Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include <stdlib.h>
2#include "strbuf.h"
3#include "quote.h"
4#include "util.h"
5
6/* Help to copy the thing properly quoted for the shell safety.
7 * any single quote is replaced with '\'', any exclamation point
8 * is replaced with '\!', and the whole thing is enclosed in a
9 *
10 * E.g.
11 * original sq_quote result
12 * name ==> name ==> 'name'
13 * a b ==> a b ==> 'a b'
14 * a'b ==> a'\''b ==> 'a'\''b'
15 * a!b ==> a'\!'b ==> 'a'\!'b'
16 */
17static inline int need_bs_quote(char c)
18{
19 return (c == '\'' || c == '!');
20}
21
22static int sq_quote_buf(struct strbuf *dst, const char *src)
23{
24 char *to_free = NULL;
25 int ret;
26
27 if (dst->buf == src)
28 to_free = strbuf_detach(dst, NULL);
29
30 ret = strbuf_addch(dst, '\'');
31 while (!ret && *src) {
32 size_t len = strcspn(src, "'!");
33 ret = strbuf_add(dst, src, len);
34 src += len;
35 while (!ret && need_bs_quote(*src))
36 ret = strbuf_addf(dst, "'\\%c\'", *src++);
37 }
38 if (!ret)
39 ret = strbuf_addch(dst, '\'');
40 free(to_free);
41
42 return ret;
43}
44
45int sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
46{
47 int i, ret;
48
49 /* Copy into destination buffer. */
50 ret = strbuf_grow(dst, 255);
51 for (i = 0; !ret && argv[i]; ++i) {
52 ret = strbuf_addch(dst, ' ');
53 if (ret)
54 break;
55 ret = sq_quote_buf(dst, argv[i]);
56 if (maxlen && dst->len > maxlen)
57 return -ENOSPC;
58 }
59 return ret;
60}