1 files changed, 313 insertions, 0 deletions
diff --git a/lib/isc/string.c b/lib/isc/string.c
new file mode 100644
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--- /dev/null
+++ b/lib/isc/string.c
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*! \file */
+
+#include <config.h>
+
+#include <ctype.h>
+
+#include <isc/mem.h>
+#include <isc/print.h>
+#include <isc/region.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+static const char digits[] = "0123456789abcdefghijklmnoprstuvwxyz";
+
+uint64_t
+isc_string_touint64(char *source, char **end, int base) {
+	uint64_t tmp;
+	uint64_t overflow;
+	char *s = source;
+	const char *o;
+	char c;
+
+	if ((base < 0) || (base == 1) || (base > 36)) {
+		*end = source;
+		return (0);
+	}
+
+	while (*s != 0 && isascii(*s&0xff) && isspace(*s&0xff))
+		s++;
+	if (*s == '+' /* || *s == '-' */)
+		s++;
+	if (base == 0) {
+		if (*s == '0' && (*(s+1) == 'X' || *(s+1) == 'x')) {
+			s += 2;
+			base = 16;
+		} else if (*s == '0')
+			base = 8;
+		else
+			base = 10;
+	}
+	if (*s == 0) {
+		*end = source;
+		return (0);
+	}
+	overflow = ~0;
+	overflow /= base;
+	tmp = 0;
+
+	while ((c = *s) != 0) {
+		c = tolower(c&0xff);
+		/* end ? */
+		if ((o = strchr(digits, c)) == NULL) {
+			*end = s;
+			return (tmp);
+		}
+		/* end ? */
+		if ((o - digits) >= base) {
+			*end = s;
+			return (tmp);
+		}
+		/* overflow ? */
+		if (tmp > overflow) {
+			*end = source;
+			return (0);
+		}
+		tmp *= base;
+		/* overflow ? */
+		if ((tmp + (o - digits)) < tmp) {
+			*end = source;
+			return (0);
+		}
+		tmp += o - digits;
+		s++;
+	}
+	*end = s;
+	return (tmp);
+}
+
+isc_result_t
+isc_string_copy(char *target, size_t size, const char *source) {
+	REQUIRE(size > 0U);
+
+	if (strlcpy(target, source, size) >= size) {
+		memset(target, ISC_STRING_MAGIC, size);
+		return (ISC_R_NOSPACE);
+	}
+
+	ENSURE(strlen(target) < size);
+
+	return (ISC_R_SUCCESS);
+}
+
+void
+isc_string_copy_truncate(char *target, size_t size, const char *source) {
+	REQUIRE(size > 0U);
+
+	strlcpy(target, source, size);
+
+	ENSURE(strlen(target) < size);
+}
+
+isc_result_t
+isc_string_append(char *target, size_t size, const char *source) {
+	REQUIRE(size > 0U);
+	REQUIRE(strlen(target) < size);
+
+	if (strlcat(target, source, size) >= size) {
+		memset(target, ISC_STRING_MAGIC, size);
+		return (ISC_R_NOSPACE);
+	}
+
+	ENSURE(strlen(target) < size);
+
+	return (ISC_R_SUCCESS);
+}
+
+void
+isc_string_append_truncate(char *target, size_t size, const char *source) {
+	REQUIRE(size > 0U);
+	REQUIRE(strlen(target) < size);
+
+	strlcat(target, source, size);
+
+	ENSURE(strlen(target) < size);
+}
+
+isc_result_t
+isc_string_printf(char *target, size_t size, const char *format, ...) {
+	va_list args;
+	size_t n;
+
+	REQUIRE(size > 0U);
+
+	va_start(args, format);
+	n = vsnprintf(target, size, format, args);
+	va_end(args);
+
+	if (n >= size) {
+		memset(target, ISC_STRING_MAGIC, size);
+		return (ISC_R_NOSPACE);
+	}
+
+	ENSURE(strlen(target) < size);
+
+	return (ISC_R_SUCCESS);
+}
+
+void
+isc_string_printf_truncate(char *target, size_t size, const char *format, ...)
+{
+	va_list args;
+
+	REQUIRE(size > 0U);
+
+	va_start(args, format);
+	/* check return code? */
+	(void)vsnprintf(target, size, format, args);
+	va_end(args);
+
+	ENSURE(strlen(target) < size);
+}
+
+char *
+isc_string_regiondup(isc_mem_t *mctx, const isc_region_t *source) {
+	char *target;
+
+	REQUIRE(mctx != NULL);
+	REQUIRE(source != NULL);
+
+	target = (char *) isc_mem_allocate(mctx, source->length + 1);
+	if (target != NULL) {
+		memmove(source->base, target, source->length);
+		target[source->length] = '\0';
+	}
+
+	return (target);
+}
+
+char *
+isc_string_separate(char **stringp, const char *delim) {
+	char *string = *stringp;
+	char *s;
+	const char *d;
+	char sc, dc;
+
+	if (string == NULL)
+		return (NULL);
+
+	for (s = string; (sc = *s) != '\0'; s++)
+		for (d = delim; (dc = *d) != '\0'; d++)
+			if (sc == dc) {
+				*s++ = '\0';
+				*stringp = s;
+				return (string);
+			}
+	*stringp = NULL;
+	return (string);
+}
+
+size_t
+isc_string_strlcpy(char *dst, const char *src, size_t size)
+{
+	char *d = dst;
+	const char *s = src;
+	size_t n = size;
+
+	/* Copy as many bytes as will fit */
+	if (n != 0U && --n != 0U) {
+		do {
+			if ((*d++ = *s++) == 0)
+				break;
+		} while (--n != 0U);
+	}
+
+	/* Not enough room in dst, add NUL and traverse rest of src */
+	if (n == 0U) {
+		if (size != 0U)
+			*d = '\0';		/* NUL-terminate dst */
+		while (*s++)
+			;
+	}
+
+	return(s - src - 1);	/* count does not include NUL */
+}
+
+size_t
+isc_string_strlcat(char *dst, const char *src, size_t size)
+{
+	char *d = dst;
+	const char *s = src;
+	size_t n = size;
+	size_t dlen;
+
+	/* Find the end of dst and adjust bytes left but don't go past end */
+	while (n-- != 0U && *d != '\0')
+		d++;
+	dlen = d - dst;
+	n = size - dlen;
+
+	if (n == 0U)
+		return(dlen + strlen(s));
+	while (*s != '\0') {
+		if (n != 1U) {
+			*d++ = *s;
+			n--;
+		}
+		s++;
+	}
+	*d = '\0';
+
+	return(dlen + (s - src));	/* count does not include NUL */
+}
+
+char *
+isc_string_strcasestr(const char *str, const char *search) {
+	char c, sc, *s;
+	size_t len;
+
+	if ((c = *search++) != 0) {
+		c = tolower((unsigned char) c);
+		len = strlen(search);
+		do {
+			do {
+				if ((sc = *str++) == 0)
+					return (NULL);
+			} while ((char) tolower((unsigned char) sc) != c);
+		} while (strncasecmp(str, search, len) != 0);
+		str--;
+	}
+	DE_CONST(str, s);
+	return (s);
+
+}