TTF_RenderText_Solid 导致 SIGBUS

Question

我有这段代码，它应该使用 SDL2_ttf 加载字体并在屏幕上绘制文本：

结构声明：

typedef struct {
    SDL_Window* win;
    SDL_Event* e;

    SDL_Renderer* renderer;
} SL_Window;

typedef struct {
    TTF_Font* font;
    char* file;
    size_t size;
} SL_Font;

typedef struct {
    SL_Font* font;
    char* text;
    SDL_Renderer* renderer;
    SDL_Texture* texture;

    SDL_Rect rect;

    SDL_Color color;
} SL_Text;

文字渲染header:

SL_Font* SL_loadFont(const char* file, int size) {
    SL_Font* font = (SL_Font*)SL_malloc(sizeof(SL_Font));

    font->font = TTF_OpenFont(file, size);
    if (!font->font) {
        SL_log(SL_LOG_ERROR, "Error loading font \"%s\": %s", file, TTF_GetError());
        SL_free(font);
        return NULL;
    }

    size_t __size = strlen(file) + 1;

    font->file = (char*)malloc(__size);
    strncpy(font->file, file, __size);
}
SL_Text* SL_createText(SL_Window* window, SL_Font* font) {
    SL_Text* text = (SL_Text*)SL_malloc(sizeof(SL_Text));
    text->font = font;
    text->renderer = window->renderer;

    text->texture = NULL;

    text->color.r = 0;
    text->color.g = 0;
    text->color.b = 0;
    text->color.a = 255;

    text->rect.x = 0;
    text->rect.y = 0;
    text->rect.w = 1000;
    text->rect.h = 1000;
}

void SL_setTextString(SL_Text* text, const char* string) {
    size_t __size = strlen(string) + 1;
    text->text = (char*)SL_malloc(__size);

    strncpy(text->text, string, __size);

    SDL_Surface* surface = TTF_RenderText_Solid(text->font->font, text->text, text->color);

    if (text->texture) SDL_DestroyTexture(text->texture);
    text->texture = SDL_CreateTextureFromSurface(text->renderer, surface);
    SDL_FreeSurface(surface);
}

void SL_windowDrawText(SL_Window* window, SL_Text* text) {
    SDL_RenderCopy(window->renderer, text->texture, NULL, &text->rect);
}

...

和主要的：

...
SL_Font* font = SL_loadFont("res/test_font.ttf", 24);
if (!font) return -1;
SL_Text* text = SL_createText(window, font);
SL_setTextString(text, "test text");
...

但是每当我尝试调用 SL_setTextString(SL_Text* text, const char* string) 函数时它都会给我 SIGBUS。它出现在行 SDL_Surface* surface = TTF_RenderText_Solid(text->font->font, text->text, text->color).

GDB 回溯：

#0  0x00007ffff7fa0139 in  () at /lib/x86_64-linux-gnu/libSDL2_ttf-2.0.so.0
#1  0x00007ffff7fa0c4f in TTF_RenderUTF8_Solid () at /lib/x86_64-linux-gnu/libSDL2_ttf-2.0.so.0
#2  0x00007ffff7fa0fd9 in TTF_RenderText_Solid () at /lib/x86_64-linux-gnu/libSDL2_ttf-2.0.so.0
#3  0x000055555555711b in SL_setTextString (text=0x555555a52460, string=0x555555559082 "test text") at CGraphics.c:65
#4  0x0000555555556834 in main (argc=1, argv=0x7fffffffde78) at SLE_shapes.c:23

顺便说一下，如果能列出常见的 SIGBUS 原因，我们将不胜感激。

Answer 1

正如@keltar所说，我的问题再次是由于我的注意力不集中以及C处理变量的方式造成的，没有正确初始化的变量可以有绝对随机的值，这意味着未设置的指针也不一定是NULL .

TTF_RenderText_Solid 导致 SIGBUS

TTF_RenderText_Solid causes SIGBUS

c

linux

sdl

sigbus

sdl-ttf