pager.c revision 1.1.4.2
1 1.1.4.2 elad /* $NetBSD: pager.c,v 1.1.4.2 2006/04/19 02:33:05 elad Exp $ */ 2 1.1.4.2 elad 3 1.1.4.2 elad /*- 4 1.1.4.2 elad * Copyright (c) 1998 Michael Smith <msmith (at) freebsd.org> 5 1.1.4.2 elad * All rights reserved. 6 1.1.4.2 elad * 7 1.1.4.2 elad * Redistribution and use in source and binary forms, with or without 8 1.1.4.2 elad * modification, are permitted provided that the following conditions 9 1.1.4.2 elad * are met: 10 1.1.4.2 elad * 1. Redistributions of source code must retain the above copyright 11 1.1.4.2 elad * notice, this list of conditions and the following disclaimer. 12 1.1.4.2 elad * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.4.2 elad * notice, this list of conditions and the following disclaimer in the 14 1.1.4.2 elad * documentation and/or other materials provided with the distribution. 15 1.1.4.2 elad * 16 1.1.4.2 elad * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 1.1.4.2 elad * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 1.1.4.2 elad * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 1.1.4.2 elad * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 1.1.4.2 elad * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 1.1.4.2 elad * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 1.1.4.2 elad * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 1.1.4.2 elad * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 1.1.4.2 elad * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.4.2 elad * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.4.2 elad * SUCH DAMAGE. 27 1.1.4.2 elad */ 28 1.1.4.2 elad /* 29 1.1.4.2 elad * Simple paged-output and paged-viewing functions 30 1.1.4.2 elad */ 31 1.1.4.2 elad 32 1.1.4.2 elad #include <sys/cdefs.h> 33 1.1.4.2 elad 34 1.1.4.2 elad #include "lib/libsa/stand.h" 35 1.1.4.2 elad 36 1.1.4.2 elad #include <bootstrap.h> 37 1.1.4.2 elad 38 1.1.4.2 elad static int p_maxlines = -1; 39 1.1.4.2 elad static int p_freelines; 40 1.1.4.2 elad 41 1.1.4.2 elad static char *pager_prompt1 = " --more-- <space> page down <enter> line down <q> quit "; 42 1.1.4.2 elad static char *pager_blank = " "; 43 1.1.4.2 elad 44 1.1.4.2 elad /* 45 1.1.4.2 elad * 'open' the pager 46 1.1.4.2 elad */ 47 1.1.4.2 elad void 48 1.1.4.2 elad pager_open(void) 49 1.1.4.2 elad { 50 1.1.4.2 elad int nlines; 51 1.1.4.2 elad char *cp, *lp; 52 1.1.4.2 elad 53 1.1.4.2 elad nlines = 24; /* sensible default */ 54 1.1.4.2 elad if ((cp = getenv("LINES")) != NULL) { 55 1.1.4.2 elad nlines = strtol(cp, &lp, 0); 56 1.1.4.2 elad } 57 1.1.4.2 elad 58 1.1.4.2 elad p_maxlines = nlines - 1; 59 1.1.4.2 elad if (p_maxlines < 1) 60 1.1.4.2 elad p_maxlines = 1; 61 1.1.4.2 elad p_freelines = p_maxlines; 62 1.1.4.2 elad } 63 1.1.4.2 elad 64 1.1.4.2 elad /* 65 1.1.4.2 elad * 'close' the pager 66 1.1.4.2 elad */ 67 1.1.4.2 elad void 68 1.1.4.2 elad pager_close(void) 69 1.1.4.2 elad { 70 1.1.4.2 elad p_maxlines = -1; 71 1.1.4.2 elad } 72 1.1.4.2 elad 73 1.1.4.2 elad /* 74 1.1.4.2 elad * Emit lines to the pager; may not return until the user 75 1.1.4.2 elad * has responded to the prompt. 