libudev: move to top-level directory

1 files changed, 502 insertions, 0 deletions

diff --git a/libudev/libudev-util.c b/libudev/libudev-util.c
new file mode 100644
index 0000000000..dcc4a0fd16
--- /dev/null
+++ b/libudev/libudev-util.c
@@ -0,0 +1,502 @@
+/*
+ * libudev - interface to udev device information
+ *
+ * Copyright (C) 2008-2009 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <dirent.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#include "libudev.h"
+#include "libudev-private.h"
+
+static ssize_t get_sys_link(struct udev *udev, const char *slink, const char *syspath, char *value, size_t size)
+{
+	char path[UTIL_PATH_SIZE];
+	ssize_t len;
+	const char *pos;
+
+	util_strscpyl(path, sizeof(path), syspath, "/", slink, NULL);
+	len = readlink(path, path, sizeof(path));
+	if (len < 0 || len >= (ssize_t) sizeof(path))
+		return -1;
+	path[len] = '\0';
+	pos = strrchr(path, '/');
+	if (pos == NULL)
+		return -1;
+	pos = &pos[1];
+	dbg(udev, "resolved link to: '%s'\n", pos);
+	return util_strscpy(value, size, pos);
+}
+
+ssize_t util_get_sys_subsystem(struct udev *udev, const char *syspath, char *subsystem, size_t size)
+{
+	return get_sys_link(udev, "subsystem", syspath, subsystem, size);
+}
+
+ssize_t util_get_sys_driver(struct udev *udev, const char *syspath, char *driver, size_t size)
+{
+	return get_sys_link(udev, "driver", syspath, driver, size);
+}
+
+int util_resolve_sys_link(struct udev *udev, char *syspath, size_t size)
+{
+	char link_target[UTIL_PATH_SIZE];
+
+	int len;
+	int i;
+	int back;
+	char *base;
+
+	len = readlink(syspath, link_target, sizeof(link_target));
+	if (len <= 0)
+		return -1;
+	link_target[len] = '\0';
+	dbg(udev, "path link '%s' points to '%s'\n", syspath, link_target);
+
+	for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
+		;
+	dbg(udev, "base '%s', tail '%s', back %i\n", syspath, &link_target[back * 3], back);
+	for (i = 0; i <= back; i++) {
+		base = strrchr(syspath, '/');
+		if (base == NULL)
+			return -1;
+		base[0] = '\0';
+	}
+	dbg(udev, "after moving back '%s'\n", syspath);
+	util_strscpyl(base, size - (base - syspath), "/", &link_target[back * 3], NULL);
+	return 0;
+}
+
+int util_log_priority(const char *priority)
+{
+	char *endptr;
+	int prio;
+
+	prio = strtol(priority, &endptr, 10);
+	if (endptr[0] == '\0')
+		return prio;
+	if (strncmp(priority, "err", 3) == 0)
+		return LOG_ERR;
+	if (strcmp(priority, "info") == 0)
+		return LOG_INFO;
+	if (strcmp(priority, "debug") == 0)
+		return LOG_DEBUG;
+	return 0;
+}
+
+size_t util_path_encode(const char *src, char *dest, size_t size)
+{
+	size_t i, j;
+
+	for (i = 0, j = 0; src[i] != '\0'; i++) {
+		if (src[i] == '/') {
+			if (j+4 >= size) {
+				j = 0;
+				break;
+			}
+			memcpy(&dest[j], "\\x2f", 4);
+			j += 4;
+		} else if (src[i] == '\\') {
+			if (j+4 >= size) {
+				j = 0;
+				break;
+			}
+			memcpy(&dest[j], "\\x5c", 4);
+			j += 4;
+		} else {
+			if (j+1 >= size) {
+				j = 0;
+				break;
+			}
+			dest[j] = src[i];
+			j++;
+		}
+	}
+	dest[j] = '\0';
+	return j;
+}
+
+size_t util_path_decode(char *s)
+{
+	size_t i, j;
+
+	for (i = 0, j = 0; s[i] != '\0'; j++) {
+		if (memcmp(&s[i], "\\x2f", 4) == 0) {
+			s[j] = '/';
+			i += 4;
+		} else if (memcmp(&s[i], "\\x5c", 4) == 0) {
+			s[j] = '\\';
+			i += 4;
+		} else {
+			s[j] = s[i];
+			i++;
+		}
+	}
+	s[j] = '\0';
+	return j;
+}
+
+void util_remove_trailing_chars(char *path, char c)
+{
+	size_t len;
+
+	if (path == NULL)
+		return;
+	len = strlen(path);
+	while (len > 0 && path[len-1] == c)
+		path[--len] = '\0';
+}
+
+/*
+ * Concatenates strings. In any case, terminates in _all_ cases with '\0'
+ * and moves the @dest pointer forward to the added '\0'. Returns the
+ * remaining size, and 0 if the string was truncated.
