278 lines
7.3 KiB
C
278 lines
7.3 KiB
C
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/*
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Compare two copies of a file object in as many aspects as i can imagine
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to make sense. (E.g.: comparing atime makes no sense.)
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To compare tree /media/dvd and /original/dir :
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find /media/dvd -exec compare_file '{}' /media/dvd /original/dir ';'
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Copyright 2008 Thomas Schmitt, <scdbackup@gmx.net>
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Provided under GPL version 2.
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cc -g -o compare_file compare_file.c
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*/
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#include <ctype.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <time.h>
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/* @param flag bit0= single letters */
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char *Ftypetxt(mode_t st_mode, int flag)
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{
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if(flag&1)
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goto single_letters;
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if(S_ISDIR(st_mode))
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return("directory");
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else if(S_ISREG(st_mode))
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return("regular_file");
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else if(S_ISLNK(st_mode))
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return("symbolic_link");
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else if(S_ISBLK(st_mode))
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return("block_device");
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else if(S_ISCHR(st_mode))
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return("char_device");
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else if(S_ISFIFO(st_mode))
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return("name_pipe");
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else if(S_ISSOCK(st_mode))
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return("unix_socket");
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return("unknown");
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single_letters:;
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if(S_ISDIR(st_mode))
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return("d");
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else if(S_ISREG(st_mode))
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return("-");
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else if(S_ISLNK(st_mode))
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return("l");
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else if(S_ISBLK(st_mode))
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return("b");
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else if(S_ISCHR(st_mode))
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return("c");
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else if(S_ISFIFO(st_mode))
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return("p");
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else if(S_ISSOCK(st_mode))
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return("s");
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return("?");
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}
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char *Ftimetxt(time_t t, char timetext[40], int flag)
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{
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char *rpt;
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struct tm tms, *tmpt;
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static char months[12][4]= { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
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tmpt= localtime_r(&t, &tms);
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rpt= timetext;
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rpt[0]= 0;
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if(tmpt==0)
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sprintf(rpt+strlen(rpt), "%12.f", (double) t);
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else if(time(NULL)-t < 180*86400 && time(NULL)-t >= 0)
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sprintf(rpt+strlen(rpt), "%3s %2d %2.2d:%2.2d",
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months[tms.tm_mon], tms.tm_mday, tms.tm_hour, tms.tm_min);
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else
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sprintf(rpt+strlen(rpt), "%3s %2d %4.4d",
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months[tms.tm_mon], tms.tm_mday, 1900+tms.tm_year);
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return(timetext);
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}
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/* @param flag bit0= compare atime
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bit1= compare ctime
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*/
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int Compare_2_files(char *adr1, char *adr2, char *adrc, int flag)
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{
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struct stat s1, s2;
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int ret, differs= 0, r1, r2, fd1= -1, fd2= -1, i, done;
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char buf1[4096], buf2[4096], a[4096], ttx1[40], ttx2[40];
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off_t r1count= 0, r2count= 0, diffcount= 0, first_diff= -1;
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ret= lstat(adr1, &s1);
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if(ret==-1) {
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printf("? %s : cannot lstat() : %s\n", adr1, strerror(errno));
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return(0);
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}
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strcpy(a, Ftypetxt(s1.st_mode, 1));
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strcat(a, " ");
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if(adrc[0])
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strcat(a, adrc);
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else
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strcat(a, ".");
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ret= lstat(adr2, &s2);
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if(ret==-1) {
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printf("? %s : cannot lstat() : %s\n", adr2, strerror(errno));
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return(0);
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}
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/* Attributes */
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if(s1.st_mode != s2.st_mode) {
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if((s1.st_mode&~S_IFMT)!=(s2.st_mode&~S_IFMT))
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printf("%s : st_mode : %7.7o <> %7.7o\n", a,
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(unsigned int) (s1.st_mode & ~S_IFMT),
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(unsigned int) (s2.st_mode & ~S_IFMT));
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if((s1.st_mode&S_IFMT)!=(s2.st_mode&S_IFMT))
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printf("%s : type : %s <> %s\n",
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a, Ftypetxt(s1.st_mode, 0), Ftypetxt(s2.st_mode, 0));
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differs= 1;
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}
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if(s1.st_uid != s2.st_uid) {
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printf("%s : st_uid : %d <> %d\n", a, s1.st_uid, s2.st_uid);
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differs= 1;
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}
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if(s1.st_gid != s2.st_gid) {
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printf("%s : st_gid : %d <> %d\n", a, s1.st_gid, s2.st_gid);
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differs= 1;
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}
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if((S_ISCHR(s1.st_mode) && S_ISCHR(s2.st_mode)) ||
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(S_ISBLK(s1.st_mode) && S_ISBLK(s2.st_mode))) {
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if(s1.st_rdev != s2.st_rdev) {
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printf("%s : %s st_rdev : %lu <> %lu\n", a,
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(S_ISCHR(s1.st_mode) ? "S_IFCHR" : "S_IFBLK"),
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(unsigned long) s1.st_rdev, (unsigned long) s1.st_rdev);
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differs= 1;
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}
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}
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if(S_ISREG(s2.st_mode) && s1.st_size != s2.st_size) {
