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/**********************************************************
* cvs_files.c
*
* Copyright 2004, Stefan Siegl <ssiegl@gmx.de>, Germany
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Publice License,
* version 2 or any later. The license is contained in the COPYING
* file that comes with the cvsfs4hurd distribution.
*
* download arbitrary revisions from cvs host and cache them locally
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#define PACKAGE "cvsfs"
#define VERSION "0.1"
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
#include "cvsfs.h"
#include "cvs_files.h"
#include "cvs_connect.h"
/* cvs_files_cache
*
* Download the revision (as specified by rev) of the specified file.
*/
error_t
cvs_files_cache(struct netnode *file, struct revision *rev)
{
FILE *send, *recv;
char *content = NULL;
unsigned int content_len = 0;
unsigned int content_alloc = 0;
unsigned short int got_something = 0;
char buf[4096]; /* 4k should be enough for most cvs repositories, if
* cvsfs tell's you to increase this value, please do so.
*
* TODO in the far future we may have a fgets-thingy, that
* allocates it's memory dynamically, which occurs to be
* a goodthing(TM) ...
*/
if(cvs_connect(&send, &recv))
return EIO;
/* write out request header */
fprintf(send,
"UseUnchanged\n"
"Argument -r\nArgument 0\n"
"Argument -r\nArgument %s\n"
"Argument ",
rev->id);
/* now write out the path to our file, recurse up to the root-node and
* start writing out each directory's name
*/
void cvs_files_print_path_recursively(FILE *cvs_handle, struct netnode *dir)
{
if(dir->parent)
cvs_files_print_path_recursively(cvs_handle, dir->parent);
fprintf(cvs_handle, "%s/", dir->name);
}
cvs_files_print_path_recursively(send, file->parent);
/* last but not least write out the filename */
fprintf(send, "%s\n", file->name);
/* we need an rdiff ... */
fprintf(send, "rdiff\n");
/* okay, now read the server's response, which either is a diff, having
* a "M" char in front of each line, or an E, error couple.
*/
while(fgets(buf, sizeof(buf), recv))
{
char *ptr;
int buflen = strlen(buf);
ptr = buf + buflen;
ptr --;
if(*ptr != 10)
{
fprintf(stderr, PACKAGE "cvs_files_cache's parse buffer is "
"too small, stopping for the moment.\n");
exit(10);
}
/* chop the linefeed off the end */
*ptr = 0;
if(! strncmp(buf, "ok", 2))
{
cvs_connection_release(send, recv);
if(! got_something)
return ENOENT; /* no content, sorry. */
content = realloc(content, content_len + 1);
if(! content)
return ENOMEM;
content[content_len] = 0; /* zero terminate */
rev->contents = content;
return 0; /* jippie, looks perfectly, he? */
}
if(! strncmp(buf, "error", 5))
{
cvs_connection_release(send, recv);
free(content);
return EIO;
}
if(buf[1] != ' ')
{
cvs_treat_error(recv, buf);
cvs_connection_release(send, recv);
free(content);
return EIO; /* hm, doesn't look got for us ... */
}
switch(buf[0])
{
case 'E': /* we expect a patch, padded by M's, this is not what
* we want to have, keep on complaining
*/
cvs_treat_error(recv, buf);
cvs_connection_release(send, recv);
free(content);
return EIO;
case 'M':
got_something = 1;
if(buf[2] != '+')
continue; /* skip patch's header, we don't need it ... */
while(content_len + buflen - 4 > content_alloc)
{
content_alloc = content_alloc ? content_alloc << 2 : 4096;
content = realloc(content, content_alloc);
if(! content)
return ENOMEM; /* doesn't look too good for us :( */
}
memcpy(content + content_len, buf + 4, buflen - 5);
content_len += buflen - 5;
content[content_len ++] = 10; /* linefeed */
break;
default:
cvs_treat_error(recv, buf);
cvs_connection_release(send, recv);
free(content);
return EIO;
}
}
/* well, got EOF, that shouldn't ever happen ... */
cvs_connection_kill(send, recv);
free(content);
return EIO;
}
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