source: vendor/3.5.5/lib/util/util_str.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 7.1 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Samba utility functions
4
5 Copyright (C) Andrew Tridgell 1992-2001
6 Copyright (C) Simo Sorce 2001-2002
7 Copyright (C) Martin Pool 2003
8 Copyright (C) James Peach 2005
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
22*/
23
24#include "includes.h"
25#include "system/locale.h"
26#undef strncasecmp
27#undef strcasemp
28
29/**
30 * @file
31 * @brief String utilities.
32 **/
33
34/**
35 Safe string copy into a known length string. maxlength does not
36 include the terminating zero.
37**/
38_PUBLIC_ char *safe_strcpy(char *dest,const char *src, size_t maxlength)
39{
40 size_t len;
41
42 if (!dest) {
43 DEBUG(0,("ERROR: NULL dest in safe_strcpy\n"));
44 return NULL;
45 }
46
47#ifdef DEVELOPER
48 /* We intentionally write out at the extremity of the destination
49 * string. If the destination is too short (e.g. pstrcpy into mallocd
50 * or fstring) then this should cause an error under a memory
51 * checker. */
52 dest[maxlength] = '\0';
53 if (PTR_DIFF(&len, dest) > 0) { /* check if destination is on the stack, ok if so */
54 log_suspicious_usage("safe_strcpy", src);
55 }
56#endif
57
58 if (!src) {
59 *dest = 0;
60 return dest;
61 }
62
63 len = strlen(src);
64
65 if (len > maxlength) {
66 DEBUG(0,("ERROR: string overflow by %u (%u - %u) in safe_strcpy [%.50s]\n",
67 (uint_t)(len-maxlength), (unsigned)len, (unsigned)maxlength, src));
68 len = maxlength;
69 }
70
71 memmove(dest, src, len);
72 dest[len] = 0;
73 return dest;
74}
75
76/**
77 Safe string cat into a string. maxlength does not
78 include the terminating zero.
79**/
80_PUBLIC_ char *safe_strcat(char *dest, const char *src, size_t maxlength)
81{
82 size_t src_len, dest_len;
83
84 if (!dest) {
85 DEBUG(0,("ERROR: NULL dest in safe_strcat\n"));
86 return NULL;
87 }
88
89 if (!src)
90 return dest;
91
92#ifdef DEVELOPER
93 if (PTR_DIFF(&src_len, dest) > 0) { /* check if destination is on the stack, ok if so */
94 log_suspicious_usage("safe_strcat", src);
95 }
96#endif
97 src_len = strlen(src);
98 dest_len = strlen(dest);
99
100 if (src_len + dest_len > maxlength) {
101 DEBUG(0,("ERROR: string overflow by %d in safe_strcat [%.50s]\n",
102 (int)(src_len + dest_len - maxlength), src));
103 if (maxlength > dest_len) {
104 memcpy(&dest[dest_len], src, maxlength - dest_len);
105 }
106 dest[maxlength] = 0;
107 return NULL;
108 }
109
110 memcpy(&dest[dest_len], src, src_len);
111 dest[dest_len + src_len] = 0;
112 return dest;
113}
114
115#ifdef VALGRIND
116size_t valgrind_strlen(const char *s)
117{
118 size_t count;
119 for(count = 0; *s++; count++)
120 ;
121 return count;
122}
123#endif
124
125
126/**
127 format a string into length-prefixed dotted domain format, as used in NBT
128 and in some ADS structures
129**/
130_PUBLIC_ const char *str_format_nbt_domain(TALLOC_CTX *mem_ctx, const char *s)
131{
132 char *ret;
133 int i;
134 if (!s || !*s) {
135 return talloc_strdup(mem_ctx, "");
136 }
137 ret = talloc_array(mem_ctx, char, strlen(s)+2);
138 if (!ret) {
139 return ret;
140 }
141
142 memcpy(ret+1, s, strlen(s)+1);
143 ret[0] = '.';
144
145 for (i=0;ret[i];i++) {
146 if (ret[i] == '.') {
147 char *p = strchr(ret+i+1, '.');
148 if (p) {
149 ret[i] = p-(ret+i+1);
150 } else {
151 ret[i] = strlen(ret+i+1);
152 }
153 }
154 }
155
156 talloc_set_name_const(ret, ret);
157
158 return ret;
159}
160
161/**
162 * Add a string to an array of strings.
163 *
164 * num should be a pointer to an integer that holds the current
165 * number of elements in strings. It will be updated by this function.
