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/****************************************************************************
* Copyright (c) 2000-2003,2007 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* Author: Thomas E. Dickey *
****************************************************************************/
/*
** lib_mvcur.c
**/
#include <curses.priv.h>
MODULE_ID("$Id: strings.c,v 1.6 2007/08/11 17:12:17 tom Exp $")
/****************************************************************************
* Useful string functions (especially for mvcur)
****************************************************************************/
#if !HAVE_STRSTR
NCURSES_EXPORT(char *)
_nc_strstr(const char *haystack, const char *needle)
{
size_t len1 = strlen(haystack);
size_t len2 = strlen(needle);
char *result = 0;
while ((len1 != 0) && (len1-- >= len2)) {
if (!strncmp(haystack, needle, len2)) {
result = (char *) haystack;
break;
}
haystack++;
}
return result;
}
#endif
/*
* Initialize the descriptor so we can append to it. Note that 'src' may
* be a null pointer (see _nc_str_null), so the corresponding strcat and
* strcpy calls have to allow for this.
*/
NCURSES_EXPORT(string_desc *)
_nc_str_init(string_desc * dst, char *src, size_t len)
{
if (dst != 0) {
dst->s_head = src;
dst->s_tail = src;
dst->s_size = len - 1;
dst->s_init = dst->s_size;
if (src != 0)
*src = 0;
}
return dst;
}
/*
* Initialize the descriptor for only tracking the amount of memory used.
*/
NCURSES_EXPORT(string_desc *)
_nc_str_null(string_desc * dst, size_t len)
{
return _nc_str_init(dst, 0, len);
}
/*
* Copy a descriptor
*/
NCURSES_EXPORT(string_desc *)
_nc_str_copy(string_desc * dst, string_desc * src)
{
*dst = *src;
return dst;
}
/*
* Replaces strcat into a fixed buffer, returning false on failure.
*/
NCURSES_EXPORT(bool)
_nc_safe_strcat(string_desc * dst, const char *src)
{
if (src != 0) {
size_t len = strlen(src);
if (len < dst->s_size) {
if (dst->s_tail != 0) {
strcpy(dst->s_tail, src);
dst->s_tail += len;
}
dst->s_size -= len;
return TRUE;
}
}
return FALSE;
}
/*
* Replaces strcpy into a fixed buffer, returning false on failure.
*/
NCURSES_EXPORT(bool)
_nc_safe_strcpy(string_desc * dst, const char *src)
{
if (src != 0) {
size_t len = strlen(src);
if (len < dst->s_size) {
if (dst->s_head != 0) {
strcpy(dst->s_head, src);
dst->s_tail = dst->s_head + len;
}
dst->s_size = dst->s_init - len;
return TRUE;
}
}
return FALSE;
}
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