scoutos / prex-0.9.0 / usr / bin / more / more.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2009, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #include <sys/termios.h> |
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31 | #include <sys/ioctl.h> |
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32 | |||
33 | #include <stdio.h> |
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34 | #include <stdlib.h> |
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35 | #include <unistd.h> |
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36 | #include <err.h> |
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37 | |||
38 | #ifdef CMDBOX
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39 | #define main(argc, argv) more_main(argc, argv)
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40 | #endif
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41 | |||
42 | static void do_more(FILE *, int); |
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43 | |||
44 | int
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45 | main(int argc, char *argv[]) |
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46 | { |
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47 | struct winsize ws;
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48 | int ch;
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49 | FILE *fp = NULL;
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50 | int height = 25; |
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51 | int rval = 0; |
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52 | |||
53 | while ((ch = getopt(argc, argv, "")) != -1) |
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54 | switch(ch) {
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55 | case '?': |
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56 | default:
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57 | fprintf(stderr, "usage: more [file ...]\n");
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58 | exit(1);
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59 | /* NOTREACHED */
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60 | } |
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61 | argc -= optind; |
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62 | argv += optind; |
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63 | |||
64 | if (ioctl(0, TIOCGWINSZ, &ws) == 0) |
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65 | height = (int)ws.ws_row;
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66 | |||
67 | if (*argv) {
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68 | for (; *argv; ++argv) {
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69 | if ((fp = fopen(*argv, "r")) == NULL) { |
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70 | warn("%s", *argv);
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71 | ++argv; |
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72 | rval = 1;
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73 | continue;
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74 | } |
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75 | do_more(fp, height); |
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76 | (void)fclose(fp);
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77 | } |
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78 | } else
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79 | do_more(stdin, height); |
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80 | |||
81 | exit(rval); |
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82 | } |
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83 | |||
84 | static void |
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85 | do_more(FILE *fp, int maxlines)
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86 | { |
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87 | int c, len, lines = 0; |
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88 | |||
89 | while ((c = getc(fp)) != EOF) { |
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90 | if (c == '\n' && ++lines >= maxlines) { |
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91 | len = printf("\n--More-- ");
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92 | fflush(stdout); |
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93 | read(2, &c, 1); |
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94 | |||
95 | printf("\033[1A"); /* up cursor */ |
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96 | putc('\r', stdout);
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97 | while (--len >= 0) |
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98 | putc(' ', stdout);
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99 | putc('\r', stdout);
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100 | len = 0;
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101 | lines = 0;
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102 | } else
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103 | putchar(c); |
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104 | } |
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105 | putchar('\n');
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106 | } |