C:如何从文件中读取可变数量的信息并将其存储在数组中

Question

我不习惯用c编程，所以我想知道如何有一个数组，然后读取一个文件中的可变数量的变量，以及数组中的那些文件。

//how do I declare an array whose sizes varies
do {
     char buffer[1000];
     fscanf(file, %[^\n]\n", buffer);
     //how do i add buffer to array
}while(!feof(file)); 

Answer 1

int nlines = 0
char **lines = NULL; /* Array of resulting lines */
int curline = 0;
char buffer[BUFSIZ]; /* Just alloocate this once, not each time through the loop */
do {
     if (fgets(buffer, sizeof buffer, file)) { /* fgets() is the easy way to read a line */
       if (curline >= nlines) { /* Have we filled up the result array? */
         nlines += 1000; /* Increase size by 1,000 */
         lines = realloc(lines, nlines*sizeof(*lines); /* And grow the array */
       }
       lines[curline] = strdup(buffer); /* Make a copy of the input line and add it to the array */
       curline++;
     }
}while(!feof(file));