sscanf_s() Function in C

3. fscanf_s() Function in C

sscanf_s() is secure function of sscanf() and secure functions require the size of each c, C, s, S and [ type field to be passed as an argument immediately following the variable.

Syntax

int sscanf_s(const char *restrict buffer, const char *restrict format, ...);

Parameters

str: string used to retrieve data
format: string that contains the type specifier(s)
… (ellipsis): It indicates that the function accepts a variable number of arguments.

Note: sscanf_s has an extra parameter to specify the buffer size and actually control the limit of the input.

Return Value

On success, the function returns the number of values read successfully.
In the case of an input failure, before any data could be successfully read, EOF is returned.

Note: sscanf_s() will only work in Microsoft Visual Studio.

Example: C Program to Illustrate sscanf_s Function

C

// C program to illustrate sscanf_s statement
// This program will run on MS Visual studio
#include <stdio.h>
 
int main()
{
    char s[] = "3 red balls 2 blue balls";
    char str[10], str2[10];
    int i;
 
    // %*s is used to skip a word
    sscanf_s(s, "%d", &i, sizeof(i));
    sscanf_s(s, "%*d %*s %*s %*s %s", str, sizeof(str));
    sscanf_s(s, "%*d %*s %*s %*s %*s %s", str2,
             sizeof(str2));
 
    printf("%d %s %s \n", i, str, str2);
 
    return 0;
}

Output

3 blue balls

Inbuilt library functions for user Input | sscanf, scanf_s, fscanf_s, sscanf_s

The C Programming Language provides various Inbuilt Library Functions for User Input. In this article, we will learn about sscanf, scanf_s, fscanf_s, sscanf_s Library Functions in C.

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