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#include <assert.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "iobuf.h"
#include "subr.h"
struct iobuf
iobuf_init(size_t size)
{
struct iobuf iob;
iob.size = size;
iob.off = 0;
iob.skip = 0;
iob.error = (iob.buf = malloc(size)) == NULL ? 1 : 0;
return iob;
}
void
iobuf_free(struct iobuf *iob)
{
if (iob->buf != NULL)
free(iob->buf - iob->skip);
iob->buf = NULL;
iob->error = 1;
}
void
iobuf_consumed(struct iobuf *iob, size_t count)
{
if (iob->error)
return;
assert(count <= iob->off);
iob->skip += count;
iob->buf += count;
iob->off -= count;
}
int
iobuf_accommodate(struct iobuf *iob, size_t count)
{
if (iob->error)
return 0;
size_t esize = iob->size - (iob->skip + iob->off);
if (esize >= count)
return 1;
else if (esize + iob->skip >= count) {
bcopy(iob->buf, iob->buf - iob->skip, iob->off);
iob->buf -= iob->skip;
iob->skip = 0;
return 1;
} else {
uint8_t *nbuf = realloc(iob->buf - iob->skip, iob->size + count);
if (nbuf == NULL) {
iob->error = 1;
return 0;
}
iob->buf = nbuf + iob->skip;
iob->size += count;
return 1;
}
}
int
iobuf_print(struct iobuf *iob, const char *fmt, ...)
{
if (iob->error)
return 0;
int np;
va_list ap;
va_start(ap, fmt);
np = vsnprintf(NULL, 0, fmt, ap);
va_end(ap);
if (!iobuf_accommodate(iob, np + 1))
return 0;
va_start(ap, fmt);
vsnprintf(iob->buf + iob->off, np + 1, fmt, ap);
va_end(ap);
iob->off += np;
return 1;
}
int
iobuf_write(struct iobuf *iob, const void *buf, size_t count)
{
if (iob->error)
return 0;
if (!iobuf_accommodate(iob, count))
return 0;
bcopy(buf, iob->buf + iob->off, count);
iob->off += count;
return 1;
}
void *
iobuf_find(struct iobuf *iob, const void *p, size_t plen)
{
return iob->error ? NULL : memfind(p, plen, iob->buf, iob->off);
}
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