1 /*-------------------------------------------------------------------------
2  *
3  * quotes.c
4  *	  string quoting and escaping functions
5  *
6  * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  *	  src/port/quotes.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 
16 #include "c.h"
17 
18 /*
19  * Escape (by doubling) any single quotes or backslashes in given string
20  *
21  * Note: this is used to process postgresql.conf entries and to quote
22  * string literals in pg_basebackup for creating recovery.conf.
23  * Since postgresql.conf strings are defined to treat backslashes as escapes,
24  * we have to double backslashes here.
25  *
26  * Since this function is only used for parsing or creating configuration
27  * files, we do not care about encoding considerations.
28  *
29  * Returns a malloced() string that it's the responsibility of the caller
30  * to free.
31  */
32 char *
escape_single_quotes_ascii(const char * src)33 escape_single_quotes_ascii(const char *src)
34 {
35 	int			len = strlen(src),
36 				i,
37 				j;
38 	char	   *result = malloc(len * 2 + 1);
39 
40 	if (!result)
41 		return NULL;
42 
43 	for (i = 0, j = 0; i < len; i++)
44 	{
45 		if (SQL_STR_DOUBLE(src[i], true))
46 			result[j++] = src[i];
47 		result[j++] = src[i];
48 	}
49 	result[j] = '\0';
50 	return result;
51 }
52