contrib/ncurses/include/nc_string.h

   1 /****************************************************************************
   2  * Copyright 2020 Thomas E. Dickey                                          *
   3  * Copyright 2012-2013,2016 Free Software Foundation, Inc.                  *
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  29
  30 /****************************************************************************
  31  *  Author: Thomas E. Dickey                        2012                    *
  32  ****************************************************************************/
  33
  34 #ifndef STRING_HACKS_H
  35 #define STRING_HACKS_H 1
  36
  37 #include <ncurses_cfg.h>
  38
  39 #if HAVE_BSD_STRING_H
  40 #include <bsd/string.h>
  41 #endif
  42
  43 /*
  44  * $Id: nc_string.h,v 1.8 2020/02/02 23:34:34 tom Exp $
  45  *
  46  * String-hacks.  Use these macros to stifle warnings on (presumably) correct
  47  * uses of strcat, strcpy and sprintf.
  48  *
  49  * By the way -
  50  * A fundamental limitation of the interfaces (and frequent issue in bug
  51  * reports using these functions) is that sizes are passed as unsigned values
  52  * (with associated sign-extension problems), limiting their effectiveness
  53  * when checking for buffer overflow.
  54  */
  55
  56 #ifdef __cplusplus
  57 #define NCURSES_VOID            /* nothing */
  58 #else
  59 #define NCURSES_VOID (void)
  60 #endif
  61
  62 #if USE_STRING_HACKS && HAVE_STRLCAT
  63 #define _nc_STRCAT(d,s,n)       NCURSES_VOID strlcat((d),(s),NCURSES_CAST(size_t,n))
  64 #define _nc_STRNCAT(d,s,m,n)    NCURSES_VOID strlcat((d),(s),NCURSES_CAST(size_t,m))
  65 #else
  66 #define _nc_STRCAT(d,s,n)       NCURSES_VOID strcat((d),(s))
  67 #define _nc_STRNCAT(d,s,m,n)    NCURSES_VOID strncat((d),(s),(n))
  68 #endif
  69
  70 #if USE_STRING_HACKS && HAVE_STRLCPY
  71 #define _nc_STRCPY(d,s,n)       NCURSES_VOID strlcpy((d),(s),NCURSES_CAST(size_t,n))
  72 #define _nc_STRNCPY(d,s,n)      NCURSES_VOID strlcpy((d),(s),NCURSES_CAST(size_t,n))
  73 #else
  74 #define _nc_STRCPY(d,s,n)       NCURSES_VOID strcpy((d),(s))
  75 #define _nc_STRNCPY(d,s,n)      NCURSES_VOID strncpy((d),(s),(n))
  76 #endif
  77
  78 #if USE_STRING_HACKS && HAVE_SNPRINTF
  79 #define _nc_SPRINTF             NCURSES_VOID snprintf
  80 #define _nc_SLIMIT(n)           NCURSES_CAST(size_t,n),
  81 #else
  82 #define _nc_SPRINTF             NCURSES_VOID sprintf
  83 #define _nc_SLIMIT(n)           /* nothing */
  84 #endif
  85
  86 #endif /* STRING_HACKS_H */