c/old/old_tty_progress.c · 2621 字节 · 下载原文

/* old_tty_progress.c —— 进度条 / 旋转动画（彩色的 tty）
 * old_tty_progress.c -- progress bar / spinner animation (color tty)
 *
 * 类别：tty
 * Category: tty
 * 兼容面：**回车 `\r` 原地重绘**（不换行、不滚屏 —— 老程序做进度条的标准手法）、
 * Compatibility: **redrawing in place with a carriage return `\r`** (no line feed, no scrolling -- the standard old-program technique for progress bars),
 *         SGR 颜色、`fflush(stdout)` 立刻出字、退格 `\b`
 *         SGR colors, `fflush(stdout)` to get the characters out immediately, and backspace `\b`
 * 出处：自写，仿 90 年代安装程序 / 压缩工具的进度显示。
 * Origin: self-written, imitating the progress displays of 1990s installers and compression tools.
 */
#include <stdio.h>
#include <vml_ui.h>     /* 只为 ui_scr_get_language() —— 老程序不该猜系统语言 */
                            /* only for ui_scr_get_language() -- an old program must not guess the system language */

#define ESC "\033"

int main(void)
{
    int i;
    int lang;   /* 界面语言：开局查一次 */
                /* UI language: queried once at start */
    char spin[4] = { '|', '/', '-', '\\' };

    lang = ui_scr_get_language();

    printf(ESC "[2J");

    /* ① 百分比进度条：`\r` 回到行首，整行重画 */
    /* 1) Percentage progress bar: `\r` returns to the start of the line and the whole line is redrawn */
    printf(lang == 0 ? "安装中：" : "Installing: ");
    for (i = 0; i <= 100; i += 5) {
        int j;
        printf(lang == 0 ? "\r" ESC "[36m安装中：[" ESC "[33m"
                         : "\r" ESC "[36mInstalling: [" ESC "[33m");
        for (j = 0; j < 20; j++) printf(j < i / 5 ? "█" : "░");
        printf(ESC "[36m] %3d%%" ESC "[0m", i);
        fflush(stdout);
    }
    printf("\n");

    /* ② 旋转光标（用 `\b` 退回一格重画）—— 老程序在"不知道进度"时就用它 */
    /* 2) Spinner (using `\b` to step back one column and redraw) -- old programs used it when "the progress is unknown" */
    printf(lang == 0 ? "处理中：" : "Working: ");
    for (i = 0; i < 12; i++) {
        printf("%c\b", spin[i % 4]);
        fflush(stdout);
    }
    printf(lang == 0 ? "完成\n" : "Done\n");

    /* ③ 反白高亮当前项 */
    /* 3) Highlight the current item with reverse video */
    printf(lang == 0 ? ESC "[7m当前选中" ESC "[0m / 未选中\n"
                     : ESC "[7mselected" ESC "[0m / not selected\n");
    return 0;
}