| 1 | /*
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| 2 | * view.c -- a silly little viewer program
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| 3 | *
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| 4 | * written by Eric S. Raymond <esr@snark.thyrsus.com> December 1994
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| 5 | * to test the scrolling code in ncurses.
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| 6 | *
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| 7 | * modified by Thomas Dickey <dickey@clark.net> July 1995 to demonstrate
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| 8 | * the use of 'resizeterm()', and May 2000 to illustrate wide-character
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| 9 | * handling.
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| 10 | *
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| 11 | * Takes a filename argument. It's a simple file-viewer with various
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| 12 | * scroll-up and scroll-down commands.
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| 13 | *
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| 14 | * n -- scroll one line forward
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| 15 | * p -- scroll one line back
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| 16 | *
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| 17 | * Either command accepts a numeric prefix interpreted as a repeat count.
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| 18 | * Thus, typing `5n' should scroll forward 5 lines in the file.
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| 19 | *
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| 20 | * The way you can tell this is working OK is that, in the trace file,
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| 21 | * there should be one scroll operation plus a small number of line
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| 22 | * updates, as opposed to a whole-page update. This means the physical
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| 23 | * scroll operation worked, and the refresh() code only had to do a
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| 24 | * partial repaint.
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| 25 | *
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| 26 | * $Id: view.c,v 1.62 2005/05/28 21:40:25 tom Exp $
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| 27 | */
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| 28 |
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| 29 | #include <test.priv.h>
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| 30 |
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| 31 | #include <time.h>
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| 32 |
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| 33 | #undef CTRL /* conflict on AIX 5.2 with <sys/ioctl.h> */
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| 34 |
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| 35 | #if HAVE_TERMIOS_H
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| 36 | # include <termios.h>
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| 37 | #else
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| 38 | # include <sgtty.h>
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| 39 | #endif
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| 40 |
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| 41 | #if !defined(sun) || !HAVE_TERMIOS_H
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| 42 | # if HAVE_SYS_IOCTL_H
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| 43 | # include <sys/ioctl.h>
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| 44 | # endif
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| 45 | #endif
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| 46 |
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| 47 | #define my_pair 1
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| 48 |
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| 49 | /* This is needed to compile 'struct winsize' */
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| 50 | #if NEED_PTEM_H
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| 51 | #include <sys/stream.h>
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| 52 | #include <sys/ptem.h>
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| 53 | #endif
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| 54 |
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| 55 | static RETSIGTYPE finish(int sig) GCC_NORETURN;
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| 56 | static void show_all(const char *tag);
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| 57 |
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| 58 | #if defined(SIGWINCH) && defined(TIOCGWINSZ) && HAVE_RESIZE_TERM
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| 59 | #define CAN_RESIZE 1
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| 60 | #else
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| 61 | #define CAN_RESIZE 0
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| 62 | #endif
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| 63 |
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| 64 | #if CAN_RESIZE
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| 65 | static RETSIGTYPE adjust(int sig);
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| 66 | static int interrupted;
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| 67 | #endif
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| 68 |
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| 69 | static bool waiting = FALSE;
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| 70 | static int shift = 0;
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| 71 | static bool try_color = FALSE;
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| 72 |
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| 73 | static char *fname;
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| 74 | static NCURSES_CH_T **vec_lines;
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| 75 | static NCURSES_CH_T **lptr;
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| 76 | static int num_lines;
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| 77 |
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| 78 | static void
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| 79 | usage(void)
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| 80 | {
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| 81 | static const char *msg[] =
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| 82 | {
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| 83 | "Usage: view [options] file"
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| 84 | ,""
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| 85 | ,"Options:"
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| 86 | ," -c use color if terminal supports it"
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| 87 | ," -i ignore INT, QUIT, TERM signals"
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| 88 | ," -n NUM specify maximum number of lines (default 1000)"
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| 89 | #if defined(KEY_RESIZE)
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| 90 | ," -r use old-style sigwinch handler rather than KEY_RESIZE"
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| 91 | #endif
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| 92 | #ifdef TRACE
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| 93 | ," -t trace screen updates"
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| 94 | ," -T NUM specify trace mask"
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| 95 | #endif
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| 96 | };
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| 97 | size_t n;
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| 98 | for (n = 0; n < SIZEOF(msg); n++)
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| 99 | fprintf(stderr, "%s\n", msg[n]);
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| 100 | ExitProgram(EXIT_FAILURE);
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| 101 | }
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| 102 |
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| 103 | static int
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| 104 | ch_len(NCURSES_CH_T * src)
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| 105 | {
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| 106 | int result = 0;
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| 107 | #if USE_WIDEC_SUPPORT
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| 108 | #endif
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| 109 |
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| 110 | #if USE_WIDEC_SUPPORT
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| 111 | while (getcchar(src++, NULL, NULL, NULL, NULL) > 0)
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| 112 | result++;
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| 113 | #else
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| 114 | while (*src++)
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| 115 | result++;
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| 116 | #endif
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| 117 | return result;
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| 118 | }
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| 119 |
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| 120 | /*
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| 121 | * Allocate a string into an array of chtype's. If UTF-8 mode is
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| 122 | * active, translate the string accordingly.
