mirror of
https://github.com/fluencelabs/musl
synced 2025-05-02 18:42:15 +00:00
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
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#include "stdio_impl.h"
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static int overflow(FILE *f, int c)
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{
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/* Initialize if we're not already writing */
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if (!f->wend) {
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/* Fail if we're in error state or unwritable. */
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if (f->flags & (F_ERR|F_NOWR)) return EOF;
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/* Set byte orientation -1,0=>-1; 1=>1 */
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f->mode |= f->mode-1;
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/* Clear read buffer (easier than summoning nasal demons) */
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f->rpos = f->rend = f->rstop = 0;
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/* Activate write through the buffer */
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f->wpos = f->wbase = f->buf;
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f->wend = f->buf + f->buf_size;
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f->wstop = (f->lbf < 0) ? f->wend - 1 : 0;
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}
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/* Buffer can always hold at least 1 byte... */
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if (c != EOF) {
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*f->wpos++ = c;
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if (f->wpos <= f->wstop && c != f->lbf) return c;
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}
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/* ...since if the next call fails, buffer is empty. */
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if (f->write(f, f->wbase, f->wpos - f->wbase) < 0) {
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f->flags |= F_ERR;
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f->wpos = f->wbase = f->wend = f->wstop = 0;
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return EOF;
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}
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/* Buffer is empty so reset position to beginning */
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f->wpos = f->wbase;
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return c;
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}
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int __overflow(FILE *f, int c)
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{
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return overflow(f, c & 0xff);
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}
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int __oflow(FILE *f)
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{
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overflow(f, EOF);
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return (f->flags & F_ERR) ? EOF : 0;
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}
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/* Link flush-on-exit code iff any stdio write functions are linked. */
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int (*const __fflush_on_exit)(FILE *) = fflush;
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