dockapps/wmweather+/diff.c
2014-10-05 19:18:49 +01:00

63 lines
2 KiB
C

#include "config.h"
/* Copyright (C) 2002 Brad Jorsch <anomie@users.sourceforge.net>
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "wmweather+.h"
int diff(char *file1, char *file2){
FILE *fp1, *fp2;
size_t len1, len2;
struct stat statbuf;
int ret;
int len=BIGBUF_LEN/2;
char *s1=(char *)bigbuf, *s2=(char *)(bigbuf+len);
if((fp1=fopen(file1, "r"))==NULL) return -1;
if((fp2=fopen(file2, "r"))==NULL){ fclose(fp1); return -1; }
if(fstat(fileno(fp1), &statbuf)<0 || !S_ISREG(statbuf.st_mode)){
fclose(fp1);
fclose(fp2);
return -1;
}
len1=statbuf.st_size;
if(fstat(fileno(fp2), &statbuf)<0 || !S_ISREG(statbuf.st_mode)){
fclose(fp1);
fclose(fp2);
return -1;
}
len2=statbuf.st_size;
if(len1!=len2){ fclose(fp1); fclose(fp2); return 1; }
if(len1==0){ fclose(fp1); fclose(fp2); return 0; }
while(!feof(fp1) && !feof(fp2)){
len1=fread(s1, sizeof(char), len, fp1);
len2=fread(s2, sizeof(char), len, fp2);
if(len1!=len2 || memcmp(s1, s2, len1)){
fclose(fp1); fclose(fp2); return 1;
}
}
ret=(!feof(fp1) || !feof(fp2));
fclose(fp1);
fclose(fp2);
return ret;
}