Function test_stdio

test/regtest/patch.cpp:758–875

}

void test_stdio(intptr_t arg)
{
    fprintf(stderr, "arg = 0x%llx\n", arg);
    
    fprintf(stderr, "[0]\n");
    FILE *stream = fopen("test.tmp", "w");
    if (stream == NULL)
        fprintf(stderr, "stream is NULL\n");
    int n = fprintf(stream, "%s %10d %zd -%#lx %p\n%u\t%4hu\t \t%c 0%o\n",
        "aaa", 101, arg, arg, (void *)arg, (unsigned)arg, (uint16_t)arg,
        (char)arg, 0644);
    fprintf(stderr, "pos = %zd vs %d\n", ftell(stream), n);
    const char HELLO[] = "Hello World!";
    int r = fwrite(HELLO, sizeof(char), sizeof(HELLO)-1, stream);
    fprintf(stderr, "write = %d\n", r);
    fseek(stream, 1, SEEK_SET);
    fprintf(stderr, "getc() = %d\n", getc(stream));
    fputs("bbb", stream);
    fclose(stream);

    fprintf(stderr, "[1]\n");
    stream = fopen("test.tmp", "r");
    if (stream == NULL)
        fprintf(stderr, "stream is NULL\n");
    fseek(stream, 4, SEEK_CUR);
    fprintf(stderr, "pos = %zd\n", ftell(stream));
    int i, j;
    fscanf(stream, "%d", &i);
    fprintf(stderr, "i = %d\n", i);
    fseek(stream, 0, SEEK_SET);
    getc(stream);
    fprintf(stderr, "pos = %zd\n", ftell(stream));
    ungetc('X', stream);
    fprintf(stderr, "pos = %zd\n", ftell(stream));
    char s[5];
    fscanf(stream, " %5s", s);
    fprintf(stderr, "s = \"%s\"\n", s);
    char c1, c2, c3, c4;
    s[2] = toupper(s[2]);
    sscanf(s, "%c%c%c%c", &c1, &c2, &c3, &c4);
    fprintf(stderr, "s = \"%c%c%c%c\"\n", c1, c2, c3, c4);
    fclose(stream);

    fprintf(stderr, "[2]\n");
    stream = fopen("test.tmp", "r+");
    if (stream == NULL)
        fprintf(stderr, "stream is NULL\n");
    char buf[5];
    if (setvbuf(stream, buf, _IOLBF, sizeof(buf)) < 0)
        fprintf(stderr, "setvbuf failed (%s)\n", strerror(errno));
    fputs("cccc  ", stream);
    fprintf(stderr, "c = '%c'\n", getc(stream));
    ungetc('7', stream);
    intptr_t x, y;
    void *p;
    unsigned u;
    uint16_t h;
    char c;