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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 2005, 2006 Rob Landley <rob@landley.net>
* Copyright (C) 2004 Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2001 Matt Krai
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
char* FAST_FUNC bb_get_chunk_from_file(FILE *file, int *end)
{
int ch;
unsigned idx = 0;
char *linebuf = NULL;
while ((ch = getc(file)) != EOF) {
/* grow the line buffer as necessary */
if (!(idx & 0xff))
linebuf = xrealloc(linebuf, idx + 0x100);
linebuf[idx++] = (char) ch;
if (ch == '\0')
break;
if (end && ch == '\n')
break;
}
if (end)
*end = idx;
if (linebuf) {
// huh, does fgets discard prior data on error like this?
// I don't think so....
//if (ferror(file)) {
// free(linebuf);
// return NULL;
//}
linebuf = xrealloc(linebuf, idx + 1);
linebuf[idx] = '\0';
}
return linebuf;
}
/* Get line, including trailing \n if any */
char* FAST_FUNC xmalloc_fgets(FILE *file)
{
int i;
return bb_get_chunk_from_file(file, &i);
}
/* Get line. Remove trailing \n */
char* FAST_FUNC xmalloc_fgetline(FILE *file)
{
int i;
char *c = bb_get_chunk_from_file(file, &i);
if (i && c[--i] == '\n')
c[i] = '\0';
return c;
}
#if 0
/* GNUism getline() should be faster (not tested) than a loop with fgetc */
/* Get line, including trailing \n if any */
char* FAST_FUNC xmalloc_fgets(FILE *file)
{
char *res_buf = NULL;
size_t res_sz;
if (getline(&res_buf, &res_sz, file) == -1) {
free(res_buf); /* uclibc allocates a buffer even on EOF. WTF? */
res_buf = NULL;
}
//TODO: trimming to res_sz?
return res_buf;
}
/* Get line. Remove trailing \n */
char* FAST_FUNC xmalloc_fgetline(FILE *file)
{
char *res_buf = NULL;
size_t res_sz;
res_sz = getline(&res_buf, &res_sz, file);
if ((ssize_t)res_sz != -1) {
if (res_buf[res_sz - 1] == '\n')
res_buf[--res_sz] = '\0';
//TODO: trimming to res_sz?
} else {
free(res_buf); /* uclibc allocates a buffer even on EOF. WTF? */
res_buf = NULL;
}
return res_buf;
}
#endif
#if 0
/* Faster routines (~twice as fast). +170 bytes. Unused as of 2008-07.
*
* NB: they stop at NUL byte too.
* Performance is important here. Think "grep 50gigabyte_file"...
* Ironically, grep can't use it because of NUL issue.
* We sorely need C lib to provide fgets which reports size!
*
* Update:
* Actually, uclibc and glibc have it. man getline. It's GNUism,
* but very useful one (if it's as fast as this code).
* TODO:
* - currently, sed and sort use bb_get_chunk_from_file and heavily
* depend on its "stop on \n or \0" behavior, and STILL they fail
* to handle all cases with embedded NULs correctly. So:
* - audit sed and sort; convert them to getline FIRST.
* - THEN ditch bb_get_chunk_from_file, replace it with getline.
* - provide getline implementation for non-GNU systems.
*/
static char* xmalloc_fgets_internal(FILE *file, int *sizep)
{
int len;
int idx = 0;
char *linebuf = NULL;
while (1) {
char *r;
linebuf = xrealloc(linebuf, idx + 0x100);
r = fgets(&linebuf[idx], 0x100, file);
if (!r) {
/* need to terminate in case this is error
* (EOF puts NUL itself) */
linebuf[idx] = '\0';
break;
}
/* stupid. fgets knows the len, it should report it somehow */
len = strlen(&linebuf[idx]);
idx += len;
if (len != 0xff || linebuf[idx - 1] == '\n')
break;
}
*sizep = idx;
if (idx) {
/* xrealloc(linebuf, idx + 1) is up to caller */
return linebuf;
}
free(linebuf);
return NULL;
}
/* Get line, remove trailing \n */
char* FAST_FUNC xmalloc_fgetline_fast(FILE *file)
{
int sz;
char *r = xmalloc_fgets_internal(file, &sz);
if (r && r[sz - 1] == '\n')
r[--sz] = '\0';
return r; /* not xrealloc(r, sz + 1)! */
}
char* FAST_FUNC xmalloc_fgets(FILE *file)
{
int sz;
return xmalloc_fgets_internal(file, &sz);
}
/* Get line, remove trailing \n */
char* FAST_FUNC xmalloc_fgetline(FILE *file)
{
int sz;
char *r = xmalloc_fgets_internal(file, &sz);
if (!r)
return r;
if (r[sz - 1] == '\n')
r[--sz] = '\0';
return xrealloc(r, sz + 1);
}
#endif
|
