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+/* getline.c -- Replacement for GNU C library function getline
+
+Copyright (C) 1993, 1996, 2001-2002 Free Software Foundation, Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+USA. */
+
+/* Written by Jan Brittenson, bson@gnu.ai.mit.edu. */
+
+/* Specification. */
+#include "getline.h"
+
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+/* Always add at least this many bytes when extending the buffer. */
+#define MIN_CHUNK 64
+
+/* Reads up to (and including) a TERMINATOR from STREAM into *LINEPTR + OFFSET
+ (and null-terminate it). *LINEPTR is a pointer returned from new [] (or
+ NULL), pointing to *N characters of space. It is realloc'd as
+ necessary. Returns the number of characters read (not including the
+ null terminator), or -1 on error or immediate EOF.
+ NOTE: There is another getstr() function declared in <curses.h>. */
+
+static int
+getstr (char **lineptr, size_t *n, FILE *stream, char terminator, size_t offset)
+{
+ size_t nchars_avail; /* Allocated but unused chars in *LINEPTR. */
+ char *read_pos; /* Where we're reading into *LINEPTR. */
+
+ if (!lineptr || !n || !stream)
+ return -1;
+
+ if (!*lineptr)
+ {
+ *n = MIN_CHUNK;
+ *lineptr = new char[*n];
+ }
+
+ nchars_avail = *n - offset;
+ read_pos = *lineptr + offset;
+
+ for (;;)
+ {
+ register int c = getc (stream);
+
+ /* We always want at least one char left in the buffer, since we
+ always (unless we get an error while reading the first char)
+ NUL-terminate the line buffer. */
+
+ assert (*n - nchars_avail == (size_t) (read_pos - *lineptr));
+ if (nchars_avail < 2)
+ {
+ if (*n > MIN_CHUNK)
+ *n *= 2;
+ else
+ *n += MIN_CHUNK;
+
+ nchars_avail = *n + *lineptr - read_pos;
+ char *new_line = new char[*n];
+ if (*lineptr)
+ {
+ memcpy (new_line, *lineptr, read_pos - *lineptr);
+ delete[] *lineptr;
+ }
+ *lineptr = new_line;
+ read_pos = *n - nchars_avail + *lineptr;
+ assert (*n - nchars_avail == (size_t) (read_pos - *lineptr));
+ }
+
+ if (c == EOF || ferror (stream))
+ {
+ /* Return partial line, if any. */
+ if (read_pos == *lineptr)
+ return -1;
+ else
+ break;
+ }
+
+ *read_pos++ = c;
+ nchars_avail--;
+
+ if (c == terminator)
+ /* Return the line. */
+ break;
+ }
+
+ /* Done - NUL terminate and return the number of chars read. */
+ *read_pos = '\0';
+
+ return read_pos - (*lineptr + offset);
+}
+
+int
+get_line (char **lineptr, size_t *n, FILE *stream)
+{
+ return getstr (lineptr, n, stream, '\n', 0);
+}
+
+int
+get_delim (char **lineptr, size_t *n, int delimiter, FILE *stream)
+{
+ return getstr (lineptr, n, stream, delimiter, 0);
+}