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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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36
libc/stdio/fputc.h Normal file
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#ifndef COSMOPOLITAN_LIBC_STDIO_FPUTC_H_
#define COSMOPOLITAN_LIBC_STDIO_FPUTC_H_
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/stdio/internal.h"
#include "libc/stdio/stdio.h"
#include "libc/sysv/consts/o.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
/**
* Writes byte to stream.
*
* @return c (as unsigned char) if written or -1 w/ errno
*/
forceinline int __fputc(int c, FILE *f) {
/* assert((f->iomode & O_ACCMODE) != O_RDONLY); */
if (c != -1) {
unsigned char ch = (unsigned char)c;
f->buf[f->end] = ch;
f->end = (f->end + 1) & (f->size - 1);
if (f->beg == f->end || f->bufmode == _IONBF ||
(f->bufmode == _IOLBF && ch == '\n')) {
if (f->writer) {
return f->writer(f);
} else if (f->beg == f->end) {
return fseteof(f);
}
}
return ch;
} else {
return fseteof(f);
}
}
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_STDIO_FPUTC_H_ */