"
.Fc
.Ft void
.Fo bufreset
.Fa "struct buf *buf"
.Fc
.Ft void
.Fo bufset
.Fa "struct buf **dest"
.Fa "struct buf *src"
.Fc
.Ft void
.Fo bufslurp
.Fa "struct buf *buf"
.Fa "size_t len"
.Fc
.Ft int
.Fo buftoi
.Fa "struct buf *buf"
.Fa "size_t offset_i"
.Fa "size_t *offset_o"
.Fc
.Ft void
.Fo vbufprintf
.Fa "struct buf *buf"
.Fa "const char *fmt"
.Fa "va_list ap"
.Fc
.Vt extern long buffer_stat_nb;
.Vt extern size_t buffer_stat_alloc_bytes;
.Sh DESCRIPTION
.Ss Variables
Compile time options.
Statistics are kept about memory usage.
.Bl -ohang
.It Va buffer_stat_nb
show how many buffers were created.
.It Va buffer_stat_alloc_bytes
show how many bytes were allocated.
.El
.Ss Types
.Bl -ohang
.It Vt "struct buf"
character array buffer.
Has this form:
.Bd -literal -offset indent
struct buf {
	char	*data;	/* actual character data */
	size_t	 size;	/* size of the string */
	size_t	 asize;	/* allocated size (0 = volatile buffer) */
	size_t	 unit;	/* reallocation unit size (0 = read-only buffer) */
	int	 ref;	/* reference count */
};
.Ed
.El
.Ss Macros
.Bl -ohang
.It Dv CONST_BUF
create a global buffer
.Va name
from a string literal
.Va string .
.It Dv VOLATILE_BUF
create a volatile buffer
.Va name
on the stack from a string
.Va strname .
.It Dv BUFPUTSL
optimized
.Fn bufputs
of a string literal.
.El
.Ss Functions
.Bl -ohang
.It Fn bufcasecmp
compare two buffers ignoring case.
.It Fn bufcmp
compare two buffers.
.It Fn bufcmps
compare a buffer to a string.
.It Fn bufdup
duplicate a buffer
.Va src .
.It Fn bufgrow
increase the allocated size to the size
.Va sz .
.It Fn bufnew
create a new buffer.
.It Fn bufnullterm
terminate the string array by NUL
.Pq making a C-string .
.It Fn bufprintf
print formatted output to a buffer
.Va buf .
.It Fn bufput
append raw data to a buffer
.Va buf .
.It Fn bufputs
append a NUL-terminated string
.Va str
to a buffer
.Va buf .
.It Fn bufputc
append a single char
.Va c
to a buffer
.Va buf .
.It Fn bufrelease
decrease the reference count and free the buffer
.Va buf
if needed.
.It Fn bufreset
free internal data of the buffer
.Va buf .
.It Fn bufset
safely assign a buffer to another.
.It Fn bufslurp
remove a given number of bytes from the head of the array.
.It Fn buftoi
convert the numbers at the beginning of the buffer
.Va buf
into an
.Vt int .
.It Fn vbufprintf
.Xr stdarg 3
variant of formatted printing into a buffer
.Va buf .
.El
.Sh RETURN VALUES
The
.Fn bufcasecmp ,
.Fn bufcmp
and
.Fn bufcmps
functions return an integer less than, equal to, or greater than zero if
.Va a
is found, respectively, to be less than, to match, or be greater than
.Va b .
.Pp
The
.Fn bufdup
and
.Fn bufnew
functions return a
.Vt "struct buf *"
on success; on error they return
.Dv NULL .
.Pp
The
.Fn bufgrow
function returns on success 1; on error - 0.
.Pp
The
.Fn buftoi
function return the converted value.
.Sh SEE ALSO
.Xr soldout_markdown 3 ,
.Xr stdarg 3
.Sh AUTHORS
.An -nosplit
The
.Nm soldout
library
was written by
.An Natasha Qo Kerensikova Qc Porte Aq Mt natacha@instinctive.eu .
Manual page was originally written by
.An Massimo Manghi Aq Mt mxmanghi@apache.org ,
and rewritten to mdoc format by
.An Svyatoslav Mishyn Aq Mt juef@openmailbox.org .