166 */
167_PUBLIC_ bool add_string_to_array(TALLOC_CTX *mem_ctx,
168 const char *str, const char ***strings, int *num)
169{
170 char *dup_str = talloc_strdup(mem_ctx, str);
171
172 *strings = talloc_realloc(mem_ctx,
173 *strings,
174 const char *, ((*num)+1));
175
176 if ((*strings == NULL) || (dup_str == NULL))
177 return false;
178
179 (*strings)[*num] = dup_str;
180 *num += 1;
181
182 return true;
183}
184
185/**
186 * Parse a string containing a boolean value.
187 *
188 * val will be set to the read value.
189 *
190 * @retval true if a boolean value was parsed, false otherwise.
191 */
192_PUBLIC_ bool conv_str_bool(const char * str, bool * val)
193{
194 char * end = NULL;
195 long lval;
196
197 if (str == NULL || *str == '\0') {
198 return false;
199 }
200
201 lval = strtol(str, &end, 10 /* base */);
202 if (end == NULL || *end != '\0' || end == str) {
203 return set_boolean(str, val);
204 }
205
206 *val = (lval) ? true : false;
207 return true;
208}
209
210/**
211 * Convert a size specification like 16K into an integral number of bytes.
212 **/
213_PUBLIC_ bool conv_str_size(const char * str, uint64_t * val)
214{
215 char * end = NULL;
216 unsigned long long lval;
217
218 if (str == NULL || *str == '\0') {
219 return false;
220 }
221
222 lval = strtoull(str, &end, 10 /* base */);
223 if (end == NULL || end == str) {
224 return false;
225 }
226
227 if (*end) {
228 if (strwicmp(end, "K") == 0) {
229 lval *= 1024ULL;
230 } else if (strwicmp(end, "M") == 0) {
231 lval *= (1024ULL * 1024ULL);
232 } else if (strwicmp(end, "G") == 0) {
233 lval *= (1024ULL * 1024ULL * 1024ULL);
234 } else if (strwicmp(end, "T") == 0) {
235 lval *= (1024ULL * 1024ULL * 1024ULL * 1024ULL);
236 } else if (strwicmp(end, "P") == 0) {
237 lval *= (1024ULL * 1024ULL * 1024ULL * 1024ULL * 1024ULL);
238 } else {
239 return false;
240 }
241 }
242
243 *val = (uint64_t)lval;
244 return true;
245}
246
247/**
248 * Parse a uint64_t value from a string
249 *
250 * val will be set to the value read.
251 *
252 * @retval true if parsing was successful, false otherwise
253 */
254_PUBLIC_ bool conv_str_u64(const char * str, uint64_t * val)
255{
256 char * end = NULL;
257 unsigned long long lval;
258
259 if (str == NULL || *str == '\0') {
260 return false;
261 }
262
263 lval = strtoull(str, &end, 10 /* base */);
264 if (end == NULL || *end != '\0' || end == str) {
265 return false;
266 }
267
268 *val = (uint64_t)lval;
269 return true;
270}
271
272/**
273Do a case-insensitive, whitespace-ignoring string compare.
274**/
275_PUBLIC_ int strwicmp(const char *psz1, const char *psz2)
276{
277 /* if BOTH strings are NULL, return TRUE, if ONE is NULL return */
278 /* appropriate value. */
279 if (psz1 == psz2)
280 return (0);
281 else if (psz1 == NULL)
282 return (-1);
283 else if (psz2 == NULL)
284 return (1);
285
286 /* sync the strings on first non-whitespace */
287 while (1) {
288 while (isspace((int)*psz1))
289 psz1++;
290 while (isspace((int)*psz2))
291 psz2++;
292 if (toupper((unsigned char)*psz1) != toupper((unsigned char)*psz2)
293 || *psz1 == '\0'
294 || *psz2 == '\0')
295 break;
296 psz1++;
297 psz2++;
298 }
299 return (*psz1 - *psz2);
300}
301
302/**
303 * Compare 2 strings.
304 *
305 * @note The comparison is case-insensitive.
306 **/
307_PUBLIC_ bool strequal(const char *s1, const char *s2)
308{
309 if (s1 == s2)
310 return true;
311 if (!s1 || !s2)
312 return false;
313
314 return strcasecmp(s1,s2) == 0;
315}
316
317_PUBLIC_ size_t ucs2_align(const void *base_ptr, const void *p, int flags)
318{
319 if (flags & (STR_NOALIGN|STR_ASCII))
320 return 0;
321 return PTR_DIFF(p, base_ptr) & 1;
322}
323
324/**
325 String replace.
326**/
327_PUBLIC_ void string_replace(char *s, char oldc, char newc)
328{
329 while (*s) {
330 if (*s == oldc) *s = newc;
331 s++;
332 }
333}
334
335
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