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 '\'', and the caller is
   6  * expected to enclose the result within a single quote pair.
   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  */
  14 char *sq_quote(const char *src)
  15 {
  16         static char *buf = NULL;
  17         int cnt, c;
  18         const char *cp;
  19         char *bp;
  20
  21         /* count bytes needed to store the quoted string. */
  22         for (cnt = 3, cp = src; *cp; cnt++, cp++)
  23                 if (*cp == '\'')
  24                         cnt += 3;
  25
  26         buf = xmalloc(cnt);
  27         bp = buf;
  28         *bp++ = '\'';
  29         while ((c = *src++)) {
  30                 if (c != '\'')
  31                         *bp++ = c;
  32                 else {
  33                         bp = strcpy(bp, "'\\''");
  34                         bp += 4;
  35                 }
  36         }
  37         *bp++ = '\'';
  38         *bp = 0;
  39         return buf;
  40 }
  41