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cc65/libsrc/common/fputc.c
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531 B
C

/*
* fputc.c
*
* Ullrich von Bassewitz, 02.06.1998
*/
#include <stdio.h>
#include <fcntl.h>
#include "_file.h"
int fputc (int c, FILE* f)
{
/* Check if the file is open or if there is an error condition */
if ((f->f_flags & _FOPEN) == 0 || (f->f_flags & (_FERROR | _FEOF)) != 0) {
return -1;
}
/* Write the byte (knows about byte order!) */
if (write (f->f_fd, &c, 1) <= 0) {
/* Error */
f->f_flags |= _FERROR;
return -1;
}
/* Return the byte written */
return c & 0xFF;
}