Thread: fgets only returns 3 characters

This doesn't seem to be specific to any file; I tried it with an ordered list and once with "blah" in a file by itself. I got a count of 3 characters each time (after noticing only 3 characters and changing the output to their number instead).

I'm sure it's something uber-simple and so would appreciate help all the more. EDIT: I get a segfault when trying to output the string- or array-length of string in readLine...

EDIT2: OK, I figured out that my array's length isn't accessible to me after all... Passing the length separately fixes the problem.

Code:

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

void readLine(char* string, FILE* stream){
    int i, length = sizeof(string);
    
    fgets(string, length, stream);
    char* last = &string[strlen(string) - 1];
    if(((int)*last) == '\n'){
        *last = 0;
    }
    return;
}

void concat(char* result, void (*callback)(char* result), char* array[]){
    int i, sum = 0, length = sizeof(array);
    for(i = 0; i < length; i++){
        sum += strlen(array[i]);
    }
    result = calloc(sum, sizeof(char));
    for(i = 0; i < length; i++){
        if(array[i]){
            strcat(result, array[i]);
        }
    }
    callback(result);
    free(result);
}

void interrupt(char* error){
    fwrite(error, strlen(error), 1, stderr);
}

int main(int argc, char* argv[]){
    if(argc < 2){
        char* error = "Error: At least one argument (a filename) must be provided.";
        fwrite(error, strlen(error), 1, stderr);
        return 1;
    }
    char mode = 'r';
    FILE* file = fopen(argv[1], &mode);
    if(!file){
        char* array[3];
        array[0] = "Error: The file \"";
        array[1] = argv[1];
        array[2] = "\" could not be opened; please check its permissions and try again.";
        char* error;
        concat(error, &interrupt, array);
        return 1;
    }
    char input[1024];
    readLine(input, file);
    printf("&#37;d", strlen(input));
    return 0;
}

Thanks!