mirror of
https://github.com/MidnightCommander/mc
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104 lines
3.9 KiB
C
104 lines
3.9 KiB
C
/*
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Functions for replacing substrings in strings.
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Copyright (C) 2013-2024
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Free Software Foundation, Inc.
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Written by:
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Slava Zanko <slavazanko@gmail.com>, 2013;
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This file is part of the Midnight Commander.
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The Midnight Commander is free software: you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of the License,
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or (at your option) any later version.
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The Midnight Commander is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include "lib/global.h"
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#include "lib/strutil.h"
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/*** global variables ****************************************************************************/
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/*** file scope macro definitions ****************************************************************/
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/*** file scope type declarations ****************************************************************/
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/*** forward declarations (file scope functions) *************************************************/
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/*** file scope variables ************************************************************************/
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/* --------------------------------------------------------------------------------------------- */
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/*** file scope functions ************************************************************************/
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/* --------------------------------------------------------------------------------------------- */
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/* --------------------------------------------------------------------------------------------- */
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/*** public functions ****************************************************************************/
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/* --------------------------------------------------------------------------------------------- */
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/**
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* Replace all substrings 'needle' in string 'haystack' by 'replacement'.
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* If the 'needle' in the 'haystack' is escaped by backslash,
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* then this occurrence isn't be replaced.
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*
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* @param haystack string contains substrings for replacement. Cannot be NULL.
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* @param needle string for search. Cannot be NULL.
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* @param replacement string for replace. Cannot be NULL.
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* @return newly allocated string with replaced substrings or NULL if @haystack is empty.
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*/
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char *
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str_replace_all (const char *haystack, const char *needle, const char *replacement)
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{
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size_t needle_len, replacement_len;
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GString *return_str = NULL;
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char *needle_in_str;
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needle_len = strlen (needle);
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replacement_len = strlen (replacement);
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while ((needle_in_str = strstr (haystack, needle)) != NULL)
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{
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if (return_str == NULL)
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return_str = g_string_sized_new (32);
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if (str_is_char_escaped (haystack, needle_in_str))
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{
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char *backslash = needle_in_str - 1;
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if (haystack != backslash)
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g_string_append_len (return_str, haystack, backslash - haystack);
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g_string_append_len (return_str, needle_in_str, needle_in_str - backslash);
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haystack = needle_in_str + 1;
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}
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else
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{
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if (needle_in_str != haystack)
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g_string_append_len (return_str, haystack, needle_in_str - haystack);
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g_string_append_len (return_str, replacement, replacement_len);
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haystack = needle_in_str + needle_len;
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}
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}
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if (*haystack != '\0')
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{
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if (return_str == NULL)
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return strdup (haystack);
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g_string_append (return_str, haystack);
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}
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return (return_str != NULL ? g_string_free (return_str, FALSE) : NULL);
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}
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/* --------------------------------------------------------------------------------------------- */
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