76 1.1.4.2 elad * 77 1.1.4.2 elad * Will return nonzero if the user enters 'q' or 'Q' at the prompt. 78 1.1.4.2 elad * 79 1.1.4.2 elad * XXX note that this watches outgoing newlines (and eats them), but 80 1.1.4.2 elad * does not handle wrap detection (req. count of columns). 81 1.1.4.2 elad */ 82 1.1.4.2 elad 83 1.1.4.2 elad int 84 1.1.4.2 elad pager_output(const char *cp) 85 1.1.4.2 elad { 86 1.1.4.2 elad int action; 87 1.1.4.2 elad 88 1.1.4.2 elad if (cp == NULL) 89 1.1.4.2 elad return(0); 90 1.1.4.2 elad 91 1.1.4.2 elad for (;;) { 92 1.1.4.2 elad if (*cp == 0) 93 1.1.4.2 elad return(0); 94 1.1.4.2 elad 95 1.1.4.2 elad putchar(*cp); /* always emit character */ 96 1.1.4.2 elad 97 1.1.4.2 elad if (*(cp++) == '\n') { /* got a newline? */ 98 1.1.4.2 elad p_freelines--; 99 1.1.4.2 elad if (p_freelines <= 0) { 100 1.1.4.2 elad printf("%s", pager_prompt1); 101 1.1.4.2 elad action = 0; 102 1.1.4.2 elad while (action == 0) { 103 1.1.4.2 elad switch(getchar()) { 104 1.1.4.2 elad case '\r': 105 1.1.4.2 elad case '\n': 106 1.1.4.2 elad p_freelines = 1; 107 1.1.4.2 elad action = 1; 108 1.1.4.2 elad break; 109 1.1.4.2 elad case ' ': 110 1.1.4.2 elad p_freelines = p_maxlines; 111 1.1.4.2 elad action = 1; 112 1.1.4.2 elad break; 113 1.1.4.2 elad case 'q': 114 1.1.4.2 elad case 'Q': 115 1.1.4.2 elad action = 2; 116 1.1.4.2 elad break; 117 1.1.4.2 elad default: 118 1.1.4.2 elad break; 119 1.1.4.2 elad } 120 1.1.4.2 elad } 121 1.1.4.2 elad printf("\r%s\r", pager_blank); 122 1.1.4.2 elad if (action == 2) 123 1.1.4.2 elad return(1); 124 1.1.4.2 elad } 125 1.1.4.2 elad } 126 1.1.4.2 elad } 127 1.1.4.2 elad } 128 1.1.4.2 elad 129 1.1.4.2 elad /* 130 1.1.4.2 elad * Display from (fd). 131 1.1.4.2 elad */ 132 1.1.4.2 elad int 133 1.1.4.2 elad pager_file(const char *fname) 134 1.1.4.2 elad { 135 1.1.4.2 elad char buf[80]; 136 1.1.4.2 elad size_t hmuch; 137 1.1.4.2 elad int fd; 138 1.1.4.2 elad int result; 139 1.1.4.2 elad 140 1.1.4.2 elad if ((fd = open(fname, O_RDONLY)) == -1) { 141 1.1.4.2 elad printf("can't open '%s': %s\n", fname, strerror(errno)); 142 1.1.4.2 elad return(-1); 143 1.1.4.2 elad } 144 1.1.4.2 elad 145 1.1.4.2 elad for (;;) { 146 1.1.4.2 elad hmuch = read(fd, buf, sizeof(buf) - 1); 147 1.1.4.2 elad if (hmuch == -1) { 148 1.1.4.2 elad result = -1; 149 1.1.4.2 elad break; 150 1.1.4.2 elad } 151 1.1.4.2 elad if (hmuch == 0) { 152 1.1.4.2 elad result = 0; 153 1.1.4.2 elad break; 154 1.1.4.2 elad } 155 1.1.4.2 elad buf[hmuch] = 0; 156 1.1.4.2 elad if (pager_output(buf)) { 157 1.1.4.2 elad result = 1; 158 1.1.4.2 elad break; 159 1.1.4.2 elad } 160 1.1.4.2 elad } 161 1.1.4.2 elad close(fd); 162 1.1.4.2 elad return(result); 163 1.1.4.2 elad } 164
Indexes created Mon Oct 13 21:09:55 GMT 2025