UNIX — универсальная среда программирования

Керниган Брайан Уилсон

 -i) INPUT=$2; shift ;;

 -o) OUTPUT=$2; shift ;;

 -[0-9]) VERSION=$1 ;;

 -*) echo "get: Unknown argument $i" 1>&2; exit 1 ;;

 *) case "$OUTPUT" in

"") OUTPUT=$1 ;;

*) INPUT=$1.H ;;

esac

 esac

 shift

done

OUTPUT=${OUTPUT?"Usage: get [-o outfile] [-i file.H] file"}

INPUT=${INPUT-$OUTPUT.H}

test -r $INPUT || { echo "get: no file $INPUT" 1>&2; exit 1; }

trap 'rm -f /tmp/get.[ab]$$; exit 1' 1 2 15

# split into current version and editing commands

sed <$INPUT -n '1,/^@@@/w /tmp/get.a'$$'

/^@@@/,$w /tmp/get.b'$$

# perform the edits

awk </tmp/get.b$$ '

 /^@@@/ { count++ }

 !/^@@@/ && count > 0 && count <= - '$VERSION'

 END { print "$d"; print "w", "'$OUTPUT'" }

' | ed - /tmp/get.a$$

rm -f /tmp/get.[ab]$$

3.8.25

get.с

get(fd, pos, buf, n) /* read n bytes from position pos */

 int fd, n;

 long pos;

 char *buf;

{

 if (lseek(fd, pos, 0) == -1) /* get to pos */

return -1;

 return read(fd, buf, n);

}

3.8.26

getname

who am i | sed 's/ .*//'

3.8.27

idiff.c

/* idiff: interactive diff */

#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 file2\n");

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.out\n", 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);