helpline.c

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// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>

#include "../../util/debug.h"
#include "../helpline.h"
#include "../ui.h"
#include "../libslang.h"

char ui_helpline__last_msg[1024];
bool tui_helpline__set;

static void tui_helpline__pop(void)
{
}

static void tui_helpline__push(const char *msg)
{
    const size_t sz = sizeof(ui_helpline__current);

    SLsmg_gotorc(SLtt_Screen_Rows - 1, 0);
    SLsmg_set_color(0);
    SLsmg_write_nstring((char *)msg, SLtt_Screen_Cols);
    SLsmg_refresh();
    strncpy(ui_helpline__current, msg, sz)[sz - 1] = '\0';
}

static int tui_helpline__show(const char *format, va_list ap)
{
    int ret;
    static int backlog;

    pthread_mutex_lock(&ui__lock);
    ret = vscnprintf(ui_helpline__last_msg + backlog,
            sizeof(ui_helpline__last_msg) - backlog, format, ap);
    backlog += ret;

    tui_helpline__set = true;

    if (ui_helpline__last_msg[backlog - 1] == '\n') {
        ui_helpline__puts(ui_helpline__last_msg);
        SLsmg_refresh();
        backlog = 0;
    }
    pthread_mutex_unlock(&ui__lock);

    return ret;
}

struct ui_helpline tui_helpline_fns = {
    .pop    = tui_helpline__pop,
    .push   = tui_helpline__push,
    .show   = tui_helpline__show,
};

void ui_helpline__init(void)
{
    helpline_fns = &tui_helpline_fns;
    ui_helpline__puts(" ");
}