std::gets

 

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Defined in header <cstdio>
char* gets(char* str );		(deprecated in C++11) (removed in C++14)

Reads stdin into given character string until a newline character is found or end-of-file occurs.

Parameters

str

-

character string to be written

Return value

str on success, a null pointer on failure.

If the failure has been caused by end of file condition, additionally sets the eof indicator (see std::feof()) on stdin. If the failure has been caused by some other error, sets the error indicator (see std::ferror()) on stdin.

Notes

The std::gets() function does not perform bounds checking. Therefore, this function is extremely vulnerable to buffer-overflow attacks. It cannot be used safely (unless the program runs in an environment which restricts what can appear on stdin). For this reason, the function was deprecated in C++11 and removed altogether in C++14. std::fgets() may be used instead.

Example

Run this code

#include <array>#include <cstdio>#include <cstring>   int main(){std::puts("Never use std::gets(). Use std::fgets() instead!");   std::array<char, 16> buf;   std::printf("Enter a string:\n>");   if(std::fgets(buf.data(), buf.size(), stdin)){constauto len =std::strlen(buf.data());std::printf("The input string:\n[%s] is %s and has the length %li characters.\n", buf.data(), len +1< buf.size()?"not truncated":"truncated", len );}elseif(std::feof(stdin)){std::puts("Error: the end of stdin stream has been reached.");}elseif(std::ferror(stdin)){std::puts("I/O error when reading from stdin.");}else{std::puts("Unknown stdin error.");}}

Possible output:

Never use std::gets(). Use std::fgets() instead! Enter a string: >Living on Earth is expensive, but it does include a free trip around the Sun. The input string: [Living on Earth] is truncated and has the length 15 characters.

See also

scanffscanfsscanf	reads formatted input from stdin, a file stream or a buffer (function)
fgets	gets a character string from a file stream (function)
fputs	writes a character string to a file stream (function)
C documentation for gets