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
|
/* xargs.c - Run command with arguments taken from stdin.
*
* Copyright 2011 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/xargs.html
*
* TODO: Rich's whitespace objection, env size isn't fixed anymore.
USE_XARGS(NEWTOY(xargs, "^I:E:L#ptxrn#<1s#0", TOYFLAG_USR|TOYFLAG_BIN))
config XARGS
bool "xargs"
default y
help
usage: xargs [-ptxr0] [-s NUM] [-n NUM] [-L NUM] [-E STR] COMMAND...
Run command line one or more times, appending arguments from stdin.
If command exits with 255, don't launch another even if arguments remain.
-s Size in bytes per command line
-n Max number of arguments per command
-0 Each argument is NULL terminated, no whitespace or quote processing
#-p Prompt for y/n from tty before running each command
#-t Trace, print command line to stderr
#-x Exit if can't fit everything in one command
#-r Don't run command with empty input
#-L Max number of lines of input per command
-E stop at line matching string
config XARGS_PEDANTIC
bool "TODO xargs pedantic posix compatability"
default n
depends on XARGS
help
This version supports insane posix whitespace handling rendered obsolete
by -0 mode.
*/
#define FOR_xargs
#include "toys.h"
GLOBALS(
long max_bytes;
long max_entries;
long L;
char *eofstr;
char *I;
long entries, bytes;
char delim;
)
// If out==NULL count TT.bytes and TT.entries, stopping at max.
// Otherwise, fill out out[]
// Returning NULL means need more data.
// Returning char * means hit data limits, start of data left over
// Returning 1 means hit data limits, but consumed all data
// Returning 2 means hit -E eofstr
static char *handle_entries(char *data, char **entry)
{
if (TT.delim) {
char *s = data;
// Chop up whitespace delimited string into args
while (*s) {
char *save;
while (isspace(*s)) {
if (entry) *s = 0;
s++;
}
if (TT.max_entries && TT.entries >= TT.max_entries)
return *s ? s : (char *)1;
if (!*s) break;
save = s;
for (;;) {
if (++TT.bytes >= TT.max_bytes && TT.max_bytes) return save;
if (!*s || isspace(*s)) break;
s++;
}
if (TT.eofstr) {
int len = s-save;
if (len == strlen(TT.eofstr) && !strncmp(save, TT.eofstr, len))
return (char *)2;
}
if (entry) entry[TT.entries] = save;
++TT.entries;
}
// -0 support
} else {
TT.bytes += strlen(data)+1;
if (TT.max_bytes && TT.bytes >= TT.max_bytes) return data;
if (TT.max_entries && TT.entries >= TT.max_entries)
return (char *)1;
if (entry) entry[TT.entries] = data;
TT.entries++;
}
return NULL;
}
void xargs_main(void)
{
struct double_list *dlist = NULL, *dtemp;
int entries, bytes, done = 0, status;
char *data = NULL, **out;
if (!(toys.optflags & FLAG_0)) TT.delim = '\n';
// If no optargs, call echo.
if (!toys.optc) {
free(toys.optargs);
*(toys.optargs = xzalloc(2*sizeof(char *)))="echo";
toys.optc = 1;
}
for (entries = 0, bytes = -1; entries < toys.optc; entries++, bytes++)
bytes += strlen(toys.optargs[entries]);
// Loop through exec chunks.
while (data || !done) {
TT.entries = 0;
TT.bytes = bytes;
// Loop reading input
for (;;) {
// Read line
if (!data) {
ssize_t l = 0;
l = getdelim(&data, (size_t *)&l, TT.delim, stdin);
if (l<0) {
data = 0;
done++;
break;
}
}
dlist_add(&dlist, data);
// Count data used
data = handle_entries(data, NULL);
if (!data) continue;
if (data == (char *)2) done++;
if ((long)data <= 2) data = 0;
else data = xstrdup(data);
break;
}
// Accumulate cally thing
if (data && !TT.entries) error_exit("argument too long");
out = xzalloc((entries+TT.entries+1)*sizeof(char *));
// Fill out command line to exec
memcpy(out, toys.optargs, entries*sizeof(char *));
TT.entries = 0;
TT.bytes = bytes;
if (dlist) dlist->prev->next = 0;
for (dtemp = dlist; dtemp; dtemp = dtemp->next)
handle_entries(dtemp->data, out+entries);
pid_t pid=xvfork();
if (!pid) {
xclose(0);
open("/dev/null", O_RDONLY);
xexec(out);
}
waitpid(pid, &status, 0);
status = WIFEXITED(status) ? WEXITSTATUS(status) : WTERMSIG(status)+127;
// Abritrary number of execs, can't just leak memory each time...
while (dlist) {
struct double_list *dtemp = dlist->next;
free(dlist->data);
free(dlist);
dlist = dtemp;
}
free(out);
}
}
|
