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RedHat 9 (Linux i386) - man page for vwscanw (redhat section 3X)

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curs_scanw(3X)									   curs_scanw(3X)

       scanw,  wscanw,	mvscanw,  mvwscanw,  vwscanw,  vw_scanw  - convert formatted input from a
       curses window

       #include <curses.h>

       int scanw(char *fmt, ...);
       int wscanw(WINDOW *win, char *fmt, ...);
       int mvscanw(int y, int x, char *fmt, ...);
       int mvwscanw(WINDOW *win, int y, int x, char *fmt, ...);
       int vw_scanw(WINDOW *win, char *fmt, va_list varglist);
       int vwscanw(WINDOW *win, char *fmt, va_list varglist);

       The scanw, wscanw and mvscanw routines are analogous to scanf [see scanf(3S)].  The effect
       of  these  routines is as though wgetstr were called on the window, and the resulting line
       used as input for sscanf(3).  Fields which do not map to a variable in the fmt  field  are

       The  vwscanw and vw_scanw routines are analogous to vscanf.  They perform a wscanw using a
       variable argument list.	The third argument is a va_list, a pointer to  a  list	of  argu-
       ments, as defined in <stdarg.h>.

       vwscanw	returns  ERR  on  failure and an integer equal to the number of fields scanned on

       Applications may use the return value from the scanw, wscanw, mvscanw  and  mvwscanw  rou-
       tines to determine the number of fields which were mapped in the call.

       The  XSI  Curses  standard,  Issue  4  describes these functions.  The function vwscanw is
       marked TO BE WITHDRAWN, and is to be replaced by a function vw_scanw using the  <stdarg.h>
       interface.  The Single Unix Specification, Version 2 states that vw_scanw  is preferred to
       vwscanw since the latter requires including <varargs.h>, which cannot be used in the  same
       file  as <stdarg.h>.  This implementation uses <stdarg.h> for both, because that header is
       included in <curses.h>.

       Both XSI and The Single Unix Specification, Version 2 state that  these	functions  return
       ERR  or	OK.   Since  the underlying scanf can return the number of items scanned, and the
       SVr4 code was documented to use this feature, this is probably an editing error which  was
       introduced  in  XSI,  rather  than being done intentionally.  Portable applications should
       only test if the return value is ERR, since the OK value (zero) is likely to  be  mislead-
       ing.   One possible way to get useful results would be to use a "%n" conversion at the end
       of the format string to ensure that something was processed.

       curses(3X), curs_getstr(3X), curs_printw(3X), scanf(3S)

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