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/release/picobsd/tinyware/help/help.c

https://bitbucket.org/freebsd/freebsd-head/
C | 157 lines | 119 code | 10 blank | 28 comment | 36 complexity | c248637285b9f0ccae7c103aa7a06017 MD5 | raw file
  1/*-
  2 * Copyright (c) 1998 Eric P. Scott <eps@sirius.com>
  3 * Copyright (c) 1998 Andrzej Bialecki <abial@freebsd.org>
  4 * All rights reserved.
  5 *
  6 * Redistribution and use in source and binary forms, with or without
  7 * modification, are permitted provided that the following conditions
  8 * are met:
  9 * 1. Redistributions of source code must retain the above copyright
 10 *    notice, this list of conditions and the following disclaimer.
 11 * 2. Redistributions in binary form must reproduce the above copyright
 12 *    notice, this list of conditions and the following disclaimer in the
 13 *    documentation and/or other materials provided with the distribution.
 14 *
 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 25 * SUCH DAMAGE.
 26 *
 27 * $FreeBSD$
 28 */
 29
 30
 31#include <stdio.h>
 32#include <string.h>
 33#include <ar.h>
 34#include <sys/ioctl.h>
 35
 36int display(FILE *, const char *);
 37
 38static int cnt, crt=-1;
 39
 40int
 41main(int argc, char *argv[])
 42{
 43	register int i, s;
 44	FILE *fd;
 45	struct ttysize ts;
 46
 47	if (!(fd=fopen("/help.a", "r"))) {
 48		(void)fputs("Couldn't open help archive.\n", stderr);
 49		exit(1);
 50	}
 51	cnt=0;
 52	if (ioctl(fileno(stdout), TIOCGWINSZ, &ts)>=0) {
 53		crt=ts.ts_lines-1;
 54	}
 55	if (crt<3) crt=23;
 56	s=display(fd, argc>1 ? argv[1] : "help");
 57	if (s<0) s=0;
 58	else for (i=2;i<argc;) {
 59		rewind(fd);
 60		s|=display(fd, argv[i++]);
 61		if (s<0) {
 62			s=0;
 63			break;
 64		}
 65	}
 66	(void)fclose(fd);
 67	exit(s);
 68}
 69
 70int
 71more(void)
 72{
 73	char buf[8];
 74
 75	(void)fflush(stdout);
 76	(void)fputs("\033[7mPress Enter to continue\033[m", stderr);
 77	(void)fflush(stderr);
 78	cnt=0;
 79	if (fgets(buf, sizeof buf, stdin)) return 0;
 80	(void)fputc('\n', stderr);
 81	return 1;
 82}
 83
 84int
 85display(FILE *fd, const char *fname)
 86{
 87	register char *p;
 88	register int c, n, o;
 89	struct ar_hdr ar;
 90	char aname[20];
 91
 92	if (!fgets(aname, sizeof aname, fd)) {
 93		return 1;
 94	}
 95	if (strncmp(aname, ARMAG, SARMAG)) return 1;
 96	(void)snprintf(aname, sizeof(aname), "%s/", fname);
 97	for (;;) {
 98		if (fread((void *)&ar, sizeof ar, 1, fd)!=1) return 1;
 99		if (strncmp(ar.ar_fmag, ARFMAG, 2)) return 1;
100		n=0;
101		p=ar.ar_size;
102		do {
103			if ((c=(int)(*p++-'0'))<0||c>9) break;
104			n*=10; n+=c;
105		} while (p<&ar.ar_size[sizeof ar.ar_size]);
106		if (!strncmp(ar.ar_name, aname, strlen(aname))) break;
107		if (fseek(fd, (long)n, SEEK_CUR)<0) return 1;
108		if ((n&1)&&fgetc(fd)!='\n') return 1;
109	}
110	if (cnt>=crt&&more()) return -1;
111	(void)fputc('\n', stdout);
112	cnt++;
113	o=0; while (o<n&&(c=fgetc(fd))!=EOF) {
114	per:
115		o++;
116		(void)fputc(c, stdout);
117		if (c!='\n') continue;
118		if (++cnt<crt) continue;
119		if (o>=n||(c=fgetc(fd))==EOF) break;
120		if (more()) return -1;
121		goto per;
122	}
123	if (cnt>=crt&&more()) return -1;
124	(void)fputc('\n', stdout);
125	cnt++;
126	if (!strcmp(fname, "help")) {
127		rewind(fd);
128		(void)fgets(aname, sizeof aname, fd);
129		if (cnt>=crt&&more()) return -1;
130		(void)fputs("The following help items are available:\n",
131			stdout);
132		cnt++;
133		o=0;
134		while (fread((void *)&ar, sizeof ar, 1, fd)==1) {
135			if (strncmp(ar.ar_fmag, ARFMAG, 2)) break;
136			if ((o%6)==0) {
137				(void)fputc('\n', stdout);
138				if (++cnt>=crt&&more()) return -1;
139			}
140			*(index(ar.ar_name,'/'))=' ';
141			(void)printf("%.13s", ar.ar_name);
142			++o;
143			n=0;
144			p=ar.ar_size;
145			do {
146				if ((c=(int)(*p++-'0'))<0||c>9) break;
147				n*=10; n+=c;
148			} while (p<&ar.ar_size[sizeof ar.ar_size]);
149			if (fseek(fd, (long)n, SEEK_CUR)<0) break;
150			if ((n&1)&&fgetc(fd)!='\n') break;
151		}
152		if (cnt>=crt&&more()) return -1;
153		(void)fputc('\n', stdout);
154		cnt++;
155	}
156	return 0;
157}