-#if 0
#include "stdio_impl.h"
-static ssize_t mread(FILE *f, unsigned char *buf, size_t len)
+struct cookie {
+ size_t pos, len, size;
+ unsigned char *buf;
+ int mode;
+};
+
+static off_t mseek(FILE *f, off_t off, int whence)
{
- memcpy(buf,
+ ssize_t base;
+ struct cookie *c = f->cookie;
+ if (whence>2U) {
+fail:
+ errno = EINVAL;
+ return -1;
+ }
+ base = (size_t [3]){0, c->pos, c->len}[whence];
+ if (off < -base || off > (ssize_t)c->size-base) goto fail;
+ return c->pos = base+off;
+}
+
+static size_t mread(FILE *f, unsigned char *buf, size_t len)
+{
+ struct cookie *c = f->cookie;
+ size_t rem = c->len - c->pos;
+ if (c->pos > c->len) rem = 0;
+ if (len > rem) {
+ len = rem;
+ f->flags |= F_EOF;
+ }
+ memcpy(buf, c->buf+c->pos, len);
+ c->pos += len;
+ rem -= len;
+ if (rem > f->buf_size) rem = f->buf_size;
+ f->rpos = f->buf;
+ f->rend = f->buf + rem;
+ memcpy(f->rpos, c->buf+c->pos, rem);
+ c->pos += rem;
+ return len;
+}
+
+static size_t mwrite(FILE *f, const unsigned char *buf, size_t len)
+{
+ struct cookie *c = f->cookie;
+ size_t rem;
+ size_t len2 = f->wpos - f->wbase;
+ if (len2) {
+ f->wpos = f->wbase;
+ if (mwrite(f, f->wpos, len2) < len2) return 0;
+ }
+ if (c->mode == 'a') c->pos = c->len;
+ rem = c->size - c->pos;
+ if (len > rem) len = rem;
+ memcpy(c->buf+c->pos, buf, len);
+ c->pos += len;
+ if (c->pos > c->len) {
+ c->len = c->pos;
+ if (c->len < c->size) c->buf[c->len] = 0;
+ else if ((f->flags&F_NORD) && c->size) c->buf[c->size-1] = 0;
+ }
+ return len;
+}
+
+static int mclose(FILE *m)
+{
+ return 0;
}
FILE *fmemopen(void *buf, size_t size, const char *mode)
{
- FILE *f = calloc(sizeof(FILE), 1);
+ FILE *f;
+ struct cookie *c;
+ int plus = !!strchr(mode, '+');
+
+ if (!size || !strchr("rwa", *mode)) {
+ errno = EINVAL;
+ return 0;
+ }
+
+ if (!buf && size > SIZE_MAX-sizeof(FILE)-BUFSIZ-UNGET) {
+ errno = ENOMEM;
+ return 0;
+ }
+
+ f = calloc(sizeof *f + sizeof *c + UNGET + BUFSIZ + (buf?0:size), 1);
if (!f) return 0;
+ f->cookie = c = (void *)(f+1);
+ f->fd = -1;
+ f->lbf = EOF;
+ f->buf = (unsigned char *)(c+1) + UNGET;
+ f->buf_size = BUFSIZ;
+ if (!buf) buf = f->buf + BUFSIZ;
+
+ c->buf = buf;
+ c->size = size;
+ c->mode = *mode;
- //
+ if (!plus) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
+ if (*mode == 'r') c->len = size;
+ else if (*mode == 'a') c->len = c->pos = strnlen(buf, size);
+
+ f->read = mread;
+ f->write = mwrite;
+ f->seek = mseek;
+ f->close = mclose;
+
+ if (!libc.threaded) {
+ f->lock = -1;
+ f->next = libc.ofl_head;
+ if (libc.ofl_head) libc.ofl_head->prev = f;
+ libc.ofl_head = f;
+ }
+
+ return f;
}
-#endif