ввод символов и строк (input of characters and strings)
Имя (Name)
fgetc, fgets, getc, getchar, ungetc - input of characters and
strings
Синопсис (Synopsis)
#include <stdio.h>
int fgetc(FILE *stream);
int getc(FILE *stream);
int getchar(void);
char *fgets(char *restrict s, int size, FILE *restrict stream);
int ungetc(int c, FILE *stream);
Описание (Description)
fgetc() reads the next character from stream and returns it as an
unsigned char cast to an int, or EOF on end of file or error.
getc() is equivalent to fgetc() except that it may be implemented
as a macro which evaluates stream more than once.
getchar() is equivalent to getc(stdin).
fgets() reads in at most one less than size characters from
stream and stores them into the buffer pointed to by s. Reading
stops after an EOF or a newline. If a newline is read, it is
stored into the buffer. A terminating null byte ('\0') is stored
after the last character in the buffer.
ungetc() pushes c back to stream, cast to unsigned char, where it
is available for subsequent read operations. Pushed-back
characters will be returned in reverse order; only one pushback
is guaranteed.
Calls to the functions described here can be mixed with each
other and with calls to other input functions from the stdio
library for the same input stream.
For nonlocking counterparts, see unlocked_stdio(3).
Возвращаемое значение (Return value)
fgetc(), getc(), and getchar() return the character read as an
unsigned char cast to an int or EOF on end of file or error.
fgets() returns s on success, and NULL on error or when end of
file occurs while no characters have been read.
ungetc() returns c on success, or EOF on error.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│fgetc(), fgets(), getc(), getchar(), │ Thread safety │ MT-Safe │
│ungetc() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008, C89, C99.
It is not advisable to mix calls to input functions from the
stdio library with low-level calls to read(2) for the file
descriptor associated with the input stream; the results will be
undefined and very probably not what you want.
Смотри также (See also)
read(2), write(2), ferror(3), fgetwc(3), fgetws(3), fopen(3),
fread(3), fseek(3), getline(3), gets(3), getwchar(3), puts(3),
scanf(3), ungetwc(3), unlocked_stdio(3), feature_test_macros(7)
