tools/perf/util/quote.c

   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 }