X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fstdio%2Ffmemopen.c;h=f518528fe2086ac2f563aeb7a4e81e5812e86913;hp=77a60746660b79a3e1a6b23caab38ec49ca8a5c0;hb=d4fa6f0e08ff5a292d2aeeeeda80670a1a082cae;hpb=0b44a0315b47dd8eced9f3b7f31580cf14bbfc01

diff --git a/src/stdio/fmemopen.c b/src/stdio/fmemopen.c
index 77a60746..f518528f 100644
--- a/src/stdio/fmemopen.c
+++ b/src/stdio/fmemopen.c
@@ -1,16 +1,109 @@
-#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_MAX-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->size - c->pos;
+	if (len > rem) len = rem;
+	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);
+	if (!len) f->flags |= F_EOF;
+	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->size;
+	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;
+	c->buf[c->len==c->size ? c->len-1 : c->len] = 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