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} 158