fgetws - Linux
Overview
fgetws
is a library function in the C standard library used to read a line of text from a stream. It is typically employed for reading input from a file or a terminal device.
Syntax
#include <stdio.h>
wchar_t *fgetws(wchar_t *str, int num, FILE *stream);
where:
str
: Pointer to a buffer where the input line will be storednum
: Maximum number of characters (excluding the null terminator) to readstream
: Pointer to the file or terminal device to read from
Options/Flags
None.
Examples
Example 1: Reading a line from a file
#include <stdio.h>
int main() {
FILE *fp = fopen("myfile.txt", "r");
wchar_t line[1024];
while (fgetws(line, sizeof(line), fp)) {
// Do something with the line
}
fclose(fp);
return 0;
}
Example 2: Reading input from the terminal
#include <stdio.h>
int main() {
wchar_t line[1024];
while (fgetws(line, sizeof(line), stdin)) {
// Do something with the line
}
return 0;
}
Common Issues
- Buffer Overflow: Ensure that the buffer provided is large enough to hold the entire line of text.
- End-of-File: When attempting to read from an empty file or terminal,
fgetws
will returnNULL
.
Integration
fgetws
can be used in combination with other functions such as fgets
for reading text lines in different encodings or with getline
for reading variable-length lines.
Related Commands
fgets
: Reads a line of text in UTF-8 encodinggetline
: A more versatile function for reading variable-length linesscanf
: A formatted input function that can be used to read specific types of data from a stream