835f9f950e
this header evolved to facilitate the extremely lazy practice of omitting explicit includes of the necessary headers in individual stdio source files; not only was this sloppy, but it also increased build time. now, stdio_impl.h is only including the headers it needs for its own use; any further headers needed by source files are included directly where needed.
37 lines
822 B
C
37 lines
822 B
C
#include "stdio_impl.h"
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#include <sys/uio.h>
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#include <pthread.h>
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static void cleanup(void *p)
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{
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FILE *f = p;
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if (!f->lockcount) __unlockfile(f);
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}
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size_t __stdio_read(FILE *f, unsigned char *buf, size_t len)
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{
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struct iovec iov[2] = {
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{ .iov_base = buf, .iov_len = len - !!f->buf_size },
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{ .iov_base = f->buf, .iov_len = f->buf_size }
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};
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ssize_t cnt;
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if (libc.main_thread) {
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pthread_cleanup_push(cleanup, f);
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cnt = syscall_cp(SYS_readv, f->fd, iov, 2);
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pthread_cleanup_pop(0);
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} else {
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cnt = syscall(SYS_readv, f->fd, iov, 2);
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}
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if (cnt <= 0) {
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f->flags |= F_EOF ^ ((F_ERR^F_EOF) & cnt);
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f->rpos = f->rend = 0;
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return cnt;
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}
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if (cnt <= iov[0].iov_len) return cnt;
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cnt -= iov[0].iov_len;
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f->rpos = f->buf;
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f->rend = f->buf + cnt;
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if (f->buf_size) buf[len-1] = *f->rpos++;
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return len;
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}
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