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| 123 | */
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| 124 | static NCURSES_CH_T *
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| 125 | ch_dup(char *src)
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| 126 | {
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| 127 | unsigned len = strlen(src);
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| 128 | NCURSES_CH_T *dst = typeMalloc(NCURSES_CH_T, len + 1);
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| 129 | unsigned j, k;
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| 130 | #if USE_WIDEC_SUPPORT
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| 131 | wchar_t wstr[CCHARW_MAX + 1];
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| 132 | wchar_t wch;
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| 133 | int l = 0;
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| 134 | mbstate_t state;
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| 135 | size_t rc;
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| 136 | int width;
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| 137 | #endif
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| 138 |
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| 139 | #if USE_WIDEC_SUPPORT
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| 140 | memset(&state, 0, sizeof(state));
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| 141 | #endif
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| 142 | for (j = k = 0; j < len; j++) {
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| 143 | #if USE_WIDEC_SUPPORT
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| 144 | rc = mbrtowc(&wch, src + j, len - j, &state);
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| 145 | if (rc == (size_t) -1 || rc == (size_t) -2)
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| 146 | break;
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| 147 | j += rc - 1;
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| 148 | if ((width = wcwidth(wch)) < 0)
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| 149 | break;
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| 150 | if ((width > 0 && l > 0) || l == CCHARW_MAX) {
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| 151 | wstr[l] = L'\0';
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| 152 | l = 0;
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| 153 | if (setcchar(dst + k, wstr, 0, 0, NULL) != OK)
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| 154 | break;
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| 155 | ++k;
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| 156 | }
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| 157 | if (width == 0 && l == 0)
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| 158 | wstr[l++] = L' ';
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| 159 | wstr[l++] = wch;
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| 160 | #else
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| 161 | dst[k++] = src[j];
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| 162 | #endif
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| 163 | }
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| 164 | #if USE_WIDEC_SUPPORT
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| 165 | if (l > 0) {
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| 166 | wstr[l] = L'\0';
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| 167 | if (setcchar(dst + k, wstr, 0, 0, NULL) == OK)
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| 168 | ++k;
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| 169 | }
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| 170 | wstr[0] = L'\0';
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| 171 | setcchar(dst + k, wstr, 0, 0, NULL);
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| 172 | #else
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| 173 | dst[k] = 0;
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| 174 | #endif
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| 175 | return dst;
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| 176 | }
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| 177 |
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| 178 | int
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| 179 | main(int argc, char *argv[])
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| 180 | {
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| 181 | int MAXLINES = 1000;
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| 182 | FILE *fp;
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| 183 | char buf[BUFSIZ];
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| 184 | int i;
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| 185 | int my_delay = 0;
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| 186 | NCURSES_CH_T **olptr;
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| 187 | int value = 0;
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| 188 | bool done = FALSE;
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| 189 | bool got_number = FALSE;
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| 190 | #if CAN_RESIZE
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| 191 | bool nonposix_resize = FALSE;
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| 192 | #endif
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| 193 | const char *my_label = "Input";
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| 194 |
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| 195 | setlocale(LC_ALL, "");
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| 196 |
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| 197 | #ifndef NCURSES_VERSION
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| 198 | /*
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| 199 | * We know ncurses will catch SIGINT if we don't establish our own handler.
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| 200 | * Other versions of curses may/may not catch it.
