UNIX — универсальная среда программирования - Керниган Брайан Уилсон
#include <stdio.h>
#include <ctype.h>
char *progname;
#define HUGE 10000 /* large number of lines */
main(argc, argv)
int argc;
char *argv[];
{
FILE *fin, *fout, *f1, *f2, *efopen();
char buf[BUFSIZ], *mktemp();
char *diffout = "idiff.XXXXXX";
progname = argv[0];
if (argc != 3) {
fprintf(stderr, "Usage: idiff file1 file2n");
exit(1);
}
f1 = efopen(argv[1], "r");
f2 = efopen(argv[2], "r");
fout = efopen("idiff.out", "w");
mktemp(diffout);
sprintf(buf, "diff %s %s >%s", argv[1], argv[2], diffout);
system(buf);
fin = efopen(diffout, "r");
idiff(f1, f2, fin, fout); unlink(diffout);
printf("%s output in file idiff.outn", progname);
exit(0);
}
idiff(f1, f2, fin, fout) /* process diffs */
FILE *f1, *f2, *fin, *fout;
{
char *tempfile = "idiff.XXXXXX";
char buf[BUFSIZ], buf2[BUFSIZ], *mktemp();
FILE *ft, *efopen();
int cmd, n, from1, to1, from2, to2, nf1, nf2;
mktemp(tempfile);
nf1 = nf2 = 0;
while (fgets(buf, sizeof buf, fin) != NULL) {
parse(buf, &from1, &to1, &cmd, &from2, &to2);
n = to1-from1 + to2-from2 + 1; /* #lines from diff */
if (cmd == 'c')
n += 2;
else if (cmd == 'a')
from1++;
else if (cmd == 'd')
from2++;
printf("%s", buf);
while (n-- > 0) {
fgets(buf, sizeof buf, fin);
printf("%s", buf);
}
do {
printf("? ");
fflush(stdout);
fgets(buf, sizeof buf, stdin);
switch (buf[0]) {
case '>':
nskip(f1, to1-nf1);
ncopy(f2, to2-nf2, fout);
break;
case '<':
nskip(f2, to2-nf2);
ncopy(f1, to1-nf1, fout);
break;
case 'e':
ncopy(f1, from1-1-nf1, fout);
nskip(f2, from2-1-nf2);
ft = efopen(tempfile, "w");
ncopy(f1, to1+1-from1, ft);
fprintf(ft, "--- n");
ncopy(f2, to2+1-from2, ft);
fclose(ft);
sprintf(buf2, "ed %s", tempfile);
system(buf2);
ft = efopen(tempfile, "r");
ncopy(ft, HUGE, fout);
fclose(ft);
break;
case '!':
system(buf+1);
printf("!n");
break;
default:
printf("< or > or e or !n");
break;
}
} while (buf[0]!= '<' && buf[0]!= '>' && buf[0]! = 'e');
nf1 = to1;
nf2 = to2;
}
ncopy(f1, HUGE, fout); /* can fail on very long files */
unlink(tempfile);
}
parse(s, pfrom1, pto1, pcmd, pfrom2, pto2)
char *s;
int *pcmd, *pfrom1, *pto1, *pfrom2, *pto2;
{
#define a2i(p) while (isdigit(*s))
p = 10*(p) + *s++ - '0'
*pfrom1 = *pto1 = *pfrom2 = *pto2 = 0;
a2i(*pfrom1);
if (*s == ',') {
s++;
a2i(*pto1);
