UNIX — универсальная среда программирования

Керниган Брайан Уилсон

 if (argc > 1 && argv[1][0] == '-') {

pagesize = atoi(&argv[1][1]);

argc--;

argv++;

 }

 if (argc == 1)

print(stdin, pagesize);

 for (i = 1; i < argc; i++) {

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"

3.8.40

p3.c

/* p: print input in chunks (version 3) */

#include <stdio.h>

#define PAGESIZE 22

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

main(argc, argv)

 int argc;

 char *argv[];

{

 FILE *fp, *efopen;

 int i, pagesize = PAGESIZE;

 char *p, *getenv;

 progname = argv[0];

 if ((p=getenv("PAGESIZE")) != NULL)

pagesize = atoi(p);

 if (argc > 1 && argv[1][0] == '-') {

pagesize = atoi(&argv[1][1]);

argc--;

argv++;

 }

 if (argc == 1)

print(stdin, pagesize);

 else

for (i = 1; i < argc; i++) {

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"

3.8.41

p4.c

/* p: print input in chunks (version 4) */

#include <stdio.h>

#define PAGESIZE 22

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

main(argc, argv)

 int argc;

 char *argv[];

{

 FILE *fp, *efopen;

 int i, pagesize = PAGESIZE;

 char *p, *getenv, buf[BUFSIZ];

 progname = argv[0];

 if ((p=getenv("PAGESIZE")) != NULL)

pagesize = atoi(p);

 if (argc > 1 && argv[1][0] == '-') {

pagesize = atoi(&argv[1][1]);

argc--;

argv++;

 }

 if (argc == 1)

print(stdin, pagesize);

 else

for (i = 1; i < argc; i++)

switch (spname(argv[i], buf)) {

case -1: /* no match possible */

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

break;

case 1: /* corrected */

fprintf (stderr, "\"%s\"? ", buf);

if (ttyin == 'n')

break;

argv[i] = buf;