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| 201 | */
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| 202 | (void) signal(SIGINT, finish); /* arrange interrupts to terminate */
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| 203 | #endif
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| 204 |
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| 205 | while ((i = getopt(argc, argv, "cin:rtT:")) != EOF) {
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| 206 | switch (i) {
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| 207 | case 'c':
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| 208 | try_color = TRUE;
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| 209 | break;
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| 210 | case 'i':
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| 211 | signal(SIGINT, SIG_IGN);
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| 212 | signal(SIGQUIT, SIG_IGN);
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| 213 | signal(SIGTERM, SIG_IGN);
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| 214 | break;
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| 215 | case 'n':
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| 216 | if ((MAXLINES = atoi(optarg)) < 1)
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| 217 | usage();
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| 218 | break;
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| 219 | #if CAN_RESIZE
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| 220 | case 'r':
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| 221 | nonposix_resize = TRUE;
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| 222 | break;
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| 223 | #endif
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| 224 | #ifdef TRACE
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| 225 | case 'T':
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| 226 | trace((unsigned) atoi(optarg));
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| 227 | break;
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| 228 | case 't':
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| 229 | trace(TRACE_CALLS);
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| 230 | break;
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| 231 | #endif
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| 232 | default:
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| 233 | usage();
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| 234 | }
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| 235 | }
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| 236 | if (optind + 1 != argc)
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| 237 | usage();
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| 238 |
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| 239 | if ((vec_lines = typeMalloc(NCURSES_CH_T *, MAXLINES + 2)) == 0)
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| 240 | usage();
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| 241 |
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| 242 | fname = argv[optind];
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| 243 | if ((fp = fopen(fname, "r")) == 0) {
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| 244 | perror(fname);
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| 245 | ExitProgram(EXIT_FAILURE);
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| 246 | }
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| 247 | #if CAN_RESIZE
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| 248 | if (nonposix_resize)
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| 249 | (void) signal(SIGWINCH, adjust); /* arrange interrupts to resize */
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| 250 | #endif
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| 251 |
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| 252 | /* slurp the file */
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| 253 | for (lptr = &vec_lines[0]; (lptr - vec_lines) < MAXLINES; lptr++) {
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| 254 | char temp[BUFSIZ], *s, *d;
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| 255 | int col;
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| 256 |
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| 257 | if (fgets(buf, sizeof(buf), fp) == 0)
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| 258 | break;
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| 259 |
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| 260 | /* convert tabs so that shift will work properly */
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| 261 | for (s = buf, d = temp, col = 0; (*d = *s) != '\0'; s++) {
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| 262 | if (*d == '\n') {
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| 263 | *d = '\0';
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| 264 | break;
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| 265 | } else if (*d == '\t') {
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| 266 | col = (col | 7) + 1;
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| 267 | while ((d - temp) != col)
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| 268 | *d++ = ' ';
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| 269 | } else
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| 270 | #if USE_WIDEC_SUPPORT
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| 271 | col++, d++;
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| 272 | #else
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| 273 | if (isprint(UChar(*d))) {
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| 274 | col++;
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| 275 | d++;
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| 276 | } else {
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| 277 | sprintf(d, "\\%03o", UChar(*s));
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| 278 | d += strlen(d);
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| 279 | col = (d - temp);
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| 280 | }
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| 281 | #endif
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| 282 | }
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| 283 | *lptr = ch_dup(temp);
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| 284 | }
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| 285 | (void) fclose(fp);
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| 286 | num_lines = lptr - vec_lines;
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| 287 |
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| 288 | (void) initscr(); /* initialize the curses library */
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| 289 | keypad(stdscr, TRUE); /* enable keyboard mapping */
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| 290 | (void) nonl(); /* tell curses not to do NL->CR/NL on output */
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| 291 | (void) cbreak(); /* take input chars one at a time, no wait for \n */
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| 292 | (void) noecho(); /* don't echo input */
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| 293 | nodelay(stdscr, TRUE);
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| 294 | idlok(stdscr, TRUE); /* allow use of insert/delete line */
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| 295 |
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| 296 | if (try_color) {
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| 297 | if (has_colors()) {
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| 298 | start_color();
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| 299 | init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
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| 300 | bkgd(COLOR_PAIR(my_pair));
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| 301 | } else {
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| 302 | try_color = FALSE;
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| 303 | }
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| 304 | }
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| 305 |
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| 306 | lptr = vec_lines;
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| 307 | while (!done) {
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| 308 | int n, c;
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| 309 |
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| 310 | if (!got_number)
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| 311 | show_all(my_label);
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| 312 |
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| 313 | n = 0;
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| 314 | for (;;) {
