getline.c
上传用户:zlh9724
上传日期:2007-01-04
资源大小:1991k
文件大小:2k
- /* Copyright (C) 1991 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., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
- /* CHANGED FOR VMS */
- /*
- * <getline.c>
- **
- ** HISTORY:
- ** 8 Jul 94 FM Include "HTUtils.h" for memory allocation and free()
- ** substitutions with VAXC on VMS.
- **
- */
- #include <stddef.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <errno.h>
- #include "HTUtils.h"
- /* Read up to (and including) a newline 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. */
- int getline(char **lineptr, size_t *n, FILE *stream)
- {
- static char line[256];
- char *ptr;
- unsigned int len;
- if (lineptr == NULL || n == NULL)
- {
- errno = EINVAL;
- return -1;
- }
- if (ferror (stream))
- return -1;
- if (feof(stream))
- return -1;
-
- fgets(line,256,stream);
- ptr = strchr(line,'n');
- if (ptr)
- *ptr = '';
- len = strlen(line);
-
- if ((len+1) < 256)
- {
- ptr = realloc(*lineptr, 256);
- if (ptr == NULL)
- return(-1);
- *lineptr = ptr;
- *n = 256;
- }
- strcpy(*lineptr,line);
- return(len);
- }