mirror of
https://github.com/ipxe/ipxe
synced 2026-01-12 00:18:33 +03:00
8406115834
Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain. Work around this problem by renaming project from gPXE to iPXE, and updating URLs to match. Also update README, LOG and COPYRIGHTS to remove obsolete information. Signed-off-by: Michael Brown <mcb30@ipxe.org>
112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/**
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* @file
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*
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* Line buffering
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*
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*/
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <ipxe/linebuf.h>
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/**
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* Retrieve buffered-up line
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*
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* @v linebuf Line buffer
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* @ret line Buffered line, or NULL if no line ready to read
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*/
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char * buffered_line ( struct line_buffer *linebuf ) {
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return ( linebuf->ready ? linebuf->data : NULL );
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}
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/**
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* Discard line buffer contents
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*
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* @v linebuf Line buffer
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*/
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void empty_line_buffer ( struct line_buffer *linebuf ) {
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free ( linebuf->data );
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linebuf->data = NULL;
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linebuf->len = 0;
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linebuf->ready = 0;
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}
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/**
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* Buffer up received data by lines
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*
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* @v linebuf Line buffer
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* @v data New data to add
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* @v len Length of new data to add
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* @ret len Consumed length, or negative error number
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*
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* After calling line_buffer(), use buffered_line() to determine
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* whether or not a complete line is available. Carriage returns and
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* newlines will have been stripped, and the line will be
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* NUL-terminated. This buffered line is valid only until the next
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* call to line_buffer() (or to empty_line_buffer()).
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*
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* Note that line buffers use dynamically allocated storage; you
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* should call empty_line_buffer() before freeing a @c struct @c
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* line_buffer.
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*/
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ssize_t line_buffer ( struct line_buffer *linebuf,
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const char *data, size_t len ) {
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const char *eol;
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size_t consume;
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size_t new_len;
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char *new_data;
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/* Free any completed line from previous iteration */
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if ( linebuf->ready )
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empty_line_buffer ( linebuf );
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/* Search for line terminator */
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if ( ( eol = memchr ( data, '\n', len ) ) ) {
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consume = ( eol - data + 1 );
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} else {
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consume = len;
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}
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/* Reallocate data buffer and copy in new data */
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new_len = ( linebuf->len + consume );
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new_data = realloc ( linebuf->data, ( new_len + 1 ) );
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if ( ! new_data )
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return -ENOMEM;
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memcpy ( ( new_data + linebuf->len ), data, consume );
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new_data[new_len] = '\0';
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linebuf->data = new_data;
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linebuf->len = new_len;
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/* If we have reached end of line, trim the line and mark as ready */
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if ( eol ) {
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linebuf->data[--linebuf->len] = '\0'; /* trim NL */
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if ( linebuf->data[linebuf->len - 1] == '\r' )
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linebuf->data[--linebuf->len] = '\0'; /* trim CR */
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linebuf->ready = 1;
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}
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return consume;
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}
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