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/* Copyright (C) 1993 Hongjiu Lu
This file is part of the Linux C Library.
The Linux 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 Linux 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. */
#ifdef __linux__
#include <ansidecl.h>
#include <stdlib.h>
#include <gnu/types.h>
#if !defined(ssize_t) && !defined(_SSIZE_T)
#define _SSIZE_T
#define ssize_t __ssize_t
#endif
#endif
#include <stdio.h>
#include <string.h>
#include <errno.h>
#ifndef MAX_CANON
#define MAX_CANON 256
#endif
/* 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.
*/
#ifdef __linux__
ssize_t
DEFUN(__getline, (lineptr, n, stream),
char **lineptr AND size_t *n AND FILE *stream)
#else
__getline (char **lineptr, int *n, FILE *stream)
#endif
{
char *ptr; /* the latest section of the buffer */
char *line; /* Pointer to the buffer */
int size; /* Size of the buffer */
int count; /* # of chars in the buffer */
if (lineptr == NULL || n == NULL)
{
errno = EINVAL;
return -1;
}
if (ferror (stream))
return -1;
/* No buffer or too small, we allocate one. */
if (*lineptr == NULL || *n < 2)
{
line = (*lineptr == NULL) ?
malloc (MAX_CANON) : realloc (*lineptr, MAX_CANON);
if (line == NULL) return -1;
*lineptr = line;
*n = MAX_CANON;
}
else
{
/* Assume the buffer size is `*n'. */
line = *lineptr;
}
size = *n;
count = 0;
ptr = line;
for (;;)
{
/* We call fgets () first. For the first time, our
* buffer is *n. Next time, it is MAX_CANON chars
* longer. Count in 1 char for the last '\0'. Our
* additional buffer is MAX_CANON + 1 char long.
*/
if (fgets (ptr, (count > 0 ? MAX_CANON + 1: size), stream)
== NULL)
{
/* Check if we read in anything. */
return (count) ? count : -1;
}
/* How many chars we have read in so far. */
count += strlen (ptr);
/* If the buffer is full and we still haven't seen the
* newline, we need to expand the buffer and call
* fgets () again. Caution: there may be no newline
* at EOF. We will catch it when we call fgets () next
* time.
*/
if ((count >= size - 1) && line [count - 1] != '\n')
{
/* Expand the buffer by MAX_CANON chars. */
size += MAX_CANON;
line = realloc (line, size);
if (line == NULL) return -1;
*lineptr = line;
*n = size;
/* ptr points to the newly expanded buffer. We
* start at the previous '\0'.
*/
ptr = &line [count];
}
else break;
}
return count;
}
#if 0
void
main ()
{
char *buffer = NULL;
int len, ret;
while ((ret = __getline (&buffer, &len, stdin)) != -1)
printf ("size: %d, len: %d: %s", len, ret, buffer);
}
#endif
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