SNPRINTF(9) Basic C Library Functions SNPRINTF(9)NAME
snprintf - Format a string and place it in a buffer
SYNOPSIS
int snprintf(char * buf, size_t size, const char * fmt, ...);
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 @...: Arguments for the format string
...
variable arguments
DESCRIPTION
The return value is the number of characters which would be generated for the given input, excluding the trailing null, as per ISO C99. If
the return is greater than or equal to size, the resulting string is truncated.
See the vsnprintf documentation for format string extensions over C99.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SNPRINTF(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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