1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/* getline.c -- Replacement for GNU C library function getline
Copyright (C) 1993, 1996, 1997, 1998, 2000, 2003 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by Jan Brittenson, bson@gnu.ai.mit.edu. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include "getline.h"
/* The `getdelim' function is only declared if the following symbol
is defined. */
#ifndef _GNU_SOURCE
# define _GNU_SOURCE 1
#endif
#include <stddef.h>
#include <stdio.h>
#if defined __GNU_LIBRARY__ && HAVE_GETDELIM
int
getline (char **lineptr, size_t *n, FILE *stream)
{
return getdelim (lineptr, n, '\n', stream);
}
#else /* ! have getdelim */
# if STDC_HEADERS
# include <stdlib.h>
# else
char *malloc (), *realloc ();
# endif
# include "unlocked-io.h"
/* Always add at least this many bytes when extending the buffer. */
# define MIN_CHUNK 64
/* Read up to (and including) a delimiter DELIM1 from STREAM into *LINEPTR
+ OFFSET (and NUL-terminate it). If DELIM2 is non-zero, then read up
and including the first occurrence of DELIM1 or DELIM2. *LINEPTR is
a pointer returned from malloc (or NULL), pointing to *N characters of
space. It is realloc'd as necessary. Return the number of characters
read (not including the NUL terminator), or -1 on error or EOF. */
static int
getdelim2 (char **lineptr, size_t *n, FILE *stream, int delim1, int delim2,
size_t offset)
{
size_t nchars_avail; /* Allocated but unused chars in *LINEPTR. */
char *read_pos; /* Where we're reading into *LINEPTR. */
int ret;
if (!lineptr || !n || !stream)
return -1;
if (!*lineptr)
{
*n = MIN_CHUNK;
*lineptr = malloc (*n);
if (!*lineptr)
return -1;
}
if (*n < offset)
return -1;
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. */
if (nchars_avail < 2)
{
if (*n > MIN_CHUNK)
*n *= 2;
else
*n += MIN_CHUNK;
nchars_avail = *n + *lineptr - read_pos;
*lineptr = realloc (*lineptr, *n);
if (!*lineptr)
return -1;
read_pos = *n - nchars_avail + *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 == delim1 || (delim2 && c == delim2))
/* Return the line. */
break;
}
/* Done - NUL terminate and return the number of chars read. */
*read_pos = '\0';
ret = read_pos - (*lineptr + offset);
return ret;
}
int
getline (char **lineptr, size_t *n, FILE *stream)
{
return getdelim2 (lineptr, n, stream, '\n', 0, 0);
}
int
getdelim (char **lineptr, size_t *n, int delimiter, FILE *stream)
{
return getdelim2 (lineptr, n, stream, delimiter, 0, 0);
}
#endif
|
