linebuf_prev

SFL
Version 2.11

`linebuf_prev`

#include "sfllbuf.h"
char *
linebuf_prev (LINEBUF *buffer, DESCR *descr, const char *curline)

Synopsis

Fetches the previous line in the buffer, using the pointer that was returned by linebuf last(). Returns NULL if there are no more lines in the buffer, or a pointer for further calls. The line is stored in the supplied descriptor, and is truncated if the descriptor is too small.

Source Code - (sfllbuf.c)

{
    ASSERT (buffer);
    ASSERT (descr);
    ASSERT (curline);

    if (curline == buffer-> tail)
        return (NULL);                  /*  We're at the start               */
    else
      {
        /*  We're pointing to the byte after the line's null byte            */
        buffer_dec (curline);           /*  Bump down to null                */
        ASSERT (*curline == '\0');

        do
          {
            buffer_dec (curline);       /*  And now look for previous null   */
            if (*curline == '\0')
              {
                buffer_inc (curline);   /*  Bump up to start of string       */
                break;
              }
          }
        until (curline == buffer-> tail);

        get_line (buffer, descr, curline);
        return ((char *) curline);
      }
}

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