-
Notifications
You must be signed in to change notification settings - Fork 3
/
csvsplit.c
212 lines (184 loc) · 4.33 KB
/
csvsplit.c
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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
/*
CSVC99 - SIMD-accelerated csv parser in C99
Copyright (c) 2019-2020 CK Tan
CSVC99 can be used for free under the GNU General Public License
version 3, where anything released into public must be open source,
or under a commercial license. The commercial license does not
cover derived or ported versions created by third parties under
GPL. To inquire about commercial license, please send email to
*/
#define _GNU_SOURCE
#include "csv.h"
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
const char *g_pname = 0;
const char *g_prefix = "x";
int g_part = 0;
int64_t g_nbyte = 0;
int64_t g_nrec = 0;
#define perr(M, ...) fprintf(stderr, M, ##__VA_ARGS__)
#define pout(M, ...) fprintf(stdout, M, ##__VA_ARGS__)
static void fatal(const char *msg) {
perr("%s\n", msg);
exit(1);
}
static void outofmemory() {
perr("ERROR: out of memory\n");
exit(1);
}
static void prow(char *ptr, int len) {
static FILE *fp = 0;
static int64_t nb = 0;
static int64_t nr = 0;
if (fp && ((g_nbyte > 0 && nb + len > g_nbyte) || (g_nrec > 0 && nr >= g_nrec))) {
fclose(fp);
fp = 0;
nb = 0;
nr = 0;
}
if (!fp) {
char fname[100];
sprintf(fname, "%s0%d", g_prefix, g_part++);
fp = fopen(fname, "w");
if (!fp) {
perror("fopen");
fatal("ERROR: ... while trying to create output file\n");
exit(1);
}
nb = nr = 0;
}
int n = fwrite(ptr, len, 1, fp);
if (n != 1) {
fatal("ERROR: cannot write to file\n");
}
nb += len;
nr += 1;
}
void do_split(FILE *fp) {
char nullstr[20];
nullstr[0] = 0;
csv_parse_t *cp = csv_open('"', '"', ',', nullstr);
if (!cp) {
fatal("csv_open failed");
}
int bufsz = 1024 * 64;
char *buf = calloc(1, bufsz);
char *p = buf;
char *q = buf;
if (!buf) {
outofmemory();
}
while (!feof(fp)) {
// shift forward
if (p != buf) {
memmove(buf, p, q - p);
q = buf + (q - p);
p = buf;
}
// expand
if (p + bufsz == q) {
if (bufsz >= 1024 * 1024 * 128) {
fatal("ERROR: row bigger than 128MB\n");
}
char *tmp;
int newsz = bufsz * 2;
if (!(tmp = realloc(buf, newsz))) {
outofmemory();
}
buf = tmp;
bufsz = newsz;
}
// fill
int avail = bufsz - (q - p);
int n = fread(q, 1, avail, fp);
if (n < 0) {
perror("fread");
exit(1);
}
q += n;
// parse p..q
while (p < q) {
n = csv_line(cp, p, q - p);
if (n < 0)
fatal("ERROR: csv_feed failed\n");
if (n == 0)
break;
prow(p, n);
p += n;
}
}
if (p < q) {
prow(p, q - p);
}
free(buf);
csv_close(cp);
}
void usage(int exitcode, const char *msg) {
perr("usage: %s [OPTION] ... [FILE [PREFIX]]\n", g_pname);
perr("\n");
perr(" -h\n");
perr(" print this help message\n");
perr(" -b nbytes\n");
perr(" split into files of at most nbytes each (at least one "
"record)\n");
perr(" -r nrecs\n");
perr(" split into files of at most nrecs records each\n");
perr("\n");
perr("%s", msg ? msg : "");
exit(exitcode);
}
int main(int argc, char *argv[]) {
int opt;
g_pname = argv[0];
while ((opt = getopt(argc, argv, "hb:r:")) != -1) {
switch (opt) {
case 'h':
usage(0, 0);
break;
case 'b':
g_nbyte = strtol(optarg, 0, 0);
if (g_nbyte <= 0) {
usage(1,
"ERROR: invalid -b nbytes option. Please supply a +ve integer\n");
}
break;
case 'r':
g_nrec = strtol(optarg, 0, 0);
if (g_nrec <= 0) {
usage(1,
"ERROR: invalid -r nrecs option. Please supply a +ve integer\n");
}
break;
default:
usage(1, "ERROR: unknown option\n");
break;
}
}
if (g_nbyte > 0 && g_nrec > 0) {
usage(1, "ERROR: specify only one of -b or -r options\n");
}
FILE *fp = stdin;
if (optind < argc) {
char *fname = argv[optind++];
if (0 == strcmp(fname, "-")) {
fp = stdin;
} else if (!(fp = freopen(fname, "r", stdin))) {
perror("fopen");
exit(1);
}
}
if (optind < argc) {
g_prefix = argv[optind++];
}
if (optind != argc) {
usage(1, "ERROR: unexpected arguments at end of command\n");
}
do_split(fp);
return 0;
}