C - How can I copy one string into an element of character arrays?

Question

I'm trying to parse a file and have an array of character pointers whose length is the number of lines in the file. I want to copy each line into an element of this array, but keep getting a segmentation fault. I don't see what I'm doing wrong, so if anybody could help it would be greatly appreciated. Here is my code.

char * unsplitLines[numLines];
char line[20];
int i;
for(i = 0; i < lines; i++)
{
    fgets(line, 20, fp);
    //printf("%s
", line);
    unsplitLines[i] = line;
}

The gets function works fine, but the assignment after it causes the segmentation fault.

Answer 1

fgets do not allocate buffer for you, so all the elements in unsplitLines store same pointer line and its content is the end line of file.

try asprintf

char * unsplitLines[numLines];
char line[20];
int i;
for(i = 0; i < lines; i++)
{
    fgets(line, 20, fp);
    asprintf(unsplitLines[i], "%s", line);
}