aboutsummaryrefslogtreecommitdiff
path: root/pcre.c
blob: 222595256327f770a59ea013990f286bf33b0ba0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
/*
    make_pcre - PCRE plugin for GNU make.
    Copyright (C) 2014  Dmitry Mikhirev

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <string.h>

#include <gnumake.h>
#include <pcre.h>

int plugin_is_GPL_compatible;

const int MAX_CAP = 256;   /* maximum number of substrings to capture */
const int MAX_CAP_LEN = 3; /* number of decimal digits in MAX_CAP */

/* esc_str() - escape string before assigning it to make variable */
char *esc_str(const char *str)
{
	const char *ps; /* pointer to char in unescaped string */
	char *esc;      /* escaped string */
	char *pe;       /* pointer to char in escaped string */

	esc = malloc(strlen(str) * 2 + 1);
	if (esc == NULL) {
		return NULL;
	}

	for (ps = str, pe = esc; *ps != '\0'; ps++, pe++) {
		switch (*ps) {
		case '$': /* prepend with '$' */
			*pe = '$';
			pe++;
			break;
		}
		*pe = *ps;
	}
	*pe = '\0';

	return esc;
}

/* def_var() - define make variable */
int def_var(const char *name, const char *value)
{
	char *escv;  /* escaped value */
	char *mkdef; /* variable definition for make */

	escv = esc_str(value);
	if (escv == NULL) {
		return -1;
	};
	mkdef = malloc(strlen(name) + strlen(escv) + 16);
	if (mkdef == NULL) {
		return -1;
	}
	sprintf(mkdef, "define %s\n%s\nendef\n", name, escv);
	gmk_eval(mkdef, NULL);

	free(escv);
	free(mkdef);
	return 0;
}

/* def_nvar() define numbered make variable */
int def_nvar(int num, const char *value)
{
	char *escv;  /* escaped value */
	char *mkdef; /* variable definition for make */

	escv = esc_str(value);
	if (escv == NULL) {
		return -1;
	};
	mkdef = malloc(MAX_CAP_LEN + strlen(escv) + 16);
	if (mkdef == NULL) {
		return -1;
	}
	sprintf(mkdef, "define %d\n%s\nendef\n", num, escv);
	gmk_eval(mkdef, NULL);

	free(escv);
	free(mkdef);
	return 0;
}

/* set_comp_opt - set regexp option */
int parse_comp_opt(const char flag, const char *func)
{
	int b; /* PCRE configuration option value */

	switch (flag) {
	case 'i': /* ignore case */
		return PCRE_CASELESS;  break;
	case 'm': /* multi-line */
		return PCRE_MULTILINE; break;
	case 's': /* single-line */
		return PCRE_DOTALL;    break;
	case 'u': /* use Unicode properties */
		pcre_config(PCRE_CONFIG_UNICODE_PROPERTIES, &b);
		if (b) {
			return PCRE_UCP;
		} else {
			fprintf(stderr, "%s: PCRE library does not support "
					"Unicode properties, "
					"`%c' option is unavailable\n",
					func, flag);
		}
		break;
	case 'U': /* ungreedy quantifiers */
		return PCRE_UNGREEDY;  break;
	case 'x': /* extended regexp */
		return PCRE_EXTENDED;  break;
	case 'X': /* PCRE extras */
		return PCRE_EXTRA;     break;
	case '8': /* UTF-8 */
		pcre_config(PCRE_CONFIG_UTF8, &b);
		if (b) {
			return PCRE_UTF8;
		} else {
			fprintf(stderr, "%s: PCRE library does not support "
					"UTF-8, "
					"`%c' option is unavailable\n",
					func, flag);
		}
		break;
	default: /* unknown option */
		fprintf(stderr, "%s: unknown option `%c'\n", func, flag);
		break;
	}
	return 0;
}

/* set_vars() - set make variables to captured substrings */
int set_vars(const char *subj, int *ovec, const int ncap)
{
	int i;           /* loop iterator */
	const char *cap; /* captured substring */
	int caplen;      /* length of captured substring */

	for (i = 0; (i < ncap) && (i < MAX_CAP); i++) {
		caplen = pcre_get_substring(subj, ovec, ncap, i, &cap);
		if (caplen < 0) { /* unable to get substring */
			continue;
		}
		def_nvar(i, cap);
		pcre_free_substring(cap);
	}
	for (; i < MAX_CAP; i++) { /* udefine remaining make vars */
		char mk_set[MAX_CAP_LEN + 11];
		sprintf(mk_set, "undefine %d\n", i);
		gmk_eval(mk_set, NULL);
	}
	return ncap;
}

