head(1): increase line count maximum to LLONG_MAX

[Scott Cheloha]

This unifies the input maximums on 32-bit and 64-bit platforms.

ok?

Index: head.c
===================================================================
RCS file: /cvs/src/usr.bin/head/head.c,v
retrieving revision 1.22
diff -u -p -r1.22 head.c
--- head.c      10 Oct 2021 15:57:25 -0000      1.22
+++ head.c      11 Oct 2021 00:09:31 -0000
@@ -50,9 +50,9 @@ main(int argc, char *argv[])
 {
        const char *errstr;
        FILE    *fp;
-       long    cnt;
+       long long cnt;
        int     ch, firsttime;
-       long    linecnt = 10;
+       long long linecnt = 10;
        int     status = 0;
 
        if (pledge("stdio rpath", NULL) == -1)
@@ -61,7 +61,7 @@ main(int argc, char *argv[])
        /* handle obsolete -number syntax */
        if (argc > 1 && argv[1][0] == '-' &&
            isdigit((unsigned char)argv[1][1])) {
-               linecnt = strtonum(argv[1] + 1, 1, LONG_MAX, &errstr);
+               linecnt = strtonum(argv[1] + 1, 1, LLONG_MAX, &errstr);
                if (errstr != NULL)
                        errx(1, "count is %s: %s", errstr, argv[1] + 1);
                argc--;
@@ -71,7 +71,7 @@ main(int argc, char *argv[])
        while ((ch = getopt(argc, argv, "n:")) != -1) {
                switch (ch) {
                case 'n':
-                       linecnt = strtonum(optarg, 1, LONG_MAX, &errstr);
+                       linecnt = strtonum(optarg, 1, LLONG_MAX, &errstr);
                        if (errstr != NULL)
                                errx(1, "count is %s: %s", errstr, optarg);
                        break;