gets

fgetc, fgets, getc, getchar, gets, ungetc - input of characters and strings

#include <stdio.h>
 I int fgetc(FILE * stream );

I char *fgets(char * s , int  size , FILE * stream );

I int getc(FILE * stream );

I int getchar(void);

I char *gets(char * s );

I int ungetc(int  c , FILE * stream );

R fgetc () reads the next character from stream and returns it as an unsigned char cast to an R int , or EOF on end of file or error.

R getc () is equivalent to R fgetc () except that it may be implemented as a macro which evaluates stream more than once.

R getchar () is equivalent to I getc( stdin ) .

R gets () reads a line from stdin into the buffer pointed to by s until either a terminating newline or R EOF , which it replaces with R '\0' . No check for buffer overrun is performed (see BUGS below).

R fgets () reads in at most one less than size characters from stream and stores them into the buffer pointed to by R s . Reading stops after an EOF or a newline. If a newline is read, it is stored into the buffer. A '\0' is stored after the last character in the buffer.

R ungetc () pushes c back to R stream , cast to R 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 non-locking counterparts, see unlocked_stdio(3).

R fgetc (), R getc () and R getchar () return the character read as an unsigned char cast to an int or EOF on end of file or error.

R gets () and R fgets () return s on success, and NULL on error or when end of file occurs while no characters have been read.

R ungetc () returns c on success, or EOF on error.

C89, C99. LSB deprecates R gets ().

Never use R gets (). Because it is impossible to tell without knowing the data in advance how many characters R gets () will read, and because R gets () will continue to store characters past the end of the buffer, it is extremely dangerous to use. It has been used to break computer security. Use R fgets () instead.

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.

read(2), write(2), ferror(3), fgetwc(3), fgetws(3), fopen(3), fread(3), fseek(3), getline(3), getwchar(3), puts(3), scanf(3), ungetwc(3), unlocked_stdio(3)