133 lines
2.4 KiB
C
133 lines
2.4 KiB
C
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#include <u.h>
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#include <libc.h>
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#include <ctype.h>
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#define BUF 65536
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int sflag = 0;
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int lflag = 0;
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int Lflag = 0;
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static void usage(void);
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char **
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seekoff(int fd, char *name, char **argv)
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{
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vlong o;
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if(*argv){
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if (!isascii(**argv) || !isdigit(**argv))
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usage();
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o = strtoll(*argv++, 0, 0);
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if(seek(fd, o, 0) < 0){
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if(!sflag) fprint(2, "cmp: %s: seek by %lld: %r\n",
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name, o);
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exits("seek");
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}
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}
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return argv;
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}
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void
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main(int argc, char *argv[])
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{
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int n, i;
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uchar *p, *q;
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uchar buf1[BUF], buf2[BUF];
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int f1, f2;
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vlong nc = 1, l = 1;
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char *name1, *name2;
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uchar *b1s, *b1e, *b2s, *b2e;
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ARGBEGIN{
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case 's': sflag = 1; break;
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case 'l': lflag = 1; break;
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case 'L': Lflag = 1; break;
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default: usage();
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}ARGEND
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if(argc < 2 || argc > 4)
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usage();
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if((f1 = open(name1 = *argv++, OREAD)) == -1){
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if(!sflag) perror(name1);
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exits("open");
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}
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if((f2 = open(name2 = *argv++, OREAD)) == -1){
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if(!sflag) perror(name2);
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exits("open");
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}
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argv = seekoff(f1, name1, argv);
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argv = seekoff(f2, name2, argv);
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if(*argv)
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usage();
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b1s = b1e = buf1;
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b2s = b2e = buf2;
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for(;;){
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if(b1s >= b1e){
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if(b1s >= &buf1[BUF])
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b1s = buf1;
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n = read(f1, b1s, &buf1[BUF] - b1s);
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b1e = b1s + n;
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}
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if(b2s >= b2e){
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if(b2s >= &buf2[BUF])
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b2s = buf2;
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n = read(f2, b2s, &buf2[BUF] - b2s);
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b2e = b2s + n;
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}
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n = b2e - b2s;
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if(n > b1e - b1s)
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n = b1e - b1s;
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if(n <= 0)
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break;
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if(memcmp((void *)b1s, (void *)b2s, n) != 0){
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if(sflag)
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exits("differ");
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for(p = b1s, q = b2s, i = 0; i < n; p++, q++, i++) {
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if(*p == '\n')
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l++;
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if(*p != *q){
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if(!lflag){
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print("%s %s differ: char %lld",
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name1, name2, nc+i);
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print(Lflag?" line %lld\n":"\n", l);
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exits("differ");
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}
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print("%6lld 0x%.2x 0x%.2x\n", nc+i, *p, *q);
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}
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}
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}
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if(Lflag)
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for(p = b1s; p < b1e;)
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if(*p++ == '\n')
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l++;
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nc += n;
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b1s += n;
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b2s += n;
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}
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if (b1e - b1s < 0 || b2e - b2s < 0) {
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if (!sflag) {
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if (b1e - b1s < 0)
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print("error on %s after %lld bytes\n",
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name1, nc-1);
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if (b2e - b2s < 0)
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print("error on %s after %lld bytes\n",
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name2, nc-1);
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}
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exits("read error");
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}
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if(b1e - b1s == b2e - b2s)
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exits((char *)0);
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if(!sflag)
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print("EOF on %s after %lld bytes\n",
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(b1e - b1s > b2e - b2s)? name2 : name1, nc-1);
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exits("EOF");
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}
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static void
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usage(void)
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{
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print("usage: cmp [-lLs] file1 file2 [offset1 [offset2] ]\n");
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exits("usage");
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}
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