--- /dev/null
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+/* This file is based on the GLIB utf8 validation functions. The
+ * original license text follows. */
+
+/* gutf8.c - Operations on UTF-8 strings.
+ *
+ * Copyright (C) 1999 Tom Tromey
+ * Copyright (C) 2000 Red Hat, Inc.
+ *
+ * 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 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "utf8.h"
+
+#define FILTER_CHAR '_'
+
+static inline bool is_unicode_valid(uint32_t ch) {
+
+ if (ch >= 0x110000) /* End of unicode space */
+ return false;
+ if ((ch & 0xFFFFF800) == 0xD800) /* Reserved area for UTF-16 */
+ return false;
+ if ((ch >= 0xFDD0) && (ch <= 0xFDEF)) /* Reserved */
+ return false;
+ if ((ch & 0xFFFE) == 0xFFFE) /* BOM (Byte Order Mark) */
+ return false;
+
+ return true;
+}
+
+static inline bool is_continuation_char(uint8_t ch) {
+ if ((ch & 0xc0) != 0x80) /* 10xxxxxx */
+ return false;
+ return true;
+}
+
+static inline void merge_continuation_char(uint32_t *u_ch, uint8_t ch) {
+ *u_ch <<= 6;
+ *u_ch |= ch & 0x3f;
+}
+
+static char* utf8_validate(const char *str, char *output) {
+ uint32_t val = 0;
+ uint32_t min = 0;
+ const uint8_t *p, *last;
+ int size;
+ uint8_t *o;
+
+ assert(str);
+
+ o = (uint8_t*) output;
+ for (p = (const uint8_t*) str; *p; p++) {
+ if (*p < 128) {
+ if (o)
+ *o = *p;
+ } else {
+ last = p;
+
+ if ((*p & 0xe0) == 0xc0) { /* 110xxxxx two-char seq. */
+ size = 2;
+ min = 128;
+ val = (uint32_t) (*p & 0x1e);
+ goto ONE_REMAINING;
+ } else if ((*p & 0xf0) == 0xe0) { /* 1110xxxx three-char seq.*/
+ size = 3;
+ min = (1 << 11);
+ val = (uint32_t) (*p & 0x0f);
+ goto TWO_REMAINING;
+ } else if ((*p & 0xf8) == 0xf0) { /* 11110xxx four-char seq */
+ size = 4;
+ min = (1 << 16);
+ val = (uint32_t) (*p & 0x07);
+ } else
+ goto error;
+
+ p++;
+ if (!is_continuation_char(*p))
+ goto error;
+ merge_continuation_char(&val, *p);
+
+ TWO_REMAINING:
+ p++;
+ if (!is_continuation_char(*p))
+ goto error;
+ merge_continuation_char(&val, *p);
+
+ ONE_REMAINING:
+ p++;
+ if (!is_continuation_char(*p))
+ goto error;
+ merge_continuation_char(&val, *p);
+
+ if (val < min)
+ goto error;
+
+ if (!is_unicode_valid(val))
+ goto error;
+
+ if (o) {
+ memcpy(o, last, (size_t) size);
+ o += size;
+ }
+
+ continue;
+
+ error:
+ if (o) {
+ *o = FILTER_CHAR;
+ p = last; /* We retry at the next character */
+ } else
+ goto failure;
+ }
+
+ if (o)
+ o++;
+ }
+
+ if (o) {
+ *o = '\0';
+ return output;
+ }
+
+ return (char*) str;
+
+failure:
+ return NULL;
+}
+
+char* utf8_is_valid (const char *str) {
+ return utf8_validate(str, NULL);
+}
+
+char* utf8_filter (const char *str) {
+ char *new_str;
+
+ assert(str);
+
+ new_str = malloc(strlen(str) + 1);
+ if (!new_str)
+ return NULL;
+
+ return utf8_validate(str, new_str);
+}
+
+char *ascii_is_valid(const char *str) {
+ const char *p;
+
+ assert(str);
+
+ for (p = str; *p; p++)
+ if ((unsigned char) *p >= 128)
+ return NULL;
+
+ return (char*) str;
+}
+
+char *ascii_filter(const char *str) {
+ char *r, *s, *d;
+ size_t l;
+
+ assert(str);
+
+ l = strlen(str);
+ r = malloc(l + 1);
+ if (!r)
+ return NULL;
+
+ for (s = r, d = r; *s; s++)
+ if ((unsigned char) *s < 128)
+ *(d++) = *s;
+
+ *d = 0;
+
+ return r;
+}
~ianmdlvl / elogind.git / blobdiff