1 /* getline.c -- Replacement for GNU C library function getline
3 Copyright (C) 1993 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
19 /* Written by Jan Brittenson, bson@gnu.ai.mit.edu. */
25 #include <sys/types.h>
32 char *malloc (), *realloc ();
35 /* Always add at least this many bytes when extending the buffer. */
38 /* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR
39 + OFFSET (and null-terminate it). *LINEPTR is a pointer returned from
40 malloc (or NULL), pointing to *N characters of space. It is realloc'd
41 as necessary. Return the number of characters read (not including the
42 null terminator), or -1 on error or EOF. */
45 getstr (lineptr, n, stream, terminator, offset)
52 int nchars_avail; /* Allocated but unused chars in *LINEPTR. */
53 char *read_pos; /* Where we're reading into *LINEPTR. */
56 if (!lineptr || !n || !stream)
62 *lineptr = malloc (*n);
67 nchars_avail = *n - offset;
68 read_pos = *lineptr + offset;
72 register int c = getc (stream);
74 /* We always want at least one char left in the buffer, since we
75 always (unless we get an error while reading the first char)
76 NUL-terminate the line buffer. */
78 assert((*lineptr + *n) == (read_pos + nchars_avail));
86 nchars_avail = *n + *lineptr - read_pos;
87 *lineptr = realloc (*lineptr, *n);
90 read_pos = *n - nchars_avail + *lineptr;
91 assert((*lineptr + *n) == (read_pos + nchars_avail));
94 if (c == EOF || ferror (stream))
96 /* Return partial line, if any. */
97 if (read_pos == *lineptr)
107 /* Return the line. */
111 /* Done - NUL terminate and return the number of chars read. */
114 ret = read_pos - (*lineptr + offset);
119 getline (lineptr, n, stream)
124 return getstr (lineptr, n, stream, '\n', 0);