GETC(3) Library Functions Manual GETC(3)

getc — get a byte from a stream

#include <stdio.h>

int getc(FILE *stream);

The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 (“POSIX.1”) defers to the ISO C standard.

The getc () function shall be equivalent to fgetc(3) , except that if it is implemented as a macro it may evaluate stream more than once, so the argument should never be an expression with side effects.

Refer to fgetc(3).

Refer to fgetc(3).

None.

If the integer value returned by getc () is stored into a variable of type char and then compared against the integer constant EOF, the comparison may never succeed, because sign-extension of a variable of type char on widening to integer is implementation-defined.

Since it may be implemented as a macro, getc () may treat incorrectly a stream argument with side effects. In particular, getc (* ++) does not necessarily work as expected. Therefore, use of this function should be preceded by "#undef getc" in such situations; fgetc(3) could also be used.

None.

None.

fgetc(3), the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <stdio.h>

First released in Issue 1. Derived from Issue 1 of the SVID.

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January 1, 2004 posix.fail