/* set_named_vars() - set make variables to substrings captured by name */
int set_named_vars(const pcre *re, const char *subj, int *ovec, const int ncap)
{
	int ncount;      /* name count */
	int nentrysize;  /* size of name entry */
	char *ntable;    /* name table */
	int i;           /* loop iterator */
	char *n;         /* name pointer */
	const char *cap; /* captured substring */
	int caplen;      /* length of captured substring */

	pcre_fullinfo(re, NULL, PCRE_INFO_NAMECOUNT, &ncount);
	if (ncount <= 0) { /* no names defined, nothing to do */
		return ncount;
	}
	pcre_fullinfo(re, NULL, PCRE_INFO_NAMEENTRYSIZE, &nentrysize);
	pcre_fullinfo(re, NULL, PCRE_INFO_NAMETABLE, &ntable);
	for (i = 0; i < ncount; i++) {
		n = ntable + (i * nentrysize) + 2;
		caplen = pcre_get_named_substring(re, subj, ovec,
				ncap, n, &cap);
		if (caplen < 0) { /* unable to get substring */
			continue;
		}
		def_var(n, cap);
		pcre_free_substring(cap);
	}
	return i;
}

/* match() - function to be attached to make pattern matching function */
char *match(const char *name, int argc, char **argv)
{
	char *pat = NULL;    /* expanded pattern */
	char *p;             /* iteration pointer */
	int co = 0;          /* pattern compilation options */
	pcre *re;            /* compiled regexp */
	const char *err;     /* compilation error */
	int erroffset;       /* offset in pattern where error occured */
	char *str = NULL;    /* expanded subject string */
	int ncap = 0;        /* number of captured substrings */
	int ovec[MAX_CAP*3]; /* ovector */
	char *retstr = NULL; /* string to be returned */

	if (argc > 2) { /* options provided, parse them */
		for (p = argv[2]; *p != '\0'; p++) {
			switch (*p) {
			case 'E': /* expand pattern */
				pat = gmk_expand(argv[0]);
				break;
			default: /* not match-specific option */
				co |= parse_comp_opt(*p, name);
				break;
			}
		}
	}

	if (pat == NULL) { /* compile unexpanded pattern */
		re = pcre_compile(argv[0], co, &err, &erroffset, NULL);
	} else {           /* compile expanded pattern */
		re = pcre_compile(pat, co, &err, &erroffset, NULL);
		gmk_free(pat);
	}
	if (re == NULL) { /* compilation error */
		fprintf(stderr, "%s: %d: %s\n", name, erroffset, err);
		goto end_match;
	}

	/* expand subject string and execute regexp */
	str = gmk_expand(argv[1]);
	ncap = pcre_exec(re, NULL, str, strlen(str), 0, 0, ovec, MAX_CAP*3);
	if ((ncap < 0) && (ncap != PCRE_ERROR_NOMATCH)) { /* error occured */
		fprintf(stderr, "%s: pattern matching error: %d\n",
				name, ncap);
	}

	if (ncap > 0) {
		/* set retstr to matched substring */
		int len = ovec[1] - ovec[0];
		retstr = gmk_alloc(len + 1);
		strncpy(retstr, str + ovec[0], len);
		retstr[len] = '\0';

		/* set named make vars to captured substrings */
		set_named_vars(re, str, ovec, ncap);
	}

	pcre_free(re);

end_match:
	/* set make vars to captured substrings */
	set_vars(str, ovec, ncap);

	if (str != NULL) {
		gmk_free(str);
	}
	return retstr;
}

int pcre_gmk_setup()
{
	/* add function for pattern matching */
	gmk_add_function("pcre_find", (gmk_func_ptr)match, 2, 3,
			GMK_FUNC_NOEXPAND);
	gmk_add_function("m", (gmk_func_ptr)match, 2, 3, GMK_FUNC_NOEXPAND);
	return 1;
}