wmweather+/diff.c

   1 #include "config.h"
   2
   3 /*  Copyright (C) 2002  Brad Jorsch <anomie@users.sourceforge.net>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18 */
  19
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23 #include <sys/stat.h>
  24
  25 #include "wmweather+.h"
  26
  27 int diff(char *file1, char *file2){
  28     FILE *fp1, *fp2;
  29     size_t len1, len2;
  30     struct stat statbuf;
  31     int ret;
  32     int len=BIGBUF_LEN/2;
  33     char *s1=(char *)bigbuf, *s2=(char *)(bigbuf+len);
  34
  35     if((fp1=fopen(file1, "r"))==NULL) return -1;
  36     if((fp2=fopen(file2, "r"))==NULL){ fclose(fp1); return -1; }
  37     if(fstat(fileno(fp1), &statbuf)<0 || !S_ISREG(statbuf.st_mode)){
  38        fclose(fp1);
  39        fclose(fp2);
  40        return -1;
  41     }
  42     len1=statbuf.st_size;
  43     if(fstat(fileno(fp2), &statbuf)<0 || !S_ISREG(statbuf.st_mode)){
  44        fclose(fp1);
  45        fclose(fp2);
  46        return -1;
  47     }
  48     len2=statbuf.st_size;
  49     if(len1!=len2){ fclose(fp1); fclose(fp2); return 1; }
  50     if(len1==0){ fclose(fp1); fclose(fp2); return 0; }
  51     while(!feof(fp1) && !feof(fp2)){
  52         len1=fread(s1, sizeof(char), len, fp1);
  53         len2=fread(s2, sizeof(char), len, fp2);
  54         if(len1!=len2 || memcmp(s1, s2, len1)){
  55             fclose(fp1); fclose(fp2); return 1;
  56         }
  57     }
  58     ret=(!feof(fp1) || !feof(fp2));
  59     fclose(fp1);
  60     fclose(fp2);
  61     return ret;
  62 }