tools/perf/util/quote.c

   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  */
  17 static inline int need_bs_quote(char c)
  18 {
  19         return (c == '\'' || c == '!');
  20 }
  21
  22 static 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
  45 int 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                         die("Too many or long arguments");
  58         }
  59         return ret;
  60 }