Program which compares two files in different trees. Attributes and content.
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libisoburn/trunk/test/compare_file.c
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172
libisoburn/trunk/test/compare_file.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 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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/* @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, fd2, i;
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char buf1[4096], buf2[4096];
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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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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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printf("%s : st_mode : %7.7o <> %7.7o\n", adrc, s1.st_mode, s2.st_mode);
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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", adrc, 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", adrc, 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", adrc,
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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\n",
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adrc, (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 : %u <> %u\n",
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adrc, (unsigned int) s1.st_mtime, (unsigned int) 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 : %u <> %u\n",
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adrc, (unsigned int) s1.st_atime, (unsigned int) 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 : %u <> %u\n",
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adrc, (unsigned int) s1.st_ctime, (unsigned int) 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)) {
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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(adr1, 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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while(1) {
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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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printf("%s : early EOF after %d bytes\n", adr1, r1count);
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differs= 1;
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break;
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}
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r1count+= r1;
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if(r2==EOF || r2<r1) {
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printf("%s : early EOF after %d bytes\n", adr2, r2count);
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differs= 1;
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break;
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}
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if(r2>r1) {
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printf("%s : early EOF after %d bytes\n", adr1, r1count);
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differs= 1;
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break;
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}
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r2count+= 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) {
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printf("%s : Content differs by %.f bytes. First at %.f\n",
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adr1, (double) diffcount, (double) first_diff);
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differs= 1;
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}
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}
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close(fd1);
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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;
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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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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", argv[3], (adrc[0]=='/' ? "" : "/"), adrc);
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ret= Compare_2_files(adr1, adr2, adrc, 2);
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exit(ret<=0);
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}
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