/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
- /*-
- * 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;
- }