quote.h

   1 #ifndef QUOTE_H
   2 #define QUOTE_H
   3
   4 #include <stddef.h>
   5 #include <stdio.h>
   6
   7 /* Help to copy the thing properly quoted for the shell safety.
   8  * any single quote is replaced with '\'', any exclamation point
   9  * is replaced with '\!', and the whole thing is enclosed in a
  10  * single quote pair.
  11  *
  12  * For example, if you are passing the result to system() as an
  13  * argument:
  14  *
  15  * sprintf(cmd, "foobar %s %s", sq_quote(arg0), sq_quote(arg1))
  16  *
  17  * would be appropriate.  If the system() is going to call ssh to
  18  * run the command on the other side:
  19  *
  20  * sprintf(cmd, "git-diff-tree %s %s", sq_quote(arg0), sq_quote(arg1));
  21  * sprintf(rcmd, "ssh %s %s", sq_quote(host), sq_quote(cmd));
  22  *
  23  * Note that the above examples leak memory!  Remember to free result from
  24  * sq_quote() in a real application.
  25  *
  26  * sq_quote_buf() writes to an existing buffer of specified size; it
  27  * will return the number of characters that would have been written
  28  * excluding the final null regardless of the buffer size.
  29  */
  30
  31 extern char *sq_quote(const char *src);
  32 extern size_t sq_quote_buf(char *dst, size_t n, const char *src);
  33
  34 /* This unwraps what sq_quote() produces in place, but returns
  35  * NULL if the input does not look like what sq_quote would have
  36  * produced.
  37  */
  38 extern char *sq_dequote(char *);
  39
  40 extern int quote_c_style(const char *name, char *outbuf, FILE *outfp,
  41                          int nodq);
  42 extern char *unquote_c_style(const char *quoted, const char **endp);
  43
  44 extern void write_name_quoted(const char *prefix, const char *name,
  45                               int quote, FILE *out);
  46
  47 #endif