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annotate pager.c @ 17:a08ef0674d8e

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Page long output in interactive mode
author Guido Berhoerster <guido+pwm@berhoerster.name>
date Sat, 12 Aug 2017 10:41:52 +0200
parents
children 1e39a251cbe9
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17
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1 /*
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2 * Copyright (C) 2017 Guido Berhoerster <guido+pwm@berhoerster.name>
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3 *
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4 * Permission is hereby granted, free of charge, to any person obtaining
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5 * a copy of this software and associated documentation files (the
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6 * "Software"), to deal in the Software without restriction, including
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7 * without limitation the rights to use, copy, modify, merge, publish,
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8 * distribute, sublicense, and/or sell copies of the Software, and to
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9 * permit persons to whom the Software is furnished to do so, subject to
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10 * the following conditions:
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11 *
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12 * The above copyright notice and this permission notice shall be included
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13 * in all copies or substantial portions of the Software.
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14 *
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 */
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23
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24 #include "compat.h"
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25
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26 #ifdef HAVE_ERR_H
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27 #include <err.h>
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28 #endif /* HAVE_ERR_H */
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29 #include <errno.h>
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30 #include <fcntl.h>
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31 #include <limits.h>
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32 #include <signal.h>
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33 #include <stdio.h>
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34 #include <string.h>
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35 #include <sys/ioctl.h>
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36 #ifdef HAVE_SYS_QUEUE_H
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37 #include <sys/queue.h>
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38 #endif /* HAVE_SYS_QUEUE_H */
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39 #include <sys/stat.h>
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40 #include <sys/types.h>
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41 #include <termios.h>
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42 #include <unistd.h>
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43 #include <wchar.h>
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44
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45 #include "pwm.h"
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46 #include "pager.h"
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47 #include "util.h"
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48
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49 #ifndef TCSASOFT
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50 #define TCSASOFT 0
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51 #endif /* !TCSASOFT */
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52
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53 #ifndef _NSIG
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54 #ifdef NSIG
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55 #define _NSIG NSIG
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56 #else /* NSIG */
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57 #define _NSIG 128
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58 #endif /* NSIG */
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59 #endif /* !_NSIG */
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60
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61 #ifndef _PATH_TTY
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62 #define _PATH_TTY "/dev/tty"
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63 #endif
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64
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65 struct pager {
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66 TAILQ_HEAD(lines_head, lines_entry) lines_head;
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67 FILE *fp;
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68 size_t buf_size;
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69 char *buf;
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70 };
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71
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72 struct lines_entry {
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73 TAILQ_ENTRY(lines_entry) entry;
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74 char *line;
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75 };
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76
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77 static volatile sig_atomic_t signals[_NSIG];
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78
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79 static void
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80 sig_handler(int signo)
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81 {
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82 signals[signo] = 1;
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83 }
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84
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85 static int
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86 getch_prompt(const char *prompt)
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87 {
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88 int retval = -1;
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89 int signo;
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90 int fd;
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91 struct termios saved_term;
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92 struct termios term;
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93 struct sigaction sa;
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94 struct sigaction saved_sa_hup;
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95 struct sigaction saved_sa_int;
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96 struct sigaction saved_sa_quit;
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97 struct sigaction saved_sa_pipe;
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98 struct sigaction saved_sa_alrm;
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99 struct sigaction saved_sa_term;
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100 struct sigaction saved_sa_tstp;
