X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fstdio%2Ffmemopen.c;h=5685092e36018247bb7308bbce5db18416b8b3f9;hb=97d35a552ec5b6ddf7923dd2f9a8eb973526acea;hp=77a60746660b79a3e1a6b23caab38ec49ca8a5c0;hpb=0b44a0315b47dd8eced9f3b7f31580cf14bbfc01;p=musl

diff --git a/src/stdio/fmemopen.c b/src/stdio/fmemopen.c
index 77a60746..5685092e 100644
--- a/src/stdio/fmemopen.c
+++ b/src/stdio/fmemopen.c
@@ -1,16 +1,127 @@
-#if 0
 #include "stdio_impl.h"
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include "libc.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;
+};
+
+struct mem_FILE {
+	FILE f;
+	struct cookie c;
+	unsigned char buf[UNGET+BUFSIZ], buf2[];
+};
+
+static off_t mseek(FILE *f, off_t off, int whence)
+{
+	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)
 {
-	memcpy(buf, 
+	return 0;
 }
 
-FILE *fmemopen(void *buf, size_t size, const char *mode)
+FILE *fmemopen(void *restrict buf, size_t size, const char *restrict mode)
 {
-	FILE *f = calloc(sizeof(FILE), 1);
+	struct mem_FILE *f;
+	int plus = !!strchr(mode, '+');
+	
+	if (!strchr("rwa", *mode)) {
+		errno = EINVAL;
+		return 0;
+	}
+
+	if (!buf && size > PTRDIFF_MAX) {
+		errno = ENOMEM;
+		return 0;
+	}
+
+	f = malloc(sizeof *f + (buf?0:size));
 	if (!f) return 0;
+	memset(&f->f, 0, sizeof f->f);
+	f->f.cookie = &f->c;
+	f->f.fd = -1;
+	f->f.lbf = EOF;
+	f->f.buf = f->buf + UNGET;
+	f->f.buf_size = sizeof f->buf - UNGET;
+	if (!buf) {
+		buf = f->buf2;;
+		memset(buf, 0, size);
+	}
+
+	memset(&f->c, 0, sizeof f->c);
+	f->c.buf = buf;
+	f->c.size = size;
+	f->c.mode = *mode;
 	
-	//
+	if (!plus) f->f.flags = (*mode == 'r') ? F_NOWR : F_NORD;
+	if (*mode == 'r') f->c.len = size;
+	else if (*mode == 'a') f->c.len = f->c.pos = strnlen(buf, size);
+	else if (plus) *f->c.buf = 0;
+
+	f->f.read = mread;
+	f->f.write = mwrite;
+	f->f.seek = mseek;
+	f->f.close = mclose;
+
+	if (!libc.threaded) f->f.lock = -1;
+
+	return __ofl_add(&f->f);
 }
-#endif