1 /****************************************************************************
2 * Copyright (c) 2000-2012,2017 Free Software Foundation, Inc. *
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5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
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9 * copies of the Software, and to permit persons to whom the Software is *
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12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Thomas E. Dickey *
31 ****************************************************************************/
37 #include <curses.priv.h>
40 MODULE_ID("$Id: strings.c,v 1.9 2017/08/26 13:16:11 tom Exp $")
42 /****************************************************************************
43 * Useful string functions (especially for mvcur)
44 ****************************************************************************/
47 NCURSES_EXPORT(char *)
48 _nc_strstr(const char *haystack, const char *needle)
50 size_t len1 = strlen(haystack);
51 size_t len2 = strlen(needle);
54 while ((len1 != 0) && (len1-- >= len2)) {
55 if (!strncmp(haystack, needle, len2)) {
56 result = (char *) haystack;
66 * Initialize the descriptor so we can append to it. Note that 'src' may
67 * be a null pointer (see _nc_str_null), so the corresponding strcat and
68 * strcpy calls have to allow for this.
70 NCURSES_EXPORT(string_desc *)
71 _nc_str_init(string_desc * dst, char *src, size_t len)
76 dst->s_size = len - 1;
77 dst->s_init = dst->s_size;
85 * Initialize the descriptor for only tracking the amount of memory used.
87 NCURSES_EXPORT(string_desc *)
88 _nc_str_null(string_desc * dst, size_t len)
90 return _nc_str_init(dst, 0, len);
96 NCURSES_EXPORT(string_desc *)
97 _nc_str_copy(string_desc * dst, string_desc * src)
104 * Replaces strcat into a fixed buffer, returning false on failure.
107 _nc_safe_strcat(string_desc * dst, const char *src)
110 size_t len = strlen(src);
112 if (len < dst->s_size) {
113 if (dst->s_tail != 0) {
114 _nc_STRCPY(dst->s_tail, src, dst->s_size);
125 * Replaces strcpy into a fixed buffer, returning false on failure.
128 _nc_safe_strcpy(string_desc * dst, const char *src)
131 size_t len = strlen(src);
133 if (len < dst->s_size) {
134 if (dst->s_head != 0) {
135 _nc_STRCPY(dst->s_head, src, dst->s_size);
136 dst->s_tail = dst->s_head + len;
138 dst->s_size = dst->s_init - len;