| /* Copyright (C) 1991, 1992, 1995, 1996, 1997 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| The GNU C Library 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 |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with the GNU C Library; see the file COPYING.LIB. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <limits.h> |
| #include <errno.h> |
| |
| /* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR |
| (and null-terminate it). *LINEPTR is a pointer returned from malloc (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 EOF. */ |
| |
| ssize_t |
| __getdelim (lineptr, n, terminator, stream) |
| char **lineptr; |
| size_t *n; |
| int terminator; |
| FILE *stream; |
| { |
| char *line, *p; |
| size_t size, copy; |
| |
| if (!__validfp (stream) || lineptr == NULL || n == NULL) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| |
| if (ferror (stream)) |
| return -1; |
| |
| /* Make sure we have a line buffer to start with. */ |
| if (*lineptr == NULL || *n < 2) /* !seen and no buf yet need 2 chars. */ |
| { |
| #ifndef MAX_CANON |
| #define MAX_CANON 256 |
| #endif |
| line = realloc (*lineptr, MAX_CANON); |
| if (line == NULL) |
| return -1; |
| *lineptr = line; |
| *n = MAX_CANON; |
| } |
| |
| line = *lineptr; |
| size = *n; |
| |
| copy = size; |
| p = line; |
| |
| if (stream->__buffer == NULL && stream->__userbuf) |
| { |
| /* Unbuffered stream. Not much optimization to do. */ |
| |
| while (1) |
| { |
| size_t len; |
| |
| while (--copy > 0) |
| { |
| register int c = getc (stream); |
| if (c == EOF) |
| goto lose; |
| else if ((*p++ = c) == terminator) |
| goto win; |
| } |
| |
| /* Need to enlarge the line buffer. */ |
| len = p - line; |
| size *= 2; |
| line = realloc (line, size); |
| if (line == NULL) |
| goto lose; |
| *lineptr = line; |
| *n = size; |
| p = line + len; |
| copy = size - len; |
| } |
| } |
| else |
| { |
| /* Leave space for the terminating null. */ |
| --copy; |
| |
| if (!stream->__seen || stream->__buffer == NULL || stream->__pushed_back) |
| { |
| /* Do one with getc to allocate a buffer. */ |
| int c = getc (stream); |
| if (c == EOF) |
| goto lose; |
| *p++ = c; |
| if (c == terminator) |
| goto win; |
| --copy; |
| } |
| |
| while (1) |
| { |
| size_t i; |
| char *found; |
| |
| i = stream->__get_limit - stream->__bufp; |
| if (i == 0) |
| { |
| /* Refill the buffer. */ |
| int c = __fillbf (stream); |
| if (c == EOF) |
| goto lose; |
| *p++ = c; |
| if (c == terminator) |
| goto win; |
| --copy; |
| i = stream->__get_limit - stream->__bufp; |
| } |
| |
| if (i > copy) |
| i = copy; |
| |
| found = (char *) __memccpy ((void *) p, stream->__bufp, |
| terminator, i); |
| if (found != NULL) |
| { |
| stream->__bufp += found - p; |
| p = found; |
| goto win; |
| } |
| |
| stream->__bufp += i; |
| p += i; |
| copy -= i; |
| if (copy == 0) |
| { |
| /* Need to enlarge the line buffer. */ |
| size_t len = p - line; |
| size *= 2; |
| line = realloc (line, size); |
| if (line == NULL) |
| goto lose; |
| *lineptr = line; |
| *n = size; |
| p = line + len; |
| copy = size - len; |
| /* Leave space for the terminating null. */ |
| --copy; |
| } |
| } |
| } |
| |
| lose: |
| if (p == *lineptr) |
| return -1; |
| /* Return a partial line since we got an error in the middle. */ |
| win: |
| *p = '\0'; |
| return p - *lineptr; |
| } |
| |
| weak_alias (__getdelim, getdelim) |