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101 struct sigaction saved_sa_ttin;
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102 struct sigaction saved_sa_ttou;
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103 char c;
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104 int need_restart = 0;
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105
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106 printf("%s", prompt);
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107 fflush(stdout);
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108
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109 restart:
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110 for (signo = 0; signo < _NSIG; signo++) {
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111 signals[signo] = 0;
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112 }
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113
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114 fd = open(_PATH_TTY, O_RDONLY);
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115 if (fd < 0) {
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116 return (-1);
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117 }
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118
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119 if (tcgetattr(fd, &saved_term) != 0) {
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120 close(fd);
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121 return (-1);
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122 }
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123 memcpy(&term, &saved_term, sizeof (struct termios));
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124
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125 /* enter raw mode and turn echo off */
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126 term.c_lflag &= ~(ICANON | ECHO);
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127 while ((tcsetattr(fd, TCSAFLUSH | TCSASOFT, &term) < 0) &&
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128 (errno != EINTR)) {
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129 continue;
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130 }
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131
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132 /* install temporary signal handler */
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133 sigemptyset(&sa.sa_mask);
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134 sa.sa_flags = 0;
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135 sa.sa_handler = sig_handler;
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136 sigaction(SIGHUP, &sa, &saved_sa_hup);
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137 sigaction(SIGINT, &sa, &saved_sa_int);
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138 sigaction(SIGQUIT, &sa, &saved_sa_quit);
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139 sigaction(SIGPIPE, &sa, &saved_sa_pipe);
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140 sigaction(SIGALRM, &sa, &saved_sa_alrm);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
141 sigaction(SIGTERM, &sa, &saved_sa_term);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
142 sigaction(SIGTSTP, &sa, &saved_sa_tstp);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
143 sigaction(SIGTTIN, &sa, &saved_sa_ttin);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
144 sigaction(SIGTTOU, &sa, &saved_sa_ttou);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
145
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
146 /* read key */
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
147 if (read(fd, &c, 1) == sizeof (c)) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
148 retval = c;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
149 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
150
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
151 /* restore previous mode and echo setting */
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
152 do {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
153 while ((tcsetattr(fd, TCSAFLUSH | TCSASOFT,
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
154 &saved_term) < 0) && (errno != EINTR)) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
155 continue;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
156 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
157 } while ((tcgetattr(fd, &term) == 0) &&
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
158 (term.c_lflag != saved_term.c_lflag));
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
159
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
160 /* restore previous signal handlers */
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
161 sigaction(SIGHUP, &saved_sa_hup, &sa);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
162 sigaction(SIGINT, &saved_sa_int, &sa);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
163 sigaction(SIGQUIT, &saved_sa_quit, &sa);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
164 sigaction(SIGPIPE, &saved_sa_pipe, &sa);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
165 sigaction(SIGALRM, &saved_sa_alrm, &sa);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
166 sigaction(SIGTERM, &saved_sa_term, &sa);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
167 sigaction(SIGTSTP, &saved_sa_tstp, &sa);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
168 sigaction(SIGTTIN, &saved_sa_ttin, &sa);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
169 sigaction(SIGTTOU, &saved_sa_ttou, &sa);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
170
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
171 /* erase prompt */
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
172 printf("\r%*s\r", (int)strlen(prompt), "");
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
173 fflush(stdout);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
174
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
175 while ((close(fd) < 0) && (errno != EINTR)) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
176 continue;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
177 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
178
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
179 /* re-raise signals received */
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
180 for (signo = 0; signo < _NSIG; signo++) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
181 if (signals[signo]) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
182 raise(signo);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
183 if ((signo == SIGTSTP) || (signo == SIGTTIN) ||
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
184 (signo == SIGTTOU)) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
185 need_restart = 1;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
186 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
187 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
188 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
189 if (need_restart) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
190 goto restart;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
191 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
192
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
193 return (retval);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
194 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
