release/src/router/libncurses/ncurses/tinfo/strings.c

   1 /****************************************************************************
   2  * Copyright (c) 2000-2007,2012 Free Software Foundation, Inc.              *
   3  *                                                                          *
   4  * Permission is hereby granted, free of charge, to any person obtaining a  *
   5  * copy of this software and associated documentation files (the            *
   6  * "Software"), to deal in the Software without restriction, including      *
   7  * without limitation the rights to use, copy, modify, merge, publish,      *
   8  * distribute, distribute with modifications, sublicense, and/or sell       *
   9  * copies of the Software, and to permit persons to whom the Software is    *
  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  22  *                                                                          *
  23  * Except as contained in this notice, the name(s) of the above copyright   *
  24  * holders shall not be used in advertising or otherwise to promote the     *
  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
  27  ****************************************************************************/
  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey                                                *
  31  ****************************************************************************/
  32
  33 /*
  34 **      lib_mvcur.c
  35 **/
  36
  37 #include <curses.priv.h>
  38
  39 MODULE_ID("$Id: strings.c,v 1.8 2012/02/22 22:34:31 tom Exp $")
  40
  41 /****************************************************************************
  42  * Useful string functions (especially for mvcur)
  43  ****************************************************************************/
  44
  45 #if !HAVE_STRSTR
  46 NCURSES_EXPORT(char *)
  47 _nc_strstr(const char *haystack, const char *needle)
  48 {
  49     size_t len1 = strlen(haystack);
  50     size_t len2 = strlen(needle);
  51     char *result = 0;
  52
  53     while ((len1 != 0) && (len1-- >= len2)) {
  54         if (!strncmp(haystack, needle, len2)) {
  55             result = (char *) haystack;
  56             break;
  57         }
  58         haystack++;
  59     }
  60     return result;
  61 }
  62 #endif
  63
  64 /*
  65  * Initialize the descriptor so we can append to it.  Note that 'src' may
  66  * be a null pointer (see _nc_str_null), so the corresponding strcat and
  67  * strcpy calls have to allow for this.
  68  */
  69 NCURSES_EXPORT(string_desc *)
  70 _nc_str_init(string_desc * dst, char *src, size_t len)
  71 {
  72     if (dst != 0) {
  73         dst->s_head = src;
  74         dst->s_tail = src;
  75         dst->s_size = len - 1;
  76         dst->s_init = dst->s_size;
  77         if (src != 0)
  78             *src = 0;
  79     }
  80     return dst;
  81 }
  82
  83 /*
  84  * Initialize the descriptor for only tracking the amount of memory used.
  85  */
  86 NCURSES_EXPORT(string_desc *)
  87 _nc_str_null(string_desc * dst, size_t len)
  88 {
  89     return _nc_str_init(dst, 0, len);
  90 }
  91
  92 /*
  93  * Copy a descriptor
  94  */
  95 NCURSES_EXPORT(string_desc *)
  96 _nc_str_copy(string_desc * dst, string_desc * src)
  97 {
  98     *dst = *src;
  99     return dst;
 100 }
 101
 102 /*
 103  * Replaces strcat into a fixed buffer, returning false on failure.
 104  */
 105 NCURSES_EXPORT(bool)
 106 _nc_safe_strcat(string_desc * dst, const char *src)
 107 {
 108     if (src != 0) {
 109         size_t len = strlen(src);
 110
 111         if (len < dst->s_size) {
 112             if (dst->s_tail != 0) {
 113                 _nc_STRCPY(dst->s_tail, src, dst->s_size);
 114                 dst->s_tail += len;
 115             }
 116             dst->s_size -= len;
 117             return TRUE;
 118         }
 119     }
 120     return FALSE;
 121 }
 122
 123 /*
 124  * Replaces strcpy into a fixed buffer, returning false on failure.
 125  */
 126 NCURSES_EXPORT(bool)
 127 _nc_safe_strcpy(string_desc * dst, const char *src)
 128 {
 129     if (src != 0) {
 130         size_t len = strlen(src);
 131
 132         if (len < dst->s_size) {
 133             if (dst->s_head != 0) {
 134                 _nc_STRCPY(dst->s_head, src, dst->s_size);
 135                 dst->s_tail = dst->s_head + len;
 136             }
 137             dst->s_size = dst->s_init - len;
 138             return TRUE;
 139         }
 140     }
 141     return FALSE;
 142 }