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/*-
* Copyright (c) 1998 Eric P. Scott <eps@sirius.com>
* Copyright (c) 1998 Andrzej Bialecki <abial@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <stdio.h>
#include <string.h>
#include <ar.h>
#include <sys/ioctl.h>
int display(FILE *, const char *);
static int cnt, crt=-1;
int
main(int argc, char *argv[])
{
register int i, s;
FILE *fd;
struct ttysize ts;
if (!(fd=fopen("/help.a", "r"))) {
(void)fputs("Couldn't open help archive.\n", stderr);
exit(1);
}
cnt=0;
if (ioctl(fileno(stdout), TIOCGWINSZ, &ts)>=0) {
crt=ts.ts_lines-1;
}
if (crt<3) crt=23;
s=display(fd, argc>1 ? argv[1] : "help");
if (s<0) s=0;
else for (i=2;i<argc;) {
rewind(fd);
s|=display(fd, argv[i++]);
if (s<0) {
s=0;
break;
}
}
(void)fclose(fd);
exit(s);
}
int
more(void)
{
char buf[8];
(void)fflush(stdout);
(void)fputs("\033[7mPress Enter to continue\033[m", stderr);
(void)fflush(stderr);
cnt=0;
if (fgets(buf, sizeof buf, stdin)) return 0;
(void)fputc('\n', stderr);
return 1;
}
int
display(FILE *fd, const char *fname)
{
register char *p;
register int c, n, o;
struct ar_hdr ar;
char aname[20];
if (!fgets(aname, sizeof aname, fd)) {
return 1;
}
if (strncmp(aname, ARMAG, SARMAG)) return 1;
(void)snprintf(aname, sizeof(aname), "%s/", fname);
for (;;) {
if (fread((void *)&ar, sizeof ar, 1, fd)!=1) return 1;
if (strncmp(ar.ar_fmag, ARFMAG, 2)) return 1;
n=0;
p=ar.ar_size;
do {
if ((c=(int)(*p++-'0'))<0||c>9) break;
n*=10; n+=c;
} while (p<&ar.ar_size[sizeof ar.ar_size]);
if (!strncmp(ar.ar_name, aname, strlen(aname))) break;
if (fseek(fd, (long)n, SEEK_CUR)<0) return 1;
if ((n&1)&&fgetc(fd)!='\n') return 1;
}
if (cnt>=crt&&more()) return -1;
(void)fputc('\n', stdout);
cnt++;
o=0; while (o<n&&(c=fgetc(fd))!=EOF) {
per:
o++;
(void)fputc(c, stdout);
if (c!='\n') continue;
if (++cnt<crt) continue;
if (o>=n||(c=fgetc(fd))==EOF) break;
if (more()) return -1;
goto per;
}
if (cnt>=crt&&more()) return -1;
(void)fputc('\n', stdout);
cnt++;
if (!strcmp(fname, "help")) {
rewind(fd);
(void)fgets(aname, sizeof aname, fd);
if (cnt>=crt&&more()) return -1;
(void)fputs("The following help items are available:\n",
stdout);
cnt++;
o=0;
while (fread((void *)&ar, sizeof ar, 1, fd)==1) {
if (strncmp(ar.ar_fmag, ARFMAG, 2)) break;
if ((o%6)==0) {
(void)fputc('\n', stdout);
if (++cnt>=crt&&more()) return -1;
}
*(index(ar.ar_name,'/'))=' ';
(void)printf("%.13s", ar.ar_name);
++o;
n=0;
p=ar.ar_size;
do {
if ((c=(int)(*p++-'0'))<0||c>9) break;
n*=10; n+=c;
} while (p<&ar.ar_size[sizeof ar.ar_size]);
if (fseek(fd, (long)n, SEEK_CUR)<0) break;
if ((n&1)&&fgetc(fd)!='\n') break;
}
if (cnt>=crt&&more()) return -1;
(void)fputc('\n', stdout);
cnt++;
}
return 0;
}
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