195
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
196 struct pager *
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
197 pager_create(FILE *fp)
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
198 {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
199 struct pager *pager;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
200
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
201 pager = xmalloc(sizeof (struct pager));
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
202 TAILQ_INIT(&pager->lines_head);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
203 pager->fp = fp;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
204 pager->buf_size = BUFSIZ;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
205 pager->buf = xmalloc(BUFSIZ);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
206
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
207 return (pager);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
208 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
209
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
210 void
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
211 pager_destroy(struct pager *pager)
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
212 {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
213 struct lines_entry *entry;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
214 struct lines_entry *entry_tmp;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
215
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
216 if (pager == NULL) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
217 return;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
218 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
219
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
220 TAILQ_FOREACH_SAFE(entry, &pager->lines_head, entry, entry_tmp) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
221 TAILQ_REMOVE(&pager->lines_head, entry, entry);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
222 free(entry->line);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
223 free(entry);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
224 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
225 free(pager->buf);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
226 free(pager);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
227 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
228
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
229 int
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
230 pager_vprintf(struct pager *pager, const char *fmt, va_list args)
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
231 {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
232 int len;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
233 va_list args_new;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
234 char *p;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
235 size_t line_len;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
236 struct lines_entry *entry;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
237 size_t line_offset;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
238
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
239 va_copy(args_new, args);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
240
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
241 /* format multibyte string in buffer */
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
242 len = vsnprintf(NULL, 0, fmt, args);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
243 if (len < 0) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
244 err(1, "vsnprintf");
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
245 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
246
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
247 if (pager->buf_size < (size_t)len + 1) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
248 pager->buf_size = len + 1;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
249 pager->buf = xrealloc(pager->buf, pager->buf_size);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
250 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
251
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
252 len = vsnprintf(pager->buf, pager->buf_size, fmt, args_new);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
253 if (len < 0) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
254 err(1, "vsnprintf");
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
255 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
256
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
257 /* split buffer into lines */
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
258 for (p = pager->buf; *p != '\0'; p += line_len) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
259 line_len = strcspn(p, "\n");
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
260 if (p[line_len] == '\n') {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
261 line_len++;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
262 }
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
263
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
264 entry = TAILQ_LAST(&pager->lines_head, lines_head);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
265 line_offset = (entry != NULL) ? strlen(entry->line) : 0;
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
266 if ((entry != NULL) && (entry->line[line_offset - 1] != '\n')) {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
267 /*
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
268 * append to the last line if it doesn't end with a
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
269 * newline
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
270 */
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
271 entry->line = xrealloc(entry->line, line_offset +
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
272 line_len + 1);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
273 memcpy(entry->line + line_offset, p, line_len);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
274 entry->line[line_offset + line_len] = '\0';
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
275 } else {
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
276 entry = xmalloc(sizeof (struct lines_entry));
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
277 entry->line = xmalloc(line_len + 1);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
278 memcpy(entry->line, p, line_len);
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
279 entry->line[line_len] = '\0';
a08ef0674d8e Page long output in interactive mode
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
280 TAILQ_INSERT_TAIL(&pager->lines_head, entry, entry);
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diff changeset
281 }
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282 }
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diff changeset
283
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diff changeset
284 va_end(args_new);
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diff changeset
285
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diff changeset
286 return (len);
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parents:
diff changeset
287 }
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288
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diff changeset
289 int
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290 pager_printf(struct pager *pager, const char *fmt, ...)
