UNIX — универсальная среда программирования

Керниган Брайан Уилсон

/* fall through... */

case 0: /* exact match */

fp = efopen(argv[i], "r");

print(fp, pagesize);

fclose(fp);

}

 exit(0);

}

print(fp, pagesize) /* print fp in pagesize chunks */

 FILE *fp;

 int pagesize;

{

 static int lines = 0; /* number of lines so far */

 char buf[BUFSIZ];

 while (fgets(buf, sizeof buf, fp) != NULL)

if (++lines < pagesize) fputs(buf, stdout);

else {

buf[strlen(buf)-1] = '\0';

fputs(buf, stdout);

fflush(stdout);

ttyin;

lines = 0;

}

}

#include "ttyin2.c"

#include "efopen.c"

#include "spname.c"

3.8.42

pick1

# pick: select arguments

PATH=/bin:/usr/bin

for i # for each argument

do

 echo -n "$i? " >/dev/tty

 read response

 case $response in

 y*) echo $i ;;

 q*) break

 esac

done </dev/tty

3.8.43

pick.c

/* pick: offer choice on each argument */

#include <stdio.h>

char *progname; /* program name for error message */

main(argc, argv)

 int argc;

 char *argv[];

{

 int i;

 char buf[BUFSIZ];

 progname = argv[0];

 if (argc == 2 && strcmp(argv[1], "-") == 0) /* pick - */

while (fgets(buf, sizeof buf, stdin) != NULL) {

buf[strlen(buf)-1] = '\0'; /* drop newline */

pick(buf);

}

 for (i = 1; i < argc; i++)

pick(argv[i]);

 exit(0);

}

pick(s) /* offer choice of s */

 char *s;

{

 fprintf(stderr, "%s? ", s);

 if (ttyin == 'y')

printf("%s\n", s);

}

#include "ttyin2.c"

#include "efopen.c"

3.8.44

prpages

# prpages: compute number of pages that pr will print

wc $* |

awk '!/ total$/ { n += int(($1+55) / 56) }

 END { print n }'

3.8.45

put

# put: install file into history

PATH=/bin:/usr/bin

case $# in

1) HIST=$1.H ;;

*) echo 'Usage: put file' 1>&2; exit 1 ;;

esac

if test !
– r $1

then

 echo "put: can't open $1" 1>&2

 exit 1

fi

trap 'rm -f /tmp/put.[ab]$$; exit 1 12 15

echo -n 'Summary: '

read Summary

if get -o /tmp/put.a$$ $1 # previous version

then # merge pieces

 cp $1 /tmp/put.b$$ # current version

 echo `getname` `date` $Summary" >>/tmp/put.b$$

 diff -e $1 /tmp/put.a$$ >>/tmp/put.b$$ # latest diffs

 sed -n '/^@@@/,$р' <$HIST >>/tmp/put.b$$ # old diffs

 overwrite $HIST cat /tmp/put.b$$ # put it back

else # make a new one

 echo "put: creating $HIST"

 cp $1 $HIST

 echo "@@@ `getname` `date` $Summary" >>$HIST

fi

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

3.8.46

readslow.c

/* readslow: keep reading, waiting for more */

#define SIZE 512 /* arbitrary */

main {

 char buf[SIZE];