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
|
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <ctype.h>
#include <regexp.h>
char digit[] = "0123456789";
char *suffix = "";
char *stem = "x";
char suff[] = "aa";
char name[200];
Biobuf bout;
Biobuf *output = &bout;
extern int nextfile(void);
extern int matchfile(Resub*);
extern void openf(void);
extern char *fold(char*,int);
extern void usage(void);
extern void badexp(void);
void
main(int argc, char *argv[])
{
Reprog *exp;
char *pattern = 0;
int n = 1000;
char *line;
int xflag = 0;
int iflag = 0;
Biobuf bin;
Biobuf *b = &bin;
char buf[256];
ARGBEGIN {
case 'l':
case 'n':
n=atoi(EARGF(usage()));
break;
case 'e':
pattern = strdup(EARGF(usage()));
break;
case 'f':
stem = strdup(EARGF(usage()));
break;
case 's':
suffix = strdup(EARGF(usage()));
break;
case 'x':
xflag++;
break;
case 'i':
iflag++;
break;
default:
usage();
break;
} ARGEND;
if(argc < 0 || argc > 1)
usage();
if(argc != 0) {
b = Bopen(argv[0], OREAD);
if(b == nil) {
fprint(2, "split: can't open %s: %r\n", argv[0]);
exits("open");
}
} else
Binit(b, 0, OREAD);
if(pattern) {
if(!(exp = regcomp(iflag? fold(pattern,strlen(pattern)): pattern)))
badexp();
while((line=Brdline(b,'\n')) != 0) {
Resub match[2];
memset(match, 0, sizeof match);
line[Blinelen(b)-1] = 0;
if(regexec(exp,iflag?fold(line,Blinelen(b)-1):line,match,2)) {
if(matchfile(match) && xflag)
continue;
} else if(output == 0)
nextfile(); /* at most once */
Bwrite(output, line, Blinelen(b)-1);
Bputc(output, '\n');
}
} else {
int linecnt = n;
while((line=Brdline(b,'\n')) != 0) {
if(++linecnt > n) {
nextfile();
linecnt = 1;
}
Bwrite(output, line, Blinelen(b));
}
/*
* in case we didn't end with a newline, tack whatever's
* left onto the last file
*/
while((n = Bread(b, buf, sizeof(buf))) > 0)
Bwrite(output, buf, n);
}
if(b != nil)
Bterm(b);
exits(0);
}
int
nextfile(void)
{
static int canopen = 1;
if(suff[0] > 'z') {
if(canopen)
fprint(2, "split: file %szz not split\n",stem);
canopen = 0;
} else {
strcpy(name, stem);
strcat(name, suff);
if(++suff[1] > 'z')
suff[1] = 'a', ++suff[0];
openf();
}
return canopen;
}
int
matchfile(Resub *match)
{
if(match[1].s.sp) {
int len = match[1].e.ep - match[1].s.sp;
strncpy(name, match[1].s.sp, len);
strcpy(name+len, suffix);
openf();
return 1;
}
return nextfile();
}
void
openf(void)
{
static int fd = 0;
Bflush(output);
Bterm(output);
if(fd > 0)
close(fd);
fd = create(name,OWRITE,0666);
if(fd < 0) {
fprint(2, "grep: can't create %s: %r\n", name);
exits("create");
}
Binit(output, fd, OWRITE);
}
char *
fold(char *s, int n)
{
static char *fline;
static int linesize = 0;
char *t;
if(linesize < n+1){
fline = realloc(fline,n+1);
linesize = n+1;
}
for(t=fline; *t++ = tolower((uchar)*s++); )
continue;
/* we assume the 'A'-'Z' only appear as themselves
* in a utf encoding.
*/
return fline;
}
void
usage(void)
{
fprint(2, "usage: split [-n num] [-e exp] [-f stem] [-s suff] [-x] [-i] [file]\n");
exits("usage");
}
void
badexp(void)
{
fprint(2, "split: bad regular expression\n");
exits("bad regular expression");
}
|
