37 lines
966 B
C
37 lines
966 B
C
#ifndef COSMOPOLITAN_LIBC_STDIO_FPUTC_H_
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#define COSMOPOLITAN_LIBC_STDIO_FPUTC_H_
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#include "libc/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/stdio/internal.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/o.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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/**
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* Writes byte to stream.
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*
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* @return c (as unsigned char) if written or -1 w/ errno
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*/
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forceinline int __fputc(int c, FILE *f) {
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/* assert((f->iomode & O_ACCMODE) != O_RDONLY); */
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if (c != -1) {
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unsigned char ch = (unsigned char)c;
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f->buf[f->end] = ch;
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f->end = (f->end + 1) & (f->size - 1);
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if (f->beg == f->end || f->bufmode == _IONBF ||
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(f->bufmode == _IOLBF && ch == '\n')) {
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if (f->writer) {
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return f->writer(f);
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} else if (f->beg == f->end) {
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return fseteof(f);
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}
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}
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return ch;
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} else {
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return fseteof(f);
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}
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}
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_STDIO_FPUTC_H_ */
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