70 lines
1.2 KiB
C
70 lines
1.2 KiB
C
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/* Public domain. */
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#include "buffer.h"
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#include "byte.h"
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#include "error.h"
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static int oneread(int (*op)(),int fd,char *buf,unsigned int len)
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{
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int r;
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for (;;) {
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r = op(fd,buf,len);
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if (r == -1) if (errno == error_intr) continue;
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return r;
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}
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}
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static int getthis(buffer *s,char *buf,unsigned int len)
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{
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if (len > s->p) len = s->p;
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s->p -= len;
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byte_copy(buf,len,s->x + s->n);
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s->n += len;
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return len;
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}
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int buffer_feed(buffer *s)
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{
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int r;
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if (s->p) return s->p;
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r = oneread(s->op,s->fd,s->x,s->n);
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if (r <= 0) return r;
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s->p = r;
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s->n -= r;
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if (s->n > 0) byte_copyr(s->x + s->n,r,s->x);
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return r;
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}
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int buffer_bget(buffer *s,char *buf,unsigned int len)
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{
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int r;
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if (s->p > 0) return getthis(s,buf,len);
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if (s->n <= len) return oneread(s->op,s->fd,buf,s->n);
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r = buffer_feed(s); if (r <= 0) return r;
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return getthis(s,buf,len);
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}
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int buffer_get(buffer *s,char *buf,unsigned int len)
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{
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int r;
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if (s->p > 0) return getthis(s,buf,len);
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if (s->n <= len) return oneread(s->op,s->fd,buf,len);
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r = buffer_feed(s); if (r <= 0) return r;
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return getthis(s,buf,len);
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}
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char *buffer_peek(buffer *s)
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{
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return s->x + s->n;
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}
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void buffer_seek(buffer *s,unsigned int len)
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{
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s->n += len;
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s->p -= len;
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}
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