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Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
From 061843340fbf2493bb615e20e66f60c5d1ef0455 Mon Sep 17 00:00:00 2001
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
From: William Pitcock <nenolod@dereferenced.org>
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
Date: Tue, 5 Dec 2017 16:04:43 -0500
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
Subject: implement the fopencookie extension to stdio
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notes added by maintainer:
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this function is a GNU extension. it was chosen over the similar BSD
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function funopen because the latter depends on fpos_t being an
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arithmetic type as part of its public API, conflicting with our
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definition of fpos_t and with the intent that it be an opaque type. it
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was accepted for inclusion because, despite not being widely used, it
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
is usually very difficult to extricate software using it from the
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dependency on it.
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calling pattern for the read and write callbacks is not likely to
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match glibc or other implementations, but should work with any
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
reasonable callbacks. in particular the read function is never called
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without at least one byte being needed to satisfy its caller, so that
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spurious blocking is not introduced.
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Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
contracts for what callbacks called from inside libc/stdio can do are
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always complicated, and at some point still need to be specified
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explicitly. at the very least, the callbacks must return or block
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indefinitely (they cannot perform nonlocal exits) and they should not
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make calls to stdio using their own FILE as an argument.
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---
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 include/stdio.h         |  14 +++++
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 src/stdio/fopencookie.c | 138 ++++++++++++++++++++++++++++++++++++++++++++++++
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 2 files changed, 152 insertions(+)
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 create mode 100644 src/stdio/fopencookie.c
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diff --git a/include/stdio.h b/include/stdio.h
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index 884d2e6..2932c76 100644
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--- a/include/stdio.h
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+++ b/include/stdio.h
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@@ -182,6 +182,20 @@ int vasprintf(char **, const char *, __isoc_va_list);
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 #ifdef _GNU_SOURCE
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 char *fgets_unlocked(char *, int, FILE *);
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 int fputs_unlocked(const char *, FILE *);
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+
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+typedef ssize_t (cookie_read_function_t)(void *, char *, size_t);
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+typedef ssize_t (cookie_write_function_t)(void *, const char *, size_t);
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+typedef int (cookie_seek_function_t)(void *, off_t *, int);
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+typedef int (cookie_close_function_t)(void *);
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+
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+typedef struct {
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+	cookie_read_function_t *read;
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+	cookie_write_function_t *write;
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+	cookie_seek_function_t *seek;
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+	cookie_close_function_t *close;
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+} cookie_io_functions_t;
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+
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+FILE *fopencookie(void *, const char *, cookie_io_functions_t);
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 #endif
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 #if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
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diff --git a/src/stdio/fopencookie.c b/src/stdio/fopencookie.c
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new file mode 100644
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index 0000000..2f46dd5
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--- /dev/null
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+++ b/src/stdio/fopencookie.c
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@@ -0,0 +1,138 @@
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+#define _GNU_SOURCE
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+#include "stdio_impl.h"
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+#include <stdlib.h>
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+#include <sys/ioctl.h>
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+#include <fcntl.h>
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+#include <errno.h>
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+#include <string.h>
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+
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+struct fcookie {
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+	void *cookie;
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+	cookie_io_functions_t iofuncs;
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+};
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+
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+struct cookie_FILE {
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+	FILE f;
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+	struct fcookie fc;
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+	unsigned char buf[UNGET+BUFSIZ];
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+};
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+
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+static size_t cookieread(FILE *f, unsigned char *buf, size_t len)
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+{
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+	struct fcookie *fc = f->cookie;
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+	ssize_t ret = -1;
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+	size_t remain = len, readlen = 0;
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+	size_t len2 = len - !!f->buf_size;
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+
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+	if (!fc->iofuncs.read) goto bail;
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+
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+	if (len2) {
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+		ret = fc->iofuncs.read(fc->cookie, (char *) buf, len2);
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+		if (ret <= 0) goto bail;
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+
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+		readlen += ret;
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+		remain -= ret;
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+	}
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+
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+	if (!f->buf_size || remain > !!f->buf_size) return readlen;
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+
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+	f->rpos = f->buf;
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+	ret = fc->iofuncs.read(fc->cookie, (char *) f->rpos, f->buf_size);
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+	if (ret <= 0) goto bail;
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+	f->rend = f->rpos + ret;
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+
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+	buf[readlen++] = *f->rpos++;
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+
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+	return readlen;
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+
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+bail:
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+	f->flags |= ret == 0 ? F_EOF : F_ERR;
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+	f->rpos = f->rend = f->buf;
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+	return readlen;
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+}
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+
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+static size_t cookiewrite(FILE *f, const unsigned char *buf, size_t len)
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+{
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+	struct fcookie *fc = f->cookie;
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+	ssize_t ret;
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+	size_t len2 = f->wpos - f->wbase;
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+	if (!fc->iofuncs.write) return len;
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+	if (len2) {
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+		f->wpos = f->wbase;
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+		if (cookiewrite(f, f->wpos, len2) < len2) return 0;
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+	}
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	ret = fc->iofuncs.write(fc->cookie, (const char *) buf, len);
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+	if (ret < 0) {
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+		f->wpos = f->wbase = f->wend = 0;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+		f->flags |= F_ERR;
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+		return 0;
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+	}
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+	return ret;
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+}
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+
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+static off_t cookieseek(FILE *f, off_t off, int whence)
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+{
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+	struct fcookie *fc = f->cookie;
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+	int res;
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+	if (whence > 2U) {
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+		errno = EINVAL;
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+		return -1;
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+	}
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	if (!fc->iofuncs.seek) {
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+		errno = ENOTSUP;
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+		return -1;
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+	}
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	res = fc->iofuncs.seek(fc->cookie, &off, whence);
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	if (res < 0)
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+		return res;
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+	return off;
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+}
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+
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+static int cookieclose(FILE *f)
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+{
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+	struct fcookie *fc = f->cookie;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	if (fc->iofuncs.close) return fc->iofuncs.close(fc->cookie);
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+	return 0;
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+}
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+
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+FILE *fopencookie(void *cookie, const char *mode, cookie_io_functions_t iofuncs)
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+{
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+	struct cookie_FILE *f;
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+
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	/* Check for valid initial mode character */
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	if (!strchr("rwa", *mode)) {
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+		errno = EINVAL;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+		return 0;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	}
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+
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	/* Allocate FILE+fcookie+buffer or fail */
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	if (!(f=malloc(sizeof *f))) return 0;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	/* Zero-fill only the struct, not the buffer */
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	memset(&f->f, 0, sizeof f->f);
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	/* Impose mode restrictions */
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	if (!strchr(mode, '+')) f->f.flags = (*mode == 'r') ? F_NOWR : F_NORD;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	/* Set up our fcookie */
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->fc.cookie = cookie;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->fc.iofuncs.read = iofuncs.read;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->fc.iofuncs.write = iofuncs.write;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->fc.iofuncs.seek = iofuncs.seek;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->fc.iofuncs.close = iofuncs.close;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->f.fd = -1;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->f.cookie = &f->fc;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->f.buf = f->buf + UNGET;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->f.buf_size = BUFSIZ;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->f.lbf = EOF;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	/* Initialize op ptrs. No problem if some are unneeded. */
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->f.read = cookieread;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->f.write = cookiewrite;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->f.seek = cookieseek;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	f->f.close = cookieclose;
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	/* Add new FILE to open file list */
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+	return __ofl_add(&f->f);
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
+}
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
-- 
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5
cgit v0.11.2
Lucio Andrés Illanes Albornoz (arab, vxp) ff26b5