plugins/valgrind/parser.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2 /*
   3  *  Authors: Jeffrey Stedfast <fejj@ximian.com>
   4  *
   5  *  Copyright 2003 Ximian, Inc. (www.ximian.com)
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  *
  21  */
  22
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <glib.h>
  29
  30 #include <stdio.h>
  31 #include <string.h>
  32 #include <sys/types.h>
  33 #include <unistd.h>
  34 #include <fcntl.h>
  35 #include <errno.h>
  36
  37 #include "parser.h"
  38 #include "vgio.h"
  39
  40
  41 void
  42 parser_init (Parser *parser, int fd)
  43 {
  44         parser->inbuf = parser->realbuf + PARSER_SCAN_HEAD;
  45         parser->inptr = parser->inbuf;
  46         parser->inend = parser->inbuf;
  47
  48         parser->fd = fd;
  49 }
  50
  51
  52 ssize_t
  53 parser_fill (Parser *parser)
  54 {
  55         unsigned char *inbuf, *inptr, *inend;
  56         ssize_t nread;
  57         size_t inlen;
  58
  59         inbuf = parser->inbuf;
  60         inptr = parser->inptr;
  61         inend = parser->inend;
  62         inlen = inend - inptr;
  63
  64         g_assert (inptr <= inend);
  65
  66         /* attempt to align 'inend' with realbuf + PARSER_SCAN_HEAD */
  67         if (inptr >= inbuf) {
  68                 inbuf -= inlen < PARSER_SCAN_HEAD ? inlen : PARSER_SCAN_HEAD;
  69                 memmove (inbuf, inptr, inlen);
  70                 inptr = inbuf;
  71                 inbuf += inlen;
  72         } else if (inptr > parser->realbuf) {
  73                 size_t shift;
  74
  75                 shift = MIN (inptr - parser->realbuf, inend - inbuf);
  76                 memmove (inptr - shift, inptr, inlen);
  77                 inptr -= shift;
  78                 inbuf = inptr + inlen;
  79         } else {
  80                 /* we can't shift... */
  81                 inbuf = inend;
  82         }
  83
  84         parser->inptr = inptr;
  85         parser->inend = inbuf;
  86         inend = parser->realbuf + PARSER_SCAN_HEAD + PARSER_SCAN_BUF - 1;
  87
  88         if ((nread = vg_read (parser->fd, (char *)inbuf, inend - inbuf)) == -1)
  89                 return -1;
  90
  91         parser->inend += nread;
  92
  93         return parser->inend - parser->inptr;
  94 }