[SOLVED] fscanf question i guess

errigour · 05-05-2022, 07:16 AM

Why doesn't this print the game time? What am I doing wrong? The last two printf lines in main do not print and when I compile it on my server I get this error:

Code:

      1 [main] a 2917 C:\cygwin64\home\Errigour\c src\web server\a.exe: *** fatal error - Internal error: TP_NUM_C_BUFS too small: 50
                                           Hangup

Also I think it is because of the fscanf in load_game_time()

Code:

#include <stdio.h>

const char *days[] = {
    "Beuth",  // Beginning truth
    "Douth",  // Doubt truth
    "Bejewl", // Believe jewel
    "Fevif",  // Forever life
    "Not"     // No hate
};

const char *months[] = {
    "Underus\0",
    "Dosendris\0",
    "Treviator\0",
    "Quatrin\0",
    "Cincalm\0",
    "Seisol\0",
    "Setten",
    "Ochace",
    "Nuavor",
    "Dieoon"
};

struct game_time {
    unsigned int second;
    unsigned int minute;
    unsigned int hour;
} gtime;

struct game_date {
    unsigned int day;
    unsigned int dayofmonth;
    unsigned int month;
    long long unsigned int year;
}gdate;

void save_game_time(){
    FILE *fp;
    if ((fp=fopen("time.db", "w")) == 0)
        perror("Error saving time.db!");
    fprintf(fp, "%u %u %u %u %u %u %llu", gtime.second, gtime.minute, gtime.hour, gdate.day, gdate.dayofmonth, gdate.month, gdate.year );
    fclose(fp);
}

void load_game_time(){
    FILE *fp;
    if ((fp=fopen("time.db", "r")) == 0)
        perror("Error loading time.db!");
    fscanf(fp, "%u %u %u %u %u %u %llu", gtime.second, gtime.minute, gtime.hour, gdate.day, gdate.dayofmonth, gdate.month, gdate.year );
    fclose(fp);
}

int main()
{
    char get[3], path[3], http[4];
    char request[]="GET tmp http\0";
    
    setbuf(stdout, NULL);
    
    sscanf(request, "%s %s %s", get, path, http);
    printf("%s\n", get);
    printf("<html lang=\"en\">\n"
                        "<title>Space</title>\n"
                        "<head>\n"
                        "</head>\n"
                        "<body>\n"
                        "A pagan says, \"Finally, Hello world!\"<br>\n"
                        "<image src=\"favicon.ico\" alt=\"favicon.ico\" height=\"25\" width=\"25\">\n"
                        "<form method=\"post\" action=\"index.html\">\n"
                        "    <label for=\"email\">Username:</label><input type=\"text\" id=\"email\" name=\"email\" value=\"\"><br>\n"
                        "    <label for=\"pass\">Password:</label><input type=\"password\" id=\"pass\" name=\"pass\" value=\"\"><br>\n"
                        "<input type=\"submit\" value=\"Login\\Create\">\n"
                        "</form>\n"
                        "</body>\n"
                        "</html>\n\0");
    printf("Size of char: %d\n", sizeof(char));
    printf("Got here 1\n");
    save_game_time();
    load_game_time();
/* The following two lines do not print */
    printf("Got here 2\n");
    printf("%d:%d:%d on %s of %s\n", gtime.hour, gtime.minute, gtime.second, days[gdate.day], months[gdate.month]);
}

teckk · 05-05-2022, 08:24 AM

Well, this is linux forum.

I compiled that code with:

Code:

gcc test.c -o test

And I get

Code:

./test
GETtmphttp
<html lang="en">
<title>Space</title>
<head>
</head>
<body>
A pagan says, "Finally, Hello world!"<br>
<image src="favicon.ico" alt="favicon.ico" height="25" width="25">
<form method="post" action="index.html">
    <label for="email">Username:</label><input type="text" id="email" name="email" value=""><br>
    <label for="pass">Password:</label><input type="password" id="pass" name="pass" value=""><br>
<input type="submit" value="Login\Create">
</form>
</body>
</html>
Size of char: 1
Got here 1
Segmentation fault (core dumped)

teckk · 05-05-2022, 08:27 AM

Compiled it again with line 79

Code:

//load_game_time();

Code:

./test
GETtmphttp
<html lang="en">
<title>Space</title>
<head>
</head>
<body>
A pagan says, "Finally, Hello world!"<br>
<image src="favicon.ico" alt="favicon.ico" height="25" width="25">
<form method="post" action="index.html">
    <label for="email">Username:</label><input type="text" id="email" name="email" value=""><br>
    <label for="pass">Password:</label><input type="password" id="pass" name="pass" value=""><br>
<input type="submit" value="Login\Create">
</form>
</body>
</html>
Size of char: 1
Got here 1
Got here 2
0:0:0 on Beuth of Underus

NevemTeve · 05-05-2022, 09:27 AM

Code:

-   fscanf(fp, "%u %u %u %u %u %u %llu", gtime.second, gtime.minute, gtime.hour, gdate.day, gdate.dayofmonth, gdate.month, gdate.year );
+   fscanf(fp, "%u %u %u %u %u %u %llu", &gtime.second, &gtime.minute, &gtime.hour, &gdate.day, &gdate.dayofmonth, &gdate.month, &gdate.year );

errigour · 05-05-2022, 12:06 PM

Oh man thanks that fixed the problem completely.