Watcom C Library : vfscanf, vprintf, vscanf, vsprintf, vsscanf

 

 

Watcom C Library Reference : vfscanf, vprintf, vscanf, vsprintf, vsscanf

 

 

 

 

vfscanf

 

Synopsis : #include <stdio.h> 

              #include <stdarg.h>

              int vfscanf( FILE *fp, const char *format, va_list arg );

 

Description : The vfscanf function scans input from the file designated by fp under control of the argument format. The format string is described under the description of the scanf function.

The vfscanf function is equivalent to the fscanf function, with a variable argument list replaced with arg, which has been initialized using the va_start macro.

 

 

Returns : The vfscanf function returns EOF when the scanning is terminated by reaching the end of the input stream. Otherwise, the number of input arguments for which values were successfully scanned and stored is returned. When a file input error occurs, the errno global variable may be set.

 

 

See Also : cscanf, fscanf, scanf, sscanf, va_arg, va_end, va_start, vcscanf, vscanf, vsscanf

 

Example :

#include <stdio.h> 

#include <stdarg.h>

void ffind( FILE *fp, char *format, ... )

{
    va_list   arglist;

    va_start( arglist, format );

    vfscanf( fp, format, arglist );

    va_end( arglist );

}

 

void main( )

{
    int     day, year;

    char   weekday[10], month[12];

    ffind( stdin, "%s %s %d %d", weekday, month, &day, &year ); 

    printf( "\n%s, %s %d, %d\n", weekday, month, day, year );

}

 

Classification : WATCOM
Systems : All

 

 

 

 

 

 

 

vprintf

 

Synopsis : #include <stdio.h> 

              #include <stdarg.h>

              int vprintf( const char *format, va_list arg );

 

Description : The vprintf function writes output to the file stdout under control of the argument format. The format string is described under the description of the printf function. The vprintf function is equivalent to the printf function, with the variable argument list replaced with arg, which has been initialized by the va_start macro.

 

 

Returns : The vprintf function returns the number of characters written, or a negative value if an output error occurred. When an error has occurred, errno contains a value indicating the type of error that has been detected.

 

 

See Also : _bprintf, cprintf, fprintf, printf, sprintf, va_arg, va_end, va_start, _vbprintf, vcprintf, vfprintf, vsprintf

 

Example :

The following shows the use of vprintf in a general error message routine.

#include <stdio.h> 

#include <stdarg.h>

void errmsg( char *format, ... )

{
    va_list   arglist;
   

    printf( "Error: " );

    va_start( arglist, format );

    vprintf( format, arglist );

    va_end( arglist );

}

 

void main( )

{
    errmsg( "%s %d %s", "Failed", 100, "times" );

}

 

Classification : ANSI
Systems : All

 

 

 

 

 

 

 

vscanf

 

Synopsis : #include <stdio.h> 

              #include <stdarg.h>

              int vscanf( const char *format, va_list arg );

 

Description : The vscanf function scans input from the file designated by stdin under control of the argument format. The format string is described under the description of the scanf function.

The vscanf function is equivalent to the scanf function, with a variable argument list replaced with arg, which has been initialized using the va_start macro.

 

 

Returns : The vscanf function returns EOF when the scanning is terminated by reaching the end of the input stream. Otherwise, the number of input arguments for which values were successfully scanned and stored is returned.

 

 

See Also : cscanf, fscanf, scanf, sscanf, va_arg, va_end, va_start, vcscanf, vfscanf, vsscanf

 

Example :

#include <stdio.h> 

#include <stdarg.h>

void find ( char *format, ... )

{
    va_list   arglist;

    va_start( arglist, format );

    vscanf( format, arglist );

    va_end( arglist );

}

 

void main( )

{
    int     day, year;

    char   weekday[10], month[12];

    find( "%s %s %d %d", weekday, month, &day, &year );

    printf( "\n%s, %s %d, %d\n", weekday, month, day, year );

}

 

Classification : WATCOM
Systems : All

 

 

 

 

 

 

 

vsprintf

 

Synopsis : #include <stdio.h> 

              #include <stdarg.h>

              int vsprintf( char *buf, const char *format, va_list arg );


Description : The vsprintf function formats data under control of the format control string and writes the result to buf. The format string is described under the description of the printf function. The vsprintf function is equivalent to the sprintf function, with the variable argument list replaced with arg, which has been initialized by the va_start macro.

 

 

Returns : The vsprintf function returns the number of characters written, or a negative value if an output error occurred.

 

 

See Also : _bprintf, cprintf, fprintf, printf, sprintf, va_arg, va_end, va_start, _vbprintf, vcprintf, vfprintf, vprintf

 

Example :

The following shows the use of vsprintf in a general error message routine.

#include <stdio.h> 

#include <stdarg.h> 

#include <string.h>

char     msgbuf[80];

char *fmtmsg( char *format, ... )

{
    va_list   arglist;

    va_start( arglist, format );

    strcpy( msgbuf, "Error: " );

    vsprintf( &msgbuf[7], format, arglist );

    va_end( arglist );

    return( msgbuf );

}

 

void main( )

{
    char     *msg;

    msg = fmtmsg( "%s %d %s", "Failed", 100, "times" );

    printf( "%s\n", msg );

}

 

Classification : ANSI
Systems : All

 

 

 

 

 

 

 

vsscanf

 

Synopsis : #include <stdio.h> 

              #include <stdarg.h>

              int vsscanf( const char *in_string, const char *format, va_list arg );


Description : The vsscanf function scans input from the string designated by in_string under control of the argument format. The format string is described under the description of the scanf function.

The vsscanf function is equivalent to the sscanf function, with a variable argument list replaced with arg, which has been initialized using the va_start macro.

 

 

Returns : The vsscanf function returns EOF when the scanning is terminated by reaching the end of the input string. Otherwise, the number of input arguments for which values were successfully scanned and stored is returned.

 

 

See Also : cscanf, fscanf, scanf, sscanf, va_arg, va_end, va_start, vcscanf, vfscanf, vscanf

 

Example :

#include <stdio.h> 

#include <stdarg.h>

void sfind( char *string, char *format, ... )

{
    va_list   arglist;

    va_start( arglist, format );

    vsscanf( string, format, arglist );

    va_end( arglist );

}

 

void main( )

{
    int     day, year;

    char   weekday[10], month[12];

    sfind( "Saturday April 13 1999", "%s %s %d %d", weekday, month, &day, &year ); 

    printf( "\n%s, %s %d, %d\n", weekday, month, day, year );

}

 

Classification : WATCOM
Systems : All

 

 

 

 

 

 

 

 

 

 

This manual describes the WATCOM C library for DOS, Windows, and OS/2, It includes the Standard C Library (as defined in the ANSI C Standard).

 

WATCOM C Language Reference manual describes the ANSI C Programming language and extensions to it which are supported by WATCOM C/C++ (32bit)