/*-------------------------------------------------------------------------

 *

 * quotes.c

 *    string quoting and escaping functions

 *

 * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group

 * Portions Copyright (c) 1994, Regents of the University of California

 *

 *

 * IDENTIFICATION

 *    src/port/quotes.c

 *

 *-------------------------------------------------------------------------

 */

#include "c.h"

/*

 * Escape (by doubling) any single quotes or backslashes in given string

 *

 * Note: this is used to process postgresql.conf entries and to quote

 * string literals in pg_basebackup for writing the recovery configuration.

 * Since postgresql.conf strings are defined to treat backslashes as escapes,

 * we have to double backslashes here.

 *

 * Since this function is only used for parsing or creating configuration

 * files, we do not care about encoding considerations.

 *

 * Returns a malloced() string that it's the responsibility of the caller

 * to free.

 */

char *

escape_single_quotes_ascii(const char *src)

{

  int     len = strlen(src),

        i,

        j;

  char     *result = malloc(len * 2 + 1);

  if (!result)

    return NULL;

  for (i = 0, j = 0; i < len; i++)

  {

    if (SQL_STR_DOUBLE(src[i], true))

      result[j++] = src[i];

    result[j++] = src[i];

  }

  result[j] = '\0';

  return result;

}