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