Annotation of libelwix/src/regex.c, revision 1.2.20.1
1.1 misho 1: /*************************************************************************
2: * (C) 2013 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
3: * by Michael Pounov <misho@elwix.org>
4: *
5: * $Author: misho $
1.2.20.1! misho 6: * $Id: regex.c,v 1.2 2014/01/29 14:16:54 misho Exp $
1.1 misho 7: *
8: **************************************************************************
9: The ELWIX and AITNET software is distributed under the following
10: terms:
11:
12: All of the documentation and software included in the ELWIX and AITNET
13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
14:
1.2.20.1! misho 15: Copyright 2004 - 2015
1.1 misho 16: by Michael Pounov <misho@elwix.org>. All rights reserved.
17:
18: Redistribution and use in source and binary forms, with or without
19: modification, are permitted provided that the following conditions
20: are met:
21: 1. Redistributions of source code must retain the above copyright
22: notice, this list of conditions and the following disclaimer.
23: 2. Redistributions in binary form must reproduce the above copyright
24: notice, this list of conditions and the following disclaimer in the
25: documentation and/or other materials provided with the distribution.
26: 3. All advertising materials mentioning features or use of this software
27: must display the following acknowledgement:
28: This product includes software developed by Michael Pounov <misho@elwix.org>
29: ELWIX - Embedded LightWeight unIX and its contributors.
30: 4. Neither the name of AITNET nor the names of its contributors
31: may be used to endorse or promote products derived from this software
32: without specific prior written permission.
33:
34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37: ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: SUCH DAMAGE.
45: */
46: #include "global.h"
47:
48:
49: /*
50: * regex_Verify() - Function for verify data match in regex expression
51: *
52: * @csRegex = Regulare expression pattern
53: * @csData = Data for check and verify
54: * @startPos = Return start positions
55: * @endPos = Return end positions
56: * return: NULL not match or error; !=NULL begin of matched data
57: */
58: const char *
59: regex_Verify(const char *csRegex, const char *csData, int *startPos, int *endPos)
60: {
61: regex_t re;
62: regmatch_t match;
63: char szErr[STRSIZ];
64: int ret, flg;
65: const char *pos;
66:
67: if (!csRegex || !csData)
68: return NULL;
69:
70: if ((ret = regcomp(&re, csRegex, REG_EXTENDED))) {
71: regerror(ret, &re, szErr, STRSIZ);
72: elwix_SetErr(ret, "%s", szErr);
73: regfree(&re);
74: return NULL;
75: }
76:
77: for (ret = flg = 0, pos = csData; !(ret = regexec(&re, pos, 1, &match, flg));
78: pos += match.rm_eo, flg = REG_NOTBOL) {
79: if (startPos)
80: *startPos = match.rm_so;
81: if (endPos)
82: *endPos = match.rm_eo;
83:
84: pos += match.rm_so;
85: break;
86: }
87:
88: if (ret) {
89: regerror(ret, &re, szErr, STRSIZ);
90: elwix_SetErr(ret, "%s", szErr);
91: pos = NULL;
92: }
93:
94: regfree(&re);
95: return pos;
96: }
97:
98: /*
99: * regex_Get() - Function for get data match in regex expression
100: *
101: * @csRegex = Regulare expression pattern
102: * @csData = Data from get
103: * @psString = Returned string if match
104: * @strLen = Length of string
105: * return: 0 not match; >0 count of returned chars
106: */
107: int
108: regex_Get(const char *csRegex, const char *csData, char * __restrict psString, int strLen)
109: {
110: int sp, ep, len;
111: const char *str;
112:
113: if (!csRegex || !csData)
114: return -1;
115:
116: str = regex_Verify(csRegex, csData, &sp, &ep);
117: if (!str)
118: return 0;
119:
120: len = ep - sp;
121: if (psString && strLen) {
122: memset(psString, 0, strLen);
123: strncpy(psString, str, strLen <= len ? strLen - 1 : len);
124: }
125:
126: return len;
127: }
128:
129: /*
130: * regex_Replace() - Function for replace data match in regex expression with newdata
131: *
132: * @csRegex = Regulare expression pattern
133: * @csData = Source data
134: * @csNew = Data for replace
135: * return: NULL not match or error; !=NULL allocated new string, must be e_free after use!
136: */
137: char *
138: regex_Replace(const char *csRegex, const char *csData, const char *csNew)
139: {
140: int sp, ep, len;
141: char *tmp, *str = NULL;
142:
143: if (!csRegex || !csData)
144: return NULL;
145:
146: if (!regex_Verify(csRegex, csData, &sp, &ep))
147: return NULL;
148:
149: // ___ before match
150: len = sp + 1;
151: str = e_malloc(len);
152: if (!str)
153: return NULL;
154: else
155: strlcpy(str, csData, len);
156: // * replace match *
157: if (csNew) {
158: len += strlen(csNew);
159: tmp = e_realloc(str, len);
160: if (!tmp) {
161: e_free(str);
162: return NULL;
163: } else {
164: str = tmp;
165: strlcat(str, csNew, len);
166: }
167: }
168: // after match ___
169: len += strlen(csData) - ep;
170: tmp = e_realloc(str, len);
171: if (!tmp) {
172: e_free(str);
173: return NULL;
174: } else {
175: str = tmp;
176: strlcat(str, csData + ep, len);
177: }
178:
179: return str;
180: }
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