.TH buffer_init 3
.SH NAME
buffer_init \- initialize buffer structure
.SH SYNTAX
.B #include <libowfat/buffer.h>

void \fBbuffer_init\fR(buffer &\fIb\fR,
                ssize_t (*\fIop\fR)(int,char*,size_t),
                int \fIfd\fR, char* \fIy\fR, size_t \fIylen\fR);
.SH DESCRIPTION
buffer_init prepares \fIb\fR to store a string in \fIy\fR[0], \fIy\fR[1], ...,
\fIy\fR[\fIylen\fR-1].  Initially the string is empty.

buffer_init also prepares \fIb\fR to use the read/write operation specified by
\fIop\fR and \fIfd\fR.

You can use

  buffer \fIb\fR = BUFFER_INIT(\fIop\fR,\fIfd\fR,\fIy\fR,\fIylen\fR);

to initialize \fIb\fR statically if \fIop\fR, \fIfd\fR, \fIy\fR, and \fIylen\fR
are compile-time constants.

You can call buffer_init again at any time. Note that this discards the
currently buffered string.
.SH EXAMPLE
  #include <libowfat/buffer.h>
  #include <libowfat/open.h>

  char buf[4096];
  int fd=open_read("/etc/services");
  buffer input;

  if (fd>=0) {
    char x;
    buffer_init(&input,read,fd,buf,sizeof buf);
    while (buffer_get(&input,&x,1)==1) {
      buffer_put(buffer_1,&x,1);
      if (x=='\\n') break;
    }
    buffer_flush(buffer_1);
  }

.SH "SEE ALSO"
buffer_flush(3), buffer(3)