Function readfile

src/bin/initdb/initdb.c:473–512

* get the lines from a text file */

 * get the lines from a text file
 */
static char **
readfile(const char *path)
{
	char	  **result;
	FILE	   *infile;
	StringInfoData line;
	int			maxlines;
	int			n;

	if ((infile = fopen(path, "r")) == NULL)
	{
		pg_log_error("could not open file \"%s\" for reading: %m", path);
		exit(1);
	}

	initStringInfo(&line);

	maxlines = 1024;
	result = (char **) pg_malloc(maxlines * sizeof(char *));

	n = 0;
	while (pg_get_line_buf(infile, &line))
	{
		/* make sure there will be room for a trailing NULL pointer */
		if (n >= maxlines - 1)
		{
			maxlines *= 2;
			result = (char **) pg_realloc(result, maxlines * sizeof(char *));
		}

		result[n++] = pg_strdup(line.data);
	}
	result[n] = NULL;

	pfree(line.data);

	fclose(infile);

	return result;
}

/*
 * write an array of lines to a file