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libisoburn/test/compare_file.c

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/*
Compare two copies of a file object in as many aspects as i can imagine
to make sense. (E.g.: comparing atime makes no sense.)
To compare tree /media/dvd and /original/dir :
find /media/dvd -exec compare_file '{}' /media/dvd /original/dir ';'
Copyright 2008 - 2015 Thomas Schmitt, <scdbackup@gmx.net>
Provided under GPL version 2 or later.
cc -g -o compare_file compare_file.c
*/
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
#include <ctype.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
/* O_BINARY is needed for Cygwin but undefined elsewhere */
#ifndef O_BINARY
#define O_BINARY 0
#endif
/* @param flag bit0= single letters */
char *Ftypetxt(mode_t st_mode, int flag)
{
if(flag&1)
goto single_letters;
if(S_ISDIR(st_mode))
return("directory");
else if(S_ISREG(st_mode))
return("regular_file");
else if(S_ISLNK(st_mode))
return("symbolic_link");
else if(S_ISBLK(st_mode))
return("block_device");
else if(S_ISCHR(st_mode))
return("char_device");
else if(S_ISFIFO(st_mode))
return("name_pipe");
else if(S_ISSOCK(st_mode))
return("unix_socket");
return("unknown");
single_letters:;
if(S_ISDIR(st_mode))
return("d");
else if(S_ISREG(st_mode))
return("-");
else if(S_ISLNK(st_mode))
return("l");
else if(S_ISBLK(st_mode))
return("b");
else if(S_ISCHR(st_mode))
return("c");
else if(S_ISFIFO(st_mode))
return("p");
else if(S_ISSOCK(st_mode))
return("s");
return("?");
}
char *Ftimetxt(time_t t, char timetext[40], int flag)
{
char *rpt;
struct tm tms, *tmpt;
static char months[12][4]= { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
tmpt= localtime_r(&t, &tms);
rpt= timetext;
rpt[0]= 0;
if(tmpt==0)
sprintf(rpt+strlen(rpt), "%12.f", (double) t);
else if(time(NULL)-t < 180*86400 && time(NULL)-t >= 0)
sprintf(rpt+strlen(rpt), "%3s %2d %2.2d:%2.2d",
months[tms.tm_mon], tms.tm_mday, tms.tm_hour, tms.tm_min);
else
sprintf(rpt+strlen(rpt), "%3s %2d %4.4d",
months[tms.tm_mon], tms.tm_mday, 1900+tms.tm_year);
return(timetext);
}
/* @param flag bit0= compare atime
bit1= compare ctime
*/
int Compare_2_files(char *adr1, char *adr2, char *adrc, int flag)
{
struct stat s1, s2;
int ret, differs= 0, r1, r2, fd1= -1, fd2= -1, i, done;
char buf1[4096], buf2[4096], a[4096], ttx1[40], ttx2[40];
off_t r1count= 0, r2count= 0, diffcount= 0, first_diff= -1;
ret= lstat(adr1, &s1);
if(ret==-1) {
printf("? %s : cannot lstat() : %s\n", adr1, strerror(errno));
return(0);
}
strcpy(a, Ftypetxt(s1.st_mode, 1));
strcat(a, " ");
if(adrc[0]) {
if(strlen(a) + strlen(adrc) < 4096)
strcat(a, adrc);
} else {
strcat(a, ".");
}
ret= lstat(adr2, &s2);
if(ret==-1) {
printf("? %s : cannot lstat() : %s\n", adr2, strerror(errno));
return(0);
}
/* Attributes */
if(s1.st_mode != s2.st_mode) {
if((s1.st_mode&~S_IFMT)!=(s2.st_mode&~S_IFMT))
printf("%s : st_mode : %7.7o <> %7.7o\n", a,
(unsigned int) (s1.st_mode & ~S_IFMT),
(unsigned int) (s2.st_mode & ~S_IFMT));
if((s1.st_mode&S_IFMT)!=(s2.st_mode&S_IFMT))
printf("%s : type : %s <> %s\n",
a, Ftypetxt(s1.st_mode, 0), Ftypetxt(s2.st_mode, 0));
differs= 1;
}
if(s1.st_uid != s2.st_uid) {
printf("%s : st_uid : %lu <> %lu\n",
a, (unsigned long) s1.st_uid, (unsigned long) s2.st_uid);
differs= 1;
}
if(s1.st_gid != s2.st_gid) {
printf("%s : st_gid : %lu <> %lu\n",
a, (unsigned long) s1.st_gid, (unsigned long) s2.st_gid);
differs= 1;
}
if((S_ISCHR(s1.st_mode) && S_ISCHR(s2.st_mode)) ||
(S_ISBLK(s1.st_mode) && S_ISBLK(s2.st_mode))) {
if(s1.st_rdev != s2.st_rdev) {
printf("%s : %s st_rdev : %lu <> %lu\n", a,
(S_ISCHR(s1.st_mode) ? "S_IFCHR" : "S_IFBLK"),