+ */
+size_t util_strpcpy(char **dest, size_t size, const char *src)
+{
+	size_t len;
+
+	len = strlen(src);
+	if (len >= size) {
+		if (size > 1)
+			*dest = mempcpy(*dest, src, size-1);
+		size = 0;
+		*dest[0] = '\0';
+	} else {
+		if (len > 0) {
+			*dest = mempcpy(*dest, src, len);
+			size -= len;
+		}
+		*dest[0] = '\0';
+	}
+	return size;
+}
+
+/* concatenates list of strings, moves dest forward */
+size_t util_strpcpyl(char **dest, size_t size, const char *src, ...)
+{
+	va_list va;
+
+	va_start(va, src);
+	do {
+		size = util_strpcpy(dest, size, src);
+		src = va_arg(va, char *);
+	} while (src != NULL);
+	va_end(va);
+
+	return size;
+}
+
+/* copies string */
+size_t util_strscpy(char *dest, size_t size, const char *src)
+{
+	char *s;
+
+	s = dest;
+	return util_strpcpy(&s, size, src);
+}
+
+/* concatenates list of strings */
+size_t util_strscpyl(char *dest, size_t size, const char *src, ...)
+{
+	va_list va;
+	char *s;
+
+	va_start(va, src);
+	s = dest;
+	do {
+		size = util_strpcpy(&s, size, src);
+		src = va_arg(va, char *);
+	} while (src != NULL);
+	va_end(va);
+
+	return size;
+}
+
+/* count of characters used to encode one unicode char */
+static int utf8_encoded_expected_len(const char *str)
+{
+	unsigned char c = (unsigned char)str[0];
+
+	if (c < 0x80)
+		return 1;
+	if ((c & 0xe0) == 0xc0)
+		return 2;
+	if ((c & 0xf0) == 0xe0)
+		return 3;
+	if ((c & 0xf8) == 0xf0)
+		return 4;
+	if ((c & 0xfc) == 0xf8)
+		return 5;
+	if ((c & 0xfe) == 0xfc)
+		return 6;
+	return 0;
+}
+
+/* decode one unicode char */
+static int utf8_encoded_to_unichar(const char *str)
+{
+	int unichar;
+	int len;
+	int i;
+
+	len = utf8_encoded_expected_len(str);
+	switch (len) {
+	case 1:
+		return (int)str[0];
+	case 2:
+		unichar = str[0] & 0x1f;
+		break;
+	case 3:
+		unichar = (int)str[0] & 0x0f;
+		break;
+	case 4:
+		unichar = (int)str[0] & 0x07;
+		break;
+	case 5:
+		unichar = (int)str[0] & 0x03;
+		break;
+	case 6:
+		unichar = (int)str[0] & 0x01;
+		break;
+	default:
+		return -1;
+	}
+
+	for (i = 1; i < len; i++) {
+		if (((int)str[i] & 0xc0) != 0x80)
+			return -1;
+		unichar <<= 6;
+		unichar |= (int)str[i] & 0x3f;
+	}
+
+	return unichar;
+}
+
+/* expected size used to encode one unicode char */
+static int utf8_unichar_to_encoded_len(int unichar)
+{
+	if (unichar < 0x80)
+		return 1;
+	if (unichar < 0x800)
+		return 2;
+	if (unichar < 0x10000)
+		return 3;
+	if (unichar < 0x200000)
+		return 4;
+	if (unichar < 0x4000000)
+		return 5;
+	return 6;
+}
+
+/* check if unicode char has a valid numeric range */
+static int utf8_unichar_valid_range(int unichar)
+{
+	if (unichar > 0x10ffff)
+		return 0;
+	if ((unichar & 0xfffff800) == 0xd800)
+		return 0;
+	if ((unichar > 0xfdcf) && (unichar < 0xfdf0))
+		return 0;
+	if ((unichar & 0xffff) == 0xffff)
+		return 0;
+	return 1;
+}
+
+/* validate one encoded unicode char and return its length */
+static int utf8_encoded_valid_unichar(const char *str)
+{
+	int len;
+	int unichar;
+	int i;
+
+	len = utf8_encoded_expected_len(str);
+	if (len == 0)
+		return -1;
+
+	/* ascii is valid */
+	if (len == 1)
+		return 1;
+
+	/* check if expected encoded chars are available */
+	for (i = 0; i < len; i++)
+		if ((str[i] & 0x80) != 0x80)
+			return -1;
+
+	unichar = utf8_encoded_to_unichar(str);
+
+	/* check if encoded length matches encoded value */