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parents:
diff changeset
291 {
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diff changeset
292 int len;
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293 va_list args;
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294
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295 va_start(args, fmt);
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296 len = pager_vprintf(pager, fmt, args);
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297 va_end(args);
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298
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299 return (len);
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300 }
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301
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diff changeset
302 static unsigned int
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303 mbsnprint(unsigned int cols, const char *s, FILE *fp)
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diff changeset
304 {
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305 const char *p = s;
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diff changeset
306 unsigned int col = 0;
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diff changeset
307 int mb_len;
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Guido Berhoerster <guido+pwm@berhoerster.name>
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diff changeset
308 wchar_t wc;
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Guido Berhoerster <guido+pwm@berhoerster.name>
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diff changeset
309 int width;
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diff changeset
310 char mb_buf[MB_LEN_MAX];
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Guido Berhoerster <guido+pwm@berhoerster.name>
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diff changeset
311
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Guido Berhoerster <guido+pwm@berhoerster.name>
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diff changeset
312 while ((*p != '\n') && (*p != '\0') && (col < cols)) {
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Guido Berhoerster <guido+pwm@berhoerster.name>
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313 mb_len = mbtowc(&wc, p, MB_CUR_MAX);
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314 if (mb_len != -1) {
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Guido Berhoerster <guido+pwm@berhoerster.name>
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diff changeset
315 width = wcwidth(wc);
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diff changeset
316 if (width != -1) {
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Guido Berhoerster <guido+pwm@berhoerster.name>
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diff changeset
317 if (snprintf(mb_buf, sizeof (mb_buf), "%.*s",
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diff changeset
318 mb_len, p) != mb_len) {
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Guido Berhoerster <guido+pwm@berhoerster.name>
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diff changeset
319 err(1, "snprintf");
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diff changeset
320 }
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321 } else {
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Guido Berhoerster <guido+pwm@berhoerster.name>
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322 /*
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323 * non-printable character, print
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324 * replacement character
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325 */
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326 width = 1;
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327 if (snprintf(mb_buf, sizeof (mb_buf),
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328 "\357\277\275") != 3) {
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329 err(1, "snprintf");
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330 }
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331 }
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332 } else {
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333 /*
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334 * decoding failed, reset state and skip one
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335 * byte
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336 */
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337 mbtowc(NULL, NULL, MB_CUR_MAX);
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338 mb_len = 1;
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339
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340 /* print replacement character */
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341 width = 1;
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diff changeset
342 if (snprintf(mb_buf, sizeof (mb_buf),
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
343 "\357\277\275") != 3) {
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344 err(1, "snprintf");
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345 }
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346 }
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347
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348 p += mb_len;
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349 col += width;
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diff changeset
350 if (col <= cols) {
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351 if (fputs(mb_buf, fp) == EOF) {
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diff changeset
352 err(1, "fputs");
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Guido Berhoerster <guido+pwm@berhoerster.name>
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diff changeset
353 }
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354 }
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355 }
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diff changeset
356
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357 fputc('\n', fp);
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358 fflush(fp);
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diff changeset
359
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diff changeset
360 return (col);
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parents:
diff changeset
361 }
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diff changeset
362
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Guido Berhoerster <guido+pwm@berhoerster.name>
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diff changeset
363 void
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diff changeset
364 pager_show(struct pager *pager)
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diff changeset
365 {
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diff changeset
366 int is_interactive;
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diff changeset
367 unsigned int rows = 24;
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diff changeset
368 unsigned int cols = 80;
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diff changeset
369 #ifdef TIOCGWINSZ
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diff changeset
370 struct winsize ws;
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diff changeset
371 #endif /* TIOCGWINSZ */
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diff changeset
372 unsigned int row = 0;
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diff changeset
373 struct lines_entry *entry;
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parents:
diff changeset
374
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diff changeset
375 is_interactive = (isatty(STDIN_FILENO) && (pager->fp == stdout));
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parents:
diff changeset
376
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diff changeset
377 #ifdef TIOCGWINSZ
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diff changeset
378 if (is_interactive) {
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
379 /* determine terminal size */
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
380 if (ioctl(fileno(pager->fp), TIOCGWINSZ, &ws) == 0) {
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
381 rows = (ws.ws_row > 0) ? ws.ws_row : rows;
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parents:
diff changeset
382 cols = (ws.ws_col > 0) ? ws.ws_col : cols;
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
383 }
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
384 }
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
385 #endif /* TIOCGWINSZ */
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
386
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diff changeset
387 TAILQ_FOREACH(entry, &pager->lines_head, entry) {
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
388 if (is_interactive) {
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
389 mbsnprint(cols, entry->line, pager->fp);
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
390 row++;
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
391 if (row == rows - 1) {
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
392 getch_prompt("--More--");
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
393 row = 0;
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
394 }
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
395 } else {
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
396 fprintf(pager->fp, "%s", entry->line);
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
397 fflush(pager->fp);
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
398 }
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
399 }
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Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
400 }