getc — get a byte from a stream
#include <stdio.h>
int getc(FILE *stream);
[CX] 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 POSIX.1-2024 defers to the ISO C standard.The getc() function shall be equivalent to fgetc , 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 .
Refer to fgetc .
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(*f++) does not necessarily work as expected. Therefore, use of this function should be preceded by "#undef getc" in such situations; fgetc() could also be used.
None.
None.
2.5 Standard I/O Streams , fgetc
XBD <stdio.h>
First released in Issue 1. Derived from Issue 1 of the SVID.
POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0231 [14] is applied.
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