duck@duck ~/c $ gcc -o sn snprintf.c snprintf.c: In function ‘main’:snprintf.c:8: warning: '0' flag used with ‘%s’ gnu_printf format snprintf.c:8: warning: '0' flag used with ‘%s’ gnu_printf format duck@duck ~/c $ ./sn 1234 --- 由上面的输出看到左边补的...
If the function takes a wchar_t buffer, the size specifies the number of 16-bit words. Let len be the size of the formatted data. If the function takes a char buffer, the size is in bytes. If the function takes a wchar_t buffer, the size specifies the number of 16...
Even though %c expects int argument, it is safe to pass a char because of the integer promotion that takes place when a variadic function is called. The correct conversion specifications for the fixed-width character types (int8_t, etc) are defined in the header <inttypes.h> (although ...
5-8) Same as (1-4), except that the following errors are detected at runtime and call the currently installed constraint handler function: the conversion specifier %n is present in format any of the arguments corresponding to %s is a null pointer stream or format or buffer is a null...
Even though %c expects int argument, it is safe to pass a char because of the integer promotion that takes place when a variadic function is called. The correct conversion specifications for the fixed-width character types (int8_t, etc) are defined in the header <cinttypes>(C++) or <...
The _snprintf function formats and stores count or fewer characters in buffer, and appends a terminating null character if the formatted string length is strictly less than count characters. Each argument (if any) is converted and is output according to the corresponding format specification in...
Stores formatted output in a string buffer #include <stdio.h> intsnprintf( char * restrict dest, size_t n, const char * restrict format, ... ); The snprintf() function is similar to printf(), but writes its output as a string in the buffer referenced by the first pointer argument,...
2707 i等于vsnprintf - Format a string and place it in a buffer*@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* This function generally ...
-Letlenbe the size of the formatted data. If the function takes acharbuffer, the size is in bytes. If the function takes awchar_tbuffer, the size specifies the number of 16-bit words. Characters refer tocharcharacters for functions that take acharbuffer, and towchar_tcharacters for functio...
normally calling fgets, strncat, and strncpy instead. Even better are the more recently available function strlcat and strlcpy, which ensure the result is a properly terminated string. Additional tips on writing secure network programs are found in Chapter 23 of [Garfinkel, Schwartz, and Spafford ...