(unsigned long) s1.st_rdev, (unsigned long) s1.st_rdev);
differs= 1;
}
}
if(S_ISREG(s2.st_mode) && s1.st_size != s2.st_size) {
printf("%s : st_size : %.f <> %.f diff= %.f\n",
a, (double) s1.st_size, (double) s2.st_size,
((double) s1.st_size) - (double) s2.st_size);
differs= 1;
}
if(s1.st_mtime != s2.st_mtime) {
printf("%s : st_mtime : %s <> %s diff= %.f s\n",
a, Ftimetxt(s1.st_mtime, ttx1, 0),
Ftimetxt(s2.st_mtime, ttx2, 0),
((double) s1.st_mtime) - (double) s2.st_mtime);
differs= 1;
}
if(flag&1) {
if(s1.st_atime != s2.st_atime) {
printf("%s : st_atime : %s <> %s diff= %.f s\n",
a, Ftimetxt(s1.st_atime, ttx1, 0),
Ftimetxt(s2.st_atime, ttx2, 0),
((double) s1.st_atime) - (double) s2.st_atime);
differs= 1;
}
}
if(flag&2) {
if(s1.st_ctime != s2.st_ctime) {
printf("%s : st_ctime : %s <> %s diff= %.f s\n",
a, Ftimetxt(s1.st_ctime, ttx1, 0),
Ftimetxt(s2.st_ctime, ttx2, 0),
((double) s1.st_ctime) - (double) s2.st_ctime);
differs= 1;
}
}
if(S_ISREG(s1.st_mode) && S_ISREG(s2.st_mode)) {
fd1= open(adr1, O_RDONLY | O_BINARY);
if(fd1==-1) {
printf("- %s : cannot open() : %s\n", adr1, strerror(errno));
return(0);
}
fd2= open(adr2, O_RDONLY | O_BINARY);
if(fd2==-1) {
printf("- %s : cannot open() : %s\n", adr2, strerror(errno));
close(fd1);
return(0);
}
/* Content */
done= 0;
while(!done) {
r1= read(fd1, buf1, sizeof(buf1));
r2= read(fd2, buf2, sizeof(buf2));
if((r1==EOF && r2==EOF) || (r1==0 && r2==0))
break;
if(r1==EOF || r1==0) {
if(r1==EOF)
r1= 0;
if(s1.st_size > r1count + r1)
printf("- %s : early EOF after %.f bytes\n", adr1, (double) r1count);
differs= 1;
}
r1count+= r1;
if(r2==EOF || r2<r1) {
if(r2==EOF)
r2= 0;
if(s2.st_size > r2count + r2)
printf("- %s : early EOF after %.f bytes\n", adr2, (double) r2count);
differs= 1;
done= 1;
}
if(r2>r1) {
if(s1.st_size > r1count + r1)
printf("- %s : early EOF after %.f bytes\n", adr1, (double) r1count);
differs= 1;
done= 1;
}
r2count+= r2;
if(r1>r2)
r1= r2;
for(i= 0; i<r1; i++) {
if(buf1[i]!=buf2[i]) {
if(first_diff<0)
first_diff= i;
diffcount++;
}
}
}
if(diffcount>0 || r1count!=r2count) {
if(first_diff<0)
first_diff= (r1count>r2count ? r2count : r1count);
printf("%s : %s : differs by at least %.f bytes. First at %.f\n", a,
(s1.st_mtime==s2.st_mtime ? "CONTENT":"content"),
(double) (diffcount + abs(r1count-r2count)), (double) first_diff);
differs= 1;
}
}
if(fd1!=-1)
close(fd1);
if(fd2!=-1)
close(fd2);
return(!differs);
}
int main(int argc, char **argv)
{
int ret, i, with_ctime= 1;
char adr1[4096], adr2[4096], adrc[4096];
if(sizeof(off_t) < 8) {
fprintf(stderr,
"%s : FATAL : Compile time misconfiguration. sizeof(off_t) too small.\n\n",
argv[0]);
exit(4);
}
if(argc<4) {
fprintf(stderr, "usage: %s path prefix1 prefix2\n", argv[0]);
exit(2);
}
for(i= 4; i<argc; i++) {
if(strcmp(argv[i], "-no_ctime")==0)
with_ctime= 0;
else {
fprintf(stderr, "%s : Option not recognized: '%s'\n", argv[0], argv[i]);
exit(2);
}
}
if(strncmp(argv[1], argv[2], strlen(argv[2]))!=0) {
fprintf(stderr, "%s: path '%s' does not match prefix1 '%s'\n",
argv[0], argv[1], argv[2]);
exit(2);
}
if(strlen(argv[1]) >= 4096) {
fprintf(stderr, "path exceeds size limit of 4095\n");
exit(3);
}
if(strlen(argv[1]) - strlen(argv[2]) > 4000) {
fprintf(stderr, "common address part exceeds size limit of 4000\n");
exit(3);
}
if(strlen(argv[3]) + 1 + strlen(argv[1]) - strlen(argv[2]) >= 4096) {
fprintf(stderr, "prefix2 exceeds size limit of 4095\n");
exit(3);
}
strcpy(adr1, argv[1]);
strcpy(adrc, argv[1]+strlen(argv[2]));
sprintf(adr2, "%s%s%s",
argv[3], (adrc[0]=='/' || adrc[0]==0 ? "" : "/"), adrc);
ret= Compare_2_files(adr1, adr2, adrc, (with_ctime<<1));
exit(ret<=0);
}
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