read text file, convert character numbers to int?

Hi!
I wrote a small code, that reads contents of the file and puts it into multidimensional array. This is the file:

Code:

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1:Name1:43
2:Name2:84
3:Name3:53
4:Name4:14
5:Name5:12
6:Name6:63
7:Name7:41
8:Name8:31
9:Name9:51
10:Name10:17

---

I have two problems:

1. I need to separate each line into 3 variables, the separation character is :. for example I read the line and put values(1, Name1, 43) in 3 different variables. I need something like php explode(); function, but I guess I'll have to write it by myself.. Maybe I could use somehow fscanf to acomplish this?

2. I have no problem reading the first character on each line and casting it as an int, so I could use it's value for adding or dividing, but when I read the last line, it's 10, that take 2 blocks in my array, how can I cast them as an integer!?

Code:

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#include <stdlib.h>
#include <stdio.h>


int main() {
  char c[60000]; 
  int data[10][400], line_pos=0, nline=0, i=0, ch;
       
  FILE *fd;
  fd = fopen("file", "r");

        memset(data, 0, sizeof(data));

        while((ch=getc(fd)) != EOF){
                data[nline][line_pos] = ch;
                line_pos++;

                if(ch == 0x0a){
                        line_pos=0;
                        nline++;
                }               
        }

       

    fclose(fd);
    return 0;

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Basicly I need to read the first and the last variable from each line of the file and put them into int variable, any suggestions please? thank you!

If you _want_ to use scanf, you _could_ do

Code:

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fscanf(fileptr, "%i:%<BUF_LEN>^[:]:%i\n", &<int0>, <char *>, &<int1>);

---

However, you'll need to do some error checking and watch for the EOF somewhere else.

Thanks!
The problem is that I don't know the length of the second variable, so I won't be able to tell fscanf(); the length. Is it posible to just skip the second variable? for example:

Code:

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fscanf(fileptr, "%i::%i\n", &<int0>, &<int1>);

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or fscanf cannot do this!? because actualy the file is a spreadsheet and it contains 13 fields, but I don't need all of them, I need just specific fields that I can use as int.

Step 1 - read each line
fgets( buff, sizeof buff, fileptr );

Step 2 - parse the buffer

Code:

---

char buff[BUFSIZ];
while ( fgets( buff, sizeof buff, fileptr ) != NULL ) {
  if ( sscanf( buff, "%d:%[^:]:%d", &num1, name, &num2 ) == 3 ) {
    // success
  } else {
    // error
  }
}

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Thank you both, that worked!:

Code:

---

#include <stdlib.h>
#include <stdio.h>


int main() {

  FILE *fd;
  fd = fopen("file", "r");


int num1, num2, err_n;
char name[100], buff[6000];

while (fgets( buff, sizeof buff, fd ) != NULL) {

        err_n = sscanf( buff, "%d:%[^:]:%d", &num1, name, &num2 );
       
        if ( err_n == 3 ) {
                printf("%d %s %d\n", num1, name, num2);
        } else {
                printf("ERROR: %i\n\n", err_n);
        }
}       

    fclose(fd);
    return 0;
 
}

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Might be useful to someone: Analyzing Strings with sscanf

Quote:

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Originally Posted by Salem

Code:

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char buff[BUFSIZ];
while ( fgets( buff, sizeof buff, fileptr ) != NULL ) {
  if ( sscanf( buff, "%d:%[^:]:%d", &num1, name, &num2 ) == 3 ) {
    // success
  } else {
    // error
  }
}

---

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Wouldn't you still want to do the whole %<some num>[^:] to keep from stepping off the end of your `name`?

Probably, though making name also BUFSIZ in length, then dealing with it separately is one way of avoiding the issue.