1/*
2 * Copyright (C) 2004-2007  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: string.c,v 1.20 2007/06/19 23:47:17 tbox Exp $ */
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	va_list args;
170	size_t n;
171
172	REQUIRE(size > 0U);
173
174	va_start(args, format);
175	n = vsnprintf(target, size, format, args);
176	va_end(args);
177
178	ENSURE(strlen(target) < size);
179}
180
181char *
182isc_string_regiondup(isc_mem_t *mctx, const isc_region_t *source) {
183	char *target;
184
185	REQUIRE(mctx != NULL);
186	REQUIRE(source != NULL);
187
188	target = (char *) isc_mem_allocate(mctx, source->length + 1);
189	if (target != NULL) {
190		memcpy(source->base, target, source->length);
191		target[source->length] = '\0';
192	}
193
194	return (target);
195}
196
197char *
198isc_string_separate(char **stringp, const char *delim) {
199	char *string = *stringp;
200	char *s;
201	const char *d;
202	char sc, dc;
203
204	if (string == NULL)
205		return (NULL);
206
207	for (s = string; (sc = *s) != '\0'; s++)
208		for (d = delim; (dc = *d) != '\0'; d++)
209			if (sc == dc) {
210				*s++ = '\0';
211				*stringp = s;
212				return (string);
213			}
214	*stringp = NULL;
215	return (string);
216}
217
218size_t
219isc_string_strlcpy(char *dst, const char *src, size_t size)
220{
221	char *d = dst;
222	const char *s = src;
223	size_t n = size;
224
225	/* Copy as many bytes as will fit */
226	if (n != 0U && --n != 0U) {
227		do {
228			if ((*d++ = *s++) == 0)
229				break;
230		} while (--n != 0U);
231	}
232
233	/* Not enough room in dst, add NUL and traverse rest of src */
234	if (n == 0U) {
235		if (size != 0U)
236			*d = '\0';		/* NUL-terminate dst */
237		while (*s++)
238			;
239	}
240
241	return(s - src - 1);	/* count does not include NUL */
242}
243
244size_t
245isc_string_strlcat(char *dst, const char *src, size_t size)
246{
247	char *d = dst;
248	const char *s = src;
249	size_t n = size;
250	size_t dlen;
251
252	/* Find the end of dst and adjust bytes left but don't go past end */
253	while (n-- != 0U && *d != '\0')
254		d++;
255	dlen = d - dst;
256	n = size - dlen;
257
258	if (n == 0U)
259		return(dlen + strlen(s));
260	while (*s != '\0') {
261		if (n != 1U) {
262			*d++ = *s;
263			n--;
264		}
265		s++;
266	}
267	*d = '\0';
268
269	return(dlen + (s - src));	/* count does not include NUL */
270}
271