/contrib/bind9/lib/isc/string.c

  1/*
  2 * Copyright (C) 2004-2007, 2011, 2012  Internet Systems Consortium, Inc. ("ISC")
  3 * Copyright (C) 1999-2001, 2003  Internet Software Consortium.
  4 *
  5 * Permission to use, copy, modify, and/or distribute this software for any
  6 * purpose with or without fee is hereby granted, provided that the above
  7 * copyright notice and this permission notice appear in all copies.
  8 *
  9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 11 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 15 * PERFORMANCE OF THIS SOFTWARE.
 16 */
 17
 18/* $Id$ */
 19
 20/*! \file */
 21
 22#include <config.h>
 23
 24#include <ctype.h>
 25
 26#include <isc/mem.h>
 27#include <isc/print.h>
 28#include <isc/region.h>
 29#include <isc/string.h>
 30#include <isc/util.h>
 31
 32static char digits[] = "0123456789abcdefghijklmnoprstuvwxyz";
 33
 34isc_uint64_t
 35isc_string_touint64(char *source, char **end, int base) {
 36	isc_uint64_t tmp;
 37	isc_uint64_t overflow;
 38	char *s = source;
 39	char *o;
 40	char c;
 41
 42	if ((base < 0) || (base == 1) || (base > 36)) {
 43		*end = source;
 44		return (0);
 45	}
 46
 47	while (*s != 0 && isascii(*s&0xff) && isspace(*s&0xff))
 48		s++;
 49	if (*s == '+' /* || *s == '-' */)
 50		s++;
 51	if (base == 0) {
 52		if (*s == '0' && (*(s+1) == 'X' || *(s+1) == 'x')) {
 53			s += 2;
 54			base = 16;
 55		} else if (*s == '0')
 56			base = 8;
 57		else
 58			base = 10;
 59	}
 60	if (*s == 0) {
 61		*end = source;
 62		return (0);
 63	}
 64	overflow = ~0;
 65	overflow /= base;
 66	tmp = 0;
 67
 68	while ((c = *s) != 0) {
 69		c = tolower(c&0xff);
 70		/* end ? */
 71		if ((o = strchr(digits, c)) == NULL) {
 72			*end = s;
 73			return (tmp);
 74		}
 75		/* end ? */
 76		if ((o - digits) >= base) {
 77			*end = s;
 78			return (tmp);
 79		}
 80		/* overflow ? */
 81		if (tmp > overflow) {
 82			*end = source;
 83			return (0);
 84		}
 85		tmp *= base;
 86		/* overflow ? */
 87		if ((tmp + (o - digits)) < tmp) {
 88			*end = source;
 89			return (0);
 90		}
 91		tmp += o - digits;
 92		s++;
 93	}
 94	*end = s;
 95	return (tmp);
 96}
 97
 98isc_result_t
 99isc_string_copy(char *target, size_t size, const char *source) {
100	REQUIRE(size > 0U);
101
102	if (strlcpy(target, source, size) >= size) {
103		memset(target, ISC_STRING_MAGIC, size);
104		return (ISC_R_NOSPACE);
105	}
106
107	ENSURE(strlen(target) < size);
108
109	return (ISC_R_SUCCESS);
110}
111
112void
113isc_string_copy_truncate(char *target, size_t size, const char *source) {
114	REQUIRE(size > 0U);
115
116	strlcpy(target, source, size);
117
118	ENSURE(strlen(target) < size);
119}
120
121isc_result_t
122isc_string_append(char *target, size_t size, const char *source) {
123	REQUIRE(size > 0U);
124	REQUIRE(strlen(target) < size);
125
126	if (strlcat(target, source, size) >= size) {
127		memset(target, ISC_STRING_MAGIC, size);
128		return (ISC_R_NOSPACE);
129	}
130
131	ENSURE(strlen(target) < size);
132
133	return (ISC_R_SUCCESS);
134}
135
136void
137isc_string_append_truncate(char *target, size_t size, const char *source) {
138	REQUIRE(size > 0U);
139	REQUIRE(strlen(target) < size);
140
141	strlcat(target, source, size);
142
143	ENSURE(strlen(target) < size);
144}
145
146isc_result_t
147isc_string_printf(char *target, size_t size, const char *format, ...) {
148	va_list args;
149	size_t n;
150
151	REQUIRE(size > 0U);
152
153	va_start(args, format);
154	n = vsnprintf(target, size, format, args);
155	va_end(args);
156
157	if (n >= size) {
158		memset(target, ISC_STRING_MAGIC, size);
159		return (ISC_R_NOSPACE);
160	}
161
162	ENSURE(strlen(target) < size);
163
164	return (ISC_R_SUCCESS);
165}
166
167void
168isc_string_printf_truncate(char *target, size_t size, const char *format, ...)
169{
170	va_list args;
171
172	REQUIRE(size > 0U);
173
174	va_start(args, format);
175	/* check return code? */
176	(void)vsnprintf(target, size, format, args);
177	va_end(args);
178
179	ENSURE(strlen(target) < size);
180}
181
182char *
183isc_string_regiondup(isc_mem_t *mctx, const isc_region_t *source) {
184	char *target;
185
186	REQUIRE(mctx != NULL);
187	REQUIRE(source != NULL);
188
189	target = (char *) isc_mem_allocate(mctx, source->length + 1);
190	if (target != NULL) {
191		memcpy(source->base, target, source->length);
192		target[source->length] = '\0';
193	}
194
195	return (target);
196}
197
198char *
199isc_string_separate(char **stringp, const char *delim) {
200	char *string = *stringp;
201	char *s;
202	const char *d;
203	char sc, dc;
204
205	if (string == NULL)
206		return (NULL);
207
208	for (s = string; (sc = *s) != '\0'; s++)
209		for (d = delim; (dc = *d) != '\0'; d++)
210			if (sc == dc) {
211				*s++ = '\0';
212				*stringp = s;
213				return (string);
214			}
215	*stringp = NULL;
216	return (string);
217}
218
219size_t
220isc_string_strlcpy(char *dst, const char *src, size_t size)
221{
222	char *d = dst;
223	const char *s = src;
224	size_t n = size;
225
226	/* Copy as many bytes as will fit */
227	if (n != 0U && --n != 0U) {
228		do {
229			if ((*d++ = *s++) == 0)
230				break;
231		} while (--n != 0U);
232	}
233
234	/* Not enough room in dst, add NUL and traverse rest of src */
235	if (n == 0U) {
236		if (size != 0U)
237			*d = '\0';		/* NUL-terminate dst */
238		while (*s++)
239			;
240	}
241
242	return(s - src - 1);	/* count does not include NUL */
243}
244
245size_t
246isc_string_strlcat(char *dst, const char *src, size_t size)
247{
248	char *d = dst;
249	const char *s = src;
250	size_t n = size;
251	size_t dlen;
252
253	/* Find the end of dst and adjust bytes left but don't go past end */
254	while (n-- != 0U && *d != '\0')
255		d++;
256	dlen = d - dst;
257	n = size - dlen;
258
259	if (n == 0U)
260		return(dlen + strlen(s));
261	while (*s != '\0') {
262		if (n != 1U) {
263			*d++ = *s;
264			n--;
265		}
266		s++;
267	}
268	*d = '\0';
269
270	return(dlen + (s - src));	/* count does not include NUL */
271}