Reading from a file line by line and word by word in C-CodePudding

I have to read from a file and store the data in a structure.(You can see the structure below) Each line consists of 5 integers and 1 char variable. Each line must be an index of the "structure line".

struct line {
    int lineno;
    int x1;
    int y1;
    int x2;
    int y2;
    char color;
    int next;
};

struct line memorybuffer[25];

For example in this file:

1 10 10 50 60 R
3 80 10 10 10 B
4 40 20 40 0 Y

I should get:

memorybuffer[0].lineno = 1;
memorybuffer[0].x1 = 10;
memorybuffer[1].lineno = 3;

I could not find how can I read the data (integer char) line by line and word by word, and store it in the line structure.

Could you please help me to find the way? Thanks a lot.

CodePudding user response：

I could not find how can I read the data

Please read the man page for fscanf, which can address your needs completely.

CodePudding user response：

As hinted by Shawn you can read the file one line at a time with fgets() and parse it with sscanf():

#include <stdio.h>

struct line {
    int lineno;
    int x1;
    int y1;
    int x2;
    int y2;
    char color;
    int next;
};

struct line memorybuffer[25];

int main() {
    char line[256];
    int i;

    for (i = 0; i < 25 && fgets(line, sizeof line, stdin);) {
        if (sscanf("%d %d %d %d %d %c\n",
                   &memorybuffer[i].lineno,
                   &memorybuffer[i].x1,
                   &memorybuffer[i].y1,
                   &memorybuffer[i].x2,
                   &memorybuffer[i].y2,
                   &memorybuffer[i].color) == 6) {
            /* record was parsed correctly */
            i  ;
        } else {
            printf("invalid format: %s", line);
        }
    }
    ...
    return 0;
}