cscg22-gearboy

CSCG 2022 Challenge 'Gearboy'
git clone https://git.sinitax.com/sinitax/cscg22-gearboy
Log | Files | Refs | sfeed.txt

checkkeys.c (5122B)

      1/*
      2  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
      3
      4  This software is provided 'as-is', without any express or implied
      5  warranty.  In no event will the authors be held liable for any damages
      6  arising from the use of this software.
      7
      8  Permission is granted to anyone to use this software for any purpose,
      9  including commercial applications, and to alter it and redistribute it
     10  freely.
     11*/
     12
     13/* Simple program:  Loop, watching keystrokes
     14   Note that you need to call SDL_PollEvent() or SDL_WaitEvent() to
     15   pump the event loop and catch keystrokes.
     16*/
     17
     18#include <stdio.h>
     19#include <stdlib.h>
     20#include <string.h>
     21
     22#include "SDL.h"
     23
     24/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
     25static void
     26quit(int rc)
     27{
     28    SDL_Quit();
     29    exit(rc);
     30}
     31
     32static void
     33print_string(char **text, size_t *maxlen, const char *fmt, ...)
     34{
     35    int len;
     36    va_list ap;
     37
     38    va_start(ap, fmt);
     39    len = SDL_vsnprintf(*text, *maxlen, fmt, ap);
     40    if (len > 0) {
     41        *text += len;
     42        if ( ((size_t) len) < *maxlen ) {
     43            *maxlen -= (size_t) len;
     44        } else {
     45            *maxlen = 0;
     46        }
     47    }
     48    va_end(ap);
     49}
     50
     51static void
     52print_modifiers(char **text, size_t *maxlen)
     53{
     54    int mod;
     55    print_string(text, maxlen, " modifiers:");
     56    mod = SDL_GetModState();
     57    if (!mod) {
     58        print_string(text, maxlen, " (none)");
     59        return;
     60    }
     61    if (mod & KMOD_LSHIFT)
     62        print_string(text, maxlen, " LSHIFT");
     63    if (mod & KMOD_RSHIFT)
     64        print_string(text, maxlen, " RSHIFT");
     65    if (mod & KMOD_LCTRL)
     66        print_string(text, maxlen, " LCTRL");
     67    if (mod & KMOD_RCTRL)
     68        print_string(text, maxlen, " RCTRL");
     69    if (mod & KMOD_LALT)
     70        print_string(text, maxlen, " LALT");
     71    if (mod & KMOD_RALT)
     72        print_string(text, maxlen, " RALT");
     73    if (mod & KMOD_LGUI)
     74        print_string(text, maxlen, " LGUI");
     75    if (mod & KMOD_RGUI)
     76        print_string(text, maxlen, " RGUI");
     77    if (mod & KMOD_NUM)
     78        print_string(text, maxlen, " NUM");
     79    if (mod & KMOD_CAPS)
     80        print_string(text, maxlen, " CAPS");
     81    if (mod & KMOD_MODE)
     82        print_string(text, maxlen, " MODE");
     83}
     84
     85static void
     86PrintKey(SDL_Keysym * sym, SDL_bool pressed, SDL_bool repeat)
     87{
     88    char message[512];
     89    char *spot;
     90    size_t left;
     91
     92    spot = message;
     93    left = sizeof(message);
     94
     95    /* Print the keycode, name and state */
     96    if (sym->sym) {
     97        print_string(&spot, &left,
     98                "Key %s:  scancode %d = %s, keycode 0x%08X = %s ",
     99                pressed ? "pressed " : "released",
    100                sym->scancode,
    101                SDL_GetScancodeName(sym->scancode),
    102                sym->sym, SDL_GetKeyName(sym->sym));
    103    } else {
    104        print_string(&spot, &left,
    105                "Unknown Key (scancode %d = %s) %s ",
    106                sym->scancode,
    107                SDL_GetScancodeName(sym->scancode),
    108                pressed ? "pressed " : "released");
    109    }
    110    print_modifiers(&spot, &left);
    111    if (repeat) {
    112        print_string(&spot, &left, " (repeat)");
    113    }
    114    SDL_Log("%s\n", message);
    115}
    116
    117static void
    118PrintText(char *text)
    119{
    120    char *spot, expanded[1024];
    121
    122    expanded[0] = '\0';
    123    for ( spot = text; *spot; ++spot )
    124    {
    125        size_t length = SDL_strlen(expanded);
    126        SDL_snprintf(expanded + length, sizeof(expanded) - length, "\\x%.2x", (unsigned char)*spot);
    127    }
    128    SDL_Log("Text (%s): \"%s%s\"\n", expanded, *text == '"' ? "\\" : "", text);
    129}
    130
    131int
    132main(int argc, char *argv[])
    133{
    134    SDL_Window *window;
    135    SDL_Event event;
    136    int done;
    137	
    138	/* Enable standard application logging */
    139	SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
    140
    141    /* Initialize SDL */
    142    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
    143		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
    144        return (1);
    145    }
    146
    147    /* Set 640x480 video mode */
    148    window = SDL_CreateWindow("CheckKeys Test",
    149                              SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
    150                              640, 480, 0);
    151    if (!window) {
    152        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create 640x480 window: %s\n",
    153                SDL_GetError());
    154        quit(2);
    155    }
    156
    157#if __IPHONEOS__
    158    /* Creating the context creates the view, which we need to show keyboard */
    159    SDL_GL_CreateContext(window);
    160#endif
    161
    162    SDL_StartTextInput();
    163
    164    /* Watch keystrokes */
    165    done = 0;
    166    while (!done) {
    167        /* Check for events */
    168        SDL_WaitEvent(&event);
    169        switch (event.type) {
    170        case SDL_KEYDOWN:
    171        case SDL_KEYUP:
    172			PrintKey(&event.key.keysym, (event.key.state == SDL_PRESSED) ? SDL_TRUE : SDL_FALSE, (event.key.repeat) ? SDL_TRUE : SDL_FALSE);
    173            break;
    174        case SDL_TEXTINPUT:
    175            PrintText(event.text.text);
    176            break;
    177        case SDL_MOUSEBUTTONDOWN:
    178            /* Any button press quits the app... */
    179        case SDL_QUIT:
    180            done = 1;
    181            break;
    182        default:
    183            break;
    184        }
    185    }
    186
    187    SDL_Quit();
    188    return (0);
    189}
    190
    191/* vi: set ts=4 sw=4 expandtab: */