X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fstdio%2Ffmemopen.c;h=770fd9953a63274cea74a24a4b1a7dd391c33824;hp=cc72a42056f7d48f2e891b4afb90182f54c2a2d6;hb=400c5e5c8307a2ebe44ef1f203f5a15669f20347;hpb=9dd7d7e3f6a90ae00e83fd98f30c48389c4f5ab2

diff --git a/src/stdio/fmemopen.c b/src/stdio/fmemopen.c
index cc72a420..770fd995 100644
--- a/src/stdio/fmemopen.c
+++ b/src/stdio/fmemopen.c
@@ -1,32 +1,76 @@
-#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)
 {
-	size_t rem = f->memsize - f->mempos;
-	if (len > rem) len = rem;
-	memcpy(buf, f->membuf+f->mempos, len);
-	f->mempos += len;
+	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 ssize_t mwrite(FILE *f, const unsigned char *buf, size_t len)
+static size_t mwrite(FILE *f, const unsigned char *buf, size_t len)
 {
+	struct cookie *c = f->cookie;
 	size_t rem;
-	if (f->memmode == 'a') f->mempos = f->memsize;
-	rem = f->memlim - f->mempos;
+	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(f->membuf+f->mempos, buf, len);
-	f->mempos += len;
-	if (f->mempos >= f->memsize) {
-		f->memsize = f->mempos;
+	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;
 }
 
-FILE *fmemopen(void *buf, size_t size, const char *mode)
+static int mclose(FILE *m)
+{
+	return 0;
+}
+
+FILE *fmemopen(void *restrict buf, size_t size, const char *restrict mode)
 {
 	FILE *f;
+	struct cookie *c;
 	int plus = !!strchr(mode, '+');
 	
 	if (!size || !strchr("rwa", *mode)) {
@@ -39,23 +83,34 @@ FILE *fmemopen(void *buf, size_t size, const char *mode)
 		return 0;
 	}
 
-	f = calloc(sizeof(FILE) + UNGET + BUFSIZ + (buf?0:size), 1);
+	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 *)(f+1) + UNGET;
+	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 == 'a') f->mempos = strchr(buf, 0)-buf;
+	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->flush = mflush;
 	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