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printf("%s : st_size : %.f <> %.f diff= %.f\n",
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a, (double) s1.st_size, (double) s2.st_size,
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((double) s1.st_size) - (double) s2.st_size);
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differs= 1;
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}
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if(s1.st_mtime != s2.st_mtime) {
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printf("%s : st_mtime : %s <> %s diff= %.f s\n",
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a, Ftimetxt(s1.st_mtime, ttx1, 0),
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Ftimetxt(s2.st_mtime, ttx2, 0),
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((double) s1.st_mtime) - (double) s2.st_mtime);
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differs= 1;
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}
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if(flag&1) {
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if(s1.st_atime != s2.st_atime) {
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printf("%s : st_atime : %s <> %s diff= %.f s\n",
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a, Ftimetxt(s1.st_atime, ttx1, 0),
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Ftimetxt(s2.st_atime, ttx2, 0),
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((double) s1.st_atime) - (double) s2.st_atime);
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differs= 1;
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}
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}
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if(flag&2) {
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if(s1.st_ctime != s2.st_ctime) {
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printf("%s : st_ctime : %s <> %s diff= %.f s\n",
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a, Ftimetxt(s1.st_ctime, ttx1, 0),
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Ftimetxt(s2.st_ctime, ttx2, 0),
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((double) s1.st_ctime) - (double) s2.st_ctime);
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differs= 1;
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}
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}
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if(S_ISREG(s1.st_mode) && S_ISREG(s2.st_mode)) {
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fd1= open(adr1, O_RDONLY);
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if(fd1==-1) {
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printf("- %s : cannot open() : %s\n", adr1, strerror(errno));
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return(0);
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}
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fd2= open(adr2, O_RDONLY);
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if(fd2==-1) {
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printf("- %s : cannot open() : %s\n", adr2, strerror(errno));
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close(fd1);
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return(0);
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}
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/* Content */
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done= 0;
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while(!done) {
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r1= read(fd1, buf1, sizeof(buf1));
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r2= read(fd2, buf2, sizeof(buf2));
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if((r1==EOF && r2==EOF) || (r1==0 && r2==0))
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break;
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if(r1==EOF || r1==0) {
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if(r1==EOF)
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r1= 0;
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if(s1.st_size > r1count + r1)
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printf("- %s : early EOF after %.f bytes\n", adr1, (double) r1count);
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differs= 1;
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}
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r1count+= r1;
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if(r2==EOF || r2<r1) {
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if(r2==EOF)
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r2= 0;
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if(s2.st_size > r2count + r2)
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printf("- %s : early EOF after %.f bytes\n", adr2, (double) r2count);
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differs= 1;
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done= 1;
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}
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if(r2>r1) {
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if(s1.st_size > r1count + r1)
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printf("- %s : early EOF after %.f bytes\n", adr1, (double) r1count);
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differs= 1;
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done= 1;
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}
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r2count+= r2;
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if(r1>r2)
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r1= r2;
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for(i= 0; i<r1; i++) {
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if(buf1[i]!=buf2[i]) {
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if(first_diff<0)
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first_diff= i;
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diffcount++;
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}
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}
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}
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if(diffcount>0 || r1count!=r2count) {
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if(first_diff<0)
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first_diff= (r1count>r2count ? r2count : r1count);
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printf("%s : %s : differs by at least %.f bytes. First at %.f\n", a,
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(s1.st_mtime==s2.st_mtime ? "CONTENT":"content"),
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(double) (diffcount + abs(r1count-r2count)), (double) first_diff);
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differs= 1;
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}
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}
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if(fd1!=-1)
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close(fd1);
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if(fd2!=-1)
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close(fd2);
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return(!differs);
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}
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int main(int argc, char **argv)
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{
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int ret, i, with_ctime= 1;
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char adr1[4096], adr2[4096], adrc[4096];
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if(argc<4) {
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fprintf(stderr, "usage: %s path prefix1 prefix2\n", argv[0]);
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exit(2);
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}
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for(i= 4; i<argc; i++) {
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if(strcmp(argv[i], "-no_ctime")==0)
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with_ctime= 0;
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else {
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fprintf(stderr, "%s : Option not recognized: '%s'\n", argv[0], argv[i]);
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exit(1);
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}
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}
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if(strncmp(argv[1], argv[2], strlen(argv[2]))!=0) {
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fprintf(stderr, "%s: path '%s' does not match prefix1 '%s'\n",
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argv[0], argv[1], argv[2]);
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exit(2);
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}
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strcpy(adr1, argv[1]);
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strcpy(adrc, argv[1]+strlen(argv[2]));
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sprintf(adr2, "%s%s%s",
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argv[3], (adrc[0]=='/' || adrc[0]==0 ? "" : "/"), adrc);
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ret= Compare_2_files(adr1, adr2, adrc, (with_ctime<<1));
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exit(ret<=0);
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}
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