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| 315 | #if CAN_RESIZE
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| 316 | if (interrupted) {
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| 317 | adjust(0);
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| 318 | my_label = "interrupt";
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| 319 | }
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| 320 | #endif
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| 321 | waiting = TRUE;
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| 322 | c = getch();
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| 323 | waiting = FALSE;
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| 324 | if ((c < 127) && isdigit(c)) {
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| 325 | if (!got_number) {
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| 326 | mvprintw(0, 0, "Count: ");
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| 327 | clrtoeol();
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| 328 | }
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| 329 | addch(UChar(c));
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| 330 | value = 10 * value + (c - '0');
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| 331 | got_number = TRUE;
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| 332 | } else
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| 333 | break;
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| 334 | }
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| 335 | if (got_number && value) {
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| 336 | n = value;
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| 337 | } else {
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| 338 | n = 1;
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| 339 | }
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| 340 |
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| 341 | if (c != ERR)
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| 342 | my_label = keyname(c);
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| 343 | switch (c) {
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| 344 | case KEY_DOWN:
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| 345 | case 'n':
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| 346 | olptr = lptr;
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| 347 | for (i = 0; i < n; i++)
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| 348 | if ((lptr - vec_lines) < (num_lines - LINES + 1))
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| 349 | lptr++;
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| 350 | else
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| 351 | break;
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| 352 | wscrl(stdscr, lptr - olptr);
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| 353 | break;
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| 354 |
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| 355 | case KEY_UP:
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| 356 | case 'p':
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| 357 | olptr = lptr;
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| 358 | for (i = 0; i < n; i++)
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| 359 | if (lptr > vec_lines)
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| 360 | lptr--;
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| 361 | else
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| 362 | break;
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| 363 | wscrl(stdscr, lptr - olptr);
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| 364 | break;
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| 365 |
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| 366 | case 'h':
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| 367 | case KEY_HOME:
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| 368 | lptr = vec_lines;
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| 369 | break;
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| 370 |
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| 371 | case 'e':
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| 372 | case KEY_END:
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| 373 | if (num_lines > LINES)
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| 374 | lptr = vec_lines + num_lines - LINES + 1;
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| 375 | else
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| 376 | lptr = vec_lines;
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| 377 | break;
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| 378 |
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| 379 | case 'r':
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| 380 | case KEY_RIGHT:
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| 381 | shift += n;
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| 382 | break;
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| 383 |
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| 384 | case 'l':
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| 385 | case KEY_LEFT:
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|---|
| 386 | shift -= n;
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| 387 | if (shift < 0) {
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| 388 | shift = 0;
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|---|
| 389 | beep();
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|---|
| 390 | }
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|---|
| 391 | break;
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|---|
| 392 |
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|---|
| 393 | case 'q':
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|---|
| 394 | done = TRUE;
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|---|
| 395 | break;
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| 396 |
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| 397 | #ifdef KEY_RESIZE
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|---|
| 398 | case KEY_RESIZE: /* ignore this; ncurses will repaint */
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|---|
| 399 | break;
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|---|
| 400 | #endif
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|---|
| 401 | case 's':
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|---|
| 402 | if (got_number) {
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|---|
| 403 | halfdelay(my_delay = n);
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|---|
| 404 | } else {
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|---|
| 405 | nodelay(stdscr, FALSE);
|
|---|
| 406 | my_delay = -1;
|
|---|
| 407 | }
|
|---|
| 408 | break;
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|---|
| 409 | case ' ':
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|---|
| 410 | nodelay(stdscr, TRUE);
|
|---|
| 411 | my_delay = 0;
|
|---|
| 412 | break;
|
|---|
| 413 | case ERR:
|
|---|
| 414 | if (!my_delay)
|
|---|
| 415 | napms(50);
|
|---|
| 416 | break;
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|---|
| 417 | default:
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|---|
| 418 | beep();
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|---|
| 419 | break;
|
|---|
| 420 | }
|
|---|
| 421 | if (c >= KEY_MIN || (c > 0 && !isdigit(c))) {
|
|---|
| 422 | got_number = FALSE;
|
|---|
| 423 | value = 0;
|
|---|
| 424 | }
|
|---|
| 425 | }
|
|---|
| 426 |
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|---|
| 427 | finish(0); /* we're done */
|
|---|
| 428 | }
|
|---|
| 429 |
|
|---|
| 430 | static RETSIGTYPE
|
|---|
| 431 | finish(int sig)
|
|---|
| 432 | {
|
|---|
| 433 | endwin();
|
|---|
| 434 | #if NO_LEAKS
|
|---|
| 435 | if (vec_lines != 0) {
|
|---|
| 436 | int n;
|
|---|
| 437 | for (n = 0; n < num_lines; ++n) {
|
|---|
| 438 | free(vec_lines[n]);
|
|---|
| 439 | }
|
|---|
| 440 | free(vec_lines);
|
|---|
| 441 | }
|
|---|
| 442 | #endif
|
|---|
| 443 | ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
|
|---|
| 444 | }
|
|---|
| 445 |
|
|---|
| 446 | #if CAN_RESIZE
|
|---|
| 447 | /*
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| 448 | * This uses functions that are "unsafe", but it seems to work on SunOS and
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| 449 | * Linux. Usually: the "unsafe" refers to the functions that POSIX lists
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| 450 | * which may be called from a signal handler. Those do not include buffered
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| 451 | * I/O, which is used for instance in wrefresh(). To be really portable, you
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| 452 | * should use the KEY_RESIZE return (which relies on ncurses' sigwinch
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| 453 | * handler).