+	if (utf8_unichar_to_encoded_len(unichar) != len)
+		return -1;
+
+	/* check if value has valid range */
+	if (!utf8_unichar_valid_range(unichar))
+		return -1;
+
+	return len;
+}
+
+int udev_util_replace_whitespace(const char *str, char *to, size_t len)
+{
+	size_t i, j;
+
+	/* strip trailing whitespace */
+	len = strnlen(str, len);
+	while (len && isspace(str[len-1]))
+		len--;
+
+	/* strip leading whitespace */
+	i = 0;
+	while (isspace(str[i]) && (i < len))
+		i++;
+
+	j = 0;
+	while (i < len) {
+		/* substitute multiple whitespace with a single '_' */
+		if (isspace(str[i])) {
+			while (isspace(str[i]))
+				i++;
+			to[j++] = '_';
+		}
+		to[j++] = str[i++];
+	}
+	to[j] = '\0';
+	return 0;
+}
+
+static int is_whitelisted(char c, const char *white)
+{
+	if ((c >= '0' && c <= '9') ||
+	    (c >= 'A' && c <= 'Z') ||
+	    (c >= 'a' && c <= 'z') ||
+	    strchr("#+-.:=@_", c) != NULL ||
+	    (white != NULL && strchr(white, c) != NULL))
+		return 1;
+	return 0;
+}
+
+/* allow chars in whitelist, plain ascii, hex-escaping and valid utf8 */
+int udev_util_replace_chars(char *str, const char *white)
+{
+	size_t i = 0;
+	int replaced = 0;
+
+	while (str[i] != '\0') {
+		int len;
+
+		if (is_whitelisted(str[i], white)) {
+			i++;
+			continue;
+		}
+
+		/* accept hex encoding */
+		if (str[i] == '\\' && str[i+1] == 'x') {
+			i += 2;
+			continue;
+		}
+
+		/* accept valid utf8 */
+		len = utf8_encoded_valid_unichar(&str[i]);
+		if (len > 1) {
+			i += len;
+			continue;
+		}
+
+		/* if space is allowed, replace whitespace with ordinary space */
+		if (isspace(str[i]) && white != NULL && strchr(white, ' ') != NULL) {
+			str[i] = ' ';
+			i++;
+			replaced++;
+			continue;
+		}
+
+		/* everything else is replaced with '_' */
+		str[i] = '_';
+		i++;
+		replaced++;
+	}
+	return replaced;
+}
+
+/**
+ * util_encode_string:
+ * @str: input string to be encoded
+ * @str_enc: output string to store the encoded input string
+ * @len: maximum size of the output string, which may be
+ *       four times as long as the input string
+ *
+ * Encode all potentially unsafe characters of a string to the
+ * corresponding hex value prefixed by '\x'.
+ *
+ * Returns: 0 if the entire string was copied, non-zero otherwise.
+ **/
+int udev_util_encode_string(const char *str, char *str_enc, size_t len)
+{
+	size_t i, j;
+
+	if (str == NULL || str_enc == NULL || len == 0)
+		return -1;
+
+	str_enc[0] = '\0';
+	for (i = 0, j = 0; str[i] != '\0'; i++) {
+		int seqlen;
+
+		seqlen = utf8_encoded_valid_unichar(&str[i]);
+		if (seqlen > 1) {
+			memcpy(&str_enc[j], &str[i], seqlen);
+			j += seqlen;
+			i += (seqlen-1);
+		} else if (str[i] == '\\' || !is_whitelisted(str[i], NULL)) {
+			sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
+			j += 4;
+		} else {
+			str_enc[j] = str[i];
+			j++;
+		}
+		if (j+3 >= len)
+			goto err;
+	}
+	str_enc[j] = '\0';
+	return 0;
+err:
+	return -1;
+}
+
+void util_set_fd_cloexec(int fd)
+{
+	int flags;
+
+	flags = fcntl(fd, F_GETFD);
+	if (flags < 0)
+		flags = FD_CLOEXEC;
+	else
+		flags |= FD_CLOEXEC;
+	fcntl(fd, F_SETFD, flags);
+}
+
+unsigned int util_string_hash32(const char *str)
+{
+	unsigned int hash = 0;
+
+	while (str[0] != '\0') {
+		hash += str[0] << 4;
+		hash += str[0] >> 4;
+		hash *= 11;
+		str++;
+	}
+	return hash;
+}