FGETC(3) Linux Programmer's Manual FGETC(3)
fgetc, fgets, getc, getchar, ungetc - input of characters and strings
int fgetc(FILE *stream);
char *fgets(char *s, int size, FILE *stream);
int getc(FILE *stream);
int ungetc(int c, FILE *stream);
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
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
For nonlocking counterparts, see unlocked_stdio(3).
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.
C89, C99, POSIX.1-2001.
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 associ-
ated with the input stream; the results will be undefined and very
probably not what you want.
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)
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GNU 2013-12-31 FGETC(3)