helpline.c

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

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

char ui_helpline__current[512];

static void nop_helpline__pop(void)
{
}

static void nop_helpline__push(const char *msg __maybe_unused)
{
}

static int nop_helpline__show(const char *fmt __maybe_unused,
                   va_list ap __maybe_unused)
{
    return 0;
}

static struct ui_helpline default_helpline_fns = {
    .pop    = nop_helpline__pop,
    .push   = nop_helpline__push,
    .show   = nop_helpline__show,
};

struct ui_helpline *helpline_fns = &default_helpline_fns;

void ui_helpline__pop(void)
{
    helpline_fns->pop();
}

void ui_helpline__push(const char *msg)
{
    helpline_fns->push(msg);
}

void ui_helpline__vpush(const char *fmt, va_list ap)
{
    char *s;

    if (vasprintf(&s, fmt, ap) < 0)
        vfprintf(stderr, fmt, ap);
    else {
        ui_helpline__push(s);
        free(s);
    }
}

void ui_helpline__fpush(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    ui_helpline__vpush(fmt, ap);
    va_end(ap);
}

void ui_helpline__puts(const char *msg)
{
    ui_helpline__pop();
    ui_helpline__push(msg);
}

int ui_helpline__vshow(const char *fmt, va_list ap)
{
    return helpline_fns->show(fmt, ap);
}

void ui_helpline__printf(const char *fmt, ...)
{
    va_list ap;

    ui_helpline__pop();
    va_start(ap, fmt);
    ui_helpline__vpush(fmt, ap);
    va_end(ap);
}