Reading each line of a file into an array

Question

I am reading a file and want to put each line in a line in an array. The file length is arbitrary, and the length of each line is arbitrary (although it is assumed that it will be less than 100 characters).

Here is what I have and it does not compile. In essence, this is an array of an array of characters, isn't it? So it should not be char** words = (**char)malloc(sizeof(*char));?

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

int main(){


 int BUFSIZE = 32767;//max number of lines to read
 char** words = (**char)malloc(sizeof(*char));//gives error: expected expression before 'char'
 FILE *fp = fopen("coll.txt", "r");
 if (fp == 0){
        fprintf(stderr, "Error opening file");
        exit(1);
 }

int i = 0;
words[i] = malloc(BUFSIZE);
while(fscanf(fp, "%100s", words[i]) == 1)//no line will be longer than 100
{
        i++;
        words[i] = realloc(words, sizeof(char*)*i);
 }

 int j;
 for(j = 0; j < i; j++)
    printf("%s\n", words);

 return 0;
}

Note. I read " Reading from a file and saving to an array ", but it does not answer my question.

Answer 1

. realloc() . fgets() . . realloc(), , , ( ). , , .

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

int main(void)

    {
    int lines_allocated = 128;
    int max_line_len = 100;

    /* Allocate lines of text */
    char **words = (char **)malloc(sizeof(char*)*lines_allocated);
    if (words==NULL)
        {
        fprintf(stderr,"Out of memory (1).\n");
        exit(1);
        }

    FILE *fp = fopen("coll.txt", "r");
    if (fp == NULL)
        {
        fprintf(stderr,"Error opening file.\n");
        exit(2);
        }

    int i;
    for (i=0;1;i++)
        {
        int j;

        /* Have we gone over our line allocation? */
        if (i >= lines_allocated)
            {
            int new_size;

            /* Double our allocation and re-allocate */
            new_size = lines_allocated*2;
            words = (char **)realloc(words,sizeof(char*)*new_size);
            if (words==NULL)
                {
                fprintf(stderr,"Out of memory.\n");
                exit(3);
                }
            lines_allocated = new_size;
            }
        /* Allocate space for the next line */
        words[i] = malloc(max_line_len);
        if (words[i]==NULL)
            {
            fprintf(stderr,"Out of memory (3).\n");
            exit(4);
            }
        if (fgets(words[i],max_line_len-1,fp)==NULL)
            break;

        /* Get rid of CR or LF at end of line */
        for (j=strlen(words[i])-1;j>=0 && (words[i][j]=='\n' || words[i][j]=='\r');j--)
            ;
        words[i][j+1]='\0';
        }
    /* Close file */
    fclose(fp);

    int j;
    for(j = 0; j < i; j++)
        printf("%s\n", words[j]);

    /* Good practice to free memory */
    for (;i>=0;i--)
        free(words[i]);
    free(words);
    return 0;
    }

Answer 2

:

char** words = (**char)malloc(sizeof(*char));

:

char** words=(char **)malloc(sizeof(char *)*Max_Lines);