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vscnprintf(9) [centos man page]

VSCNPRINTF(9)						     Basic C Library Functions						     VSCNPRINTF(9)

NAME
vscnprintf - Format a string and place it in a buffer SYNOPSIS
int vscnprintf(char * buf, size_t size, const char * fmt, va_list args); ARGUMENTS
buf The buffer to place the result into size The size of the buffer, including the trailing null space fmt The format string to use args Arguments for the format string DESCRIPTION
The return value is the number of characters which have been written into the buf not including the trailing ''. If size is == 0 the function returns 0. If you're not already dealing with a va_list consider using scnprintf. See the vsnprintf documentation for format string extensions over C99. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 VSCNPRINTF(9)

Check Out this Related Man Page

vprintf(3)						     Library Functions Manual							vprintf(3)

NAME
vprintf, vfprintf, vsnprintf, vsprintf - Format a variable number of parameters for output LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <stdarg.h> #include <stdio.h> int vprintf( const char *format, va_list printarg); int vfprintf( FILE *stream, const char *format, va_list printarg); int vsnprintf( char *string, size_t n, const char *format, va_list printarg); int vsprintf( char *string, const char *format, va_list printarg); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: vfprintf(), vprintf(), vsnprintf(), vsprintf(): ISO C, XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies a character string that contains two types of objects: Plain characters, which are copied to the output stream. Conversion spec- ifications, each of which causes zero or more items to be fetched from the stdarg parameter lists. Specifies the arguments to be printed. Specifies the output stream. Specifies the buffer to which output is printed. Specifies the size of the buffer referred to by string. DESCRIPTION
The vprintf(), vfprintf(), vsnprintf(), and vsprintf() functions format and write stdarg parameter lists. These functions are the same as the printf(), fprintf(), snprintf(), and sprintf() functions, respectively, except that these functions are not called with a variable number of parameters. Instead, vprintf(), vfprintf(), vsnprintf(), and vsprintf() are called with a parameter list pointer as defined by stdarg. Because these functions invoke the va_arg() macro and not the va_end() macro, the value of printarg is indeterminate after a return. Therefore, applications should execute a call to the va_end() macro after a call to one of these functions. EXAMPLES
The following example demonstrates how the vfprintf() function can be used to write an error routine: #include <stdarg.h> #include <stdio.h> void error(char *funct, char *fmt, ...) { va_list args; /* ** Display the name of the function that called error */ fprintf(stderr, "ERROR in %s: ", funct); /* ** Display the remainder of the message */ va_start(args, fmt); vfprintf(stderr, fmt, args); va_end(args); abort(); } RELATED INFORMATION
Functions: fopen(3), printf(3), vwprintf(3), wprintf(3) delim off vprintf(3)

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