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| 454 | *
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| 455 | * The 'wrefresh(curscr)' is needed to force the refresh to start from the top
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| 456 | * of the screen -- some xterms mangle the bitmap while resizing.
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| 457 | */
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| 458 | static RETSIGTYPE
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| 459 | adjust(int sig)
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| 460 | {
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| 461 | if (waiting || sig == 0) {
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| 462 | struct winsize size;
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| 463 |
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| 464 | if (ioctl(fileno(stdout), TIOCGWINSZ, &size) == 0) {
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| 465 | resize_term(size.ws_row, size.ws_col);
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| 466 | wrefresh(curscr); /* Linux needs this */
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| 467 | show_all(sig ? "SIGWINCH" : "interrupt");
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| 468 | }
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| 469 | interrupted = FALSE;
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| 470 | } else {
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| 471 | interrupted = TRUE;
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| 472 | }
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| 473 | (void) signal(SIGWINCH, adjust); /* some systems need this */
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| 474 | }
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| 475 | #endif /* CAN_RESIZE */
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| 476 |
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| 477 | static void
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| 478 | show_all(const char *tag)
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| 479 | {
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| 480 | int i;
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| 481 | char temp[BUFSIZ];
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| 482 | NCURSES_CH_T *s;
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| 483 | time_t this_time;
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| 484 |
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| 485 | #if CAN_RESIZE
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| 486 | sprintf(temp, "%s (%3dx%3d) col %d ", tag, LINES, COLS, shift);
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| 487 | i = strlen(temp);
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| 488 | sprintf(temp + i, "view %.*s", (int) (sizeof(temp) - 7 - i), fname);
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| 489 | #else
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| 490 | sprintf(temp, "view %.*s", (int) sizeof(temp) - 7, fname);
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| 491 | #endif
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| 492 | move(0, 0);
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| 493 | printw("%.*s", COLS, temp);
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| 494 | clrtoeol();
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| 495 | this_time = time((time_t *) 0);
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| 496 | strcpy(temp, ctime(&this_time));
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| 497 | if ((i = strlen(temp)) != 0) {
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| 498 | temp[--i] = 0;
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| 499 | if (move(0, COLS - i - 2) != ERR)
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| 500 | printw(" %s", temp);
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|---|
| 501 | }
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|---|
| 502 |
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|---|
| 503 | scrollok(stdscr, FALSE); /* prevent screen from moving */
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|---|
| 504 | for (i = 1; i < LINES; i++) {
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|---|
| 505 | move(i, 0);
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|---|
| 506 | printw("%3ld:", (long) (lptr + i - vec_lines));
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|---|
| 507 | clrtoeol();
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|---|
| 508 | if ((s = lptr[i - 1]) != 0) {
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|---|
| 509 | int len = ch_len(s);
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|---|
| 510 | if (len > shift) {
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|---|
| 511 | #if USE_WIDEC_SUPPORT
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|---|
| 512 | add_wchstr(s + shift);
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|---|
| 513 | #else
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|---|
| 514 | addchstr(s + shift);
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|---|
| 515 | #endif
|
|---|
| 516 | }
|
|---|
| 517 | #if defined(NCURSES_VERSION) || defined(HAVE_WCHGAT)
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|---|
| 518 | if (try_color)
|
|---|
| 519 | wchgat(stdscr, -1, A_NORMAL, my_pair, NULL);
|
|---|
| 520 | #endif
|
|---|
| 521 | }
|
|---|
| 522 | }
|
|---|
| 523 | setscrreg(1, LINES - 1);
|
|---|
| 524 | scrollok(stdscr, TRUE);
|
|---|
| 525 | refresh();
|
|---|
| 526 | }
|
|---|
