/* 
   Copyright (C) Andrew Tridgell 1996
   Copyright (C) Paul Mackerras 1996
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* a lot of this stuff was originally derived from GNU tar, although
   it has now changed so much that it is hard to tell :) */

#include "rsync.h"

extern int verbose;

static struct exclude_struct **exclude_list;

/* build an exclude structure given a exclude pattern */
static struct exclude_struct *make_exclude(char *pattern, int include)
{
	struct exclude_struct *ret;

	ret = (struct exclude_struct *)malloc(sizeof(*ret));
	if (!ret) out_of_memory("make_exclude");

	memset(ret, 0, sizeof(*ret));

	ret->orig = strdup(pattern);

	if (strncmp(pattern,"- ",2) == 0) {
		pattern += 2;
	} else if (strncmp(pattern,"+ ",2) == 0) {
		ret->include = 1;
		pattern += 2;
	} else {
		ret->include = include;
	}

	ret->pattern = strdup(pattern);

	if (!ret->orig || !ret->pattern) out_of_memory("make_exclude");

	if (strpbrk(pattern, "*[?")) ret->regular_exp = 1;

	if (strlen(pattern) > 1 && pattern[strlen(pattern)-1] == '/') {
		ret->pattern[strlen(pattern)-1] = 0;
		ret->directory = 1;
	}

	if (!strchr(ret->pattern,'/')) {
		ret->local = 1;
	}

	return ret;
}

static void free_exclude(struct exclude_struct *ex)
{
	free(ex->orig);
	free(ex->pattern);
	memset(ex,0,sizeof(*ex));
	free(ex);
}

static int check_one_exclude(char *name,struct exclude_struct *ex,
			     STRUCT_STAT *st)
{
	char *p;
	int match_start=0;
	char *pattern = ex->pattern;

	if (ex->local && (p=strrchr(name,'/')))
		name = p+1;

	if (!name[0]) return 0;

	if (ex->directory && !S_ISDIR(st->st_mode)) return 0;

	if (*pattern == '/' && *name != '/') {
		match_start = 1;
		pattern++;
	}

	if (ex->regular_exp) {
		if (fnmatch(pattern, name, 0) == 0)
			return 1;
	} else {
		int l1 = strlen(name);
		int l2 = strlen(pattern);
		if (l2 <= l1 && 
		    strcmp(name+(l1-l2),pattern) == 0 &&
		    (l1==l2 || (!match_start && name[l1-(l2+1)] == '/')))
			return 1;
	}

	return 0;
}


int check_exclude(char *name,struct exclude_struct **local_exclude_list,
		  STRUCT_STAT *st)
{
	int n;

	if (exclude_list) {
		for (n=0; exclude_list[n]; n++)
			if (check_one_exclude(name,exclude_list[n],st))
				return !exclude_list[n]->include;
	}

	if (local_exclude_list) {
		for (n=0; local_exclude_list[n]; n++)
			if (check_one_exclude(name,local_exclude_list[n],st))
				return !local_exclude_list[n]->include;
	}

	return 0;
}


void add_exclude_list(char *pattern,struct exclude_struct ***list, int include)
{
	int len=0;
	if (list && *list)
		for (; (*list)[len]; len++) ;

	if (strcmp(pattern,"!") == 0) {
		if (verbose > 2)
			rprintf(FINFO,"clearing exclude list\n");
		while ((len)--) {
			free_exclude((*list)[len]);
		}
		free((*list));
		*list = NULL;
		return;
	}

	*list = (struct exclude_struct **)Realloc(*list,sizeof(struct exclude_struct *)*(len+2));
	
	if (!*list || !((*list)[len] = make_exclude(pattern, include)))
		out_of_memory("add_exclude");
	
	if (verbose > 2)
		rprintf(FINFO,"add_exclude(%s)\n",pattern);
	
	(*list)[len+1] = NULL;
}

void add_exclude(char *pattern, int include)
{
	add_exclude_list(pattern,&exclude_list, include);
}

struct exclude_struct **make_exclude_list(char *fname,
					  struct exclude_struct **list1,
					  int fatal, int include)
{
	struct exclude_struct **list=list1;
	FILE *f = fopen(fname,"r");
	char line[MAXPATHLEN];
	if (!f) {
		if (fatal) {
			rprintf(FERROR,"%s : %s\n",fname,strerror(errno));
			exit_cleanup(1);
		}
		return list;
	}

	while (fgets(line,MAXPATHLEN,f)) {
		int l = strlen(line);
		if (l && line[l-1] == '\n') l--;
		line[l] = 0;
		if (line[0]) add_exclude_list(line,&list,include);
	}
	fclose(f);
	return list;
}


void add_exclude_file(char *fname,int fatal,int include)
{
	if (!fname || !*fname) return;

	exclude_list = make_exclude_list(fname,exclude_list,fatal,include);
}


void send_exclude_list(int f)
{
	int i;
	extern int remote_version;

	if (!exclude_list) {
		write_int(f,0);
		return;
	}

	for (i=0;exclude_list[i];i++) {
		char *pattern = exclude_list[i]->orig; 
		int l;

		if (remote_version < 19) {
			if (strncmp(pattern,"+ ", 2)==0) {
				rprintf(FERROR,"remote rsync does not support include syntax - aborting\n");
				exit_cleanup(1);
			}
			
			if (strncmp(pattern,"- ", 2) == 0) {
				pattern += 2;
			}
		}
		
		l = strlen(pattern);
		if (l == 0) continue;
		write_int(f,l);
		write_buf(f,pattern,l);
	}    

	write_int(f,0);
}


void recv_exclude_list(int f)
{
	char line[MAXPATHLEN];
	int l;
	while ((l=read_int(f))) {
		if (l >= MAXPATHLEN) overflow("recv_exclude_list");
		read_sbuf(f,line,l);
		add_exclude(line,0);
	}
}


void add_exclude_line(char *p)
{
	char *tok;
	if (!p || !*p) return;
	p = strdup(p);
	if (!p) out_of_memory("add_exclude_line");
	for (tok=strtok(p," "); tok; tok=strtok(NULL," "))
		add_exclude(tok, 0);
	free(p);
}


static char *cvs_ignore_list[] = {
  "RCS","SCCS","CVS","CVS.adm","RCSLOG","cvslog.*",
  "tags","TAGS",".make.state",".nse_depinfo",
  "*~", "#*", ".#*", ",*", "*.old", "*.bak", "*.BAK", "*.orig",
  "*.rej", ".del-*", "*.a", "*.o", "*.obj", "*.so", "*.Z", "*.elc", "*.ln",
  "core",NULL};



void add_cvs_excludes(void)
{
	char fname[MAXPATHLEN];
	char *p;
	int i;
  
	for (i=0; cvs_ignore_list[i]; i++)
		add_exclude(cvs_ignore_list[i], 0);

	if ((p=getenv("HOME")) && strlen(p) < (MAXPATHLEN-12)) {
		slprintf(fname,sizeof(fname)-1, "%s/.cvsignore",p);
		add_exclude_file(fname,0,0);
	}

	add_exclude_line(getenv("CVSIGNORE"));
}